Maxim MAX1301BEUP, MAX1300 Datasheet

General Description

The MAX1300/MAX1301 multirange, low-power, 16-bit,
successive-approximation, analog-to-digital converters
(ADCs) operate from a single +5V supply and achieve
throughput rates up to 115ksps. A separate digital sup­ply allows digital interfacing with 2.7V to 5.25V systems
using the SPI™-/QSPI™-/MICROWIRE™-compatible
serial interface. Partial power-down mode reduces the
supply current to 1.3mA (typ). Full power-down mode
reduces the power-supply current to 1µA (typ).

The MAX1300 provides eight (single-ended) or four
(true differential) analog input channels. The MAX1301
provides four (single-ended) or two (true differential)
analog input channels. Each analog input channel is
independently software programmable for seven sin­gle-ended input ranges (0 to +6V, -6V to 0, 0 to +12V,

-12V to 0, ±3V, ±6V, and ±12V), and three differential
input ranges (±6V, ±12V, ±24V).

An on-chip +4.096V reference offers a small convenient
ADC solution. The MAX1300/MAX1301 also accept an
external reference voltage between 3.800V and 4.136V.

The MAX1300 is available in a 24-pin TSSOP package
and the MAX1301 is available in a 20-pin TSSOP pack­age. Each device is specified for operation from -40°C
to +85°C.

Applications

Industrial Control Systems

Data-Acquisition Systems

Avionics

Robotics

Features

♦ Software-Programmable Input Range for Each

Channel

♦ Single-Ended Input Ranges

0 to +6V, -6V to 0, 0 to +12V, -12V to 0, ±3V,
±6V, and ±12V

♦ Differential Input Ranges

±6V, ±12V, and ±24V

♦ Eight Single-Ended or Four Differential Analog

Inputs (MAX1300)

♦ Four Single-Ended or Two Differential Analog

Inputs (MAX1301)

♦ ±16.5V Overvoltage Tolerant Inputs

♦ Internal or External Reference

♦ 115ksps Maximum Sample Rate

♦ Single +5V Power Supply

♦ 20-/24-Pin TSSOP Package

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,

Serial 16-Bit ADCs

________________________________________________________________ Maxim Integrated Products 1

Pin Configurations

Ordering Information

24

23

22

21

20

19

18

17

1

2

3

4

5

6

7

8

AGND1

AGND2

AV

DD2

AGND3CH2

CH1

CH0

AV

DD1

TOP VIEW

REF

REFCAP

DV

DD

DV

DDO

CH6

CH5

CH4

CH3

16

15

14

13

9

10

11

12

DGND

DGNDO

DOUT

SCLKSSTRB

DIN

CS

CH7

TSSOP

MAX1300

19-3575; Rev 1; 11/06

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.

Pin Configurations continued at end of data sheet.

*Future product—contact factory for availability.

PART

MAX1300AEUG*

MAX1300BEUG*

MAX1301AEUP*

MAX1301BEUP

TEMP

RANGE

-40°C to
+85°C

-40°C to
+85°C

-40°C to
+85°C

-40°C to
+85°C

PIN­PACKAGE

C H A N N EL S

CODE

24 TSSOP 8 U24-1

24 TSSOP 8 U24-1

20 TSSOP 4 U20-2

20 TSSOP 4 U20-2

PKG

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,
Serial 16-Bit ADCs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(AV

DD1

= AV

DD2

= DVDD= DV

DDO

= 5V, AGND1 = DGND = DGNDO = AGND2 = AGND3 = 0, f

CLK

= 3.5MHz (50% duty cycle),

external clock mode, V

REF

= 4.096V (external reference operation), REFCAP = AV

DD1

, maximum single-ended bipolar input range

(±12V), C

DOUT

= 50pF, C

SSTRB

= 50pF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

AV

DD1

to AGND1 ....................................................-0.3V to +6V

AV

DD2

to AGND2 ....................................................-0.3V to +6V

DVDDto DGND ........................................................-0.3V to +6V

DV

DDO

to DGNDO ..................................................-0.3V to +6V

DVDDto DV

DDO

......................................................-0.3V to +6V

DVDD, DV

DDO

to AV

DD1

........................................-0.3V to +6V

AV

DD1

, DVDD, DV

DDO

to AV

DD2

..........................-0.3V to +6V

DGND, DGNDO, AGND3, AGND2 to AGND1 ......-0.3V to +0.3V

CS, SCLK, DIN, DOUT, SSTRB to

DGNDO ............................................-0.3V to (DV

DDO

+ 0.3V)

CH0–CH7 to AGND1 .........................................-16.5V to +16.5V

REF, REFCAP to AGND1.......................-0.3V to (AV

DD1

+ 0.3V)

Continuous Current (any pin) ...........................................±50mA

Continuous Power Dissipation (T

A

= +70°C)

20-Pin TSSOP (derate 11mW/°C above +70°C) ..........879mW

24-Pin TSSOP (derate 12.2mW/°C above +70°C) .......976mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature .....................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

DC ACCURACY (Notes 1, 2)

Resolution 16 Bits

Integral Nonlinearity INL

Differential Nonlinearity DNL No missing codes -1 +2 LSB

Transition Noise External or internal reference 1 LSB

Offset Error

Channel-to-Channel Gain
Matching

Channel-to-Channel Offset Error
Matching

Offset Temperature Coefficient

Gain Error

Gain Temperature Coefficient

Unipolar Endpoint Overlap

DYNAMIC SPECIFICATIONS f

Signal-to-Noise Plus Distortion SINAD

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

MAX130_A ±1.0 ±2

MAX130_B ±1.0 ±4

Single-ended inputs

Differential inputs
(Note 3)

Unipolar or bipolar 0.025 %FSR

Unipolar or bipolar 1.0 mV

Unipolar 10

Bipolar 5

Unipolar ±0.5

Bipolar ±0.3

Unipolar 1.5

Bipolar 1.0

Negative unipolar full scale to positive
unipolar zero-scale

IN(SINE-WAVE)

= 5kHz, VIN = FSR - 0.05dB, f

Differential inputs, FSR = 48V 91

Single-ended inputs, FSR = 24V 89

Single-ended inputs, FSR = 12V 86

Single-ended inputs, FSR = 6V 80 83

Unipolar 0 ±20

Bipolar -1.0 ±10

Unipolar 0 ±40

Bipolar -2.0 ±20

= 130ksps (Notes 1, 2)

SAMPLE

0 20 LSB

LSB

RMS

mV

ppm/°C

%FSR

ppm/°C

dB

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,

Serial 16-Bit ADCs

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(AV

DD1

= AV

DD2

= DVDD= DV

DDO

= 5V, AGND1 = DGND = DGNDO = AGND2 = AGND3 = 0, f

CLK

= 3.5MHz (50% duty cycle),

external clock mode, V

REF

= 4.096V (external reference operation), REFCAP = AV

DD1

, maximum single-ended bipolar input range

(±12V), C

DOUT

= 50pF, C

SSTRB

= 50pF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)

Signal-to-Noise Ratio SNR

Total Harmonic Distortion
(Up to the 5th Harmonic)

Spurious-Free Dynamic Range SFDR 92 99 dB

Aperture Delay t

Aperture Jitter t

Channel-to-Channel Isolation 105 dB

CONVERSION RATE

ANALOG INPUTS (CH0–CH3 MAX1301, CH0–CH7 MAX1300, AGND1)

Small-Signal Bandwidth All input ranges, VIN = 100mV

Full-Power Bandwidth All input ranges, VIN = 4V

Input Voltage Range (Table 6) V

Tr ue- D i ffer enti al Anal og C om m on-
M od e V ol tag e Rang e

Common-Mode Rejection Ratio CMRR DIF/SGL = 1, input voltage range = ±3V 75 dB

Input Current I

Input Capacitance C

Input Resistance R

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Differential inputs, FSR = 48V 91

Single-ended inputs, FSR = 24V 89

Single-ended inputs, FSR = 12V 86

Single-ended inputs, FSR = 6V 83

THD -97 dB

AD

AJ

SAMPLE

CH_

V

CMDR

CH_

CH_

CH_

Figure 21 15 ns

Figure 21 100 ps

External clock mode, Figure 2 114

External acquisition mode, Figure 3 84Byte-Wide Throughput Rate f

Internal clock mode, Figure 4 106

(Note 2) 700 kHz

P-P

R[2:1] = 001 -3 +3

R[2:1] = 010 -6 0

R[2:1] = 011 0 +6

R[2:1] = 100 -6 +6

R[2:1] = 101 -12 0

R[2:1] = 110 0 +12

R[2:1] = 111 -12 +12

DIF/SGL = 1 (Note 4) -14 +9 V

-12V < V

< +12V -1250 +900 µA

CH_

(Note 2) 2 MHz

P-P

5pF

17 kΩ

dB

ksps

V

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,
Serial 16-Bit ADCs

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(AV

DD1

= AV

DD2

= DVDD= DV

DDO

= 5V, AGND1 = DGND = DGNDO = AGND2 = AGND3 = 0, f

CLK

= 3.5MHz (50% duty cycle),

external clock mode, V

REF

= 4.096V (external reference operation), REFCAP = AV

DD1

, maximum single-ended bipolar input range

(±12V), C

DOUT

= 50pF, C

SSTRB

= 50pF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

INTERNAL REFERENCE (Bypass REFCAP with 0.1µF to AGND1 and REF with 1.0µF to AGND1)

Reference Output Voltage V

Reference Temperature
Coefficient

Reference Short-Circuit Current I

Reference Load Regulation I

REF

TC

REF

REFSC

REF shorted to AGND1 10

REF shorted to AV

= 0 to 0.5mA 0.1 10 mV

REF

DD

EXTERNAL REFERENCE (REFCAP = AVDD)

