General Description

The MAX11135–MAX11143 are 12-/10-/8-bit with external reference and industry-leading 1.5MHz, full linear bandwidth, high speed, low-power, serial output successive-approximation register (SAR) analog-to-digital converters (ADCs). The MAX11135–MAX11143 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

◆ Analog Multiplexer with True Differential Track/Hold

??? ◇ 16-/8-/4-Channel Single-Ended

??? ◇ 8-/4-/2-Channel Fully-Differential Pairs

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

◆ Two Software-Selectable Bipolar Input Ranges

??? ◇ QVREF+/2, QVREF+

◆ Flexible Input Configuration Across All Channels

◆ High Accuracy

??? ◇ Q1 LSB INL, Q1 LSB DNL, No Missing Codes Over Temperature Range

◆ 70dB SINAD Guaranteed at 250kHz Input Frequency

◆ 1.5V to 3.6V Wide Range I/O Supply

??? ◇ Allows the Serial Interface to Connect Directly to 1.8V, 2.5V, or 3.3V Digital Systems

◆ 2.35V to 3.6V Supply Voltage

◆ Longer Battery Life for Portable Applications

??? ◇ Low Power

??? ◇ 4.2mW at 500ksps with 3V Supplies

??? ◇ 2μA Full-Shutdown Current

◆ External Differential Reference (1V to VDD)

◆ 8MHz, 3-Wire SPI-/QSPI-/MICROWIRE-/DSPCompatible Serial Interface

◆ Wide -40NC to +125NC Operation

◆ Space-Saving, 28-Pin, 5mm x 5mm TQFN Packages

◆ 500ksps Conversion Rate, No Pipeline Delay

◆ 12-/10-/8-Bit Resolution

Applications

??? High-Speed Data Acquisition Systems

??? High-Speed Closed-Loop Systems

??? Industrial Control Systems

??? Medical Instrumentation

??? Battery-Powered Instruments

??? Portable Systems