EVALUATION KIT AVAILABLE
MAX1202/MAX1203
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
General Description
The MAX1202/MAX1203 are 12-bit data-acquisition sys-
tems specifically designed for use in applications with
mixed +5V (analog) and +3V (digital) supply voltages.
They operate with a single +5V analog supply or dual ±5V
analog supplies, and combine an 8-channel multiplexer,
high-bandwidth track/hold, and serial interface with high
conversion speed and low power consumption.
A 4-wire serial interface connects directly to SPI/
MICROWIRE® devices without external logic, and a serial
strobe output allows direct connection to TMS320-family
digital signal processors. The MAX1202/MAX1203 use
either the internal clock or an external serial-interface clock
to perform successive approximation analog-to-digital con-
versions. The serial interface operates at up to 2MHz.
The MAX1202 features an internal 4.096V reference,
while the MAX1203 requires an external reference. Both
parts have a reference-buffer amplifier that simplifies gain
trim. They also have a V
L
pin that is the power supply for
the digital outputs. Output logic levels (3V, 3.3V, or 5V) are
determined by the value of the voltage applied to this pin.
These devices provide a hard-wired
SHDN
pin and two
software-selectable power-down modes. Accessing the
serial interface automatically powers up the devices. A
quick turn-on time enables the MAX1202/MAX1203 to
be shut down between conversions, allowing the user
to optimize supply currents. By customizing power-down
between conversions, supply current can drop below
10μA at reduced sampling rates.
The MAX1202/MAX1203 are available in 20-pin SSOP
and PDIP packages, and are specified for the commercial
and extended temperature ranges.
Features
●
8-Channel Single-Ended or 4-Channel Differential
Inputs
●
Operates from Single +5V or Dual ±5V Supplies
●
User-Adjustable Output Logic Levels
(2.7V to 5.25V)
●
Low Power: 1.5mA (Operating Mode)
2μA (Power-Down Mode)
●
Internal Track/Hold, 133kHz Sampling Rate
●
Internal 4.096V Reference (MAX1202)
●
SPI/MICROWIRE/TMS320-Compatible
4-Wire Serial Interface
●
Software-Configurable Unipolar/Bipolar Inputs
●
20-Pin PDIP/SSOP
Ordering Information
PART
MAX1202ACPP+
MAX1202BCPP+
MAX1202ACAP+
MAX1202BCAP+
TEMP RANGE
0ºC to +70ºC
0ºC to +70ºC
0ºC to +70ºC
0ºC to +70ºC
PIN-
PACKAGE
20 PDIP
20 PDIP
20 SSOP
20 SSOP
INL
(LSB)
±1/2
±1
±1/2
±1
Ordering Information continued at end of data sheet.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
TOP VIEW
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
V
SS
1
2
3
4
5
6
7
8
9
+
20 V
DD
19 SCLK
Applications
●
●
●
●
●
5V/3V Mixed-Supply Systems
Data Acquisition
High-Accuracy Process Control
Battery-Powered Instruments
Medical Instruments
MAX1202
MAX1203
18
CS
17 DIN
16 SSTRB
15 DOUT
14 V
L
13 GND
12 REFADJ
11 REF
Typical Operating Circuit appears at end of data sheet.
MICROWIRE is a registered trademark of National
Semiconductor Corp.
SHDN
10
PDIP/SSOP
19-1173; Rev 3; 3/12
MAX1202/MAX1203
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
Absolute Maximum Ratings
V
DD
to GND ............................................................-0.3V to +6V
V
L
............................................................. -0.3V to (V
DD
+ 0.3V)
V
SS
to GND .............................................................+0.3V to -6V
V
DD
to V
SS
............................................................-0.3V to +12V
CH0–CH7 to GND ......................... (V
SS
- 0.3V) to (V
DD
+ 0.3V)
CH0–CH7 Total Input Current ..........................................±20mA
REF to GND ............................................. -0.3V to (V
DD
+ 0.3V)
REFADJ to GND....................................... -0.3V to (V
DD
+ 0.3V)
Digital Inputs to GND ............................... -0.3V to (V
DD
+ 0.3V)
Digital Outputs to GND................................ -0.3V to (V
L
+ 0.3V)
Digital Output Sink Current ................................................25mA
Continuous Power Dissipation (T
A
= +70°C)
PDIP (derate 11.11mW/°C above +70°C) ....................889mW
SSOP (derate 8.00mW/°C above +70°C) ....................640mW
Operating Temperature Ranges
MAX1202_C_P/MAX1203_C_P..........................0°C to +70°C
MAX1202_E_P/MAX1203_E_P ...................... -40°C to +85°C
Storage Temperature Range ............................ -60°C to +150°C
Lead Temperature (soldering, 10s) ................................. +300°C
Soldering Temperature (reflow) .......................................+260°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.