Reference Input Voltage Range V

REFCAP Buffer Disable
Threshold

Reference Input Current I

V

REF

RCTH

REF

(Note 5)

V

= +4.096V, external clock mode,

REF

external acquisition mode, internal clock
mode, or partial power-down mode

V

= +4.096V, full power-down mode ±0.1 ±10

REF

External clock mode, external acquisition

Reference Input Resistance R

REF

mode, internal clock mode, or partial
power-down mode

Full power-down mode 40 MΩ

DIGITAL INPUTS (DIN, SCLK, CS)

Input High Voltage V

Input Low Voltage V

Input Hysteresis V

Input Leakage Current I

Input Capacitance C

IH

IL

HYST

IN

IN

VIN = 0 to DV

DDO

DIGITAL OUTPUTS (DOUT, SSTRB)

DV

Output Low Voltage V

Output High Voltage V

DOUT Tri-State Leakage Current I

POWER REQUIREMENTS (AV

and AGND1, AV

DD1

Analog Supply Voltage AV

Digital Supply Voltage DV

OL

OH

DDO

DD1

DD

= 4.75V, I

DDO

DV

= 2.7V, I

DDO

I

SOURCE

CS = DV

= 0.5mA

DDO

and AGND2, DVDD and DGND, DV

DD2

= 10mA 0.4

SINK

= 5mA 0.4

SINK

DDO

4.056 4.096 4.136 V

±30 ppm/°C

-1

3.800 4.136 V

AV

- 0.4

DD1

AV

DD1

- 0.1

90 200

20 45 kΩ

0.7 x

DV

DDO

0.3 x

DV

DDO

0.2 V

-10 +10 µA

10 pF

DV

DDO

- 0.4

-10 +10 µA

and DGNDO)

4.75 5.25 V

4.75 5.25 V

mA

V

µA

V

V

V

V

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,

Serial 16-Bit ADCs

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

(AV

DD1

= AV

DD2

= DVDD= DV

DDO

= 5V, AGND1 = DGND = DGNDO = AGND2 = AGND3 = 0, f

CLK

= 3.5MHz (50% duty cycle),

external clock mode, V

REF

= 4.096V (external reference operation), REFCAP = AV

DD1

, maximum single-ended bipolar input range

(±12V), C

DOUT

= 50pF, C

SSTRB

= 50pF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)

Preamplifier Supply Voltage AV

Digital I/O Supply Voltage DV

AV

Supply Current I

DD1

DVDD Supply Current I

AV

Supply Current I

DD2

DV

Supply Current I

DDO

Total Supply Current

Power-Supply Rejection Ratio PSRR All analog input ranges ±0.5 LSB

TIMING CHARACTERISTICS (Figures 15 and 16)

SCLK Period t

SCLK Low Pulse Width (Note 6) t

DIN to SCLK Setup t

DIN to SCLK Hold t

SCLK Fall to DOUT Valid t
CS Fall to DOUT Enable t

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DD2

DDO

AVDD1

DVDD

AVDD2

DVDDO

CP

CH

CL

DS

DH

DO

DV

External clock mode,
external acquisition
mode, or internal
clock mode

External clock mode, external acquisition
mode, or internal clock mode

External clock mode, external acquisition
mode, or internal clock mode

External clock mode, external acquisition
mode, or internal clock mode

Partial power-down mode 1.3 mA

Full power-down mode 1 µA

External clock mode 272 62

External acquisition mode 228 62

Internal clock mode 100 83

External clock mode 109

External acquisition mode 92SCLK High Pulse Width (Note 6) t

Internal clock mode 40

External clock mode 109

External acquisition mode 92

Internal clock mode 40

Internal reference 3 3.5

External reference 2.5 3

4.75 5.25 V

2.70 5.25 V

0.9 2 mA

17.5 25 mA

0.2 1 mA

40 ns

0ns

40 ns

40 ns

mA

µs

ns

ns

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,
Serial 16-Bit ADCs

6 _______________________________________________________________________________________

Note 1: Parameter tested at AV

DD1

= AV

DD2

= DVDD= DV

DDO

= 5V.

Note 2: See definitions in the Parameter Definitions section at the end of the data sheet.
Note 3: Guaranteed by correlation with single-ended measurements.
Note 4: Not production tested. Guaranteed by design.
Note 5: To ensure external reference operation, V

REFCAP

must exceed (AV

DD1

- 0.1V). To ensure internal reference operation, V

REFCAP

must be below (AV

DD1

- 0.4V). Bypassing REFCAP with a 0.1µF or larger capacitor to AGND1 sets V

REFCAP

≈ 4.096V. The tran-

sition point between internal reference mode and external reference mode lies between the REFCAP buffer disable threshold
minimum and maximum values (Figures 17 and 18).

Note 6: The SCLK duty cycle can vary between 40% and 60%, as long as the t

CL

and tCHtiming requirements are met.

ANALOG SUPPLY CURRENT

vs. ANALOG SUPPLY VOLTAGE

MAX1300/01 toc01

AV

DD1

(V)

I

AVDD1

(mA)

5.155.054.954.85

2.35

2.40

2.45

2.50

2.55

2.60

2.30

4.75 5.25

+85°C

+25°C

-40°C

EXTERNAL CLOCK MODE

PREAMPLIFIER SUPPLY CURRENT

vs. PREAMPLIFIER SUPPLY VOLTAGE

MAX1300/01 toc02

AV

DD2

(V)

I

AVDD2

(mA)

5.155.054.85 4.95

16

17

18

19

20

21

22

23

24

15

4.75 5.25

+85°C

+25°C

-40°C

EXTERNAL CLOCK MODE

DIGITAL SUPPLY CURRENT

vs. DIGITAL SUPPLY VOLTAGE

MAX1300/01 toc03

DVDD (V)

I

DVDD

(mA)

5.155.054.954.85

0.70

0.75

0.80

0.85

0.90

0.65

4.75 5.25

+85°C

+25°C

-40°C

EXTERNAL CLOCK MODE

Typical Operating Characteristics

(AV

DD1

= AV

DD2

= DVDD= DV

DDO

= 5V, AGND1 = DGND = DGNDO = AGND2 = AGND3 = 0, f

CLK

= 3.5MHz (50% duty cycle),

external clock mode, V

REF

= 4.096V (external reference operation), REFCAP = AV

DD1

, maximum single-ended bipolar input range,

C

DOUT

= 50pF, C

SSTRB

= 50pF; unless otherwise noted.)

ELECTRICAL CHARACTERISTICS (continued)

(AV

DD1

= AV

DD2

= DVDD= DV

DDO

= 5V, AGND1 = DGND = DGNDO = AGND2 = AGND3 = 0, f

CLK

= 3.5MHz (50% duty cycle),

external clock mode, V

REF

= 4.096V (external reference operation), REFCAP = AV

DD1

, maximum single-ended bipolar input range

(±12V), C

DOUT

= 50pF, C

SSTRB

= 50pF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CS Rise to DOUT Disable t
CS Fall to SCLK Rise Setup t
CS High Minimum Pulse Width t

SCLK Fall to CS Rise Hold t

TR

CSS

CSPW

CSH

40 ns

40 ns

0ns

40 ns

SSTRB Rise to CS Fall Setup (Note 4) 40 ns

DOUT Rise/Fall Time CL = 50pF 10 ns

SSTRB Rise/Fall Time CL = 50pF 10 ns

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,

Serial 16-Bit ADCs

_______________________________________________________________________________________ 7

I

(

A)

Typical Operating Characteristics (continued)

(AV

DD1

= AV

DD2

= DVDD= DV

DDO

= 5V, AGND1 = DGND = DGNDO = AGND2 = AGND3 = 0, f

CLK

= 3.5MHz (50% duty cycle),

external clock mode, V

REF

= 4.096V (external reference operation), REFCAP = AV

DD1

, maximum single-ended bipolar input range,

C

DOUT

= 50pF, C

SSTRB

= 50pF; unless otherwise noted.)

0.28

0.26

0.24

0.22

0.20

(mA)

0.18

DVDDO

I

0.16

0.14

0.12

0.10

0.20

0.18

0.16

(mA)

AVDD2

I

0.14

0.12

0.10

DIGITAL I/O SUPPLY CURRENT

vs. DIGITAL I/O SUPPLY VOLTAGE

EXTERNAL CLOCK MODE

MAX1300/01 toc04

+85°C

+25°C

-40°C

4.75 5.25
DV

DDO

PREAMPLIFIER SUPPLY CURRENT

vs. PREAMPLIFIER SUPPLY VOLTAGE

PARTIAL POWER-DOWN MODE

+25°C

-40°C

4.75 5.25
AV

DD2

5.155.054.85 4.95

(V)

+85°C

MAX1300/01 toc06

5.155.054.954.85

(V)

ANALOG SUPPLY CURRENT

vs. ANALOG SUPPLY VOLTAGE

0.55
PARTIAL POWER-DOWN MODE

0.53

+85°C

0.51

(mA)

AVDD1

I

0.49

0.47

0.45

4.75 5.25

+25°C

-40°C

AV

(V)

DD1

DIGITAL SUPPLY CURRENT

vs. DIGITAL SUPPLY VOLTAGE

0.136
PARTIAL POWER-DOWN MODE

0.134

0.132

0.130

m

0.128

DVDD

0.126

0.124

0.122

0.120

4.75 5.25

+85°C

-40°C

+25°C

DVDD (V)

MAX1300/01 toc05

5.155.054.954.85

MAX1300/01 toc07

5.154.85 5.054.95

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,
Serial 16-Bit ADCs

8 _______________________________________________________________________________________

Note 7: For partial power-down and full power-down modes, external clock mode was used for a burst of continuous samples.

