AD974BRZ - 4-Channel 16-Bit 200kSPS ADC | Analog Devices
料号： AD974BRZ ✓ 量产中AD974BRZ 概述
An ADC is an analog-to-digital converter, a semiconductor that samples continuous voltage signals and converts them into digital codes for processing, measurement, or transmission. In the product hierarchy, the AD974BRZ is a data acquisition system that integrates an ADC, analog multiplexer, voltage reference, and serial interface. This integration reduces the number of separate components required in instrumentation, industrial control, test equipment, and embedded measurement systems.
The AD974BRZ combines 16-bit resolution with a throughput of 200 kSPS across four single-ended input channels. Its internal 2.5 V reference provides the conversion reference, and the serial interface transfers converted data to a host processor. Factory calibration supports repeatable performance without requiring the user to perform the complete converter calibration procedure. The device also supports analog input ranges suitable for bipolar instrumentation as well as unipolar sensor signals.
The internal architecture uses a four-channel analog multiplexer followed by a high-speed successive-approximation, switched-capacitor sampling ADC. Multiplexing four inputs through one converter provides a practical balance between channel count, conversion throughput, power consumption, and package size. This architecture is appropriate when several sensors share a common sampling rate and data-conversion clock rather than requiring simultaneous independent conversion on every channel.
Typical uses include multichannel process monitoring, laboratory data logging, factory automation, sensor-interface modules, and embedded measurement systems. The 200 kSPS rate is suitable for many industrial and instrumentation signals, while the 16-bit format provides 65,536 digital codes across the selected input range. For applications requiring simultaneous sampling, substantially faster conversion, or more input channels, a different ADC architecture should be evaluated.
A critical design consideration is the relationship between input amplitude, selected range, source impedance, and acquisition time. The 120 mW maximum power dissipation and single +5 V supply simplify power planning, but analog input conditioning and grounding remain essential for accurate conversion. Protect unused channels and control signals according to the manufacturer datasheet, and verify the complete pinout and signal names before PCB layout.
This page consolidates verified manufacturer and distributor information, procurement guidance, application analysis, and the limits of available drop-in replacements. It also distinguishes published AD974 family options from genuine pin-compatible substitutes, helping engineers avoid treating different package variants as drop-in components.
直接替换替代料： AD974BRZ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： AD974BRZ （相同外形与封装尺寸） ——差异在于 Package, Supply Voltage.
该产品暂无直接替换替代料。
请求替代料AD974BRZ 最大额定值与电气特性
| ADC Type | Successive-approximation switched-capacitor ADC |
| 分辨率 | 16 bit |
| 采样率 | 200 kSPS |
| Analog Input Channels | 4 single-ended channels |
| Input Multiplexer | Integrated 4-channel analog multiplexer |
| 电源电压 | +5 V |
| Internal Reference | +2.5 V |
| Unipolar Input Range 1 | 0 V to +4 V |
| Unipolar Input Range 2 | 0 V to +5 V |
| Bipolar Input Range | ±10 V |
| 接口 | High-speed serial interface |
| Maximum Power Dissipation | 120 mW |
| Power-Down Mode | Supported |
| Factory Calibration | Factory calibrated to minimize linearity and offset errors |
| 封装 | 28-pin SOIC, 0.295 inch / 7.50 mm width |
| 安装类型 | Surface mount |
| Lead-Free Status | Lead free |
| RoHS 状态 | RoHS compliant |
AD974BRZ 28-pin soic, 0.295 inch / 7.50 mm width 引脚配置指南
AD974BRZ（28-pin soic, 0.295 inch / 7.50 mm width 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： AD974BRZ.
请参阅 数据手册 以查看完整引脚配置。
典型应用
AD974BRZ 适用于 6 应用s: Industrial Process Monitoring, Laboratory Data Logging, Factory Automation Sensor Interface, Embedded Measurement Systems, Test and Measurement Equipment, Sensor Interface Modules.
Industrial Process Monitoring
The AD974BRZ fits multichannel process monitoring where pressure, temperature, level, or position sensors produce analog voltages. Its four-channel multiplexer permits one 16-bit, 200 kSPS converter to sample up to four single-ended inputs sequentially, reducing converter count and PCB complexity. The selectable 0 V to +4 V, 0 V to +5 V, and ±10 V ranges provide useful conditioning flexibility, while the internal +2.5 V reference and factory calibration support repeatable readings. Engineers should add input protection, buffering where required, and verify the operating temperature range for the installation environment.
