GENERAL DESCRIPTION
The AD7687 is a 16-bit, charge redistribution, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD, between 2.3 V to 5.5 V. It contains a low power, high speed, 16-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial 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 the voltage difference between IN+ and IN− pins. The voltages on these pins usually swing in opposite phase between 0 V to REF. 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
   INL: ±0.4 LSB typ, ±1.5 LSB max (±23 ppm of FSR)
   Dynamic range: 96.5 dB
   S/(N + D): 95.5 dB @ 20 kHz
   THD: −118 dB @ 20 kHz
   True differential analog input range
      ±VREF
      0 V to VREF with VREF up to VDD on both inputs
   No pipeline delay
   Single-supply 2.3 V to 5.5 V operation with
      1.8 V/2.5 V/3 V/5 V logic interface
   Serial interface SPI®/QSPI™/MICROWIRE™/DSP-compatible
   Daisy-chain multiple ADCs and BUSY indicator
   Power dissipation
      1.35 mW @ 2.5 V/100 kSPS, 4 mW @ 5 V/100 kSPS, and
      1.4 μW @ 2.5 V/100 SPS
   Standby current: 1 nA
   10-lead MSOP (MSOP-8 size) and
      3 mm × 3 mm QFN (LFCSP) (SOT-23 size)
   Pin-for-pin compatible with AD7685, AD7686, and AD7688

APPLICATIONS
   Battery-powered equipment
   Data acquisitions
   Instrumentation
   Medical instruments
   Process controls