Rainbow Electronics MAX1243 - Manual

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__________________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
♦ +2.7V to +5.25V Single-Supply Operation
♦ 10-Bit Resolution
♦ Internal 2.5V Reference (MAX1242)
♦ Small Footprint: 8-Pin DIP and SO Packages
♦ Low Power: 3.7mW (73ksps, MAX1242)
3mW (73ksps, MAX1243)
66µW (1ksps, MAX1243)
5µW (power-down mode)
♦ Internal Track/Hold
♦ SPI™/QSPI™/Microwire™ 3-Wire Serial Interface
♦ Pin-Compatible 12-Bit Upgrades:
MAX1240/MAX1241
MAX1242/MAX1243
+2.7V to +5.25V, Low-Power, 10-Bit
Serial ADCs in SO-8
________________________________________________________________ Maxim Integrated Products 1
19-1156; Rev 2; 6/98
SPI and QSPI are trademarks of Motorola, Inc. Microwire is a trademark of National Semiconductor Corp.
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
7
AIN T/H
DOUT
6
1
5
OUTPUT
SHIFT
REGISTER
CONTROL
LOGIC
2.5V
REFERENCE
MAX1242 ONLY
INT
CLOCK
10-BIT
SAR
8
2
3
REF
4
SHDN
SCLK
CS
MAX1242
MAX1243
V DD
GND
TOP VIEW
1
2
3
4
8
7
6
5
SCLK
CS
DOUT
GND REF
SHDN
AIN
V DD
DIP/SO
MAX1242
MAX1243
Pin Configuration
_________________Ordering Information
±1 8 Plastic DIP -40°C to +85°C MAX1242BEPA
± 1 / 2 8 Plastic DIP -40°C to +85°C MAX1242AEPA
± 1 / 2 8 SO 0°C to +70°C MAX1242ACSA
±1
±1
± 1 / 2
INL
(LSB)
8 SO
8 Plastic DIP
8 Plastic DIP
PIN-
PACKAGE
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C MAX1242BCSA
MAX1242BCPA
MAX1242 ACPA
PART