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Mixed Signal/Analog

Maxim - Simultaneous-Sampling 24-Bit ADC Is Cascadable to 32 Channels

25th June 2009

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Datasheet

Maxim has introduced the MAX11040 4-channel, 24-bit simultaneous-sampling ADC. Developed to enable unprecedented simplicity in system design, up to eight MAX11040 devices can be daisy-chained to provide a sampling capacity of up to 32 channels. The MAX11040 achieves this high capacity and scalability with a unique cascadable SPI(TM)/QSPI(TM)/MICROWIRE(TM) interface, which eliminates the complexity of using individual chip-select inputs to control each ADC. Because all eight MAX11040 devices can be accessed using only a single chip-select input, from the host processor's point of view, the control logic remains the same regardless if there are only 4 or as many as 32 channels.

The MAX11040 uniquely provides compensation for phase shifts caused by resistor dividers, transformers, or filters at the analog inputs through a programmable delay of 0 to 333microseconds. Together with a minimum of 90dB of SINAD and 91dB of SFDR, these features make the MAX11040 ideal for industrial power-grid-protection equipment, as well as medical EKG/EEG equipment and other applications that require accurate conversions of simultaneously sampled channels between 0.25ksps and 64ksps.

Additionally, overvoltage protection on the analog inputs protects the MAX11040 from voltages as large as ±6V when referenced to the device's analog ground, thus simplifying design and reducing cost.