General Description
The MAX11040 is a 24-bit, 4-channel, simultaneous sampling, sigma-delta analog-to-digital converter (ADC). The device allows simultaneous sampling of as many as 32 channels using a built-in cascade feature to synchronize as many as eight devices. The serial interface of the MAX11040 allows reading data from all the cascaded devices using a single command. Four modulators simultaneously convert each fully differential analog input with a programmable data output rate ranging from 0.25ksps to 64ksps. The device achieves 106dB SNR at 16ksps and 117dB SNR at 1ksps. The MAX11040 operates from a single +3V supply. The differential analog input range is ±2.2V when using the internal reference, an external reference is optional. Each input is overvoltage protected up to ±6V without damage. The device uses an internal crystal oscillator or an external source for clock.

Features
♦ Four Fully Differential Simultaneously Sampled Channels
♦ Cascadable for Up to 32 Channels of Simultaneous Sampling
♦ 106dB SNR at 16ksps
♦ 117dB SNR at 1ksps
♦ 0.25% Error Over a 1000:1 Dynamic Range, Processed Over 16.7ms
♦ ±2.2V Full-Scale Input Range
♦ ±6V Overvoltage Protected Inputs
♦ Internal Crystal Oscillator
♦ 2.5V, 50ppm/°C Internal Reference or External Reference
♦ Programmable Output Data Rate
   0.25ksps to 64ksps Range
   0.065% Resolution
♦ Programmable Sampling Phase
   0 to 333µs Delay in 1.33µs Steps
♦ SPI-/QSPI-/MICROWIRE-/DSP-Compatible 4-Wire Serial Interface
♦ Cascadable Interface Allows Control of Up to
   Eight Devices with a Single CS Signal
♦ 3.0V to 3.6V Analog Supply Voltage
♦ 2.7V to VAVDD Digital Supply Voltage
♦ 38-Pin TSSOP Package

Applications
   Power Protection Relay Equipment
   Multiphase Power Systems
   Industrial Data-Acquisition Systems
   Medical Instrumentation