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

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

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

Features

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 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)

2.7V to 3.6V and 4.5V to 5.5V, Low-Power,

4-/12-Channel, 2-Wire Serial, 12-Bit ADCs

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-2333; Rev 2; 2/03

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.

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.

PART

TEMP

RANGE

PIN-

PACKAGE

I

ADDRESS

INL

(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

AutoShutdown is a trademark of Maxim Integrated Products, Inc.

*Future product—contact factory for availability.

Selector Guide

PART

INPUT

CHANNELS

INTERNAL

REFERENCE

(V)

SUPPLY

VOLTAGE (V)

MAX1236EUA

4

4.096

4.5 to 5.5

MAX1237EUA

4

2.048

2.7 to 3.6

MAX1238EEE

12

4.096

4.5 to 5.5

MAX1239EEE

12

2.048

2.7 to 3.6