AD7631

14位， 1 MSPS ，差分可编程输入的PulSAR ADC 14-Bit, 1 MSPS, Differential, Programmable Input PulSAR ADC

Product Details

The is an 18-bit, charge redistribution, successive approximation register SAR, architecture analog-to-digital converter ADC fabricated on Analog Devices, Inc.’s _i_CMOS high voltage process. The device is configured through hardware or via a dedicated write-only serial configuration port for input range and operating mode. The AD7631 contains a high speed 18-bit sampling ADC, an internal conversion clock, an internal reference and buffer, error correction circuits, and both serial and parallel system interface ports. A falling edge on CNVST samples the fully differential analog inputs on IN+ and IN−. The AD7631 features four different analog input ranges. Power is scaled linearly with throughput. Operation is specified from −40°C to +85°C.

**Applications**

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Process controls

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High speed data acquisition

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Digital signal processing

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Spectrum analysis ATE

### Features and Benefits

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Multiple pins/software-programmable input ranges

+5 V 10 V p-p, +10 V 20 V p-p,

±5 V 20 V p-p, ±10 V 40 V p-p

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Pins or serial SPI®-compatible input ranges/mode selection

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Throughput: 250 kSPS

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INL: ±1.5 LSB typical, ±2.5 LSB maximum ±9.5 ppm of FSR

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18-bit resolution with no missing codes

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Dynamic range: 102.5 dB

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SNR: 101 dB @ 2 kHz

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THD: −112 dB @ 2 kHz

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_i_CMOS® process technology

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5 V internal reference: typical drift 3 ppm/°C; TEMP output

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No pipeline delay SAR architecture

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Parallel 18-/16-/8-bit bus and serial 5 V/3.3 V interface