ADS8681IPW集成电路（IC）的模数转换器（ADC）规格书PDF中文资料

ADS8681IPW属于集成电路（IC）的模数转换器（ADC）。由德州仪器制造生产的ADS8681IPW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。

1 Features

• 16-bit ADC with integrated analog front-end

• High speed:

– ADS8681: 1 MSPS

– ADS8685: 500 kSPS

– ADS8689: 100 kSPS

• Software programmable input ranges:

– Bipolar ranges: ±12.288 V, ±10.24 V, ±6.144 V,

±5.12 V, and ±2.56 V

– Unipolar ranges: 0 V–12.288 V, 0 V–10.24 V,

0 V–6.144 V, and 0 V–5.12 V

• 5-V analog supply: 1.65-V to 5-V I/O supply

• Constant resistive input impedance ≥ 1 MΩ

• Input overvoltage protection: Up to ±20 V

• On-chip, 4.096-V reference with low drift

• Excellent performance:

– DNL: ±0.4 LSB; INL: ±0.5 LSB

– SNR: 92 dB; THD: –107 dB

• ALARM → high, low threshold

• multiSPI™ interface with daisy-chain

• Extended industrial temperature range:

–40°C to +125°C

2 Applications

• Analog input modules

• Semiconductor test

• Servo drive control module

3 Description

The ADS8681, ADS8685, and ADS8689 belong to a

family of integrated data acquisition system based on

a successive approximation (SAR) analog-to-digital

converter (ADC). The devices feature a high-speed,

high-precision SAR ADC, integrated analog front-end

(AFE) input driver circuit, overvoltage protection circuit

up to ±20 V, and an on-chip 4.096-V reference with

extremely low temperature drift.

The devices operate on a single 5-V analog supply,

but support true bipolar input ranges of ±12.288 V,

±6.144 V, ±10.24 V, ±5.12 V, and ±2.56 V, as well

as unipolar input ranges of 0 V to 12.288 V, 0 V to

10.24 V, 0 V to 6.144 V, and 0 V to 5.12 V. The gain

and offset errors are accurately trimmed within the

specified values for each input range to ensure high

dc precision. The input range selection is done by

software programming of the device internal registers.

The devices offer a high resistive input impedance

(≥ 1 MΩ) irrespective of the selected input range.

The multiSPI digital interface is backward-compatible

to the traditional SPI protocol. Additionally,

configurable features simplify interface to a wide

range of host controllers.