MAXIM MAX1134, MAX1135 User Manual

General Description

The MAX1134/MAX1135 are 150ksps, 16-bit ADCs.
These serially interfaced ADCs connect directly to SPI™,
QSPI™, and MICROWIRE™ devices without external
logic. They combine an input scaling network, internal
track/hold (T/H), clock, and three general-purpose digital
output pins (for external multiplexer or PGA control) in a
20-pin SSOP package. The excellent dynamic perfor­mance (THD ≥ 90dB), high speed (150ksps in bipolar
mode), and low power (8.0mA) of these ADCs make
them ideal for applications such as industrial process
control, instrumentation, and medical applications.

The MAX1134 accepts input signals of 0 to +6V (unipo­lar) or ±6V (bipolar), while the MAX1135 accepts input
signals of 0 to +2.048V (unipolar) or ±2.048V (bipolar).
Operating from a single 3.135V to 3.465V analog and
digital supply, power-down modes reduce current con­sumption to 0.15mA at 10ksps and further reduce sup­ply current to less than 20µA at slower data rates.

A serial strobe output (SSTRB) allows direct connection
to the TMS320 family digital-signal processors. The
MAX1134/MAX1135 user can select either the internal
clock or an external serial-interface clock for the ADC to
perform analog-to-digital conversions.

The MAX1134/MAX1135 feature internal calibration cir­cuitry to correct linearity and offset errors. On-demand
calibration allows the user to optimize performance.
Three user-programmable logic outputs are provided
for the control of an 8-channel mux or PGA.

The MAX1134/MAX1135 are available in a 20-pin SSOP
package and are fully specified over the -40°C to
+85°C temperature range.

Applications

Industrial Process Control

Industrial I/O Modules

Data-Acquisition Systems

Medical Instruments

Portable and Battery-Powered Equipment

Features

♦ 150ksps (Bipolar) and 125ksps (Unipolar)

Sampling ADC

♦ 16 Bits, No Missing Codes
♦ 1LSB INL (typ) Guaranteed
♦ -100dB THD
♦ 3.3V Single-Supply Operation
♦ Low-Power Operation

4.5mA (typ) (Unipolar Mode)

♦ 1.2µA Shutdown Mode
♦ Software-Configurable Unipolar and Bipolar Input

Ranges

0 to +6V and ±6V (MAX1134)
0 to +2.048V and ±2.048V (MAX1135)

♦ Internal or External Clock
♦ SPI/QSPI/MICROWIRE TMS320-Compatible Serial

Interface

♦ Three User-Programmable Logic Outputs
♦ Small 20-Pin SSOP Package

MAX1134/MAX1135

16-Bit ADCs, 150ksps, 3.3V Single Supply

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2464; Rev 0; 4/02

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.

Ordering Information continued at end of data sheet.

Functional Diagram and Typical Application Circuit appear
at end of data sheet.

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

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

AIN

AGND

CREF

CSAV

DD

AGND

AV

DD

REF

TOP VIEW

DIN

DV

DD

DGND

SCLKP1

P2

SHDN

DGND

12

11

9

10

RST

DOUTSSTRB

PO

MAX1134
MAX1135

SSOP

Pin Configuration

PART

MAX1134BCAP 0°C to +70°C 20 SSOP ±2.5

MAX1134BEAP -40°C to +85°C 20 SSOP ±2.5

TEMP

RANGE

PIN­PACKAGE

INL

(LSB)

MAX1134/MAX1135

16-Bit ADCs, 150ksps, 3.3V Single Supply

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(AVDD= DVDD= 3.3V ±5%, f

SCLK

= 3.6MHz, external clock (50% duty cycle), 24 clocks/conversion (150ksps), bipolar input, V

REF

=

2.048V, C

REF

= 4.7µF, C

CREF

= 1µF, TA= T

MIN

to T

MAX

, 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.

