+2.7V, Low-Power, 12-Bit Serial ADCs in 8-Pin SO

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The MAX1240/MAX1241 low-power, 12-bit analog-to-digital converters (ADCs) are available in 8-pin packages. The MAX1240 operates with a single +2.7V to +3.6V supply, and the MAX1241 operates with a single +2.7V to +5.25V supply. Both devices feature a 7.5µs successive-approximation ADC, a fast track/hold (1.5µs), an on-chip clock, and a high-speed, 3-wire serial interface.

Power consumption is only 37mW (VDD = 3V) at the 73ksps maximum sampling speed. A 2µA shutdown mode reduces power at slower throughput rates.

The MAX1240 has an internal 2.5V reference, while the MAX1241 requires an external reference. The MAX1241 accepts signals from 0V to VREF, and the reference input range includes the positive supply rail. An external clock accesses data from the 3-wire interface, which connects directly to standard microcontroller I/O ports. The interface is compatible with SPI™, QSPI™, and MICROWIRE™.

Excellent AC characteristics and very low power combined with ease of use and small package size make these converters ideal for remote-sensor and data-acquisition applications, or for other circuits with demanding power consumption and space requirements. The MAX1240/MAX1241 are available in 8-pin PDIP and SO packages.
MAX1240, MAX1241: Functional Diagram MAX1240, MAX1241: Functional Diagram Enlarge+

Key Features

  • Single-Supply Operation:
    • +2.7V to +3.6V (MAX1240)
    • +2.7V to +5.25V (MAX1241)
  • 12-Bit Resolution
  • Internal 2.5V Reference (MAX1240)
  • Small Footprint: 8-Pin PDIP/SO Packages
  • Low Power: 3.7µW (73ksps, MAX1240)
    • 3mW (73ksps, MAX1241)
    • 66µW (1ksps, MAX1241)
    • 5µW (power-down mode)
  • Internal Track/Hold
  • SPI/QSPI/MICROWIRE 3-Wire Serial Interface
  • Internal Clock


  • Battery-Powered Applications
  • Instrumentation
  • Isolated Data Acquisition
  • Portable Data Logging
  • Process Control

See parametric specs for Precision ADCs (< 5Msps) (432)

Part NumberResolution
Input ChannelsConv. Rate
ADC ArchitectureData BusDiff/S.E. InputInternal VREF
External VREF
External VREF
Unipolar VIN
ADCmaxnominalminmaxmaxSee Notes
MAX1240 12173SARSPIS.E. Only2.513.62.570-881
SOIC (N)/8
$7.87 @1k
MAX1241 -5.25
SOIC (N)/8
$5.72 @1k

Pricing 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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX1240EVKIT: Evaluation Kit for the MAX1240/MAX1241
MAX1240PMB: Evaluation Kit for the MAX1240/MAX1241
Product Reliability Reports: MAX1240.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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