Document
19-2333; Rev 7; 5/10
MAX1236–MAX1239
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, 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 VDD. 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 16pin 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.
Applications
Handheld Portable Applications Medical Instruments Battery-Powered Test Equipment
Solar-Powered Remote Systems Received-Signal-Strength Indicators System Supervision
Selector Guide
PART
INPUT CHANNELS
INTERNAL REFERENCE
(V)
SUPPLY VOLTAGE
(V)
INL (LSB)
MAX1236 MAX1237 MAX1238 MAX1239
4 4 12 12
4.096 2.048 4.096 2.048
4.5 to 5.5 2.7 to 3.6 4.5 to 5.5 2.7 to 3.6
±1 ±1 ±1 ±1
Features
♦ 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 VDD ♦ 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)
Ordering Information
PART
TEMP RANGE PIN-
I2C SLAVE
PACKAGE ADDRESS
MAX1236EUA+ -40°C to +85°C 8 µMAX
0110100
MAX1237EUA+ -40°C to +85°C 8 µMAX
0110100
MAX1238EEE+ -40°C to +85°C 16 QSOP MAX1238EEE/V+ -40°C to +85°C 16 QSOP
0110101 0110101
MAX1239EEE+ -40°C to +85°C 16 QSOP 0110101
+Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive qualified part.
AutoShutdown is a trademark of Maxim Integrated Products, Inc. µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configurations and Typical Operating Circuit appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX1236–MAX1239
2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs
ABSOLUTE MAXIMUM RATINGS
VDD to GND ..............................................................-0.3V to +6V AIN0–AIN11,
REF to GND ............-0.3V to the lower of (VDD + 0.3V) and 6V SDA, SCL to GND.....................................................-0.3V to +6V Maximum Current Into Any Pin .........................................±50mA Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 5.9mW/°C above +70°C) ..........470.6mW 16-Pin QSOP (derate 8.3mW/°C above +70°C)........666.7mW
Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-60°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = 2.7V to 3.6V (MAX1237/MAX1239), VDD = 4.5V to 5.5V (MAX1236/MAX1238), VREF = 2..