AD7686 Datasheet

• 16-bit resolution with no missing codes
• Throughput: 500 kSPS
• INL: ±0.6 LSB typical, ±2 LSB maximum (±0.003% of FSR)
• SINAD: 92.5 dB @ 20 kHz
• THD: −110 dB @ 20 kHz
• Pseudo differential analog input range 0 V to V_REF with V_REF up to VDD
• No pipeline delay
• Single-supply 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 
  3.75 μW @ 5 V/100 SPS 
  3.75 mW @ 5 V/100 kSPS
• Standby current: 1 nA

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

The AD7686 is a 16-bit, charge redistribution, successive approximation, analog-to-digital converter (ADC) that operates from a single 5 V power supply, VDD. 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, the AD7686 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.

Power dissipation scales linearly with throughput.

The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single, 3-wire bus or provides an optional busy indicator. This device is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate supply VIO.

The AD7686 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C.