Partial power-down or full power-down modes were entered thereafter. By using this method, the conversion rate was found
by averaging the number of conversions over the time starting from the first conversion to the end of the partial power-down
or full power-down modes.

Typical Operating Characteristics (continued)

(AV

DD1

= AV

DD2

= DVDD= DV

DDO

= 5V, AGND1 = DGND = DGNDO = AGND2 = AGND3 = 0, f

CLK

= 3.5MHz (50% duty cycle),

external clock mode, V

REF

= 4.096V (external reference operation), REFCAP = AV

DD1

, maximum single-ended bipolar input range,

C

DOUT

= 50pF, C

SSTRB

= 50pF; unless otherwise noted.)

(mA)

AVDD1

I

ANALOG SUPPLY CURRENT

vs. CONVERSION RATE

3.0

EXTERNAL CLOCK MODE

2.5

2.0
PARTIAL
POWER-DOWN MODE

1.5

1.0

0.5

FULL
POWER-DOWN MODE

MAX1300/01 toc08

PREAMPLIFIER SUPPLY CURRENT

vs. CONVERSION RATE

25

f

= 7.5MHz (NOTE 7)

CLK

20

EXTERNAL CLOCK MODE

FULL POWER-DOWN MODE,

15

PARTIAL POWER-DOWN MODE

(mA)

AVDD2

I

10

5

MAX1300/01 toc09

0

0

CONVERSION RATE (ksps)

DIGITAL SUPPLY CURRENT

vs. CONVERSION RATE

1.8
f

= 7.5MHz (NOTE 7)

CLK

1.6

1.4

EXTERNAL CLOCK MODE,

1.2

PARTIAL POWER-DOWN MODE

1.0

(mA)

0.8

DVDD

I

0.6

0.4

0.2

0

0

FULL POWER-DOWN MODE

15010050

CONVERSION RATE (ksps)

20015010050

MAX1300/01 toc10

200

(mA)

DVDDO

I

0

CONVERSION RATE (ksps)

DIGITAL I/O SUPPLY CURRENT

vs. CONVERSION RATE

0.6
f

= 7.5MHz (NOTE 7)

CLK

0.5

0.4

0.3

0.2

0.1

0

0

EXTERNAL CLOCK MODE

FULL POWER-DOWN MODE,
PARTIAL POWER-DOWN MODE

CONVERSION RATE (ksps)

150100500

200

MAX1300/01 toc11

20015010050

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,

Serial 16-Bit ADCs

_______________________________________________________________________________________ 9

Typical Operating Characteristics (continued)

(AV

DD1

= AV

DD2

= DVDD= DV

DDO

= 5V, AGND1 = DGND = DGNDO = AGND2 = AGND3 = 0, f

CLK

= 3.5MHz (50% duty cycle),

external clock mode, V

REF

= 4.096V (external reference operation), REFCAP = AV

DD1

, maximum single-ended bipolar input range,

C

DOUT

= 50pF, C

SSTRB

= 50pF; unless otherwise noted.)

EXTERNAL REFERENCE INPUT CURRENT

vs. EXTERNAL REFERENCE INPUT VOLTAGE

0.16
ALL MODES

0.15

0.14

0.13

EXTERNAL REFERENCE CURRENT (mA)

0.12

3.80 4.15
EXTERNAL REFERENCE VOLTAGE (V)

CHANNEL-TO-CHANNEL ISOLATION

vs. INPUT FREQUENCY

0

f

= 115ksps

SAMPLE

±

12V BIPOLAR RANGE

-20
CH0 TO CH2

-40

-60

ISOLATION (dB)

-80

-100

-120
1 10,000

FREQUENCY (kHz)

2.0
f

±

1.5

1.0

0.5

0

DNL (LSB)

-0.5

-1.0

-1.5

-2.0
0 65,535

GAIN DRIFT vs. TEMPERATURE

0.10

0.08

0.06

MAX1300/01 toc12

0.04

±

0.02

-0.02

GAIN ERROR (%FSR)

-0.04

-0.06

-0.08

MAX1300/01 toc15

CMRR (dB)

-0.10

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

4.104.054.003.953.903.85

100010010

DIFFERENTIAL NONLINEARITY

vs. DIGITAL OUTPUT CODE

= 115ksps

SAMPLE

12V BIPOLAR RANGE

DIGITAL OUTPUT CODE

0

-40 85

COMMON-MODE REJECTION RATIO

0

f

SAMPLE

±

12V BIPOLAR RANGE

1 10,000

52,42839,32113,107 26,214

12V BIPOLAR RANGE

±

3V BIPOLAR RANGE

TEMPERATURE (°C)

vs. FREQUENCY

= 115ksps

FREQUENCY (kHz)

MAX1300/01 toc18

603510-15

100010010

0

-20

-40

-60

-80

MAGNITUDE (dB)

-100

-120

-140
0

OFFSET DRIFT vs. TEMPERATURE

1.0

0.8

0.6

MAX1300/01 toc13

0.4

0.2

0

-0.2

OFFSET ERROR (mV)

-0.4

-0.6

-0.8

-1.0

±

3V BIPOLAR RANGE

±

12V BIPOLAR RANGE

-40 85
TEMPERATURE (°C)

INTEGRAL NONLINEARITY

vs. DIGITAL OUTPUT CODE

2.0
f

= 115ksps

SAMPLE

±

12V BIPOLAR RANGE

1.5

MAX1300/01 toc16

1.0

0.5

0

INL (LSB)

-0.5

-1.0

-1.5

-2.0
0 65,535

DIGITAL OUTPUT CODE

FFT AT 5kHz

f

= 115ksps

SAMPLE

f

IN(SINE WAVE)

±12V BIPOLAR RANGE

FREQUENCY (kHz)

= 5kHz

MAX1300/01 toc19

5040302010

MAX1300/01 toc14

603510-15

MAX1300/01 toc17

52,42839,32113,107 26,214

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,
Serial 16-Bit ADCs

10 ______________________________________________________________________________________

Typical Operating Characteristics (continued)

(AV

DD1

= AV

DD2

= DVDD= DV

DDO

= 5V, AGND1 = DGND = DGNDO = AGND2 = AGND3 = 0, f

CLK

= 3.5MHz (50% duty cycle),

external clock mode, V

REF

= 4.096V (external reference operation), REFCAP = AV

DD1

, maximum single-ended bipolar input range,

C

DOUT

= 50pF, C

SSTRB

= 50pF; unless otherwise noted.)

100

90

80

70

60

50

40

SNR, SINAD (dB)

30

20

10

-20

-40

SNR, SINAD, ENOB

vs. ANALOG INPUT FREQUENCY

SINAD

ENOB

0

1 1000

FREQUENCY (kHz)

MAX1300/01 toc20

SNR

f

= 115ksps

SAMPLE

±12V BIPOLAR RANGE

10010

16

15

14

13

12

11

10

9

8

7

6

ENOB (BITS)

-SFDR, THD vs. SAMPLE RATE

0

f

IN(SINE WAVE)

±12V BIPOLAR RANGE

= 5kHz

MAX1300/01 toc22

SNR, SINAD, ENOB vs. SAMPLE RATE

100

80

60

40

SNR, SINAD (dB)

20

0

SNR, SINAD

ENOB

0.1 1000
SAMPLE RATE (ksps)

-SFDR, THD

vs. ANALOG INPUT FREQUENCY

0

f

= 115ksps

SAMPLE

±12V BIPOLAR RANGE

-20

-40

MAX1300/01 toc21

f

IN(SINE WAVE)

±12V BIPOLAR RANGE

= 5kHz

100101

16

14

12

10

8

6

MAX1300/01 toc23

ENOB (BITS)

-60

-SFDR, THD (dB)

-80

-100

-120

0.1 1000

THD

-SFDR

SAMPLE RATE (ksps)

100101

-60

-SFDR, THD (dB)

-80
THD

-100

-120
1 1000

-SFDR

10010

FREQUENCY (kHz)

ANALOG INPUT CURRENT

1.0

vs. ANALOG INPUT VOLTAGE

ALL MODES

0.6

0.2

-0.2

ANALOG INPUT CURRENT (mA)

-0.6

-1.0

-12 12
ANALOG INPUT VOLTAGE (V)

MAX1300/01 toc24

9630-3-6-9

-10

-15

-20

-25

ATTENUATION (dB)

-30

-35

-40

-45

SMALL-SIGNAL BANDWIDTH

0

-5

1 10,000

FREQUENCY (kHz)

100010010

MAX1300/01 toc25

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,

Serial 16-Bit ADCs

______________________________________________________________________________________ 11

Typical Operating Characteristics (continued)

(AV

DD1

= AV

DD2

= DVDD= DV

DDO

= 5V, AGND1 = DGND = DGNDO = AGND2 = AGND3 = 0, f

CLK

= 3.5MHz (50% duty cycle),

external clock mode, V

REF

= 4.096V (external reference operation), REFCAP = AV

DD1

, maximum single-ended bipolar input range,

C

DOUT

= 50pF, C

SSTRB

= 50pF; unless otherwise noted.)

