AD7690BRMZ

18位， 1.5 LSB INL ， 400 kSPS时PulSAR®差分ADC ，采用MSOP / QFN 18-Bit, 1.5 LSB INL, 400 kSPS PulSAR® Differential ADC in MSOP/QFN

Product Details

The AD7690 is an 18-bit, successive approximation, analog-to-digital converter ADC that operates from a single power supply, VDD. 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 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 power of the AD7690 scales linearly with the 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 AD7690 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 acquisition

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Seismic data acquisition systems

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DVMs

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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: 400 kSPS

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INL: ±0.75 LSB typ, ±1.5 LSB max ±6 ppm of FSR

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Dynamic range: 102 dB @ 400 kSPS

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Oversampled dynamic range: 125 dB @ 1 kSPS

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Noise-free code resolution: 20 bits @ 1 kSPS

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Effective resolution: 22.7 bits @ 1 kSPS

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SINAD: 101.5 dB @ 1 kHz

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THD: −125 dB @ 1 kHz

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True differential analog input range: ±VREF 0 V to VREF with VREF up to VDD on both inputs

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No pipeline delay

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Single-supply 5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface