AD7685 Datasheet PDF – 6-Bit, 250 kSPS, PulSAR ADC

Part Number: AD7685

Function: 16-Bit, 250 kSPS, PulSAR ADC

Package: 10-lead MSOP or a 10-lead QFN (LFCSP) Type

Manufacturer: Analog Devices

Image and Pinouts:

AD7685 datasheet



The AD7685 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 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. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic using the separate supply VIO. The AD7685 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C.


1. 16-bit resolution with no missing codes
2. Throughput: 250 kSPS
3. INL: ±0.6 LSB typical, ±2 LSB maximum (±0.003% of FSR)
– SINAD: 93.5dB @ 20 kHz
– THD: −110 dB @ 20 kHz
4. Pseudo differential analog input range : 0 V to VREFwith VREFup to VDD
5. No pipeline delay
6. Single-supply operation 2.3 V to 5.5 V with 1.8 V to 5 V logic interface
7. Serial interface SPI- / QSPI- / MICROWIRE- / DSP-compatible
8. Daisy-chain multiple ADCs, BUSY indicator
9. Power dissipation : 1.4μW @ 2.5 V/100 SPS , 1.35mW @ 2.5 V/100 kSPS, 4mW @ 5 V/100 kSPS Standby current: 1 nA
10. Pin-for-pin-compatible with 10-lead MSOP/QFN PulSAR ADCs


1. Battery-powered equipment
2. Medical instruments
3. Mobile communications
4. Personal digital assistants (PDAs)
5. Data acquisition
6. Instrumentation
7. Process controls


Other data sheets are available within the file:


AD7685 Datasheet PDF Download

AD7685 pdf