General Description

The MAX11321–MAX11328 are 12-/10-bit with external reference and 500kHz, full-linear-bandwidth, high-speed, low-power, serial-output successive approximation register (SAR) analog-to-digital converters (ADCs). The MAX11321–MAX11328 provide external access to the output of the integrated mux and ADC input, to simplify conditioning. The MAX11321–MAX11328 include both internal and external clock modes. These devices feature scan mode in both internal and external clock modes. The internal clock mode features internal averaging to increase SNR. The external clock mode features the SampleSetK technology, a user-programmable analog input channel sequencer. The SampleSet approach provides greater sequencing flexibility for multichannel applications while alleviating significant microcontroller or DSP (controlling unit) communication overhead.

Benefits and Features

♦ Scan Modes, Internal Averaging, and Internal Clock

♦ 16-Entry First-In/First-Out (FIFO)

♦ SampleSet: User-Defined Channel Sequence with Maximum Length of 256

♦ Input Pins

◇ Any Combination of Single-Ended, Differential and Pseudo-Differential Pairs Allowed

♦ Analog Multiplexer with True Differential Track/Hold

◇ 16-/8-/4-Channel Single-Ended

◇ 12-/8-/4-Channel Fully-Differential Pairs

◇ 15-/8-/4-Channel Pseudo-Differential Relative to a Common Input

♦ Externally Accessible Multiplex Output and ADC Input

♦ Two Software-Selectable Bipolar Input Ranges

◇ ±VREF+/2, ±VREF+

♦ Flexible Input Configuration Across All Channels

♦ High Accuracy

◇ ±1 LSB INL, ±1 LSB DNL, No Missing Codes

♦ 70dB SINAD Guaranteed at 100kHz Input Frequency

♦ 1.5V to 3.6V Digital I/O Supply Voltage

♦ 2.35V to 3.6V Supply Voltage

♦ Extended Battery Life for Portable Applications

◇ 5.4mW at 1Msps with 3V Supplies

◇ 2µA Full-Shutdown Current

♦ External Differential Reference (1V to VDD)

♦ 16MHz, 3-Wire SPI-/QSPI-/MICROWIRE-/DSP Compatible Serial Interface

♦ Wide -40NC to +125NC Operation

♦ Space-Saving, 32-Pin, 5mm x 5mm TQFN Packages

♦ 1Msps Conversion Rate, No Pipeline Delay

Applications

  High-Speed Data Acquisition Systems

  High-Speed Closed-Loop Systems

  Industrial Control Systems

  Medical Instrumentation

  Battery-Powered Instruments

  Portable Systems