Rainbow Electronics MAX1303 User Manual
General Description
The MAX1302/MAX1303 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 MAX1302 provides eight (single-ended) or four
(true differential) analog input channels. The MAX1303
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 +V
REF
/2, -V
REF
/2 to 0,
0 to +V
REF
, -V
REF
to 0, ±V
REF
/4, ±V
REF
/2, and ±V
REF
),
and three differential input ranges (±V
REF
/2, ±V
REF
,
±2 x V
REF
).
An on-chip +4.096V reference offers a small convenient
ADC solution. The MAX1302/MAX1303 also accept an
external reference voltage between 3.800V and 4.136V.
The MAX1302 is available in a 24-pin TSSOP package
and the MAX1303 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 +V
REF
/2, -V
REF
/2 to 0, 0 to +V
REF
, -V
REF
to 0, ±V
REF
/4, ±V
REF
/2, and ±V
REF
♦ Differential Input Ranges
±V
REF
/2, ±V
REF
, and ±2 x V
REF
♦ Eight Single-Ended or Four Differential Analog
Inputs (MAX1302)
♦ Four Single-Ended or Two Differential Analog
Inputs (MAX1303)
♦ ±6V Overvoltage Tolerant Inputs
♦ Internal or External Reference
♦ 115ksps Maximum Sample Rate
♦ Single +5V Power Supply
♦ 20-/24-Pin TSSOP Package
MAX1302/MAX1303
8-/4-Channel, ±V
REF
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
MAX1302
19-3576; Rev 1; 12/06
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.
PART
PIN-
C H A N N EL S
PKG CODE
MAX1302AEUG*
24 TSSOP 8 U24-1
MAX1302BEUG*
24 TSSOP 8 U24-1
MAX1303AEUP* 20 TSSOP 4 U20-2
MAX1303BEUP 20 TSSOP 4 U20-2
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.
Note: All devices are specified over the -40°C to +85°C operating temperature range.
PACKAGE
MAX1302/MAX1303
8-/4-Channel, ±V
REF
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
(±V
REF
), 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 ...................................................-6V to +6V
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
PARAMETER
CONDITIONS
UNITS
DC ACCURACY (Notes 1, 2)
Resolution 16 Bits
MAX130_A
±2
Integral Nonlinearity INL
MAX130_B
±4
LSB
Differential Nonlinearity DNL No missing codes -1 +2 LSB
Transition Noise External or internal reference 1
LSB
RMS
Unipolar 0
Bipolar
Unipolar 0
Offset Error
Differential inputs
(Note 3)
Bipolar
mV
Channel-to-Channel Gain
Matching
Unipolar or bipolar
%FSR
Channel-to-Channel Offset Error
Matching
Unipolar or bipolar 1.0 mV
Unipolar 10
Offset Temperature Coefficient
Bipolar 5
ppm/°C
Unipolar
Gain Error
Bipolar
%FSR
Unipolar 1.5
Gain Temperature Coefficient
Bipolar 1.0
ppm/°C
Unipolar Endpoint Overlap
Negative unipolar full scale to positive
unipolar zero-scale
020 LSB
DYNAMIC SPECIFICATIONS f
IN(SINE-WAVE)
= 5kHz, VIN = FSR - 0.05dB, f
SAMPLE
= 130ksps (Notes 1, 2)
Differential inputs, FSR = 2 x V
REF
90
Single-ended inputs, FSR = V
REF
88
Single-ended inputs, FSR = V
REF
/ 2 85
Signal-to-Noise Plus Distortion SINAD
Single-ended inputs, FSR = V
REF
/ 4 80 82
dB
SYMBOL
MIN TYP MAX
±1.0
±1.0
Single-ended inputs
-1.0 ±10
-2.0 ±20
0.025
±10
±20
±0.5
±0.3
MAX1302/MAX1303
8-/4-Channel, ±V
REF
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
(±V
REF
), C
DOUT
= 50pF, C
SSTRB
= 50pF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETER
CONDITIONS
UNITS
Differential inputs, FSR = 2 x V
REF
90
Single-ended inputs, FSR = V
REF
88
Single-ended inputs, FSR = V
REF
/ 2 85
Signal-to-Noise Ratio SNR
Single-ended inputs, FSR = V
REF
/ 4 82
dB
Total Harmonic Distortion
(Up to the 5th Harmonic)
THD -98 dB
Spurious-Free Dynamic Range SFDR 92 99 dB
Aperture Delay t
AD
Figure 21 15 ns
Aperture Jitter t
AJ
Figure 21
ps
Channel-to-Channel Isolation
dB
CONVERSION RATE
External clock mode, Figure 2
External acquisition mode, Figure 3 84Byte-Wide Throughput Rate
Internal clock mode, Figure 4
ksps
ANALOG INPUTS (CH0–CH3 MAX1303, CH0–CH7 MAX1302, AGND1)
Small-Signal Bandwidth All input ranges, VIN = 100mV
P-P
(Note 2) 1.5
MHz
Full-Power Bandwidth All input ranges, VIN = 4V
P-P
(Note 2)
kHz
R[2:1] = 001
R[2:1] = 010
0
R[2:1] = 011 0
R[2:1] = 100
R[2:1] = 101
0
R[2:1] = 110 0
Input Voltage Range (Table 6) V
CH_
R[2:1] = 111
V
Tr ue- D i ffer enti al Anal og C om m onM od e V ol tag e Rang e
V
CMDR
DIF/SGL = 1 (Note 4)
V
Common-Mode Rejection Ratio CMRR
75 dB
Input Current I
CH_
-V
REF
< V
CH_
< +V
REF
µA
Input Capacitance C
CH_
5pF
Input Resistance R
CH_
6kΩ
SYMBOL
f
SAMPLE
D IF/S G L = 1, i np ut vol tag e r ang e = ± V
/ 4
R E F
MIN TYP MAX
100
105
-V
REF
-V
REF
-V
REF
-V
REF
-V
REF
-4.75 +5.50
-1500 +650
700
/ 4 +V
/ 2
+V
/ 2 +V
114
106
/ 4
REF
/ 2
REF
/ 2
REF
+V
REF
+V
REF
MAX1302/MAX1303
8-/4-Channel, ±V
REF
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
(±V
REF
), C
DOUT
= 50pF, C
SSTRB
= 50pF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETER
CONDITIONS
UNITS
INTERNAL REFERENCE (Bypass REFCAP with 0.1µF to AGND1 and REF with 1.0µF to AGND1)
Reference Output Voltage V
REF
V
Reference Temperature
Coefficient
TC
REF
ppm/°C
REF shorted to AGND1 10
Reference Short-Circuit Current I
REFSC
REF shorted to AV
DD
-1
mA
Reference Load Regulation I
REF
= 0 to 0.5mA 0.1 10 mV
EXTERNAL REFERENCE (REFCAP = AVDD)
Reference Input Voltage Range V
REF
V
REFCAP Buffer Disable
Threshold
V
RCTH
(Note 5)
V
V
REF
= +4.096V, external clock mode,
external acquisition mode, internal clock
mode, or partial power-down mode
90
Reference Input Current I
REF
V
REF
= +4.096V, full power-down mode
µA
External clock mode, external acquisition
mode, internal clock mode, or partial
power-down mode
20 45 kΩ
Reference Input Resistance R
REF
Full power-down mode 40 MΩ
DIGITAL INPUTS (DIN, SCLK, CS)
Input High Voltage V
IH
0.7 x
V
Input Low Voltage V
IL
0.3 x
V
Input Hysteresis V
HYST
0.2 V
Input Leakage Current I
IN
VIN = 0 to DV
DDO
-10
µA
Input Capacitance C
IN
10 pF
DIGITAL OUTPUTS (DOUT, SSTRB)
DV
DDO
= 4.75V, I
SINK
= 10mA 0.4
Output Low Voltage V
OL
DV
DDO
= 2.7V, I
SINK
= 5mA 0.4
V
Output High Voltage V
OH
I
SOURCE
= 0.5mA
V
DOUT Tri-State Leakage Current
I
DDO
CS = DV
DDO
-10
µA
POWER REQUIREMENTS (AV
DD1
and AGND1, AV
DD2
and AGND2, DVDD and DGND, DV
DDO
and DGNDO)
Analog Supply Voltage AV
DD1
V
Digital Supply Voltage DV
DD
V
SYMBOL
MIN TYP MAX
4.056 4.096 4.136
±30
3.800 4.136
AV
DD1
- 0.4
DV
DDO
DV
DDO
- 0.4
4.75 5.25
4.75 5.25
±0.1 ±10
AV
DD1
- 0.1
200
DV
DDO
+10
+10
MAX1302/MAX1303
8-/4-Channel, ±V
REF
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