REFERENCE VOLTAGE vs. TIME

MAX1300/01 toc27

1V/div

0V

4ms/div

ATTENUATION (dB)

35,000

30,000

25,000

20,000

15,000

NUMBER OF HITS

10,000

5,000

FULL-POWER BANDWIDTH

0

-5

-10

-15

-20

-25

-30

-35

-40

-45
1 10,000

FREQUENCY (kHz)

100010010

NOISE HISTOGRAM

(CODE EDGE)

65,534 SAMPLES

0

32,785 32,789

32,787

32,786 32,788 32,790

CODE

MAX1300/01 toc26

MAX1300/01 toc28

40,000

65,534 SAMPLES

35,000

30,000

25,000

20,000

15,000

NUMBER OF HITS

10,000

5,000

0

NOISE HISTOGRAM

(CODE CENTER)

MAX1300/01 toc29

32,77732,775

CODE

32,778

32,779

32,78032,774

32,776

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,
Serial 16-Bit ADCs

12 ______________________________________________________________________________________

Pin Description

PIN

MAX1300 MAX1301

12AV

2 3 CH0 Analog Input Channel 0

3 4 CH1 Analog Input Channel 1

4 5 CH2 Analog Input Channel 2

5 6 CH3 Analog Input Channel 3

6 — CH4 Analog Input Channel 4

7 — CH5 Analog Input Channel 5

8 — CH6 Analog Input Channel 6

9 — CH7 Analog Input Channel 7

10 7 CS

11 8 DIN

12 9 SSTRB

13 10 SCLK

14 11 DOUT

15 12 DGNDO Digital I/O Ground. DGND, DGNDO, AGND3, AGND2, and AGND1 must be connected together.

16 13 DGND Digital Ground. DGND, DGNDO, AGND3, AGND2, and AGND1 must be connected together.

17 14 DV

18 15 DV

19 16 REFCAP

NAME FUNCTION

Analog Supply Voltage 1. Connect AV

DD1

DDO

DD

to AGND1 with a 0.1µF capacitor.

AV

DD1

Active-Low Chip-Select Input. When CS is low, data is clocked into the device from DIN on the
rising edge of SCLK. With CS low, data is clocked out of DOUT on the falling edge of SCLK.
When CS is high, activity on SCLK and DIN is ignored and DOUT is high impedance.

Serial Data Input. When CS is low, data is clocked in on the rising edge of SCLK. When CS is
high, transitions on DIN are ignored.

Serial-Strobe Output. When using the internal clock, SSTRB rising edge transitions indicate that
data is ready to be read from the device. When operating in external clock mode, SSTRB is
always low. SSTRB does not tri-state, regardless of the state of CS, and therefore requires
a dedicated I/O line.

Serial Clock Input. When CS is low, transitions on SCLK clock data into DIN and out of DOUT.
When CS is high, transitions on SCLK are ignored.

Serial Data Output. When CS is low, data is clocked out of DOUT with each falling SCLK
transition. When CS is high, DOUT is high impedance.

Digital I/O Supply Voltage Input. Connect DV
Bypass DV

Digital-Supply Voltage Input. Connect DVDD to a +4.75V to +5.25V power-supply voltage.
Bypass DV

Bandgap-Voltage Bypass Node. For external reference operation, connect REFCAP to AV
For internal reference operation, bypass REFCAP with a 0.01µF capacitor to AGND1
(V

REFCAP

DDO

DD

≈ 4.096V).

to a +4.75V to +5.25V power-supply voltage. Bypass

DD1

to DGNDO with a 0.1µF capacitor.

to DGND with a 0.1µF capacitor.

DDO

to a +2.7V to +5.25V power-supply voltage.

DD

.

Reference-Buffer Output/ADC Reference Input. For external reference operation, apply an

20 17 REF

external reference voltage from 3.800V to 4.136V to REF. For internal reference operation,
bypassing REF with a 1µF capacitor to AGND1 sets V

= 4.096V ±1%.

REF

Detailed Description

The MAX1300/MAX1301 multirange, low-power, 16-bit
successive-approximation ADCs operate from a single
+5V supply and have a separate digital supply allowing
digital interface with 2.7V to 5.25V systems. These 16-bit
ADCs have internal track-and-hold (T/H) circuitry that
supports single-ended and fully differential inputs. For
single-ended conversions, the valid analog input voltage
range spans from -12V below ground to +12V above
ground. The maximum allowable differential input volt­age spans from -24V to +24V. Data can be converted in
a variety of software-programmable channel and data­acquisition configurations. Microprocessor (µP) control is
made easy through an SPI-/QSPI-/MICROWIRE-compati­ble serial interface.

The MAX1300 has eight single-ended analog input
channels or four differential channels (see the Block
Diagram at the end of the data sheet). The MAX1301
has four single-ended analog input channels or two dif­ferential channels. Each analog input channel is inde­pendently software programmable for seven
single-ended input ranges (0 to +6V, -6V to 0, 0 to
+12V, -12V to 0, ±3V, ±6V, and ±12V) and three differ­ential input ranges (±6V, ±12V, and ±24V).
Additionally, all analog input channels are fault tolerant
to ±16.5V. A fault condition on an idle channel does not
affect the conversion result of other channels.

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,

Serial 16-Bit ADCs

______________________________________________________________________________________ 13

Pin Description (continued)

Figure 1. Typical Application Circuit

PIN

MAX1300 MAX1301

21 18 AGND3

22 19 AV

23 20 AGND2

24 1 AGND1 Analog Ground 1. DGND, DGNDO, AGND3, AGND2, and AGND1 must be connected together.

NAME FUNCTION

Analog Signal Ground 3. AGND3 is the ADC negative reference potential. Connect AGND3 to
AGND1. DGND, DGNDO, AGND3, AGND2, and AGND1 must be connected together.

Analog Supply Voltage 2. Connect AV

DD2

to AGND2 with a 0.1µF capacitor.

AV

DD2

to a +4.75V to +5.25V power-supply voltage. Bypass

DD2

Analog Ground 2. This ground carries approximately five times more current than AGND1.
DGND, DGNDO, AGND3, AGND2, and AGND1 must be connected together.

5.0V 5.0V 5.0V

0.1µF 0.1µF 0.1µF

ACCELERATION

1µF

4–20mA

PLC

PRESSURE

TEMPERATURE

WHEATESTONE

WHEATESTONE

0.1µF

AV

CHO

CH1

CH2

CH3

CH4

CH5

CH6

CH7

REF

AGND1

REFCAP

AGND2

DD2

AV

DD1

MAX1300

DGNDOAGND3 DGND

DV

DD

DV

SCLK

SSTRB

DOUT

3.3V

DDO

0.1µF

CS

DIN

V

DD

MC68HCXX

µC

SCK

I/O

MOSI

I/O

MISO

V

SS

MAX1300/MAX1301

Power Supplies

To maintain a low-noise environment, the MAX1300 and
MAX1301 provide separate power supplies for each
section of circuitry. Table 1 shows the four separate
power supplies. Achieve optimal performance using
separate AV

DD1

, AV

DD2

, DVDD, and DV

DDO

supplies.

Alternatively, connect AV

DD1

, AV

DD2

, and DV

DD

together as close to the device as possible for a conve­nient power connection. Connect AGND1, AGND2,
AGND3, DGND, and DGNDO together as close to the
device as possible. Bypass each supply to the corre­sponding ground using a 0.1µF capacitor (Table 1). If
significant low-frequency noise is present, add a 10µF
capacitor in parallel with the 0.1µF bypass capacitor.

Converter Operation

The MAX1300/MAX1301 ADCs feature a fully differen­tial, successive-approximation register (SAR) conver­sion technique and an on-chip T/H block to convert
voltage signals into a 16-bit digital result. Both single­ended and differential configurations are supported
with programmable unipolar and bipolar signal ranges.

Track-and-Hold Circuitry

The MAX1300/MAX1301 feature a switched-capacitor
T/H architecture that allows the analog input signal to be
stored as charge on sampling capacitors. See Figures 2,
3, and 4 for T/H timing and the sampling instants for
each operating mode. The MAX1300/MAX1301 analog
input circuitry buffers the input signal from the sampling
capacitors, resulting in a constant input impedance with
varying input voltage (Figure 5).

Analog Input Circuitry

Select differential or single-ended conversions using the
associated analog input configuration byte (Table 2).
The analog input signal source must be capable of dri­ving the ADC’s 17kΩ input resistance (Figure 6).

Figure 6 shows the simplified analog input circuit. The
analog inputs are ±16.5V fault tolerant and are protected
by back-to-back diodes. The summing junction voltage,
VSJ, is a function of the channel’s input common­mode voltage:

As a result, the analog input impedance is relatively con­stant over input voltage as shown in Figure 5.

8-/4-Channel, ±12V Multirange Inputs,
Serial 16-Bit ADCs

14 ______________________________________________________________________________________

Table 1. MAX1300/MAX1301 Power Supplies and Bypassing

Table 2. Analog Input Configuration Byte

V

⎛
⎜

SJ CM

⎝

POWER

SUPPLY/GROUND

DV

/DGNDO 2.7 to 5.25 0.2 Digital I/O 0.1µF to DGNDO

DDO

AV

/AGND2 4.75 to 5.25 17.5 Analog Circuitry 0.1µF to AGND2

DD2

AV

/AGND1 4.75 to 5.25 3.0 Analog Circuitry 0.1µF to AGND1

DD1

DVDD/DGND 4.75 to 5.25 0.9 Digital Control Logic and Memory 0.1µF to DGND

SUPPLY VOLTAGE

RANGE (V)

TYPICAL SUPPLY

CURRENT (mA)

R

1

⎞

.

×++

2 375 1

⎟
⎠

+

RR

12

CIRCUIT SECTION BYPASSING

⎛
⎜

⎝

⎛
⎜

⎝

RR

12

V

R

1

+

⎞

⎞

=

⎟

⎟

⎠

⎠

V

×

BIT

NUMBER

7 START Start Bit. The first logic 1 after CS goes low defines the beginning of the analog input configuration byte.

6C2

5C1

4C0

3 DIF/SGL

2R2

1R1

0R0

NAME DESCRIPTION

Channel-Select Bits. SEL[2:0] select the analog input channel to be configured (Tables 4 and 5).

