MAXIM INTEGRATED PRODUCTS MAX1236–MAX1239 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4- 12-Channel, 2-Wire Serial, 12-Bit ADCs User Manual

19-2333; Rev 4; 9/06

2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs General Description Features

The MAX1236–MAX1239 low-power, 12-bit, multichan- High-Speed I2C-Compatible Serial Interface nel analog-to-digital converters (ADCs) feature internal 400k Hz Fast Mode track/hold (T/H), voltage reference, clock, and an 1.7MHz High-Speed Mode I2C-compatible 2-wire serial interface. These devices

Single-Supply

operate from a single supply of 2.7V to 3.6V (MAX1237/

2.7V to 3.6V (MAX1237/MAX1239)

MAX1239) or 4.5V to 5.5V (MAX1236/MAX1238) and 4.5V to 5.5V (MAX1236/MAX1238) require only 670µA at the maximum sampling rate of

Internal Reference

94.4ksps. Supply current falls below 230µA for sam-

2.048V (MAX1237/MAX1239)

pling rates under 46ksps. Auto Shutdown™ powers

4.096V (MAX1236/MAX1238)

down the devices between conversions, reducing sup-

External Reference: 1V to VDD

ply current to less than 1µA at low throughput rates.

Internal Clock

The MAX1236/MAX1237 have four analog input chan-

4-Channel Single-Ended or 2-Channel Fully

nels each, while the MAX1238/MAX1239 have 12 ana-

Differential (MAX1236/MAX1237)

log input channels each. The fully differential analog

12-Channel Single-Ended or 6-Channel Fully

inputs are software configurable for unipolar or bipolar,

Differential (MAX1238/MAX1239)

and single-ended or differential operation.

Internal FIFO with Channel-Scan Mode

The full-scale analog input range is determined by the

Low Power

internal reference or by an externally applied reference

670µA at 94.4ksps

voltage ranging from 1V to VDD. The MAX1237/

230µA at 40ksps

MAX1239 feature a 2.048V internal reference and the

60µA at 10ksps

MAX1236/MAX1238 feature a 4.096V internal reference.

6µA at 1ksps

The MAX1236/MAX1237 are available in an 8-pin µMAX®

0.5µA in Power-Down Mode

package. The MAX1238/MAX1239 are available in a 16-

Software-Configurable Unipolar/Bipolar

pin QSOP package. The MAX1236–MAX1239 are guar-

Small Packages

anteed over the extended temperature range

8-Pin µMAX (MAX1236/MAX1237)

(-40°C to +85°C). For pin-compatible 10-bit parts, refer to

16-Pin QSOP (MAX1238/MAX1239)

the MAX1136–MAX1139 data sheet. For pin-compatible 8-bit parts, refer to the MAX1036–MAX1039 data sheet.

Ordering Information

Applications

PIN- I2C SLAVE

Hand-Held Portable Solar-Powered Remote

PART TEMP RANGE

PACKAGE ADDRESS

Applications Systems

Medical Instruments Received-Signal-Strength MAX1236EUA -40°C to +85°C 8 µMAX

Battery-Powered Test Indicators MAX1236KEUA -40°C to +85°C 8 µMAX

Equipment System Supervision MAX1236LEUA -40°C to +85°C 8 µMAX

MAX1236MEUA -40°C to +85°C 8 µMAX MAX1237EUA -40°C to +85°C 8 µMAX

Selector Guide

MAX1237KEUA -40°C to +85°C 8 µMAX MAX1237LEUA -40°C to +85°C 8 µMAX

INTERNAL SUPPLY

INPUT INL

PART REFERENCE VOLTAGE MAX1237MEUA -40°C to +85°C 8 µMAX

CHANNELS (LSB)

MAX1238EEE -40°C to +85°C 16 QSOP MAX1236 4.096 4.5 to 5.5 ±1 MAX1238KEEE -40°C to +85°C 16 QSOP MAX1237 2.048 2.7 to 3.6 ±1 MAX1238LEEE -40°C to +85°C 16 QSOP MAX1238 4.096 4.5 to 5.5 ±1 MAX1238MEEE -40°C to +85°C 16 QSOP

MAX1239 2.048 2.7 to 3.6 ±1

Ordering Information continued at end of data sheet. Pin Configurations and Typical Operating Circuit appear at

Auto Shutdown is a trademark of Maxim Integrated Products, Inc.

end of data sheet.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.