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General Description
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
SPITM/MICROWIRETM 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 10A 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.
Applications
5V/3V Mixed-Supply Systems
Data Acquisition
High-Accuracy Process Control
Battery-Powered Instruments
Medical Instruments
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)
2A (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
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
________________________________________________________________
Maxim Integrated Products
1
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
TOP VIEW
DIP/SSOP
V
DD
SCLK
CS
DIN
SSTRB
DOUT
VL
GND
REFADJ
REF
SHDN
V
SS
CH7
CH6
CH5
CH4
CH3
CH2
CH1
CH0
MAX1202
MAX1203
Pin Configuration
19-1173; Rev 2; 5/98
EVALUATION KIT
AVAILABLE
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.
Ordering Information continued at end of data sheet.
*
Dice are specified at T
A
= +25C, DC parameters only.
1
Dice*
0C to +70C
MAX1202BC/D
MAX1202BCAP
MAX1202ACAP
MAX1202BCPP
MAX1202
ACPP
PART
TEMP. RANGE
0C to +70C
0C to +70C
0C to +70C
0C to +70C
20 SSOP
20 SSOP
20 Plastic DIP
20 Plastic DIP
PIN-PACKAGE
INL
(LSB)
1/2
1
1/2
1
Ordering Information
MAX1202/MAX1203
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
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
CH0CH7 to GND ............................(V
SS
- 0.3V) to (V
DD
+ 0.3V)
CH0CH7 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
= +70C)
Plastic DIP (derate 11.11mW/C above +70C) ...........889mW
SSOP (derate 8.00mW/C above +70C) .....................640mW
CERDIP (derate 11.11mWC above +70C) .................889mW
Operating Temperature Ranges
MAX1202_C_P/MAX1203_C_P ............................0C to +70C
MAX1202_E_P/MAX1203_E_P..........................-40C to +85C
MAX1202BMJP/MAX1203BMJP .....................-55C to +125C
Storage Temperature Range .............................-60C to +150C
Lead Temperature (soldering, 10sec) .............................+300C
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--4.7F 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.)
-3dB rolloff
MHz
4.5
MAX1202A/MAX1203A
Small-Signal Bandwidth
kHz
800
V
IN
= 4.096Vp-p, 65kHz (Note 4)
External reference, 4.096V
MAX1202B/MAX1203B
No missing codes over temperature
CONDITIONS
Full-Power Bandwidth
3
MAX1202 (all grades)
dB
-85
Channel-to-Channel Crosstalk
dB
80
SFDR
Spurious-Free Dynamic Range
dB
-80
THD
Total Harmonic Distortion
(up to the 5th harmonic)
dB
70
SINAD
Signal-to-Noise + Distortion Ratio
LSB
0.5
INL
Relative Accuracy (Note 2)
Bits
12
Resolution
LSB
0.1
Channel-to-Channel
Offset Matching
ppm/C
0.8
Gain Temperature Coefficient
1.0
LSB
1.0
DNL
Differential Nonlinearity
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
LSB
3.0
Offset Error
1.5
LSB
3
Gain Error (Note 3)
External reference, 4.096V
MAX1203A
MAX1203B
DC ACCURACY
(Note 1)
DYNAMIC SPECIFICATIONS
(10kHz sine-wave input, 4.096Vp-p, 133ksps, 2.0MHz external clock, bipolar-input mode)
MAX1202/MAX1203
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
_______________________________________________________________________________________
3
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--4.7F 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.)
MAX1202AC
T
A
= +25C
External clock, 2MHz, 12 clocks/conversion
(Note 6)
On/off leakage current, V
CH_
= 5V
Bipolar, V
SS
= -5V
Unipolar, V
SS
= 0V
6
Used for data transfer only
Internal compensation mode (Note 6)
Internal clock
MAX1202AE
External compensation mode
External compensation mode, 4.7F
30
60
CONDITIONS
ppm/C
30
50
V
REF
Temperature Coefficient
mA
30
REF Short-Circuit Current
V
4.076
4.096
4.116
REF Output Voltage
pF
16
Input Capacitance
A
0.01
1
Multiplexer Leakage Current
V
REF
/ 2
4.7
V
V
REF
Input Voltage Range, Single-
Ended and Differential (Note 7)
0
2.0
30
0.1
0.4
MAX1202B
F
MHz
0.1
2.0
External Clock Frequency Range
MHz
1.7
Internal Clock Frequency
0.01
0mA to 0.5mA output load
mV
2.5
Load Regulation (Note 8)
ns
10
Aperture Delay
s
1.5
t
ACQ
Track/Hold Acquisition Time
s
5.5
10
t
CONV
Conversion Time (Note 5)
Internal compensation mode
F
0
Capacitive Bypass at REF
Capacitive Bypass at REFADJ
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
ps
%
1.5
REFADJ Adjustment Range
V
2.50
V
DD
+
50mV
Input Voltage Range
A
200
350
Input Current
k
12
20
Input Resistance
SHDN = 0V
A
1.5
10
REF Input Current in Shutdown
V
V
DD
-
50mV
REFADJ Buffer Disable Threshold
<50
Aperture Jitter
CONVERSION RATE
INTERNAL REFERENCE
(MAX1202 only, reference-buffer enabled)
ANALOG INPUT
EXTERNAL REFERENCE AT REF
(Reference buffer disabled, V
REF
= 4.096V)
A
MAX1202/MAX1203
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
4
_______________________________________________________________________________________
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--4.7F 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.)
