AD7701SQ的中英文资料
GENERAL DESCRIPTION
The AD7701 is a 16-bit ADC that uses a sigma-delta conversion
technique. The analog input is continuously sampled by an analog
modulator whose mean output duty cycle is proportional to the
input signal. The modulator output is processed by an on-chip
digital filter with a six-pole Gaussian response, which updates
the output data register with 16-bit binary words at word rates up
to 4 kHz. The sampling rate, filter corner frequency, and output
word rate are set by a master clock input that may be supplied
externally, or by a crystal controlled on-chip clock oscillator.
The inherent linearity of the ADC is excellent and endpoint
accuracy is ensured by self-calibration of zero and full scale,
which may be initiated at any time. The self-calibration scheme
can also be extended to null system offset and gain errors in the
input channel.
The output data is accessed through a flexible serial port, which
has an asynchronous mode compatible with UARTs and two
synchronous modes suitable for interfacing to shift registers or
the serial ports of industry-standard microcontrollers.
CMOS construction ensures low power dissipation, and a powerdown
mode reduces the idle power consumption to only 10 μW.
PRODUCT HIGHLIGHTS
1. The AD7701 offers 16-bit resolution coupled with outstanding
accuracy.
2. No missing codes ensures true, usable, 16-bit dynamic range,
removing the need for programmable gain and level-setting
circuitry.
3. The effects of temperature drift are eliminated by on-chip
self-calibration, which removes zero and gain error. External
circuits can also be included in the calibration loop to remove
system offsets and gain errors.
4. A flexible synchronous/asynchronous interface allows the
AD7701 to interface directly to UARTs or to the serial ports
of industry-standard microcontrollers.
5. Low operating power consumption and an ultralow power
standby mode make the AD7701 ideal for loop-powered
remote sensing applications, or battery-powered portable
instruments.
一般描述
AD7701是使用∑-Δ转换的16位模数转换器。
技术。模拟输入通过模拟连续采样。
平均输出占空比与之成正比的调制器
输入信号。调制器输出由片上处理。
具有六极高斯响应的数字滤波器，其更新
输出数据寄存器与16位二进制字在字率上升
到4千赫。采样率、滤波器拐角频率和输出
字速率由可提供的主时钟输入设置。
外部或由晶体控制的片上时钟振荡器。
ADC的固有线性度是优秀的和端点。
通过零点和满刻度的自校准保证精度。
它可以在任何时候启动。自校准方案
也可以扩展到空系统偏移和增益误差中。
输入通道。
通过灵活的串行端口访问输出数据，
具有与UARTs和2兼容的异步模式。
适用于移位寄存器或接口的同步模式
工业标准微控制器的串行端口。
CMOS结构确保低功耗和掉电
模式将空闲功耗降低到仅为10瓦。
产品亮点
1。AD7701提供16位分辨率与优秀的耦合
0.0015%准确度。
2。没有丢失的代码确保真正的、可用的、16位的动态范围，
消除对可编程增益和电平设置的需要
电路。
三。芯片上消除了温度漂移的影响。
自校准，消除零和增益误差。外部的
电路也可以包含在校准回路中以去除。
系统偏移和增益误差。
4。灵活的同步/异步接口允许
AD7701直接与UART或串口连接
工业标准的微控制器。
5。低功耗和超低功耗
待机模式使AD7701理想的环路供电
遥感应用，或电池供电便携式
仪器。
特征
单片16位模数转换器
0.0015%线性误差
片上自校准电路
可编程Low Pass Filter
0.1赫兹到10赫兹的拐角频率
0伏+2.5 V或2.5 V模拟输入范围
4 kSPS输出数据速率
柔性串行接口
超低功率
应用
工业过程控制
称量秤
便携式仪器仪表
远程数据采集