GENERAL DESCRIPTION

The AD7694 is a 16-bit, charge redistribution, successive approximation, PulSAR analog-to-digital converter (ADC) that operates from a single power supply, VDD, between 2.7 V to 5.25 V. It contains a low power, high speed, 16-bit sampling ADC with no missing codes (B grade), an internal conversion clock, and a serial, SPI-compatible interface port. The part also contains a low noise, wide bandwidth, short aperture delay track-and-hold circuit. On the CNV rising edge, it samples an analog input, IN+, between 0 V to REF with respect to a ground sense, IN−. The reference voltage, REF, is applied externally and can be set up to the supply voltage.

FEATURES

16-bit resolution with no missing codes

Throughput: 250 kSPS at 5 V

INL: ±4 LSB max

S/(N + D): 92 dB at 20 kHz

THD: –106 dB at 20 kHz

Pseudo-differential analog input range:

0 V to VREF with VREF up to VDD

No pipeline delay

Single-supply operation: 2.7 V or 5 V

Proprietary serial interface

SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible1

Supply Current: 540 μA at 2.7 V/100 kSPS,

800 μA at 5 V/100 kSPS

Standby current: 1 nA

8-lead MSOP package

Improved second source to LTC1864 and LTC1864L

APPLICATIONS

Battery-powered equipment

Data acquisition

Instrumentation

Medical instruments

Process control

AD7684属于集成电路（IC） > 模数转换器（ADC）。亚德诺半导体技术有限公司制造生产的AD7684模数转换器（ADC）模数转换器（ADC、A/D 或 A 转 D）对模拟信号进行采样，例如由麦克风采集的声音或传感器的输出，然后将其转换为数字信号。一般来说，数字输出是二进制补码二进制数，与输入成比例。输入类型可能是差分、伪差分或单端输入。模数转换器可按照位数、采样率、输入数、接口、转换器数和架构（例如自适应增量、双斜率、折叠、流水线、SAR、三角积分、两步式）进行选择。