推荐
Laboratory Data Logging
The AD974BRZ is appropriate for laboratory instruments that acquire several low-bandwidth analog measurements and transfer the results through a serial interface. Four multiplexed single-ended inputs and 16-bit resolution are useful when the instrument must preserve measurement granularity without using four separate converters. Its 200 kSPS throughput is more than adequate for many temperature, pressure, potentiometer, and laboratory sensor channels. A practical design should protect the inputs, maintain a stable +5 V supply, and follow the manufacturer datasheet for acquisition timing and serial-interface implementation.
推荐
Factory Automation Sensor Interface
The AD974BRZ can serve as the analog measurement core of a factory automation module collecting several transducer signals. The four-channel 200 kSPS ADC supports rapid sequential sampling, while the integrated multiplexer, +2.5 V reference, and factory calibration reduce the number of discrete support components. The single +5 V operating supply simplifies common industrial board architecture. Because the verified material does not specify an industrial temperature rating or isolation capability, those requirements must be checked separately before deployment in machinery or safety-related installations.
推荐
Embedded Measurement Systems
The AD974BRZ is suitable for embedded systems that monitor several slowly changing analog quantities and require more resolution than an 8-bit or 12-bit converter. Its 16-bit conversion format provides 65,536 possible codes per selected range, and the four-channel multiplexer supports compact multi-sensor designs. The 120 mW maximum power specification helps constrain thermal requirements in compact equipment. Firmware must implement the appropriate serial protocol and conversion-control sequence, while the analog front end must prevent out-of-range signals from reaching the device.
推荐
Test and Measurement Equipment
The AD974BRZ can support compact test and measurement products that digitize several analog inputs in a controlled instrument. The 200 kSPS rate accommodates many general-purpose voltage measurements, and factory calibration helps reduce initial offset and linearity error. Its integrated reference and multiplexer simplify the signal chain compared with a discrete converter implementation. For precision metrology, engineers should verify input accuracy, noise, acquisition settling, reference behavior, and calibration limitations directly from the manufacturer datasheet rather than inferring performance solely from the nominal 16-bit resolution.
推荐
Sensor Interface Modules
The AD974BRZ fits sensor-interface modules that combine several analog transducers with digital processing. Its four single-ended channels can monitor resistive bridges, potentiometers, position sensors, or conditioned transducer outputs, provided each signal remains within the selected range. The internal +2.5 V reference and factory calibration make the device useful for repeatable module-level acquisition. Designers should account for sensor excitation, common-mode voltage, source impedance, and input bandwidth because those parameters determine whether the multiplexed converter achieves the required system accuracy.
推荐
推荐产品汇总
工程参考数据： AD974BRZ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 |
|---|---|
| Package | 28-pin SOIC, 0.295 inch / 7.50 mm width |
| Brand | Analog Devices |
| Resolution | 16 bit |
| Sampling Rate | 200 kSPS |
| Analog Input Channels | 4 single-ended channels |
| Supply Voltage | +5 V |
| Internal Reference | +2.5 V |
| Maximum Power Dissipation | 120 mW |
| Input Ranges | 0 V to +4 V, 0 V to +5 V, or ±10 V |
| Power-Down Mode | Supported |
关键差异点
- Integrated four-channel acquisition front end （对比 Discrete 16-bit ADC architecture)
- Wide selection of supported analog input ranges （对比 Single-range ADC designs)
- Compact integrated converter with controlled dissipation （对比 Higher-power multichannel converter systems)
设计说明
Route the +5 V supply and ground connections with low-impedance paths, place local decoupling at the device power pins, and keep analog input traces away from high-current or high-speed digital nets. The 28-pin SOIC footprint requires strict lead-pitch and courtyard verification before layout release because the supplied package library has no dedicated 28-pin SOIC symbol. Use the Analog Devices manufacturer land pattern as the controlling PCB source.
Treat the four analog inputs as multiplexed rather than simultaneously sampled. Establish the required settling time for each source impedance, use the manufacturer's recommended acquisition timing, and keep source impedances balanced where channel-to-channel timing differences matter. Add external buffers when sensor outputs cannot charge the sampling network reliably within the available acquisition interval.
Do not substitute AD974ARZ or AD974BRSZ directly for an existing AD974BRZ board: the verified package data identifies the former devices as SSOP-28 and the target as SOIC-28. They are family-level alternatives, not pin-compatible drop-ins. Also confirm the selected input range against signal amplitude and polarity before fixing the analog front end and firmware conversion scaling.
Budget the device from its published 120 mW maximum power dissipation and verify that the +5 V supply remains within the required operating limits under dynamic serial traffic. Power-down can reduce consumption when conversion is idle, but the control sequence must follow the datasheet. Use local supply bypassing and test the power rail for disturbances generated by adjacent switching circuitry.
合规信息
RoHS-compliant and lead-free status are stated in the verified component listing. No verified REACH, halogen-free, conflict-minerals, or automotive qualification statement was supplied.
