19-1156; Rev 2; 6/98
+2.7V to +5.25V, Low-Power, 10-Bit
Serial ADCs in SO-8
________________________________Features
The MAX1242/MAX1243 are low-power, 10-bit analogto-digital converters (ADCs) available in 8-pin packages. They operate with a single +2.7V to +5.25V
supply and feature a 7.5µs successive-approximation
ADC, a fast track/hold (1.5µs), an on-chip clock, and a
high-speed, 3-wire serial interface.
Power consumption is only 3mW (VDD = 3V) at the
73ksps maximum sampling speed. A 2µA shutdown
mode reduces power at slower throughput rates.
o +2.7V to +5.25V Single-Supply Operation
The MAX1242 has an internal 2.5V reference, while the
MAX1243 requires an external reference. The MAX1243
accepts signals from 0V to VREF, and the reference
input range includes the positive supply rail. An external clock accesses data from the 3-wire interface,
which connects directly to standard microcontroller I/O
ports. The interface is compatible with SPI™, QSPI™,
and Microwire™.
Excellent AC characteristics and very low power combined with ease of use and small package size make
these converters ideal for remote-sensor and dataacquisition applications, or for other circuits with
demanding power consumption and space requirements. The MAX1242/MAX1243 are available in 8-pin
DIP and SO packages.
o 10-Bit Resolution
o Internal 2.5V Reference (MAX1242)
o Small Footprint: 8-Pin DIP and SO Packages
o Low Power: 3.7mW (73ksps, MAX1242)
3mW (73ksps, MAX1243)
66µW (1ksps, MAX1243)
5µW (power-down mode)
o Internal Track/Hold
o SPI™/QSPI™/Microwire™ 3-Wire Serial Interface
o Pin-Compatible 12-Bit Upgrades:
MAX1240/MAX1241
_________________Ordering Information
Portable Data Logging
Process Control Monitoring
Test Equipment
Temperature Measurement
TEMP. RANGE
PINPACKAGE
INL
(LSB)
MAX1242ACPA
0°C to +70°C
8 Plastic DIP
±1/2
MAX1242BCPA
0°C to +70°C
8 Plastic DIP
±1
MAX1242ACSA
0°C to +70°C
8 SO
±1/2
MAX1242BCSA
0°C to +70°C
8 SO
±1
MAX1242AEPA
Applications
PART
-40°C to +85°C
8 Plastic DIP
±1/2
MAX1242BEPA
-40°C to +85°C
8 Plastic DIP
±1
Ordering Information continued at end of data sheet.
Note: Order the MAX1242A in place of the MAX1242C. Order the
MAX1242B in place of the MAX1242D.
Isolated Data Acquisition
________________Functional Diagram
Pin Configuration
VDD
1
CS
SCLK
TOP VIEW
SHDN
VDD
1
AIN
2
SHDN 3
8
DIP/SO
6
GND
INT
CLOCK
CONTROL
LOGIC
DOUT
5
REF 4
CS
3
SCLK
7
MAX1242
MAX1243
7
8
AIN
2
T/H
4
6
DOUT
10-BIT
SAR
2.5V
REFERENCE
REF
OUTPUT
SHIFT
REGISTER
MAX1242
MAX1243
MAX1242 ONLY
5
GND
SPI and QSPI are trademarks of Motorola, Inc. Microwire is a trademark of National Semiconductor Corp.
________________________________________________________________ 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 408-737-7600 ext. 3468.
MAX1242/MAX1243
__________________General Description