Electrical Characteristics
(V
DD
= +5V ±5%, V
L
= 2.7V to 3.6V; V
SS
= 0V or -5V ±5%; f
SCLK
= 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion
cycle (133ksps); MAX1202—4.7μF capacitor at REF pin; MAX1203—external reference, V
REF
= 4.096V applied to REF pin; T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
DC ACCURACY (Note 1)
Resolution
Relative Accuracy (Note 2)
Differential Nonlinearity
Offset Error
MAX1202 (all grades)
Gain Error (Note 3)
Gain Temperature Coefficient
Channel-to-Channel Offset Matching
Signal-to-Noise Plus Distortion Ratio
Total Harmonic Distortion (up to the
5th Harmonic)
Spurious-Free Dynamic Range
Channel-to-Channel Crosstalk
Small-Signal Bandwidth
Full-Power Bandwidth
SINAD
THD
SFDR
V
IN
= 4.096V
P-P
, 65kHz (Note 4)
-3dB rolloff
80
-85
4.5
800
70
-80
External reference,
4.096V
MAX1203A
MAX1203B
±0.8
±0.1
RES
INL
DNL
MAX1202A/MAX1203A
MAX1202B/MAX1203B
no missing codes over temperature
12
±0.5
±1.0
±1.0
±3.0
±3
±1.5
±3
ppm/°C
LSB
dB
dB
dB
dB
MHz
kHz
LSB
Bits
LSB
LSB
LSB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
External reference, 4.096V
DYNAMIC SPECIFICATIONS (10kHz sine-wave input, 4.096V
P-P
, 133ksps, 2.0MHz external clock, bipolar-input mode)
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MAX1202/MAX1203
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
Electrical Characteristics (continued)
(V
DD
= +5V ±5%, V
L
= 2.7V to 3.6V; V
SS
= 0V or -5V ±5%; f
SCLK
= 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion
cycle (133ksps); MAX1202—4.7μF capacitor at REF pin; MAX1203—external reference, V
REF
= 4.096V applied to REF pin; T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
CONVERSION RATE
Conversion Time (Note 5)
Track/Hold Acquisition Time
Aperture Delay
Aperture Jitter
Internal Clock Frequency
External compensation mode, 4.7µF
External Clock Frequency Range
ANALOG INPUT
Input Voltage Range, Single-Ended
and Differential (Note 7)
Multiplexer Leakage Current
Input Capacitance
REF Output Voltage
REF Short-Circuit Current
MAX1202AC
V
REF
Temperature Coefficien
Load Regulation (Note 8)
Capacitive Bypass at REF
Capacitive Bypass at REFADJ
REFADJ Adjustment Range
EXTERNAL REFERENCE AT REF
(Reference buffer disabled, V
REF
= 4.096V)
Input Voltage Range
Input Current
Input Resistance
REF Input Current in Shutdown
REFADJ Buffer Disable Threshold
V
SHDN
= 0V
V
DD
-
50mV
12
2.50
200
20
1.5
10
V
DD
+
50mV
350
V
µA
kΩ
µA
V
MAX1202AE
MAX1202B
0 to 0.5mA output load
Internal compensation mode
External compensation mode
0
4.7
0.01
±1.5
±30
±30
±30
2.5
mV
µF
µF
%
Unipolar, V
SS
= 0V
Bipolar, V
SS
= -5V
On/off-leakage current, V
CH_
= ±5V
(Note 6)
T
A
= +25°C
4.076
16
4.096
4.116
30
±50
±60
ppm/°C
±0.01
V
REF
±V
REF
/2
±1
V
µA
pF
V
mA
Internal compensation mode (Note 6)
Used for data transfer only
0.1
0.1
0
t
CONV
t
ACQ
Internal clock
External clock, 2MHz, 12 clocks/conversion
5.5
6
1.5
10
< 50
1.7
2.0
0.4
2.0
MHz
10
µs
µs
ns
ps
MHz
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
INTERNAL REFERENCE
(MAX1202 only, reference-buffer enabled)
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│
