GENERAL DESCRIPTION The AD7694 is a 16-bit, charge redistribution, successive approximation, PulSAR analog-to-digital converter (ADC) that operates from a single power supply, VDD, between 2.7 V to 5.25 V. It contains a low power, high speed, 16-bit sampling ADC with no missing codes (B grade), an internal conversion clock, and a serial, SPI-compatible interface port. The part also contains a low noise, wide bandwidth, short aperture delay track-and-hold circuit. On the CNV rising edge, it samples an analog input, IN+, between 0 V to REF with respect to a ground sense, IN−. The reference voltage, REF, is applied externally and can be set up to the supply voltage. FEATURES 16-bit resolution with no missing codes Throughput: 250 kSPS at 5 V INL: ±4 LSB max S/(N + D): 92 dB at 20 kHz THD: –106 dB at 20 kHz Pseudo-differential analog input range: 0 V to VREF with VREF up to VDD No pipeline delay Single-supply operation: 2.7 V or 5 V Proprietary serial interface SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible1 Supply Current: 540 μA at 2.7 V/100 kSPS, 800 μA at 5 V/100 kSPS Standby current: 1 nA 8-lead MSOP package Improved second source to LTC1864 and LTC1864L APPLICATIONS Battery-powered equipment Data acquisition Instrumentation Medical instruments Process control
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