Maxim’s new MAX11040 is a 4-channel, 24-bit simultaneous-sampling ADC. Developed to enable simplicity in system design, up to eight devices can be daisy chained to provide a sampling capacity of up to 32 channels. The ADC achieves this high capacity and scalability with a cascadable SPI/QSPI/MICROWIRE 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 four or as many as 32 channels.
The MAX11040 provides compensation for phase shifts caused by resistor dividers, transformers or filters at the analog inputs through a programmable delay of 0 to 333 μs. Together with a minimum of 90 dB SINAD and 91 dB SFDR, these features make the device well suited 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 0,25 KSps and 64 KSps. Additionally, over-voltage protection on the analog inputs protects the MAX11040 from voltages as high as ±6 V when referenced to the device’s analog ground.
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