19-1156; Rev 2; 6/98
+2 .7 V t o +5 .2 5 V, Lo w -P o w e r, 1 0 -Bit
S e ria l ADCs in S O-8
/MAX1243
__________________Ge n e ra l De s c rip t io n
________________________________Fe a t u re s
♦ +2.7V to +5.25V Single-Supply Operation
♦ 10-Bit Resolution
The MAX1242/MAX1243 are low-power, 10-bit analog-
to-digital converters (ADCs) available in 8-pin pack-
a g e s . The y op e ra te with a s ing le +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.
♦ Internal 2.5V Reference (MAX1242)
♦ Small Footprint: 8-Pin DIP and SO Packages
♦ Low Power: 3.7mW (73ksps, MAX1242)
3mW (73ksps, MAX1243)
Power consumption is only 3mW (V
= 3V) at the
DD
73ksps maximum sampling speed. A 2µA shutdown
mode reduces power at slower throughput rates.
66µW (1ksps, MAX1243)
5µW (power-down mode)
The MAX1242 has an internal 2.5V reference, while the
MAX1243 requires an external reference. The MAX1243
♦ Internal Track/Hold
accepts signals from 0V to V
, and the reference
REF
♦ SPI™/QSPI™/Microwire™ 3-Wire Serial Interface
input range includes the positive supply rail. An exter-
na l c loc k a c c e s s e s d a ta from the 3-wire inte rfa c e ,
which connects directly to standard microcontroller I/O
ports. The interface is compatible with SPI™, QSPI™,
and Microwire™.
♦ Pin-Compatible 12-Bit Upgrades:
MAX1240/MAX1241
_________________Ord e rin g In fo rm a t io n
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-
a c q uis ition a p p lic a tions , or for othe r c irc uits with
demanding power consumption and space require-
ments. The MAX1242/MAX1243 are available in 8-pin
DIP and SO packages.
PIN-
PACKAGE
INL
(LSB)
±1/2
PART
TEMP. RANGE
MAX1242ACPA
MAX1242BCPA
MAX1242ACSA
MAX1242BCSA
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
8 Plastic DIP
8 Plastic DIP
8 SO
±1
±1/2
±1
8 SO
MAX1242AEPA -40°C to +85°C
MAX1242BEPA -40°C to +85°C
8 Plastic DIP
8 Plastic DIP
±1/2
±1
Ap p lic a t io n s
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.
Portable Data Logging
Test Equipment
Isolated Data Acquisition
________________Fu n c t io n a l Dia g ra m
P in Co n fig u ra t io n
V
DD
1
7
CS
8
SCLK
TOP VIEW
3
CONTROL
LOGIC
INT
CLOCK
SHDN
OUTPUT
SHIFT
REGISTER
6
DOUT
V
DD
SCLK
8
1
2
3
4
AIN
SHDN
REF
CS
7
6
5
2
10-BIT
SAR
T/H
AIN
MAX1242
MAX1243
DOUT
GND
2.5V
REFERENCE
MAX1242
MAX1243
MAX1242 ONLY
4
DIP/SO
REF
5
GND
SPI and QSPI are trademarks of Motorola, Inc. Microwire is a trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products
1
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For small orders, phone 408-737-7600 ext. 3468.