MAX1238, MAX1238K, MAX1238L, MAX1238M:2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs

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 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
  • 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)
MAX1236, MAX1237, MAX1238, MAX1239: Typical Operating Circuit
MAX1236, MAX1237, MAX1238, MAX1239: Typical Operating Circuit
Applications/Uses
  • Battery-Powered Test Equipment
  • Handheld Portable Applications
  • Medical Instruments
  • Received-Signal-Strength Indicators
  • Solar-Powered Remote Systems
  • System Supervision
DataSheet
titleDownload file
MAX1236-MAX1239M Data SheetMAX1236-MAX1239M.pdf
Parametrics
Part NumberResolution
(bits)
Input Chan.Conv. Rate
(ksps)
ADC ArchitectureData BusDiff/S.E. InputInternal VREF
(V)
External VREF
(V)
External VREF
(V)
Unipolar VIN
(V)
Bipolar VIN
(±V)
SNR
(dB)
THD
(dB)
INL
(±LSB)
Package/PinsBudgetary
Price
ADCmaxnominalminmaxmaxmaxSee Notes
MAX123612494.4SARI2CBoth4.09615.54.0962.04870-781µMAX/8$4.82 @1k
MAX123742.0483.62.0481.024µMAX/8$6.08 @1k
MAX1238124.0965.54.0962.048QSOP/16$8.01 @1k
MAX1239122.0483.62.0481.024QSOP/16$8.01 @1k
Design kits & evaluation modules
Quality and Environmental Data
Related Products
  • MAX11645:Low-Power, 1-/2-Channel, I²C, 12-Bit ADCs in Ultra-Tiny 1.9mm x 2.2mm Package
  • MAX11613:Low-Power, 4-/8-/12-Channel, I²C, 12-Bit ADCs in Ultra-Small Packages
  • MAX1089:150ksps, 10-Bit, 2-Channel Single-Ended, and 1-Channel True-Differential ADCs in SOT23 and TDFN
  • MAX1087:150ksps, 10-Bit, 2-Channel Single-Ended, and 1-Channel True-Differential ADCs in SOT23 and TDFN
  • MAX1088:150ksps, 10-Bit, 2-Channel Single-Ended, and 1-Channel True-Differential ADCs in SOT23 and TDFN
  • MAX1086:150ksps, 10-Bit, 2-Channel Single-Ended, and 1-Channel True-Differential ADCs in SOT23 and TDFN
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX1238EEENo Longer AvailableMAX1238EEE+QSOP,;16 pin;30.9 mm²-40°C to +85°CNo
MAX1238EEE+ActiveQSOP,;16 pin;30.9 mm²-40°C to +85°CLead Free
MAX1238EEE+TActiveQSOP,;16 pin;30.9 mm²-40°C to +85°CLead Free
MAX1238EEE-TNo Longer AvailableMAX1238EEE+TQSOP;16 pin-40°C to +85°CSee data sheet
MAX1238EEE/V+No Longer AvailableMAX1238EEE+QSOP,;16 pin;30.9 mm²-40°C to +85°CLead Free
MAX1238EEE/V+TNo Longer AvailableMAX1238EEE+TQSOP,;16 pin;30.9 mm²-40°C to +85°CLead Free
MAX1238KEEENo Longer AvailableMAX1238EEE+QSOP,;16 pin;30.9 mm²-40°C to +85°CNo
MAX1238KEEE+No Longer AvailableMAX1238EEE+QSOP,;16 pin;30.9 mm²-40°C to +85°CLead Free
MAX1238KEEE+TNo Longer AvailableMAX1238EEE+QSOP;16 pin-40°C to +85°CSee data sheet
MAX1238KEEE-TNo Longer AvailableMAX1238EEE+QSOP;16 pin-40°C to +85°CSee data sheet
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX1238LEEENo Longer AvailableMAX1238EEE+QSOP,;16 pin;30.9 mm²-40°C to +85°CNo
MAX1238LEEE+No Longer AvailableMAX1238EEE+QSOP,;16 pin;30.9 mm²-40°C to +85°CLead Free
MAX1238LEEE+TNo Longer AvailableMAX1238EEE+QSOP;16 pin-40°C to +85°CSee data sheet
MAX1238LEEE-TNo Longer AvailableMAX1238EEE+QSOP;16 pin-40°C to +85°CSee data sheet
MAX1238MEEENo Longer AvailableMAX1238EEE+QSOP,;16 pin;30.9 mm²-40°C to +85°CNo
MAX1238MEEE+No Longer AvailableMAX1238EEE+QSOP,;16 pin;30.9 mm²-40°C to +85°CLead Free
MAX1238MEEE+TNo Longer AvailableMAX1238EEE+QSOP;16 pin-40°C to +85°CSee data sheet
MAX1238MEEE-TNo Longer AvailableMAX1238EEE+QSOP;16 pin-40°C to +85°CSee data sheet
MAX1236-MAX1239M.pdf MAX1239
High-Speed I²C for the MAX1239 ADC Using the MAXQ2000 Microcontroller MAX1239
MAX1238.pdf MAX1238
MAX1236-MAX1239M.pdf MAX1239M