Product Details
●The AD7691 is an 18-bit, charge redistribution, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD, between 2.3 V and 5 V. It contains a low power, high speed, 18-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. On the CNV rising edge, it samples the voltage difference between the IN+ and IN− pins. The voltages on these pins usually swing in opposite phase between 0 V and REF. The reference voltage, REF, is applied externally and can be set up to the supply voltage.
●The part’s power 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 and provides an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate VIO supply.
●The AD7691 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C.
●Applications
● Battery-powered equipment
● Data acquisitions
● Seismic data acquisition systems
● Instrumentation
● Medical instruments
●### Features and Benefits
● 18-bit resolution with no missing codes
● Throughput: 250 kSPS
● INL: ±0.75 LSB typical, ±1.5 LSB maximum (±6 ppm of FSR)
● Dynamic range: 102 dB typical at 250 kSPS
● Oversampled dynamic range: 125 dB at1 kSPS
● Noise-free code resolution: 20 bits at 1 kSPS
● Effective resolution: 22.7 bits at 1 kSPS
● See data sheet for additional features
●AD7691-EP supports defense and aerospace applications (AQEC standard)
● Download AD7691-EP data sheet (pdf)
● Military temperature range: -55°C to +105°C
● Controlled manufacturing baseline
● One assembly/test site
● One fabrication site
● Enhanced product change notification
● Qualification data available on request
● V62/14632-01XE DSCC Drawing Number
