AD7989-1BCPZ-RL7

模数转换器 - ADC uSAR, 18bit LP 100ksps

Product Details

The AD7989-1/AD7989-5 are 18-bit, successive approximation, analog-to-digital converters ADCs that operate from a single power supply, VDD. The AD7989-1/AD7989-5 contain a low power, high speed, 18-bit sampling ADC and a versatile serial interface port. On the CNV rising edge, the AD7989-1/AD7989-5 sample the voltage difference between the IN+ and IN− pins. The voltages on these pins typically swing in opposite phases between 0 V and VREF. The reference voltage, VREF, is applied externally and can be set independent of the supply voltage, VDD. Its power scales linearly with throughput.

The AD7989-1/AD7989-5 are serial peripheral interface SPI- compatible, which features the ability, using the SDI/CS input, to daisy-chain several ADCs on a single 3-wire bus. The AD7989-1/AD7989-5 are compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic, using the separate VIO supply.

The AD7989-1/AD7989-5 are available in a 10-lead MSOP or a 10-lead LFCSP with operation specified from −40°C to +85°C.

**Applications**

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Battery-powered equipment

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Data acquisition systems

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Medical instruments

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Seismic data acquisition systems

### Features and Benefits

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Low power dissipation

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400 μW at 500 kSPS typical VDD only

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700 μW at 500 kSPS typical total

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18-bit resolution with no missing codes

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Throughput: 100 kSPS

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INL: ±1 LSB typical, 2 LSB maximum

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SNR: 98 dB at 1 kHz, VREF = 5 V typical

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SINAD: 97 dB at 1 kHz typical

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THD: −120 dB at 10 kHz typical

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Dynamic range: 99 dB at VREF = 5 V typical

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True differential analog input voltage range: ±VREF

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0 V to VREF with VREF between 2.4 V and 5.1 V

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No pipeline delay

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

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Proprietary serial interface SPI-/QSPI™-/MICROWIRE™-/DSP-compatible

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Ability to daisy-chain multiple ADCs

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10-lead MSOP and 3 mm × 3 mm 10-Lead LFCSP