Simultaneous-Sampling 24-Bit ADC Is Cascadeable To 32 Channels

The MAX11040, a four-channel, 24-bit simultaneous-sampling ADC, enables up to eight 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/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 of SINAD and 91 dB of SFDR, these features make the MAX11040 suitable 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, 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. The MAX11040 is available in a lead-free, 38-pin TSSOP package. Prices start at $13.45 each in lots of 1000. MAXIM INTEGRATED PRODUCTS, Sunnyvale, CA. (800) 998-8800.