Operating mode
mA
1.5
2.5
Internal compensation mode
V
DD
= 5V 5%; external reference, 4.096V;
full-scale input
mV
0.06
0.5
V
Fast power-down (Note 9)
30
70
External compensation mode
MAX1202
MAX1202
CONDITIONS
2.70
5.25
VL
Logic Supply Voltage
VL = V
DD
= 5V
A
10
I
VL
Logic Supply Current (Notes 6, 10)
PSR
Positive Supply Rejection
(Note 11)
V
SS
= -5V 5%; external reference, 4.096V;
full-scale input
mV
0.01
0.5
PSR
Negative Supply Rejection
(Note 11)
External reference, 4.096V; full-scale input
mV
0.06
0.5
PSR
Logic Supply Rejection
(Note 12)
A
F
0
Capacitive Bypass at REF
V
0 or -5 5%
V
SS
Negative Supply Voltage
V
5 5%
V
DD
Positive Supply Voltage
4.7
1.68
50
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
MAX1203
V/V
1.64
Reference-Buffer Gain
MAX1203
A
5
REFADJ Input Current
Full power-down
10
Operating mode and fast power-down
A
50
I
SS
Negative Supply Current
Full power-down (Note 9)
A
I
DD
2
10
Positive Supply Current
EXTERNAL REFERENCE AT REFADJ
POWER REQUIREMENTS
MAX1202/MAX1203
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
_______________________________________________________________________________________
5
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--4.7F 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.)
CS = VL (Note 6)
CS = VL
I
SOURCE
= 1mA
I
SINK
= 3mA
SHDN = open
SHDN = 0V
SHDN = V
DD
(Note 6)
V
IN
= 0V or V
DD
SHDN = open
I
SINK
= 5mA
CONDITIONS
pF
15
C
OUT
Three-State Output Capacitance
A
10
I
L
Three-State Leakage Current
V
VL - 0.5
V
OH
Output Voltage High
V
0.4
V
OL
Output Voltage Low
nA
-100
100
SHDN Maximum Allowed
Leakage, Mid-Input
V
2.75
V
FLT
SHDN Voltage, Floating
A
-4.0
I
SL
SHDN Input Current, Low
A
4.0
I
SH
SHDN Input Current, High
V
V
DD
- 0.5
V
SH
SHDN Input High Voltage
V
0.4
V
OL
Output Voltage Low
V
0.8
V
IL
V
2.0
V
IH
DIN, SCLK, CS Input High Voltage
DIN, SCLK, CS Input Low Voltage
I
SINK
= 8mA
0.3
V
1.5
V
DD
- 1.5
I
SINK
= 6mA
V
SM
0.3
pF
15
C
IN
DIN, SCLK, CS Input Capacitance
A
1
I
IN
DIN, SCLK, CS Input Leakage
SHDN Input Mid-Voltage
I
SOURCE
= 1mA
V
V
0.15
V
HYST
DIN, SCLK, CS Input Hysteresis
4
V
OH
Output Voltage High
CS = 5V
A
10
I
L
Three-State Leakage Current
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
CS = 5V (Note 6)
pF
15
C
OUT
Three-State Output Capacitance
V
0.5
V
SL
SHDN Input Low Voltage
DIGITAL INPUTS: DIN, SCLK,
C
CS
S
,
S
SH
HD
DN
N
DIGITAL OUTPUTS: DOUT, SSTRB
(VL = 2.7V to 3.6V)
DIGITAL OUTPUTS: DOUT, SSTRB
(VL = 4.75V to 5.25V)
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