MAX1242 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – +2.7V to %.25V, Low-Power, 10-Bit Serial ADCs in SO-8

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.
Applications
Portable Data Logging Process Control Monitoring
Test Equipment
Temperature Measurement
Isolated Data Acquisition
________________________________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
_________________Ordering Information
PART
MAX1242ACPA
TEMP. RANGE
PIN-
PACKAGE
0°C to +70°C 8 Plastic DIP
INL
(LSB)
±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 -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.
________________Functional Diagram
TOP VIEW
Pin Configuration
V_{DD 1}
AIN 2
SHDN 3
REF 4
MAX1242
MAX1243
8 SCLK
7 CS
6 DOUT
5 GND
DIP/SO
CS ⁷
SCLK ⁸
SHDN ³
AIN ²
4
REF
V_DD
1
CONTROL
LOGIC
T/H
2.5V
REFERENCE
MAX1242 ONLY
INT
CLOCK
10-BIT
SAR
OUTPUT
SHIFT
REGISTER
MAX1242
MAX1243
5
GND
SPI and QSPI are trademarks of Motorola, Inc. Microwire is a trademark of National Semiconductor Corp.
6
DOUT
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