AD7656BSTZ
16-bit, 6-channel analog-to-digital converters with parallel/serial interfaces
Manufacturer： ['rochester', 'analog-devices']
series introduction
# AD7656BSTZ Product Series Introduction
## 1. Overview
The AD7656BSTZ belongs to a high - performance, 16 - bit, 6 - channel, simultaneous sampling analog - to - digital converter (ADC) product series from Analog Devices. This series is designed to meet the demanding requirements of various industrial, instrumentation, and power system applications where accurate and simultaneous data acquisition of multiple analog signals is crucial.
## 2. Key Features
### 2.1 High Resolution
With a 16 - bit resolution, the AD7656BSTZ can provide a high level of precision in converting analog signals to digital values. This high resolution allows for the detection of small changes in the input analog signals, making it suitable for applications that require fine - grained measurement, such as sensor data acquisition in industrial automation and high - precision test equipment.
### 2.2 Simultaneous Sampling
One of the most significant features of this product series is the ability to sample up to six analog channels simultaneously. In applications where multiple related analog signals need to be measured at the exact same time, such as in three - phase power systems or multi - axis motion control, simultaneous sampling ensures that the phase relationships between the signals are accurately captured. This eliminates the errors that could occur if the signals were sampled at different times.
### 2.3 Wide Input Voltage Range
The AD7656BSTZ supports a wide input voltage range, which can be configured to different full - scale ranges. This flexibility allows it to interface with a variety of analog sensors and signal sources that may have different output voltage levels. For example, it can handle input signals from ±5V to ±10V, providing compatibility with a broad range of industrial sensors.
### 2.4 Low Power Consumption
In today's energy - conscious world, the low power consumption of the AD7656BSTZ is a valuable feature. It is designed to operate with relatively low power, which is beneficial for battery - powered applications or systems where power efficiency is a priority. This not only helps to reduce the overall power budget of the system but also contributes to longer battery life in portable devices.
### 2.5 High - Speed Conversion
The ADC in the AD7656BSTZ offers high - speed conversion capabilities. It can achieve a sampling rate of up to 250 kSPS (kilo - samples per second), enabling it to capture fast - changing analog signals accurately. This makes it suitable for applications such as high - speed data acquisition in communication systems and real - time monitoring of dynamic processes.
## 3. Functional Block Diagram and Working Principle
### 3.1 Block Diagram
The AD7656BSTZ consists of several key functional blocks, including six input channels, a sample - and - hold (S/H) circuit for each channel, a multiplexer, an ADC core, and a digital interface. The input channels are used to receive the analog signals from external sources. The S/H circuits sample and hold the analog signals at the same time, ensuring that the signals are frozen for conversion. The multiplexer selects the held signals one by one and sends them to the ADC core for conversion. The ADC core then converts the analog signals into 16 - bit digital values, which are output through the digital interface.
### 3.2 Working Principle
When a conversion start signal is received, the S/H circuits simultaneously sample the analog signals on all six channels. After the sampling is complete, the multiplexer sequentially routes the held analog signals to the ADC core. The ADC core uses a successive - approximation register (SAR) algorithm to convert the analog signals into digital values. Once the conversion is finished, the digital data is available at the output of the device and can be read by a micro
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