MAX1236, MAX1236K, MAX1236L, MAX1236M, MAX1237, MAX1237K, MAX1237L, MAX1237M, MAX1238, MAX1238K, MAX1238L, MAX1238M, MAX1239, MAX1239K, MAX1239L, MAX1239M 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs

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The MAX1236–MAX1239 low-power, 12-bit, multichannel 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 sampling rates under 46ksps. AutoShutdown™ powers down the devices between conversions, reducing supply current to less than 1µA at low throughput rates. The MAX1236/MAX1237 have four analog input channels each, while the MAX1238/MAX1239 have 12 analog 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 guaranteed 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.

Key Features

Applications/Uses

High-Speed I²C-Compatible Serial Interface
- 400kHz Fast Mode
- 1.7MHz High-Speed Mode
Single-Supply
- 2.7V to 3.6V (MAX1237/MAX1239)
- 4.5V to 5.5V (MAX1236/MAX1238)
Internal Reference
- 2.048V (MAX1237/MAX1239)
- 4.096V (MAX1236/MAX1238)
External Reference: 1V to V_DD
Internal Clock
4-Channel Single-Ended or 2-Channel Fully Differential (MAX1236/MAX1237)
12-Channel Single-Ended or 6-Channel Fully Differential (MAX1238/MAX1239)
Internal FIFO with Channel-Scan Mode
Low Power
- 670µA at 94.4ksps
- 230µA at 40ksps
- 60µA at 10ksps
- 6µA at 1ksps
- 0.5µA in Power-Down Mode
Software-Configurable Unipolar/Bipolar
Small Packages
- 8-Pin µMAX (MAX1236/MAX1237)
- 16-Pin QSOP (MAX1238/MAX1239)

	Battery-Powered Test Equipment
	Handheld Portable Applications
	Medical Instruments
	Receive Signal Strength Indicators
	Solar-Powered Remote Systems
	System Supervision

Key Specifications: Precision ADCs (< 5Msps)

Part Number

ADC Resolution (Bits)

Input Channels

Conv. Rate (ksps)

Max. Conv. Time (µs)

Data Bus (Bits)

Ref. (V)

Diff. In

Supply Voltage (V)

Typ. Supply Current (mA)

Typ. Power (mW)

Low Power Mode

Standby Mode

EV-Kit

RoHS Available

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX1236

94.4

6.8

I2C Compatible

Int +4.096

Yes

0.67

3.35

Yes

uMAX/8

-40 to +85

$3.85 @ 1k

MAX1237

Int +2.048

3
3.3

uMAX/8

$3.85 @ 1k

MAX1238

Int +4.096

3.35

QSOP/16

$4.19 @ 1k

MAX1239

Int +2.048

3
3.3

QSOP/16

$4.19 @ 1k

See All Precision ADCs (< 5Msps) (302)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.