Differential or Single-Ended Configuration Bit. DIF/SGL = 0 configures the selected analog input channel
for single-ended operation. DIF/SGL = 1 configures the channel for differential operation. In single-ended
mode, input voltages are measured between the selected input channel and AGND1, as shown in
Table 4. In differential mode, the input voltages are measured between two input channels, as shown in
Table 5. Be aware that changing DIF/SGL adjusts the FSR, as shown in Table 6.

Input-Range-Select Bits. R[2:0] select the input voltage range, as shown in Table 6 and Figure 7.

Single-ended conversions are internally referenced to
AGND1 (Tables 3 and 4). In differential mode, IN+ and
IN- are selected according to Tables 3 and 5. When con­figuring differential channels, the differential pair follows
the analog configuration byte for the positive channel.
For example, to configure CH2 and CH3 for a ±12V dif­ferential conversion, set the CH2 analog configuration
byte for a differential conversion with the ±12V range
(1010 1100). To initiate a conversion for the CH2 and
CH3 differential pair, issue the command 1010 0000.

Analog Input Bandwidth

The MAX1300/MAX1301 input-tracking circuitry has a
2MHz small-signal bandwidth. The 2MHz input band­width makes it possible to digitize high-speed transient
events. Harmonic distortion increases when digitizing
signal frequencies above 15kHz as shown in the THD
and -SFDR vs. Input Frequency plot in the Typical
Operating Characteristics.

Analog Input Range and Fault Tolerance

Figure 7 illustrates the software-selectable single-ended
analog input voltage range that produces a valid digital
output. Each analog input channel can be independently
programmed to one of seven single-ended input ranges
by setting the R[2:0] control bits with DIF/SGL = 0.

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,

Serial 16-Bit ADCs

______________________________________________________________________________________ 15

Figure 2. External Clock-Mode Conversion (Mode 0)

CS

1

2

3

4

SCLK

SSTRB

DIN S C2 C1 C0 0 0 0 0

ANALOG INPUT

TRACK AND HOLD*

HOLD TRACK HOLD

5

BYTE 1 BYTE 2 BYTE 3 BYTE 4

10

11

12

13

14

15

16

6

7

8

9

f

SAMPLE

t

ACQ

171819

≈ f

/ 32

SCLK

SAMPLING INSTANT

20

21

22

232425

26

27

28

29

303132

HIGH

DOUT

IMPEDANCE

*TRACK AND HOLD TIMING IS CONTROLLED BY SCLK.

B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0

HIGH

IMPEDANCE

MAX1300/MAX1301

Figure 8 illustrates the software-selectable differential
analog input voltage range that produces a valid digital
output. Each analog input differential pair can be inde­pendently programmed to one of three differential input
ranges by setting the R[2:0] control bits with DIF/SGL = 1.

Regardless of the specified input voltage range and
whether the channel is selected, each analog input is
±16.5V fault tolerant. The analog input fault protection
is active whether the device is unpowered or powered.

Any voltage beyond FSR, but within the ±16.5V fault­tolerant range, applied to an analog input results in a
full-scale output voltage for that channel.

Clamping diodes with breakdown thresholds in excess
of 16.5V protect the MAX1300/MAX1301 analog inputs
during ESD and other transient events (Figure 6). The
clamping diodes do not conduct during normal device
operation, nor do they limit the current during such
transients. When operating in an environment with the
potential for high-energy voltage and/or current tran­sients, protect the MAX1300/MAX1301 externally.

8-/4-Channel, ±12V Multirange Inputs,
Serial 16-Bit ADCs

16 ______________________________________________________________________________________

Figure 3. External Acquisition-Mode Conversion (Mode 1)

CS

SSTRB

SCLK

DIN SC2C1C00000

DOUT

123

4

56789

BYTE 1 BYTE 2 BYTE 3 BYTE 4

10111213141516

t

ANALOG INPUT

TRACK AND HOLD*

INTCLK**

HOLD

*TRACK AND HOLD TIMING IS CONTROLLED BY SCLK.
**INTCLK IS AN INTERNAL SIGNAL AND IS NOT ACCESSIBLE TO THE USER.

ACQ

TRACK HOLD

f

SAMPLE

SAMPLING INSTANT

100ns to 400ns

123

171819202122232425262728293031

f

≈ f

INTCLK

SCLK

/ 32 + f

≈ 4.5MHz

HIGH IMPEDANCE

/ 17

INTCLK

141516

B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0

17

32

Figure 6. Simplified Analog Input Circuit

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,

Serial 16-Bit ADCs

______________________________________________________________________________________ 17

SSTRB

Figure 4. Internal Clock-Mode Conversion (Mode 2)

Figure 5. Analog Input Current vs. Input Voltage

CS

SCLK

DOUT

ANALOG INPUT

TRACK AND HOLD*

INTCLK**

1234567

DIN S C2 C1 C0 0 0 0 0

HOLD HOLD

BYTE 1 BYTE 2 BYTE 3

*TRACK AND HOLD TIMING IS CONTROLLED BY INTCLK, AND IS NOT ACCESSIBLE TO THE USER.
**INTCLK IS AN INTERNAL SIGNAL AND IS NOT ACCESSIBLE TO THE USER.

8

t

ACQ

TRACK

100ns to 400ns

123

1.0
ALL MODES

0.6

0.2

-0.2

ANALOG INPUT CURRENT (mA)

-0.6

-1.0

-12 12
ANALOG INPUT VOLTAGE (V)

9630-3-6-9

HIGH IMPEDANCE

f

f

SAMPLE

SAMPLING INSTANT

1011121314

≈ 4.5MHz

INTCLK

10111213141516

9

B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0

≈ f

/ 24 + f

/ 28

SCLK

INTCLK

252627

28

MAX1300

17181920212223

R2

24

MAX1301

*R

SOURCE

ANALOG
SIGNAL
SOURCE

*R

SOURCE

ANALOG
SIGNAL
SOURCE

IN_+

IN_+

R1

V

SJ

R2

R1

V

SJ

*MINIMIZE R

TO AVOID GAIN ERROR AND DISTORTION.

SOURCE

MAX1300/MAX1301

Differential Common-Mode Range

The MAX1300/MAX1301 differential common-mode
range (V

CMDR

) must remain within -14V to +10V to obtain
valid conversion results. The differential common-mode
range is defined as:

In addition to the common-mode input voltage limitations,
each individual analog input must be limited to ±16.5V
with respect to AGND1.

The range-select bits R[2:0] in the analog input config­uration bytes determine the full-scale range for the cor­responding channel (Tables 2 and 6). Figures 9, 10,
and 11 show the valid analog input voltage ranges for
the MAX1300/MAX1301 when operating with FSR =
12V, FSR = 24V, and FSR = 48V, respectively. The
shaded area contains the valid common-mode voltage
ranges that support the entire FSR.

8-/4-Channel, ±12V Multirange Inputs,
Serial 16-Bit ADCs

18 ______________________________________________________________________________________

Table 3. Input Data Word Formats

Table 4. Channel Selection in Single-Ended Mode (DIF/

SSGGLL

= 0)

Table 5. Channel Selection in True-Differential Mode (DIF/

SSGGLL

= 1)

DATA BIT

OPERATION

Conversion-Start Byte

(Tables 4 and 5)

Analog-Input Configuration Byte

(Table 2)

Mode-Control Byte

(Table 7)

D7

(START)

1C2C1C00000

1 C2 C1 C0 DIF/SGL R2 R1 R0

1M2M1M01000

D6 D5 D4 D3 D2 D1 D0

CHANNEL-SELECT BIT CHANNEL

C2 C1 C0 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 AGND1

000+ -

001 + -

010 + -

011 + -

100 + -

101 + -

110 +-

111 +-

CHANNEL-SELECT BIT CHANNEL

C2 C1 C0 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 AGND1

000+-

0 0 1 RESERVED

010 +-

0 1 1 RESERVED

100 +-

1 0 1 RESERVED

110 +-

1 1 1 RESERVED

CH CH

_ _

+

V

CMDR

()

=

+

2

−

()

Digital Interface

The MAX1300/MAX1301 feature a serial interface that is
compatible with SPI/QSPI and MICROWIRE devices.
DIN, DOUT, SCLK, CS, and SSTRB facilitate bidirec­tional communication between the MAX1300/MAX1301
and the master at SCLK rates up to 10MHz (internal
clock mode, mode 2), 3.67MHz (external clock mode,
mode 0), or 4.39MHz (external acquisition mode, mode

1). The master, typically a microcontroller, should use
the CPOL = 0, CPHA = 0, SPI transfer format, as shown
in the timing diagrams of Figures 2, 3, and 4.

The digital interface is used to:

• Select single-ended or true-differential input channel
configurations

• Select the unipolar or bipolar input range

• Select the mode of operation:

External clock (mode 0)
External acquisition (mode 1)
Internal clock (mode 2)
Reset (mode 4)
Partial power-down (mode 6)
Full power-down (mode 7)

• Initiate conversions and read results

Chip Select

(CS)

CS enables communication with the MAX1300/MAX1301.
When CS is low, data is clocked into the device from DIN
on the rising edge of SCLK and data is clocked out of
DOUT on the falling edge of SCLK. When CS is high,
activity on SCLK and DIN is ignored and DOUT is high
impedance allowing DOUT to be shared with other
peripherals. SSTRB is never high impedance and there­fore cannot be shared with other peripherals.

Serial Strobe Output (SSTRB)

As shown in Figures 3 and 4, the SSTRB transitions high
to indicate that the ADC has completed a conversion
and results are ready to be read by the master. SSTRB
remains low in the external clock mode (Figure 2) and
consequently may be left unconnected. SSTRB is driven
high or low regardless of the state of CS, therefore
SSTRB cannot be shared with other peripherals.

