19-1173; Rev 2; 5/98
KIT
ATION
EVALU
BLE
AVAILA
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
General Description
Features
o
8-Channel Single-Ended or 4-Channel
Differential Inputs
o
Operates from Single +5V or Dual ±5V Supplies
o
User-Adjustable Output Logic Levels
(2.7V to 5.25V)
o
Low Power: 1.5mA (operating mode)
2µA (power-down mode)
o
Internal Track/Hold, 133kHz Sampling Rate
o
Internal 4.096V Reference (MAX1202)
o
SPI/MICROWIRE/TMS320-Compatible
4-Wire Serial Interface
o
Software-Configurable Unipolar/Bipolar Inputs
o
20-Pin DIP/SSOP
MAX1202/MAX1203
The MAX1202/MAX1203 are 12-bit data-acquisition
systems specifically designed for use in applications
with mixed +5V (analog) and +3V (digital) supply volt-
ages. 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 inter-
face with high conversion speed and low power con-
sumption.
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 conversions. 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 VL 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 DIP packages, and are specified for the commer-
cial, extended, and military temperature ranges.
Ordering Information
PART
MAX1202ACPP
MAX1202BCPP
MAX1202ACAP
MAX1202BCAP
MAX1202BC/D
TEMP. RANGE PIN-PACKAGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
20 Plastic DIP
20 Plastic DIP
20 SSOP
20 SSOP
Dice*
INL
(LSB)
±1/2
±1
±1/2
±1
±1
Ordering Information continued at end of data sheet.
*Dice
are specified at T
A
= +25°C, DC parameters only.
Pin Configuration
TOP VIEW
CH0
1
2
3
4
5
6
7
8
9
20 V
DD
19 SCLK
18 CS
Applications
5V/3V Mixed-Supply Systems
Data Acquisition
High-Accuracy Process Control
Battery-Powered Instruments
Medical Instruments
Typical Operating Circuit appears at end of data sheet.
SPI is a registered trademark of Motorola, Inc.
MICROWIRE is a registered trademark of National
Semiconductor Corp.
CH1
CH2
CH3
CH4
CH5
CH6
CH7
V
SS
MAX1202
MAX1203
17 DIN
16 SSTRB
15 DOUT
14 VL
13 GND
12 REFADJ
11 REF
SHDN 10
DIP/SSOP
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
MAX1202/MAX1203
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ................................................................-0.3V to 6V
VL ...............................................................-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 (VL + 0.3V)
Digital Output Sink Current .................................................25mA
Continuous Power Dissipation (T
A
= +70°C)
Plastic DIP (derate 11.11mW/°C above +70°C) ...........889mW
SSOP (derate 8.00mW/°C above +70°C) .....................640mW
CERDIP (derate 11.11mW°C above +70°C) .................889mW
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
MAX1202BMJP/MAX1203BMJP .....................-55°C to +125°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°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%, VL = 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 + 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
= 4.096Vp-p, 65kHz (Note 4)
-3dB rolloff
80
-85
4.5
800
70
-80
External reference, 4.096V
External reference, 4.096V
MAX1203A
MAX1203B
±0.8
±0.1
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
LSB
Bits
LSB
LSB
LSB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DYNAMIC SPECIFICATIONS
(10kHz sine-wave input, 4.096Vp-p, 133ksps, 2.0MHz external clock, bipolar-input mode)
dB
dB
dB
dB
MHz
kHz
2
_______________________________________________________________________________________
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
MAX1202/MAX1203
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V ±5%, VL = 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 Coefficient
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
SHDN
= 0V
V
DD
-
50mV
12
2.50
200
20
1.5
10
V
DD
+
50mV
350
V
µA
kΩ
µA
V
MAX1202AE
MAX1202B
0mA 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
±0.01
16
4.096
4.116
30
±50
±60
ppm/°C
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)
_______________________________________________________________________________________
3
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
MAX1202/MAX1203
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V ±5%, VL = 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
VL
I
VL
PSR
PSR
PSR
VL = 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
µF
V/V
µA
µA
V
V
mA
µA
µA
µA
V
µA
mV
mV
mV
4
_______________________________________________________________________________________
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
MAX1202/MAX1203
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V ±5%, VL = 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
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, Floating
SHDN
Input Low Voltage
SHDN
Input Current, High
SHDN
Input Current, Low
SHDN
Maximum Allowed
Leakage, Mid-Input
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
SHDN
= 0V
SHDN
= open
-4.0
-100
100
SHDN
= open
V
IN
= 0V or V
DD
(Note 6)
V
DD
- 0.5
1.5
2.75
0.5
4.0
V
DD
- 1.5
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 INPUTS: DIN, SCLK,
CS
,
SHDN
DIGITAL OUTPUTS: DOUT, SSTRB
(VL = 2.7V to 3.6V)
Output Voltage Low
Output Voltage High
Three-State Leakage Current
Three-State Output Capacitance
V
OL
V
OH
I
L
C
OUT
I
SINK
= 3mA
I
SINK
= 6mA
I
SOURCE
= 1mA
CS
= VL
CS
= VL (Note 6)
I
SINK
= 5mA
I
SINK
= 8mA
I
SOURCE
= 1mA
CS
= 5V
CS
= 5V (Note 6)
4
±10
15
0.3
VL - 0.5
±10
15
0.4
0.3
0.4
V
V
µA
pF
DIGITAL OUTPUTS: DOUT, SSTRB
(VL = 4.75V to 5.25V)
Output Voltage Low
Output Voltage High
Three-State Leakage Current
Three-State Output Capacitance
V
OL
V
OH
I
L
C
OUT
V
V
µA
pF
_______________________________________________________________________________________
5
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