3
MAX1202/MAX1203
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
Electrical Characteristics (continued)
(V
DD
= +5V ±5%, V
L
= 2.7V to 3.6V; V
SS
= 0V or -5V ±5%; f
SCLK
= 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion
cycle (133ksps); MAX1202—4.7μF capacitor at REF pin; MAX1203—external reference, V
REF
= 4.096V applied to REF pin; T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
Internal compensation mode
External compensation mode
MAX1202
MAX1203
MAX1202
MAX1203
V
DD
V
SS
Operating mode
Positive Supply Current
I
DD
Fast power-down (Note 9)
Full power-down (Note 9)
Negative Supply Current
Logic Supply Voltage
Logic Supply Current (Notes 6, 10)
Positive Supply Rejection (Note 11)
Negative Supply Rejection (Note 11)
Logic Supply Rejection (Note 12)
I
SS
V
L
I
L
PSR
PSR
PSR
V
L
= V
DD
= 5V
V
DD
= 5V ±5%; external reference, 4.096V;
full-scale input
V
SS
= -5V ±5%; external reference, 4.096V;
full-scale input
External reference, 4.096V; full-scale input
±0.06
±0.01
±0.06
Operating mode and fast power-down
Full power-down
2.70
5 ±5%
0 or 5
±5%
1.5
30
2
2.5
70
10
50
10
5.25
10
±0.5
±0.5
±0.5
MIN
0
4.7
1.68
1.64
±50
±5
TYP
MAX
UNITS
EXTERNAL REFERENCE AT REFADJ
Capacitive Bypass at REF
Reference-Buffer Gain
REFADJ Input Current
POWER REQUIREMENTS
Positive Supply Voltage
Negative Supply Voltage
V
V
mA
µA
µA
V
µA
mV
mV
mV
µF
V/V
µA
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4
MAX1202/MAX1203
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
Electrical Characteristics (continued)
(V
DD
= +5V ±5%, V
L
= 2.7V to 3.6V; V
SS
= 0V or -5V ±5%; f
SCLK
= 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion
cycle (133ksps); MAX1202—4.7μF capacitor at REF pin; MAX1203—external reference, V
REF
= 4.096V applied to REF pin; T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
DIGITAL INPUTS—DIN, SCLK,
CS
,
SHDN
DIN, SCLK,
CS
Input High Voltage
DIN, SCLK,
CS
Input Low Voltage
DIN, SCLK,
CS
Input Hysteresis
DIN, SCLK,
CS
Input Leakage
DIN, SCLK,
CS
Input Capacitance
SHDN
Input High Voltage
SHDN
Input Mid Voltage
SHDN
Voltage, Unconnected
SHDN
Input Low Voltage
SHDN
Input Current, High
SHDN
Input Current, Low
SHDN
Maximum Allowed Leakage,
Mid-Input
PARAMETER
SYMBOL
V
IH
V
IL
V
HYST
I
IN
C
IN
V
SH
V
SM
V
FLT
V
SL
I
SH
I
SL
SHDN
= V
DD
V
SHDN
= 0V
SHDN
= open
-4.0
-100
+100
SHDN
= open
V
IN
= 0V or V
DD
(Note 6)
V
DD
- 0.5
1.5
V
DD
- 1.5
2.75
0.5
4.0
0.15
±1
15
CONDITIONS
MIN
2.0
0.8
TYP
MAX
UNITS
V
V
V
µA
pF
V
V
V
V
µA
µA
nA
DIGITAL OUTPUTS—DOUT, SSTR (V
L
= 2.7V to 3.6V)
Output Voltage Low
Output Voltage High
Three-State Leakage Current
Three-State Output Capacitance
V
OL
V
OH
I
LEAK
C
OUT
I
SINK
= 3mA
I
SINK
= 6mA
I
SOURCE
= 1mA
CS
= V
L
CS
= V
L
(Note 6)
I
SINK
= 5mA
I
SINK
= 8mA
I
SOURCE
= 1mA
V
CS
= 5V
V
CS
= 5V (Note 6)
4
±10
15
0.3
V
L
- 0.5
±10
15
0.4
0.3
0.4
V
V
µA
pF
DIGITAL OUTPUTS—DOUT, SSTR (V
L
= 4.75V to 5.25V)
Output Voltage Low
Output Voltage High
Three-State Leakage Current
Three-State Output Capacitance
V
OL
V
OH
I
LEAK
C
OUT
V
V
µA
pF
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