AVDDto AGND, DVDDto DGND ..............................-0.3V to +6V

AGND to DGND.....................................................-0.3V to +0.3V

AIN to AGND ....................................................................±16.5V

CREF, REF to AGND................................-0.3V to (AVDD+ 0.3V)

Digital Inputs to DGND.............................................-0.3V to +6V

Digital Outputs to DGND .........................-0.3V to (DV

DD

+ 0.3V)

Continuous Power Dissipation (T

A

= +70°C)

20-Pin SSOP (derate 8.00mW/°C above +70°C) .........640mW

Operating Temperature Ranges

MAX113_ _CAP...................................................0°C to +70°C

MAX113_ _EAP................................................-40°C to +85°C

Storage Temperature Range .............................-60°C to +150°C

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

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

DC ACCURACY (Note 1)

Resolution 16 Bits
Relative Accuracy INL Bipolar mode (Note 2) MAX113_B 1.0 ±2.5 LSB

No Missing Codes 16 Bits

Differential Nonlinearity DNL Bipolar mode MAX113_B -1 +1.75 LSB

Transition Noise 1.5 LSB

Offset Error

Gain Error (Note 3)

Offset Drift (Bipolar and Unipolar) Excluding reference drift ±1 ppm/°C
Gain Drift (Bipolar and Unipolar) Excluding reference drift ±4 ppm/°C

D YNA M IC SPEC IF IC A T IO N S ( 5 k Hz SINE-WAVE INPUT, 15 0 k s ps , 3 .6M H z CLOCK, BIPOLAR INPUT MODE. M A X1 13 4 , 1 2 V
M A X1 1 3 5, 4 .0 9 6 V

Signal-to-Noise Plus Distortion
(SINAD)

Signal-to-Noise Ratio (SNR)

Total Harmonic Distortion (THD)

Spurious-Free Dynamic Range
(SFDR)

ANALOG INPUT

Input Range

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

P-P

.)

Unipolar ±4
Bipolar ±6
Unipolar ±0.2
Bipolar ±0.3

f

= 5kHz 80 84

IN

= 75kHz 83

f

IN

f

= 5kHz 80 84

IN

f

= 75kHz 83

IN

f

= 5kHz -100 -90

IN

f

= 75kHz -93

IN

f

= 5kHz 92 105

IN

= 75kHz 97

f

IN

MAX1134

MAX1135

P-P

Unipolar 0 +6

Bipolar -6 +6

Unipolar 0 +2.048

Bipolar -2.048 +2.048

mV

%FSR

.

dB

dB

dB

dB

V

RMS

MAX1134/MAX1135

16-Bit ADCs, 150ksps, 3.3V Single Supply

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(AVDD= DVDD= 3.3V ±5%, f

SCLK

= 3.6MHz, external clock (50% duty cycle), 24 clocks/conversion (150ksps), bipolar input, V

REF

=

2.048V, C

REF

= 4.7µF, C

CREF

= 1µF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Impedance

Input Capacitance 32 pF

CONVERSION RATE

Internal Clock Frequency 3 MHz

Aperture Delay t

Aperture Jitter t

MODE 1 (24 EXTERNAL CLOCK CYCLES PER CONVERSION)

External Clock Frequency f

Sample Rate

Conversion Time (Note 4)

MODE 2 (INTERNAL CLOCK MODE)

External Clock Frequency
(Data Transfer Only)

Conversion Time (SSTRB low pulse width) 5.3 7 µs

Acquisition Time (Note 5)

MODE 3 (32 EXTERNAL CLOCK CYCLES PER CONVERSION)

External Clock Frequency f

Sample Rate

Conversion Time (Note 4)

