GENERAL DESCRIPTION

The AD7982 is an 18-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD. The AD7982 contains a low power, high speed, 18-bit sampling ADC and a versatile serial interface port. On the CNV rising edge, the AD7982 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. The reference voltage, VREF, is applied externally and can be set independent of the supply voltage, VDD. Its power scales linearly with throughput.

FEATURES

High performance

True differential analog input range: ±VREF

0 V to VREF with VREF between 2.5 V to 5 V

Easy to drive with the ADA4941-1 or ADA4940-1

Throughput: 1 MSPS

Zero latency architecture

18-bit resolution with no missing codes

INL: ±1 LSB typical, ±2 LSB maximum

Dynamic range: 99 dB, VREF = 5 V

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

THD: ?119 dB at fIN = 1 kHz, VREF = 5 V

SINAD: 97 dB at fIN = 1 kHz, VREF = 5 V

Low power dissipation

Single-supply 2.5 V operation with 1.8 V, 2.5 V, 3 V, and

5 V logic interface

4 mW at 1 MSPS (VDD only)

7 mW at 1 MSPS (total)

70 μW at 10 kSPS

Proprietary serial interface

SPI-/QSPI?/ MICROWIRE?-/DSP-compatible1

Ability to daisy-chain multiple ADCs and busy indicator

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

Wide operating temperature range: ?40°C to +85°C

APPLICATIONS

Automated test equipment

Data acquisition systems

Medical instruments

Machine automation

AD7982屬于集成電路（IC） > 模數轉換器（ADC）。亞德諾半導體技術有限公司制造生產的AD7982模數轉換器（ADC）模數轉換器（ADC、A/D 或 A 轉 D）對模擬信號進行采樣，例如由麥克風采集的聲音或傳感器的輸出，然后將其轉換為數字信號。一般來說，數字輸出是二進制補碼二進制數，與輸入成比例。輸入類型可能是差分、偽差分或單端輸入。模數轉換器可按照位數、采樣率、輸入數、接口、轉換器數和架構（例如自適應增量、雙斜率、折疊、流水線、SAR、三角積分、兩步式）進行選擇。