19-1156; Rev 2; 6/98
+2.7V to +5.25V, Low-Power, 10-Bit
Serial ADCs in SO-8
__________________General Description
The MAX1242/MAX1243 are low-power, 10-bit analog-
to-digital converters (ADCs) available in 8-pin pack-
ages. 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 (V
DD
= 3V) at the
73ksps maximum sampling speed. A 2µA shutdown
mode reduces power at slower throughput rates.
The MAX1242 has an internal 2.5V reference, while the
MAX1243 requires an external reference. The MAX1243
accepts signals from 0V to V
REF
, and the reference
input range includes the positive supply rail. An exter-
nal 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 com-
bined with ease of use and small package size make
these converters ideal for remote-sensor and data-
acquisition applications, or for other circuits with
demanding power consumption and space require-
ments. The MAX1242/MAX1243 are available in 8-pin
DIP and SO packages.
________________________________Features
o
+2.7V to +5.25V Single-Supply Operation
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
MAX1242/MAX1243
_________________Ordering Information
PART
MAX1242ACPA
MAX1242BCPA
MAX1242ACSA
MAX1242BCSA
MAX1242AEPA
MAX1242BEPA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
8 Plastic DIP
8 Plastic DIP
8 SO
8 SO
8 Plastic DIP
8 Plastic DIP
INL
(LSB)
±
1
/
2
±1
±
1
/
2
±1
±
1
/
2
±1
Applications
Portable Data Logging
Test Equipment
Isolated Data Acquisition
Process Control Monitoring
Temperature Measurement
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.
________________Functional Diagram
Pin Configuration
CS
7
8
3
CONTROL
LOGIC
INT
CLOCK
V
DD
1
SCLK
SHDN
TOP VIEW
V
DD
AIN
1
2
8
7
SCLK
CS
AIN
2
T/H
2.5V
REFERENCE
REF
4
MAX1242 ONLY
5
GND
10-BIT
SAR
OUTPUT
SHIFT
REGISTER
6
DOUT
SHDN 3
REF 4
MAX1242
MAX1243
6
5
DOUT
GND
MAX1242
MAX1243
DIP/SO
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.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