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,

Serial 16-Bit ADCs

______________________________________________________________________________________ 19

Figure 7. Single-Ended Input Voltage Ranges

Figure 8. Differential Input Voltage Ranges

+12

+9

+6

FSR = 12V

+3

0

FSR = 6V

(CH_) - AGND1 (V)

-3

-6

-9

-12
001

EACH INPUT IS FAULT TOLERANT TO ±16.5V.
V

= 4.096V.

REF

FSR = 6V

FSR = 12V

FSR = 6V

FSR = 12V

010

011

100

INPUT RANGE SELECTION BITS, R[2:0]

101

110

FSR = 24V

111

+24

+18

+12

+6

0

FSR = 12V

(CH_+) - (CH_-) (V)

-6

-12

-18

-24
001

010

INPUT RANGE SELECTION BITS, R[2:0]

EACH INPUT IS FAULT TOLERANT TO ±16.5V.
V

= 4.096V.

REF

011

FSR = 24V

100

101

110

FSR = 48V

111

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,
Serial 16-Bit ADCs

20 ______________________________________________________________________________________

Table 6. Range-Select Bits

*Conversion-Start Byte (see Table 3).

**Mode-Control Byte (see Table 3).

DIF/SGL R2 R1 R0 MODE TRANSFER FUNCTION

0 0 0 0 No Range Change* —

Single-Ended

0001

0010

0011

0100

0101

Bipolar -3V to +3V
Full-Scale Range (FSR) = 6V

Single-Ended
Unipolar -6V to 0
FSR = 6V

Single-Ended
Unipolar 0 to +6V
FSR = 6V

Single-Ended
Bipolar -6V to +6V
FSR = 12V

Single-Ended
Unipolar -12V to 0
FSR = 12V

Figure 12

Figure 13

Figure 14

Figure 12

Figure 13

Single-Ended

0110

0111

1 0 0 0 No Range Change** —

1001

1 0 1 0 Reserved —

1 0 1 1 Reserved —

1100

1 1 0 1 Reserved —

1 1 1 0 Reserved —

1111

Unipolar 0 to +12V
FSR = 12V

DEFAULT SETTING

Single-Ended
Bipolar -12V to +12V
FSR = 24V

Differential
Bipolar -6V to +6V
FSR = 12V

Differential
Bipolar -12V to +12V
FSR = 24V

Differential
Bipolar -24V to +24V
FSR = 48V

Figure 14

Figure 12

Figure 12

Figure 12

Figure 12

Start Bit

Communication with the MAX1300/MAX1301 is accom­plished using the three input data word formats shown
in Table 3. Each input data word begins with a start bit.
The start bit is defined as the first high bit clocked into
DIN with CS low when any of the following are true:

• Data conversion is not in process and all data from
the previous conversion has clocked out of DOUT.

• The device is configured for operation in external
clock mode (mode 0) and previous conversion-result
bits B15–B3 have clocked out of DOUT.

• The device is configured for operation in external
acquisition mode (mode 1) and previous conversion­result bits B15–B7 have clocked out of DOUT.

• The device is configured for operation in internal
clock mode, (mode 2) and previous conversion­result bits B15–B4 have clocked out of DOUT.

Output Data Format

Output data is clocked out of DOUT in offset binary for­mat on the falling edge of SCLK, MSB first (B15). For
output binary codes, see the Transfer Function section
and Figures 12, 13, and 14.

Configuring Analog Inputs

Each analog input has two configurable parameters:

• Single-ended or true-differential input

• Input voltage range

These parameters are configured using the analog input
configuration byte as shown in Table 2. Each analog
input has a dedicated register to store its input configura­tion information. The timing diagram of Figure 15 shows
how to write to the analog input configuration registers.
Figure 16 shows DOUT and SSTRB timing.

Transfer Function

An ADC’s transfer function defines the relationship
between the analog input voltage and the digital output
code. Figures 12, 13, and 14 show the MAX1300/
MAX1301 transfer functions. The transfer function is
determined by the following characteristics:

• Analog input voltage range

• Single-ended or differential configuration

• Reference voltage

The axes of an ADC transfer function are typically in least
significant bits (LSBs). For the MAX1300/MAX1301, an
LSB is calculated using the following equation:

where N is the number of bits (N = 16) and FSR is the
full-scale range (see Figures 7 and 8).

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,

Serial 16-Bit ADCs

______________________________________________________________________________________ 21

Figure 9. Common-Mode Voltage vs. Input Voltage (FSR = 12V)

Figure 10. Common-Mode Voltage vs. Input Voltage (FSR = 24V)

Figure 11. Common-Mode Voltage vs. Input Voltage (FSR = 48V)

12

8

4

0

-4

-8

COMMON-MODE VOLTAGE (V)

-12

-16

-18 18
INPUT VOLTAGE (V)

12

8

4

0

-4

-8

COMMON-MODE VOLTAGE (V)

-12

-16

-18 18
INPUT VOLTAGE (V)

1260-6-12

1260-6-12

12

8

4

0

-4

-8

COMMON-MODE VOLTAGE (V)

-12

-16

-18 18
INPUT VOLTAGE (V)

1260-6-12

FSR V

×

.

×

REF

V

1

LSB

=

N

2 4 096

MAX1300/MAX1301

Mode Control

The MAX1300/MAX1301 contain one byte-wide mode­control register. The timing diagram of Figure 15 shows
how to use the mode-control byte, and the mode-con­trol byte format is shown in Table 7. The mode-control
byte is used to select the conversion method and to
control the power modes of the MAX1300/MAX1301.

Selecting the Conversion Method

The conversion method is selected using the mode-con­trol byte (see the Mode Control section), and the conver­sion is initiated using a conversion-start command (Table
3, and Figures 2, 3, and 4).The MAX1300/MAX1301 con­vert analog signals to digital data using one of three
methods:

• External Clock Mode, Mode 0 (Figure 2)

• Highest maximum throughput (see the Electrical
Characteristics table)

• User controls the sample instant

• CS remains low during the conversion

• User supplies SCLK throughout the ADC con­version and reads data at DOUT

• External Acquisition Mode, Mode 1 (Figure 3)

• Lowest maximum throughput (see the Electrical
Characteristics table)

• User controls the sample instant

• User supplies two bytes of SCLK, then drives
CS high to relieve processor load while the ADC
converts

• After SSTRB transitions high, the user supplies
two bytes of SCLK and reads data at DOUT

• Internal Clock Mode, Mode 2 (Figure 4)

• High maximum throughput (see the Electrical
Characteristics table)

• The internal clock controls the sampling instant

8-/4-Channel, ±12V Multirange Inputs,
Serial 16-Bit ADCs

22 ______________________________________________________________________________________

Figure 13. Ideal Unipolar Transfer Function, Single-Ended
Input, -FSR to 0

Figure 14. Ideal Unipolar Transfer Function, Single-Ended
Input, 0 to +FSR

Figure 12. Ideal Bipolar Transfer Function, Single-Ended or
Differential Input

FFFF

FFFE

FFFD

8001

8000

7FFF

BINARY OUTPUT CODE (LSB [hex])

0003

0002

0001

0000

-32,768 -32,766 0 +32,765 +32,767

INPUT VOLTAGE (LSB [DECIMAL])

FSR

1 LSB =

-1 +1

AGND1 (DIF/SGL = 0)

OV (DIF/SGL = 1)

FSR x V

REF

65,536 x 4.096V

FFFF

FFFE

FFFD

8001

8000

7FFF

BINARY OUTPUT CODE (LSB [hex])

0003

0002

0001

0000

0 1 2 3 32,768 65,533 65,535

(AGND1)

INPUT VOLTAGE (LSB [DECIMAL])

FSR

1 LSB =

FSR x V

REF

65,536 x 4.096V

FSR

FSR

FFFF

FFFE

FFFD

8001

8000

7FFF

BINARY OUTPUT CODE (LSB [hex])

0003

0002

0001

0000

0 1 2 3 32,768 65,533 65,535

INPUT VOLTAGE (LSB [DECIMAL])

FSR

1 LSB =

FSR x V

REF

65,536 x 4.096V

FSR

(AGND1)

• User supplies one byte of SCLK, then drives CS

high to relieve processor load while the ADC
converts

• After SSTRB transitions high, the user supplies
two bytes of SCLK and reads data at DOUT

External Clock Mode (Mode 0)

The MAX1300/MAX1301’s fastest maximum throughput
rate is achieved operating in external clock mode.
SCLK controls both the acquisition and conversion of
the analog signal, facilitating precise control over when
the analog signal is captured. The analog input sam­pling instant is at the falling edge of the 14th SCLK
(Figure 2).

Since SCLK drives the conversion in external clock
mode, the SCLK frequency should remain constant
while the conversion is clocked. The minimum SCLK
frequency prevents droop in the internal sampling
capacitor voltages during conversion.

SSTRB remains low in the external clock mode, and as a
result may be left unconnected if the MAX1300/
MAX1301 will always be used in the external clock mode.

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,

Serial 16-Bit ADCs

______________________________________________________________________________________ 23

Figure 15. Analog Input Configuration Byte and Mode-Control Byte Timing

Figure 16. DOUT and SSTRB Timing

Table 7. Mode-Control Byte

t

HIGH

IMPEDANCE

CSPW

SCLK

DOUT

CS

DIN

t

CSS

t

DS

t

DV

HIGH

IMPEDANCE

t

CL

18

START

SEL2

SEL1 SEL0 R2 R1

ANALOG INPUT CONFIGURATION BYTE

t

CP

t

DIF/SGL

CH

t

CSH

t

DH

R0

t

TR

SSTRB

t

SSCS

SCLK

DOUT

CS

t

CSS

t

DO

HIGH

IMPEDANCE

MSB

NOTE:

SSTRB AND CS REMAIN LOW IN EXTERNAL CLOCK MODE (MODE 0).