(±V
REF
), C
DOUT
= 50pF, C
SSTRB
= 50pF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETER
CONDITIONS
UNITS
Preamplifier Supply Voltage AV
DD2
V
Digital I/O Supply Voltage DV
DDO
V
Internal reference 3 3.5
AV
DD1
Supply Current I
AVDD1
External clock mode,
external acquisition
mode, or internal
clock mode
External reference 2.5 3
mA
DVDD Supply Current I
DVDD
External clock mode, external acquisition
mode, or internal clock mode
0.9 2 mA
AV
DD2
Supply Current I
AVDD2
External clock mode, external acquisition
mode, or internal clock mode
25 mA
DV
DDO
Supply Current
External clock mode, external acquisition
mode, or internal clock mode
0.2 1 mA
Partial power-down mode 1.3 mA
Total Supply Current
Full power-down mode 2 µA
Power-Supply Rejection Ratio PSRR All analog input ranges
LSB
TIMING CHARACTERISTICS (Figures 15 and 16)
External clock mode
62
External acquisition mode
62SCLK Period t
CP
Internal clock mode
83
µs
External clock mode
External acquisition mode 92
SCLK High Pulse Width (Note 6)
t
CH
Internal clock mode 40
ns
External clock mode
External acquisition mode 92
SCLK Low Pulse Width (Note 6) t
CL
Internal clock mode 40
ns
DIN to SCLK Setup t
DS
40 ns
DIN to SCLK Hold t
DH
0ns
SCLK Fall to DOUT Valid t
DO
40 ns
CS Fall to DOUT Enable t
DV
40 ns
SYMBOL
I
DVDDO
MIN TYP MAX
4.75 5.25
2.70 5.25
17.5
±0.5
272
228
100
109
109
MAX1302/MAX1303
8-/4-Channel, ±V
REF
Multirange Inputs,
Serial 16-Bit ADCs
6 _______________________________________________________________________________________
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
(±V
REF
), 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
TR
40 ns
CS Fall to SCLK Rise Setup t
CSS
40 ns
CS High Minimum Pulse Width t
CSPW
40 ns
SCLK Fall to CS Rise Hold t
CSH
0ns
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
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
MAX1302/03 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
TA = +85°C
TA = +25°C
TA = -40°C
EXTERNAL CLOCK MODE
PREAMPLIFIER SUPPLY CURRENT
vs. PREAMPLIFIER SUPPLY VOLTAGE
MAX1302/03 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
TA = +85°C
TA = +25°C
TA = -40°C
EXTERNAL CLOCK MODE
DIGITAL SUPPLY CURRENT
vs. DIGITAL SUPPLY VOLTAGE
MAX1302/03 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
TA = +85°C
TA = +25°C
TA = -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
(±V
REF
), C
DOUT
= 50pF, C
SSTRB
= 50pF; unless otherwise noted.)
MAX1302/MAX1303
8-/4-Channel, ±V
REF
Multirange Inputs,
Serial 16-Bit ADCs
_______________________________________________________________________________________ 7
DIGITAL I/O SUPPLY CURRENT
vs. DIGITAL I/O SUPPLY VOLTAGE
MAX1302/03 toc04
DV
DDO
(V)
I
DVDDO
(mA)
5.155.054.85 4.95
0.12
0.14
0.16
0.18
0.20
0.22
0.24
0.26
0.28
0.10
4.75 5.25
TA = +85°C
TA = +25°C
TA = -40°C
EXTERNAL CLOCK MODE
ANALOG SUPPLY CURRENT
vs. ANALOG SUPPLY VOLTAGE
MAX1302/03 toc05
AV
DD1
(V)
I
AVDD1
(mA)
5.155.054.954.85
0.47
0.49
0.51
0.53
0.55
0.45
4.75 5.25
TA = +85°C
TA = +25°C
TA = -40°C
PARTIAL POWER-DOWN MODE
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
(±V
REF
), C
DOUT
= 50pF, C
SSTRB
= 50pF; unless otherwise noted.)
