AD7691SRMZ-EP-RL7

18Bit, 1.5 LSB INL, 250KSPS PulSAR® Differential ADC in MSOP/QFN

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**

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Battery-powered equipment

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Data acquisitions

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Seismic data acquisition systems

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Instrumentation

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Medical instruments

### Features and Benefits

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18-bit resolution with no missing codes

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Throughput: 250 kSPS

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INL: ±0.75 LSB typical, ±1.5 LSB maximum ±6 ppm of FSR

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Dynamic range: 102 dB typical at 250 kSPS

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Oversampled dynamic range: 125 dB at1 kSPS

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Noise-free code resolution: 20 bits at 1 kSPS

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Effective resolution: 22.7 bits at 1 kSPS

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See data sheet for additional features

AD7691-EP supports defense and aerospace applications AQEC standard

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Download AD7691-EP data sheet pdf

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Military temperature range: -55°C to +105°C 

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Controlled manufacturing baseline 

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One assembly/test site 

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One fabrication site 

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Enhanced product change notification 

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Qualification data available on request

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V62/14632-01XE DSCC Drawing Number