18

START

M2

M1 M0 1 0 0

MODE CONTROL BYTE

0

HIGH

IMPEDANCE

BIT NUMBER BIT NAME DESCRIPTION

7 START Start Bit. The first logic 1 after CS goes low defines the beginning of the mode-control byte.

6M2

5M1

4M0

3 1 Bit 3 must be a logic 1 for the mode-control byte.

2 0 Bit 2 must be a logic 0 for the mode-control byte.

1 0 Bit 1 must be a logic 0 for the mode-control byte.

0 0 Bit 0 must be a logic 0 for the mode-control byte.

Mode-Control Bits. M[2:0] select the mode of operation as shown in Table 8.

MAX1300/MAX1301

External Acquisition Mode (Mode 1)

The slowest maximum throughput rate is achieved with
the external acquisition method. SCLK controls the
acquisition of the analog signal in external acquisition
mode, facilitating precise control over when the analog
signal is captured. The internal clock controls the con­version of the analog input voltage. The analog input
sampling instant is at the falling edge of the 16th SCLK
(Figure 3).

For the external acquisition mode, CS must remain low
for the first 15 clock cycles and the rise on or after the
falling edge of the 16th SCLK cycle as shown in Figure

3. For optimal performance, idle DIN and SCLK during
the conversion. With careful board layout, transitions at
DIN and SCLK during the conversion have a minimal
impact on the conversion result.

After the conversion is complete, SSTRB asserts high
and CS can be brought low to read the conversion
result. SSTRB returns low on the rising SCLK edge of
the subsequent start bit.

Internal Clock Mode (Mode 2)

In internal clock mode, the internal clock controls both
acquisition and conversion of the analog signal. The inter­nal clock starts approximately 100ns to 400ns after the
falling edge of the eighth SCLK and has a rate of about

4.5MHz. The analog input sampling instant occurs at the
falling edge of the 11th internal clock signal (Figure 4).

For the internal clock mode, CS must remain low for the
first seven SCLK cycles and then rise on or after the
falling edge of the eighth SCLK cycle. After the conver­sion is complete, SSTRB asserts high and CS can be
brought low to read the conversion result. SSTRB returns
low on the rising SCLK edge of the subsequent start bit.

Reset (Mode 4)

As shown in Table 8, set M[2:0] = 100 to reset the
MAX1300/MAX1301 to its default conditions. The
default conditions are full power operation with each
channel configured for ±12V, bipolar, single-ended
conversions using external clock mode (mode 0).

Partial Power-Down Mode (Mode 6)

As shown in Table 8, when M[2:0] = 110, the device
enters partial power-down mode. In partial power­down, all analog portions of the device are powered
down except for the reference voltage generator and
bias supplies.

To exit partial power-down, change the mode by issu­ing one of the following mode-control bytes (see the
Mode Control section):

• External-Clock-Mode Control Byte

• External-Acquisition-Mode Control Byte

• Internal-Clock-Mode Control Byte

• Reset Byte

• Full Power-Down-Mode Control Byte

This prevents the MAX1300/MAX1301 from inadvertent­ly exiting partial power-down mode because of a CS
glitch in a noisy digital environment.

Full Power-Down Mode (Mode 7)

When M[2:0] = 111, the device enters full power-down
mode and the total supply current falls to 1µA (typ). In
full power-down, all analog portions of the device are
powered down. When using the internal reference,
upon exiting full power-down mode, allow 10ms for the
internal reference voltage to stabilize prior to initiating a
conversion.

To exit full power-down, change the mode by issuing
one of the following mode-control bytes (see the Mode
Control section):

• External-Clock-Mode Control Byte

8-/4-Channel, ±12V Multirange Inputs,
Serial 16-Bit ADCs

24 ______________________________________________________________________________________

Table 8. Mode-Control Bits M[2:0]

M2 M1 M0 MODE

0 0 0 External Clock (DEFAULT)

0 0 1 External Acquisition

0 1 0 Internal Clock

0 1 1 Reserved

1 0 0 Reset

1 0 1 Reserved

1 1 0 Partial Power-Down

1 1 1 Full Power-Down

• External-Acquisition-Mode Control Byte

• Internal-Clock-Mode Control Byte

• Reset Byte

• Partial Power-Down-Mode Control Byte

This prevents the MAX1300/MAX1301 from inadvertent­ly exiting full power-down mode because of a CS glitch
in a noisy digital environment.

Power-On Reset

The MAX1300/MAX1301 power up in normal operation
configured for external clock mode with all circuitry
active (Tables 7 and 8). Each analog input channel
(CH0–CH7) is set for single-ended conversions with a
±12V bipolar input range (Table 6).

Allow the power supplies to stabilize after power-up. Do
not initiate any conversions until the power supplies
have stabilized. Additionally, allow 10ms for the internal
reference to stabilize when C

REF

= 1.0µF and C

RECAP

= 0.1µF. Larger reference capacitors require longer
stabilization times.

Internal or External Reference

The MAX1300/MAX1301 operate with either an internal or
external reference. The reference voltage impacts the
ADC’s FSR (Figures 12, 13, and 14). An external refer­ence is recommended if more accuracy is required than
the internal reference provides, and/or multiple converters
require the same reference voltage.

Internal Reference

The MAX1300/MAX1301 contain an internal 4.096V
bandgap reference. This bandgap reference is connect­ed to REFCAP through a nominal 5kΩ resistor (Figure 17).
The voltage at REFCAP is buffered creating 4.096V at

REF. When using the internal reference, bypass
REFCAP with a 0.1µF or greater capacitor to AGND1 and
bypass REF with a 1.0µF or greater capacitor to AGND1.

External Reference

For external reference operation, disable the internal
reference and reference buffer by connecting REFCAP
to AV

DD1

. With AV

DD1

connected to REFCAP, REF
becomes a high-impedance input and accepts an
external reference voltage. The MAX1300/MAX1301
external reference current varies depending on the
applied reference voltage and the operating mode (see
the External Reference Input Current vs. External
Reference Input Voltage in the Typical Operating
Characteristics).

Applications Information

Noise Reduction

Additional samples can be taken and averaged (over­sampling) to remove the effect of transition noise on
conversion results. The square root of the number of
samples determines the improvement in performance.
For example, with 2/3LSB

RMS

(4LSB

P-P

) transition
noise, 16 (42= 16) samples must be taken to reduce
the noise to 1LSB

P-P

.

Interface with 0 to 10V Signals

In industrial control applications, 0 to 10V signaling is
common. For 0 to 10V applications, configure the selected
MAX1300/MAX1301 input channel for the single-ended 0
to 12V input range (R[2:0] = 110, Table 6). The 0 to 12V
range accommodates 0 to 10V where the signals saturate
at approximately 12V if out of range.

Interface with 4–20mA Signals

Figure 19 illustrates a simple interface between the
MAX1300/MAX1301 and a 4–20mA signal. 4–20mA sig­naling can be used as a binary switch (4mA represents
a logic-low signal, 20mA represents a logic-high sig­nal), or for precision communication where currents
between 4mA and 20mA represent intermediate analog
data. For binary switch applications, connect the
4–20mA signal to the MAX1300/MAX1301 with a resis­tor to ground. For example, a 250Ω resistor converts
the 4–20mA signal to a 1V to 5V signal. Adjust the
resistor value so the parallel combination of the resistor
and the MAX1300/MAX1301 source impedance is
250Ω. In this application, select the single-ended 0 to
6V range (R[2:0] = 011, Table 6). For applications that
require precision measurements of continuous analog
currents between 4mA and 20mA, use a buffer to pre­vent the MAX1300/MAX1301 input from diverting cur­rent from the 4–20mA signal.

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,

Serial 16-Bit ADCs

______________________________________________________________________________________ 25

Figure 17. Internal Reference Operation

SAR

ADC

MAX1300
MAX1301

REFERENCE

REF

4.096V

BANDGAP

4.096V

1x

5kΩ

REFCAP

V

RCTH

AGND1

REF

1.0µF

0.1µF

MAX1300/MAX1301

Bridge Application

The MAX1300/MAX1301 convert 1kHz signals more
accurately than a similar sigma-delta converter that
might be considered in bridge applications. The input
impedance of the MAX1300, in combination with the cur­rent-limiting resistors, can affect the gain of the
MAX1300. In many applications this error is acceptable,
but for applications that cannot tolerate this error, the
MAX1300 inputs can be buffered (Figure 20). Connect
the bridge to a low-offset differential amplifier and then
the true-differential inputs of the MAX1300/MAX1301.
Larger excitation voltages take advantage of more of the
±3V differential input voltage range. Select an input volt­age range that matches the amplifier output. Be aware of
the amplifier offset and offset-drift errors when selecting
an appropriate amplifier.

Dynamically Adjusting the Input Range

Software control of each channel’s analog input range
and the unipolar endpoint overlap specification make it
possible for the user to change the input range for a
channel dynamically and improve performance in some
applications. Changing the input range results in a
small LSB step-size over a wider output voltage range.
For example, by switching between a -6V to 0V range
and a 0 to 6V range, an LSB is

but the input voltage range effectively spans from -6V
to +6V (FSR = 12V).

Layout, Grounding, and Bypassing

Careful PC board layout is essential for best system per­formance. Boards should have separate analog and
digital ground planes and ensure that digital and analog
signals are separated from each other. Do not run ana­log and digital (especially clock) lines parallel to one
another, or digital lines underneath the device package.

Figure 1 shows the recommended system ground con­nections. Establish an analog ground point at AGND1
and a digital ground point at DGND. Connect all analog
grounds to the star analog ground. Connect the digital
grounds to the star digital ground. Connect the digital
ground plane to the analog ground plane at one point.
For lowest noise operation, make the ground return to
the star ground’s power-supply low impedance and as
short as possible.