PREAMPLIFIER SUPPLY CURRENT
vs. PREAMPLIFIER SUPPLY VOLTAGE
MAX1302/03 toc06
AV
DD2
(V)
I
AVDD2
(mA)
5.155.054.954.85
0.12
0.14
0.16
0.18
0.20
0.10
4.75 5.25
TA = +85°C
TA = +25°C
TA = -40°C
PARTIAL POWER-DOWN MODE
DIGITAL SUPPLY CURRENT
vs. DIGITAL SUPPLY VOLTAGE
MAX1302/03 toc07
DVDD (V)
I
DVDD
(mA)
5.154.85 5.054.95
0.122
0.124
0.126
0.128
0.130
0.132
0.134
0.136
0.120
4.75 5.25
PARTIAL POWER-DOWN MODE
TA = +85°C
TA = +25°C
TA = -40°C
MAX1302/MAX1303
8-/4-Channel, ±V
REF
Multirange Inputs,
Serial 16-Bit ADCs
8 _______________________________________________________________________________________
ANALOG SUPPLY CURRENT
vs. CONVERSION RATE
MAX1302/03 toc08
CONVERSION RATE (ksps)
I
AVDD1
(mA)
20015010050
0.5
1.0
1.5
2.0
2.5
3.0
0
0
EXTERNAL CLOCK MODE
PARTIAL
POWER-DOWN MODE
FULL
POWER-DOWN MODE
PREAMPLIFIER SUPPLY CURRENT
vs. CONVERSION RATE
MAX1302/03 toc09
I
AVDD2
(mA)
5
10
15
20
25
0
CONVERSION RATE (ksps)
200
150100500
f
CLK
= 7.5MHz (NOTE 6)
EXTERNAL CLOCK MODE
FULL POWER-DOWN MODE,
PARTIAL POWER-DOWN MODE
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
(±V
REF
), C
DOUT
= 50pF, C
SSTRB
= 50pF; unless otherwise noted.)
DIGITAL SUPPLY CURRENT
vs. CONVERSION RATE
MAX1302/03 toc10
I
DVDD
(mA)
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0
0
CONVERSION RATE (ksps)
200
15010050
f
CLK
= 7.5MHz (NOTE 6)
FULL POWER-DOWN MODE
EXTERNAL CLOCK MODE,
PARTIAL POWER-DOWN MODE
DIGITAL I/O SUPPLY CURRENT
vs. CONVERSION RATE
MAX1302/03 toc11
CONVERSION RATE (ksps)
I
DVDDO
(mA)
20015010050
0.1
0.2
0.3
0.4
0.5
0.6
0
0
f
CLK
= 7.5MHz (NOTE 6)
EXTERNAL CLOCK MODE
FULL POWER-DOWN MODE,
PARTIAL POWER-DOWN MODE
Note 6: 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.
MAX1302/MAX1303
8-/4-Channel, ±V
REF
Multirange Inputs,
Serial 16-Bit ADCs
_______________________________________________________________________________________ 9
EXTERNAL REFERENCE INPUT CURRENT
vs. EXTERNAL REFERENCE INPUT VOLTAGE
MAX1302/03 toc12
EXTERNAL REFERENCE VOLTAGE (V)
EXTERNAL REFERENCE CURRENT (mA)
4.104.054.003.953.903.85
0.13
0.14
0.15
0.16
0.12
3.80 4.15
ALL MODES
-0.10
-0.04
-0.06
-0.08
-0.02
0
0.02
0.04
0.06
0.08
0.10
-40 10-15 35 60 85
GAIN DRIFT
vs. TEMPERATURE
MAX1302toc13
TEMPERATURE (°C)
GAIN DRIFT (%)
+V
REF
/2 BIPOLAR
±
V
REF
BIPOLAR RANGE
±
V
REF
/4 BIPOLAR
-1.0
-0.4
-0.6
-0.8
-0.2
0
0.2
0.4
0.6
0.8
1.0
-40 10-15 35 60 85
OFFSET DRIFT
vs. TEMPERATURE
MAX1302toc14
TEMPERATURE (°C)
OFFSET ERROR (mV)
+V
REF
/4 BIPOLAR RANGE
±
V
REF
BIPOLAR
