AD7940屬于集成電路（IC）的模數(shù)轉(zhuǎn)換器（ADC）。由亞德諾半導(dǎo)體技術(shù)有限公司制造生產(chǎn)的AD7940模數(shù)轉(zhuǎn)換器（ADC）模數(shù)轉(zhuǎn)換器（ADC、A/D 或 A 轉(zhuǎn) D）對(duì)模擬信號(hào)進(jìn)行采樣，例如由麥克風(fēng)采集的聲音或傳感器的輸出，然后將其轉(zhuǎn)換為數(shù)字信號(hào)。一般來說，數(shù)字輸出是二進(jìn)制補(bǔ)碼二進(jìn)制數(shù)，與輸入成比例。輸入類型可能是差分、偽差分或單端輸入。模數(shù)轉(zhuǎn)換器可按照位數(shù)、采樣率、輸入數(shù)、接口、轉(zhuǎn)換器數(shù)和架構(gòu)（例如自適應(yīng)增量、雙斜率、折疊、流水線、SAR、三角積分、兩步式）進(jìn)行選擇。

GENERAL DESCRIPTION

The AD7986 is an 18-bit, 2 MSPS successive approximation, analog-to-digital converter (ADC). It contains a low power, high speed, 18-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and a versatile serial interface port. On the rising edge of CNV, the AD7986 samples the voltage difference between the IN+ and IN? pins. The voltages on these pins usually swing in opposite phases between 0 V and VREF. It features a very high sampling rate turbo mode (TURBO = high) and a reduced power normal mode (TURBO = low) for low power applications where the power is scaled with the throughput.

FEATURES

18-bit resolution with no missing codes

Throughput: 2 MSPS (TURBO = high), 1.5 MSPS (TURBO = low)

Low power dissipation

15 mW at 2 MSPS, with external reference

26 mW at 2 MSPS with internal reference

INL: ±1 LSB typical, ±2.5 LSB maximum

SNR

95.5 dB, with on-chip reference

97.0 dB, with external reference

4.096 V internal reference: typical drift of 10 ppm/°C

True differential analog input voltage range: ±VREF

0 V to VREFwith VREFup to 5.0 V

Allows use of any input range

No pipeline delay

Logic interface: 1.8 V/2.5 V/2.7 V

Serial interface: SPI/QSPI?/MICROWIRE?/DSP compatible

Ability to daisy-chain multiple ADCs with busy indicator

20-lead 4 mm × 4 mm LFCSP (QFN)

APPLICATIONS

Battery-powered equipment

Data acquisition systems

Medical instruments

Seismic data acquisition systems