19-1173; Rev 2; 5/98
KIT
ATION
EVALU
ABLE
AVAIL
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
The MAX1202/MAX1203 are 12-bit data-acquisition
systems 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 successiveapproximation 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 powerdown 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 commercial, extended, and military temperature ranges.
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
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX1202ACPP
0°C to +70°C
20 Plastic DIP
±1/2
MAX1202BCPP
MAX1202ACAP
MAX1202BCAP
MAX1202BC/D
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
20 Plastic DIP
20 SSOP
20 SSOP
Dice*
±1
±1/2
±1
±1
Ordering Information continued at end of data sheet.
*Dice are specified at TA = +25°C, DC parameters only.
Pin Configuration
TOP VIEW
CH0
Applications
INL
(LSB)
1
20 VDD
19 SCLK
18 CS
CH1
2
5V/3V Mixed-Supply Systems
CH2
3
Data Acquisition
CH3
4
High-Accuracy Process Control
CH4
5
Battery-Powered Instruments
CH5
6
15 DOUT
Medical Instruments
CH6
7
14 VL
CH7
8
13 GND
VSS
9
12 REFADJ
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.
MAX1202
MAX1203
17 DIN
16 SSTRB
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.
MAX1202/MAX1203
General Description