CHANNEL-TO-CHANNEL ISOLATION
vs. INPUT FREQUENCY
MAX1302/03 toc15
FREQUENCY (kHz)
ISOLATION (dB)
100010010
-100
-80
-60
-40
-20
0
-120
1 10,000
f
SAMPLE
= 115ksps
±
V
REF
BIPOLAR RANGE
CH0 TO CH2
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
MAX1302/03 toc16
FREQUENCY (kHz)
CMRR (dB)
100010010
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-100
110,000
f
SAMPLE
= 115ksps
±
V
REF
BIPOLAR RANGE
-2.0
-1.0
-1.5
0
-0.5
0.5
1.0
1.5
2.0
0 16,384 32,768 49,152 65,535
INTEGRAL NONLINEARITY
vs. DIGITAL OUTPUT CODE
MAX1302toc17
DIGITAL OUTPUT CODE
INL (LSB)
f
SAMPLE
= 115ksps
±
V
REF
BIPOLAR RANGE
-2.0
-1.0
-1.5
0
-0.5
0.5
1.0
1.5
2.0
0 16,384 32,768 49,152 65,535
DIFFERENTIAL NONLINEARITY
vs. DIGITAL OUTPUT CODE
MAX1302toc18
DIGITAL OUTPUT CODE
DNL (LSB)
f
SAMPLE
= 115ksps
±V
REF
BIPOLAR RANGE
-140
-60
-100
-120
-40
-80
-20
0
02010 30 40 50
FFT AT 5kHz
MAX1302toc19
TEMPERATURE (°C)
MAGNITUDE (dB)
f
SAMPLE
= 115ksps
f
IN(SINE WAVE)
= 5kHz
±
V
REF
BIPOLAR RANGE
100
0
1 100 1000
SNR, SINAD, ENOB
vs. ANALOG INPUT FREQUENCY
30
70
40
80
50
90
20
10
60
MAX1302/03 toc20
FREQUENCY (kHz)
SNR, SINAD (dB)
10
f
SAMPLE
= 115ksps
±V
REF
BIPOLAR RANGE
ENOB
SNR
SINAD
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
(±V
REF
), C
DOUT
= 50pF, C
SSTRB
= 50pF; unless otherwise noted.)
MAX1302/MAX1303
8-/4-Channel, ±V
REF
Multirange Inputs,
Serial 16-Bit ADCs
10 ______________________________________________________________________________________
SNR, SINAD, ENOB
vs. SAMPLE RATE
MAX1302/03 toc21
SAMPLE RATE (ksps)
SNR, SINAD (dB)
ENOB (BITS)
100101
20
40
60
80
100
0
8
10
12
14
16
6
0.1 1000
f
IN(SINE WAVE)
= 5kHz
±
V
REF
BIPOLAR RANGE
ENOB
SNR, SINAD
-SFDR, THD
vs. SAMPLE RATE
MAX1302/03 toc22
SAMPLE RATE (ksps)
-SFDR, THD (dB)
100101
-100
-80
-60
-40
-20
0
-120
0.1 1000
f
IN(SINE WAVE)
= 5kHz
±
V
REF
BIPOLAR RANGE
THD
-SFDR
0
-120
1 100 1000
-SFDR, THD
vs. ANALOG INPUT FREQUENCY
-80
-60
-40
-100
-20
MAX1302/03 toc23
FREQUENCY (kHz)
-SFDR, THD (dB)
10
f
SAMPLE
= 115ksps
±
V
REF
BIPOLAR RANGE
THD
-SFDR
-1.5
-0.5
-1.0
0.5
0
1.0
1.5
ANALOG INPUT CURRENT
vs. ANALOG INPUT VOLTAGE
MAX1302/03 toc24
ANALOG INPUT VOLTAGE (V)
ANALOG INPUT CURRENT (mA)
-6 -2 0-4 2 4 6
SMALL-SIGNAL BANDWIDTH
MAX1302/03 toc25
FREQUENCY (kHz)
ATTENUATION (dB)
100010010
-25
-20
-15
-10
-5
0
-30
110,000
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
(±V
REF
), C
DOUT
= 50pF, C
SSTRB
= 50pF; unless otherwise noted.)
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