EXTERNAL REFERENCE

Input Range (Notes 6, 7) 1.9 2.048 2.2 V

DIGITAL INPUTS

Input High Voltage V

Input Low Voltage V

Input Leakage I

f

SCLK

t

CONV+ACQ

AD

AJ

SCLK

f

=

S

MAX1134

MAX1135

Unipolar 7.5 10.5

Bipolar 5.9 8.4

Unipolar 100 1000

Bipolar 3.4 5.3

Unipolar 0.1 3.0

Bipolar 0.1 3.6

Unipolar 4.17 125

/ 24

Bipolar 4.17 150

Unipolar 8 240

10 ns

50 ps

= 24 /
f

SCLK

Bipolar 6.7 240

Unipolar 1.67

Bipolar 1.39

SCLK

f

S

f

SCLK

t

CONV+ACQ

= 32 /
f

SCLK

IN

Unipolar or bipolar 0.1 3.6 MHz

=

Unipolar or bipolar 3.125 112 ksps

/ 32

Unipolar or bipolar 8.89 320 µs

V

IH

IL

= 2.048V, f

REF

V

= 2.048V, f

REF

In power-down, f

VIN = 0 or DV

= 3.6MHz 110

SCLK

= 0 100Input Current

SCLK

= 0 0.1

SCLK

DD

2.4 V

-1 +1 µA

MHz

ksps

4 MHz

0.8 V

kΩ

µs

µs

µA

MAX1134/MAX1135

16-Bit ADCs, 150ksps, 3.3V Single Supply

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(AVDD= DVDD= 3.3V ±5%, f

SCLK

= 3.6MHz, external clock (50% duty cycle), 24 clocks/conversion (150ksps), bipolar input, V

REF

=

2.048V, C

REF

= 4.7µF, C

CREF

= 1µF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

TIMING CHARACTERISTICS (Figures 5 and 6)

(AVDD= DVDD= 3.3V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Hysteresis V

Input Capacitance C

DIGITAL OUTPUTS

Output High Voltage V

Output Low Voltage V

Three-State Leakage Current I
Three-State Output Capacitance CS = DV

POWER SUPPLIES

Analog Supply AV

Digital Supply DV

Analog Supply Current I

Digital Supply Current I

Power-Supply Rejection Ratio
(Note 8)

HYST

IN

OH

OL

L

DD

DD

DV

-

I

SOURCE

I

SINK

I

SINK

CS = DV

= 0.5mA

= 5mA 0.4

= 16mA 0.8

DD

DD

DD

0.5

-10 +10 µA

3.135 3.3 3.465 V

3.135 3.3 3.465 V

Unipolar mode 3.9 8

ANALOG

Bipolar mode 7 11
SHDN = 0, or software power-down mode 0.1 10 µA

DIGITAL

PSRR AV

Unipolar or bipolar mode 1 2 mA
SHDN = 0, or software power-down mode 1.1 10 µA

= DVDD = 3.135V to 3.465V 65 dB

DD

0.2 V

10 pF

10 pF

mA

V

V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DIN to SCLK Setup t

DIN to SCLK Hold t

SCLK to DOUT Valid t

CS Fall to DOUT Enable t
CS Rise to DOUT Disable t
CS to SCLK Rise Setup t
CS to SCLK Rise Hold t

SCLK High Pulse Width t

SCLK Low Pulse Width t

SCLK Fall to SSTRB t

CS Fall to SSTRB Enable t
CS Rise to SSTRB Disable t

SSTRB Rise to SCLK Rise t
RST Pulse Width t

DS

DH

DO

DV

TR

CSS

CSH

CH

CL

SSTRB

SDV

STR

SCK

RS

C

LOAD

C

LOAD

C

LOAD

C

LOAD

C

LOAD

Internal clock mode 0 ns

50 ns

= 50pF 80 ns

= 50pF 80 ns

100 ns

0ns

120 ns

120 ns

= 50pF 80 ns

= 50pF, external clock mode 80 ns

= 50pF, external clock mode 80 ns

278 70 ns

0ns

70 ns

MAX1134/MAX1135

16-Bit ADCs, 150ksps, 3.3V Single Supply

_______________________________________________________________________________________ 5

TIMING CHARACTERISTICS (Figures 5 and 6) (continued)

(AVDD= DVDD= 3.3V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted.)

Note 1: Tested at AV

DD

= DV

DD

= 3.3V, bipolar input mode.

Note 2: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the gain error and offset

error have been nullified.

Note 3: Offset nullified.
Note 4: Conversion time is defined as the number of clock cycles multiplied by the clock period; clock has 50% duty cycle. Includes

the acquisition time.

Note 5: Acquisition time is 5 clock cycles in short acquisition mode and 13 clock cycles in long acquisition mode.
Note 6: Performance is limited by the converter’s noise floor, typically 300µV

P-P

.