High-frequency noise in the AV

DD1

power supply
degrades the ADC’s high-speed comparator perfor­mance. Bypass AV

DD1

to AGND1 with a 0.1µF ceramic
surface-mount capacitor. Make bypass capacitor con­nections as short as possible.

Parameter Definitions

Integral Nonlinearity (INL)

INL is the deviation of the values on an actual transfer
function from a straight line. This straight line is either a
best straight-line fit or a line drawn between the end­points of the transfer function once offset and gain
errors have been nullified. The MAX1300/MAX1301 INL
is measured using the endpoint method.

8-/4-Channel, ±12V Multirange Inputs,
Serial 16-Bit ADCs

26 ______________________________________________________________________________________

Figure 18. External Reference Operation

V+

REF

4.096V

BANDGAP

4.096V

1x

5kΩ

SAR

ADC

MAX1300
MAX1301

REFERENCE

6

VV

×

REF

65 536 4 096

, .

×

1.0µF

REFCAP

V

RCTH

AGND1

REF

IN

OUT

1.0µF

MAX6341

AV

DD1

GND

Differential Nonlinearity (DNL)

DNL is the difference between an actual step width and
the ideal value of 1 LSB. A DNL error specification of
greater than -1 LSB guarantees no missing codes and
a monotonic transfer function.

Transition Noise

Transition noise is the amount of noise that appears at a
code transition on the ADC transfer function. Conversions
performed with the analog input right at the code transi­tion can result in code flickering in the LSBs.

Channel-to-Channel Isolation

Channel-to-channel isolation indicates how well each
analog input is isolated from the others. The channel-to­channel isolation for these devices is measured by
applying a near full-scale magnitude 5kHz sine wave to
the selected analog input channel while applying an
equal magnitude sine wave of a different frequency to
all unselected channels. An FFT of the selected chan­nel output is used to determine the ratio of the magni­tudes of the signal applied to the unselected channels
and the 5kHz signal applied to the selected analog
input channel. This ratio is reported, in dB, as channel­to-channel isolation.

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,

Serial 16-Bit ADCs

______________________________________________________________________________________ 27

4–20mA INPUT

Figure 19. 4–20mA Application

Figure 20. Bridge Application

4–20mA INPUT

CH0

250Ω

MAX1300

CH8

250Ω

µC

LOW-OFFSET

DIFFERENTIAL

AMPLIFIER

BRIDGE

CH0

CH1

REF

MAX1300
MAX1301

µ

P

MAX1300/MAX1301

Unipolar Offset Error

-FSR to 0V

When a zero-scale analog input voltage is applied to
the converter inputs, the digital output is all ones
(0xFFFF). Ideally, the transition from 0xFFFF to 0xFFFE
occurs at AGND1 - 0.5 LSB. Unipolar offset error is the
amount of deviation between the measured zero-scale
transition point and the ideal zero-scale transition point,
with all untested channels grounded.

0V to +FSR

When a zero-scale analog input voltage is applied to
the converter inputs, the digital output is all zeros
(0x0000). Ideally, the transition from 0x0000 to 0x0001
occurs at AGND1 + 0.5 LSB. Unipolar offset error is the
amount of deviation between the measured zero-scale
transition point and the ideal zero-scale transition point,
with all untested channels grounded.

Bipolar Offset Error

When a zero-scale analog input voltage is applied to the
converter inputs, the digital output is a one followed by
all zeros (0x8000). Ideally, the transition from 0x7FFF to
0x8000 occurs at (2

N-1

- 0.5)LSB. Bipolar offset error is
the amount of deviation between the measured midscale
transition point and the ideal midscale transition point,
with untested channels grounded.

Gain Error

When a positive full-scale voltage is applied to the con­verter inputs, the digital output is all ones (0xFFFF). The
transition from 0xFFFE to 0xFFFF occurs at 1.5 LSB
below full scale. Gain error is the amount of deviation
between the measured full-scale transition point and
the ideal full-scale transition point with the offset error
removed and all untested channels grounded.

Unipolar Endpoint Overlap

Unipolar endpoint overlap is the change in offset when
switching between complementary input voltage
ranges. For example, the difference between the volt­age that results in a 0xFFFF output in the -6V to 0V
input voltage range and the voltage that results in a
0x0000 output in the 0 to +6V input voltage range is the
unipolar endpoint overlap. The unipolar endpoint over­lap is positive for the MAX1300/MAX1301, preventing
loss of signal or a dead zone when switching between
adjacent analog input voltage ranges.

Small-Signal Bandwidth

A 100mV

P-P

sine wave is applied to the ADC, and the
input frequency is then swept up to the point where the
amplitude of the digitized conversion result has
decreased by -3dB.

Full-Power Bandwidth

A 95% of full-scale sine wave is applied to the ADC,
and the input frequency is then swept up to the point
where the amplitude of the digitized conversion result
has decreased by -3dB.

Common-Mode Rejection Ratio (CMRR)

CMRR is the ability of a device to reject a signal that is
“common” to or applied to both input terminals. The
common-mode signal can be either an AC or a DC sig­nal or a combination of the two. CMR is expressed in
decibels. Common-mode rejection ratio is the ratio of
the differential signal gain to the common-mode signal
gain. CMRR applies only to differential operation.

Power-Supply Rejection Ratio (PSRR)

PSRR is the ratio of the output-voltage shift to the
power-supply-voltage shift for a fixed input voltage. For
the MAX1300/MAX1301, AV

DD1

can vary from 4.75V to

5.25V. PSRR is expressed in decibels and is calculated
using the following equation:

For the MAX1300/MAX1301, PSRR is tested in bipolar
operation with the analog inputs grounded.

Aperture Jitter

Aperture jitter, tAJ, is the statistical distribution of the
variation in the sampling instant (Figure 21).

Aperture Delay

Aperture delay, tAD, is the time from the falling edge of
SCLK to the sampling instant (Figure 21).

Signal-to-Noise Ratio (SNR)

SNR is computed by taking the ratio of the RMS signal
to the RMS noise. RMS noise includes all spectral com­ponents to the Nyquist frequency excluding the funda­mental, the first five harmonics, and the DC offset.

Signal-to-Noise Plus Distortion (SINAD)

SINAD is computed by taking the ratio of the RMS sig­nal to the RMS noise plus distortion. RMS noise plus
distortion includes all spectral components to the
Nyquist frequency excluding the fundamental and the
DC offset.

8-/4-Channel, ±12V Multirange Inputs,
Serial 16-Bit ADCs

28 ______________________________________________________________________________________

PSRR dB

[ ] log

=×

20

⎛
⎜

VVVV

⎝

−

VV

. .

525 475

(. ) (. )

525 475

OUT OUT

−

SINAD dB

( ) log=×

20

⎛

Signal

⎜

Noise

⎝

RMS

RMS

⎞
⎟

⎠

⎞
⎟

⎠

Effective Number of Bits (ENOB)

ENOB indicates the global accuracy of an ADC at a
specific input frequency and sampling rate. With an
input range equal to the ADC’s full-scale range, calcu­late the ENOB as follows:

Total Harmonic Distortion (THD)

For the MAX1300/MAX1301, THD is the ratio of the
RMS sum of the input signal’s first four harmonic com­ponents to the fundamental itself. This is expressed as:

where V

1

is the fundamental amplitude, and V2through
V5are the amplitudes of the 2nd- through 5th-order
harmonic components.

Spurious-Free Dynamic Range (SFDR)

SFDR is the ratio of RMS amplitude of the fundamental
(maximum signal component) to the RMS value of the
next-largest spectral component.

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,

Serial 16-Bit ADCs

______________________________________________________________________________________ 29

Figure 21. Aperture Diagram

ENOB

⎛

=

⎜
⎝

SINAD

− 176

.

602

.

⎞
⎟

⎠

THD

⎛

2

VVVV

2

20

log

=×

⎜
⎜
⎝

2

+++

3

2

4

V

1

⎞

2

5

⎟
⎟
⎠

SCLK

(MODE 0)

SCLK

(MODE 1)

INTCLK

(MODE 2)

ANALOG INPUT

TRACK AND HOLD

13

15

10

14

16

11

TRACK HOLD

15

12

t

AJ

t

AD

SAMPLE INSTANT

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,
Serial 16-Bit ADCs

30 ______________________________________________________________________________________

Chip Information

TRANSISTOR COUNT: 28,210

PROCESS: BiCMOS

Block Diagram

MAX1300

CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7

AGND1

ANALOG

INPUT MUX

AND

MULTIRANGE

CIRCUITRY

PGA

AGND2

AV

DD2

4.096V

BANDGAP

REFERENCE

1x

5k

Ω

IN

REF

REFCAP

REF

CONTROL LOGIC AND REGISTERS

FIFO

CLOCK

OUT

SAR

ADC

SERIAL I/O

AGND2

AV

DD2

AGND3

AV

DD1

DGND

DV

DD

DGNDO

SCLK

DOUT

SSTRB

DIN

CS

DV

DDO

Pin Configurations (continued)

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

AGND2

AV

DD2

AGND3

REFCH1

CH0

AV

DD1

AGND1

REFCAP

DV

DD

DV

DDO

DGNDDIN

CS

CH3

CH2

12

11

9

10

DGNDO

DOUTSCLK

SSTRB

MAX1301

TSSOP

TOP VIEW

Revision History

Pages changed at Rev 1: 1-6, 8, 31

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,

Serial 16-Bit ADCs

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 31

© 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages

.)

TSSOP4.40mm.EPS

PACKAGE OUTLINE, TSSOP 4.40mm BODY

21-0066

1

I

1