The MAX1231BEEG+T is the 16-channel member of Maxim's MAX1227/MAX1229/MAX1231 family of low-power 12-bit serial ADCs. Each device bundles an analog multiplexer with true-differential track/hold, an internal voltage reference, clock, an internal temperature sensor and a 16-entry FIFO. The MAX1231 provides 16 single-ended or 8 true-differential inputs, software-configurable as unipolar or bipolar, converting at up to 300ksps.

An internal temperature sensor (±0.7°C accuracy) and a 16-entry FIFO with scan mode let the host capture multiple channels - and the die temperature - in one efficient burst, with optional internal averaging to improve effective resolution. The MAX1231 offers ±1 LSB INL and DNL with no missing codes over temperature, and carries an internal 2.5V reference or accepts an external differential reference.

The 10MHz SPI/QSPI/MICROWIRE-compatible 3-wire interface eases connection to microcontrollers and DSPs. Running on a single +3V supply at just 1mA (300ksps), with AutoShutdown between conversions, the MAX1231BEEG+T fits low-power data-acquisition, industrial control, patient-monitoring and instrumentation designs in a compact 24-pin QSOP.

Note: Refer to the official Maxim MAX1227/MAX1229/MAX1231 datasheet for full electrical parameters and curves. Subject to change without notice; verify all parameters before final design.

The MAX1231BEEG+T is supplied in the 24-pin QSOP package (Maxim package code E24, outline 21-0055), indicated by the EEG suffix. The narrow QSOP body packs 16 channels into a small footprint; the 8- and 12-channel siblings (MAX1227/MAX1229) use 16- and 20-pin QSOP, and a 28-pin TQFN-EP version is also offered.

The "+" suffix indicates lead-free, RoHS-compliant finish and the "T" suffix tape-and-reel packing. Standard 24-lead QSOP land patterns and reflow profiles apply; bypass VDD and REF+ (0.1µF to GND) close to the device, and keep analog inputs away from the SCLK line for best noise performance.

The MAX1231 uses a 24-pin QSOP pinout (top view, pin 1 marked):

• Pins 1-14 - AIN0 to AIN13: Analog input channels 0 to 13.
• Pin 15 - REF-/AIN14: External differential reference negative input, or analog input 14 (set by the setup register).
• Pin 16 - CNVST/AIN15: Active-low conversion-start input, or analog input 15 (set by the setup register).
• Pin 17 - REF+: Reference positive input; bypass 0.1µF to GND.
• Pin 18 - GND / Pin 19 - VDD: Ground and +3V supply (bypass VDD 0.1µF to GND).
• Pin 20 - SCLK / Pin 21 - CS / Pin 22 - DIN / Pin 23 - DOUT / Pin 24 - EOC: Serial clock, chip-select (active low), data in, data out, and end-of-conversion (active low).

The 3-wire serial port (SCLK/CS/DIN/DOUT, plus EOC and optional CNVST) connects to SPI, QSPI or MICROWIRE hosts. Confirm the exact pin assignment against the datasheet image below before layout.

The following parts are listed for reference. Verify channels, interface, reference and package before substituting.

Maxim Integrated, now part of Analog Devices (NASDAQ: ADI), is a leading supplier of analog and mixed-signal semiconductors, recognized for integrated data converters with on-chip references, temperature sensors and FIFOs. The MAX1227/MAX1229/MAX1231 serial ADC family is widely used for compact multichannel acquisition in industrial and medical systems.

Maxim/ADI provides complete datasheets, application notes and long-term supply, with authorized distribution and technical support across China for both prototype and volume programs.