Note 7: When an external reference has a different voltage than the specified typical value, the full scale of the ADC scales propor-

tionally.

Note 8: Defined as the change in positive full scale caused by a ±5% variation in the nominal supply voltage.

Typical Operating Characteristics

(MAX1134/MAX1135, AVDD= DVDD= 3.3V, f

SCLK

= 3.6MHz, external clock (50% duty cycle), 24 clocks/conversion (150ksps),

bipolar input, REF = 2.048V, 4.7µF on REF, 1µF on CREF, TA= +25°C, unless otherwise noted.)

-3

0

-1

-2

1

2

3

1 26545

13273

39817 53089

59725

INTEGRAL NONLINEARITY

vs. DIGITAL OUTPUT CODE

MAX1134/35 toc01

DIGITAL OUTPUT CODE

INTEGRAL NONLINEARITY (LSB)

-1.0

-0.6

-0.8

-0.2

-0.4

0.2

0

0.4

0.8

0.6

1.0

1 13649 27297 40945 54593 61417

DIFFERENTIAL NONLINEARITY

vs. DIGITAL OUTPUT CODE

MX1134/35 toc02

DIGITAL OUTPUT CODE

DIFFERENTIAL NONLINEARITY (LSB)

TOTAL SUPPLY CURRENT

vs. TEMPERATURE

MAX1134/35 toc03

TEMPERATURE (°C)

TOTAL SUPPLY CURRENT (mA)

806020 400-20

8.1

8.2

8.3

8.4

8.5

8.6

8.7

8.8

8.9

9.0

8.0

-40

A: AVDD, DVDD = 3.135V
B: AV

DD

, DVDD = 3.3V

C: AV

DD

, DVDD = 3.465V

C

B

A

MAX1134/MAX1135

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(MAX1134/MAX1135, AVDD= DVDD= 3.3V, f

SCLK

= 3.6MHz, external clock (50% duty cycle), 24 clocks/conversion (150ksps),

bipolar input, REF = 2.048V, 4.7µF on REF, 1µF on CREF, T

A

= +25°C, unless otherwise noted.)

OFFSET VOLTAGE

vs. TEMPERATURE

MAX1134/35 toc04

TEMPERATURE (°C)

OFFSET ERROR (mV)

806020 400-20

-3.0

-2.5

-1.5

-1.0

-0.5

-40

A: AVDD, DVDD = 3.135V
B: AV

DD

, DVDD = 3.3V

C: AV

DD

, DVDD = 3.465V

C

B

A

-2.0

GAIN ERROR

vs. TEMPERATURE

MAX1134/35 toc05

TEMPERATURE (°C)

GAIN ERROR (% FULL SCALE)

806020 400-20

0.01

0

0.03

0.02

0.04

0.05

0.06

-40

A: AVDD, DVDD = 3.135V
B: AV

DD

, DVDD = 3.3V

C: AV

DD

, DVDD = 3.465V

C

B

A

TOTAL SUPPLY CURRENT vs.

CONVERSION RATE (USING SHUTDOWN)

MAX1134/35 toc06

CONVERSION RATE (ksps)

TOTAL SUPPLY CURRENT (mA)

1000100101

0.01

100

10

1

0.1

0

FFT PLOT

MAX1134/35 toc07

FREQUENCY (kHz)

AMPLITUDE (dB)

605040302010

-100

-80

-60

-40

-20

0

-120
070

f

SAMPLE

= 150kHz

f

IN

= 5kHz

SINAD PLOT

MAX1134/35 toc08

FREQUENCY (kHz)

AMPLITUDE (dB)

101

10

20

30

40

50

60

70

80

90

100

0

0.1 100

f

SAMPLE

= 150kHz

SFDR PLOT

MAX1134/35 toc09

FREQUENCY (kHz)

AMPLITUDE (dB)

101

10

20

30

40

50

60

70

80

90

100

110

120

0

0.1 100

f

SAMPLE

= 150kHz

THD PLOT

MAX1134/35 toc10

FREQUENCY (kHz)

AMPLITUDE (dB)

101

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-110

0.1 100

f

SAMPLE

= 150kHz

16-Bit ADCs, 150ksps, 3.3V Single Supply