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The conversion process and data acquisiTIon are controlled using the CONVST signals and an internal oscillator. Three CONVST pins (CONVST A, CONVST B, and CONVST C) allow independent, simultaneous sampling of the three ADC pairs. The AD7656-1/AD7657-1/AD7658-1 have a high speed parallel and serial interface, allowing the devices to interface with microprocessors or DSPs. When the serial interface is selected, each part has a daisy-chain feature that allows mulTIple ADCs to connect to a single serial interface. The AD7656-1/AD7657-1/ AD7658-1 can accommodate true bipolar input signals in the ±4 × VREF and ±2 × VREF ranges. Each AD7656-1/AD7657-1/ AD7658-1 also contains an on-chip 2.5 V reference.PRODUCT HIGHLIGHTS1.Six 16-/14-/12-bit, 250 kSPS ADCs on board.2.Six true bipolar, high impedance analog inputs.3.High speed parallel and serial interfaces.4.Reduced decoupling requirements and reduced bill of materials cost compared with the AD7656/AD7657/ AD7658 devices.
