MAX1236 Datasheet, PDF (1/22 Pages) Maxim Integrated Products – 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs

19-2333; Rev 2; 2/03
2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/12-Channel, 2-Wire Serial, 12-Bit ADCs
General Description
The MAX1236–MAX1239 low-power, 12-bit, multichan-
nel analog-to-digital converters (ADCs) feature internal
track/hold (T/H), voltage reference, clock, and an
I²C-compatible 2-wire serial interface. These devices
operate from a single supply of 2.7V to 3.6V (MAX1237/
MAX1239) or 4.5V to 5.5V (MAX1236/MAX1238) and
require only 670µA at the maximum sampling rate of
94.4ksps. Supply current falls below 230µA for sam-
pling rates under 46ksps. AutoShutdown™ powers
down the devices between conversions, reducing sup-
ply current to less than 1µA at low throughput rates.
The MAX1236/MAX1237 have four analog input chan-
nels each, while the MAX1238/MAX1239 have 12 ana-
log input channels each. The fully differential analog
inputs are software configurable for unipolar or bipolar,
and single-ended or differential operation.
The full-scale analog input range is determined by the
internal reference or by an externally applied reference
voltage ranging from 1V to V_DD. The MAX1237/
MAX1239 feature a 2.048V internal reference and the
MAX1236/MAX1238 feature a 4.096V internal reference.
The MAX1236/MAX1237 are available in an 8-pin µMAX
package. The MAX1238/MAX1239 are available in a 16-
pin QSOP package. The MAX1236–MAX1239 are guar-
anteed over the extended temperature range
(-40°C to +85°C). For pin-compatible 10-bit parts, refer to
the MAX1136–MAX1139 data sheet. For pin-compatible
8-bit parts, refer to the MAX1036–MAX1039 data sheet.
Applications
Hand-Held Portable Applications
Medical Instruments
Battery-Powered Test Equipment
Solar-Powered Remote Systems
Received-Signal-Strength Indicators
System Supervision
Selector Guide
PART
MAX1236EUA
MAX1237EUA
MAX1238EEE
MAX1239EEE
INPUT
CHANNELS
4
4
12
12
INTERNAL
REFERENCE
(V)
SUPPLY
VOLTAGE (V)
4.096
4.5 to 5.5
2.048
2.7 to 3.6
4.096
4.5 to 5.5
2.048
2.7 to 3.6
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
Features
o High-Speed I²C-Compatible Serial Interface
400kHz Fast Mode
1.7MHz High-Speed Mode
o Single-Supply
2.7V to 3.6V (MAX1237/MAX1239)
4.5V to 5.5V (MAX1236/MAX1238)
o Internal Reference
2.048V (MAX1237/MAX1239)
4.096V (MAX1236/MAX1238)
o External Reference: 1V to V_DD
o Internal Clock
o 4-Channel Single-Ended or 2-Channel Fully
Differential (MAX1236/MAX1237)
o 12-Channel Single-Ended or 6-Channel Fully
Differential (MAX1238/MAX1239)
o Internal FIFO with Channel-Scan Mode
o Low Power
670µA at 94.4ksps
230µA at 40ksps
60µA at 10ksps
6µA at 1ksps
0.5µA in Power-Down Mode
o Software-Configurable Unipolar/Bipolar
o Small Packages
8-Pin µMAX (MAX1236/MAX1237)
16-Pin QSOP (MAX1238/MAX1239)
Ordering Information
PART
TEMP
RANGE
PIN- I²C SLAVE INL
PACKAGE ADDRESS (LSB)
MAX1236EUA -40°C to +85°C 8 µMAX 0110100 ±1
MAX1236KEUA* -40°C to +85°C 8 µMAX 0110000 ±1
MAX1236LEUA* -40°C to +85°C 8 µMAX 0110010 ±1
MAX1236MEUA* -40°C to +85°C 8 µMAX 0110110 ±1
MAX1237EUA -40°C to +85°C 8 µMAX 0110100 ±1
MAX1237KEUA* -40°C to +85°C 8 µMAX 0110000 ±1
MAX1237LEUA* -40°C to +85°C 8 µMAX 0110010 ±1
MAX1237MEUA* -40°C to +85°C 8 µMAX 0110110 ±1
*Future product—contact factory for availability.
Ordering Information continued at end of data sheet.
Pin Configurations appear at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
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