AD974ARS - 4-Channel 16-Bit 200 kSPS ADC | Analog Devices
料号： AD974ARS ✗ 停产AD974ARS 概述
An ADC is an analog-to-digital converter, a data acquisition component that converts continuous analog voltage signals into digital values for processing, measurement, or transmission. In the AD974, the four-channel multiplexer sits ahead of the 16-bit sampling ADC, allowing one converter core to service four single-ended analog inputs. This ADC belongs to the data converter and data acquisition IC hierarchy rather than the broad category of general-purpose analog or digital semiconductors.
The primary specifications are a 16-bit conversion resolution, 200 kSPS throughput, four single-ended input channels, and operation from one +5 V supply. The integrated reference is +2.5 V and may be selected as either an internal or external reference. Additional power-management features include a power-down mode, while the on-chip clock reduces the need for external timing circuitry. Maximum power dissipation is listed as 120 mW.
Internally, the AD974 uses a successive-approximation, switched-capacitor conversion architecture. The input multiplexer routes one of four single-ended channels to the ADC core, while the sampling system establishes the voltage to be converted. Its serial interface provides a compact connection to a controller, DSP, or embedded processor. The supplied range of 4.75 V to 5.25 V accommodates regulated +5 V system rails while providing defined operating limits.
Typical uses include industrial process monitoring, laboratory data logging, multichannel instrumentation, embedded measurement systems, and control equipment. It is especially relevant where four analog inputs must be digitized through a shared 16-bit converter rather than through four separate ADC packages. For lower-throughput acquisition, the multiplexer also reduces conversion contention between channels by sharing the ADC core.
A key design consideration is the input-range configuration. The circuit must present only signals within the selected 0 V to +4 V, 0 V to +5 V, or ±10 V range, and the interface and reference arrangement must follow the manufacturer datasheet. Designers should also budget decoupling around the single +5 V supply and account for the 120 mW maximum power dissipation when choosing PCB copper area and the surrounding thermal environment.
This product record combines manufacturer and distributor information, verified alternatives, package details, pricing, and application-focused engineering guidance. It is intended to make AD974ARS selection, sourcing, and design-in decisions faster while clearly identifying parameters that require confirmation against the manufacturer datasheet.
直接替换替代料： AD974ARS ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
AD974BRS-RL7
✅ 直接替换📋 参考替代料（不在目录中）
AD974BRSZ
✅ 直接替换📋 参考替代料（不在目录中）
AD974ARS 最大额定值与电气特性
| Number of Analog Input Channels | 4 channels |
| Input Configuration | 4 single-ended analog inputs |
| ADC Resolution | 16 bit |
| 采样率 | 200 kSPS |
| Conversion Architecture | Successive-approximation switched-capacitor ADC |
| Internal Reference Voltage | +2.5 V |
| Reference Selection | Internal or external 2.5 V reference |
| Nominal Supply Voltage | +5 V |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Analog Input Range 1 | 0 V to +4 V |
| Analog Input Range 2 | 0 V to +5 V |
| Analog Input Range 3 | ±10 V |
| Maximum Power Dissipation | 120 mW |
| 接口类型 | Serial |
| Clock | On-chip clock |
| Power-Down Mode | Supported |
| 封装 | 28-pin SSOP |
| 安装类型 | Surface Mount |
AD974ARS 28-pin ssop 引脚配置指南
AD974ARS（28-pin ssop 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： AD974ARS.
请参阅 数据手册 以查看完整引脚配置。
典型应用
AD974ARS 适用于 6 应用s: Industrial Process Monitoring, Laboratory Data Logging, Embedded Instrumentation, Multichannel Control Systems, Test and Measurement Equipment, Portable Measurement Devices.
Industrial Process Monitoring
The AD974ARS fits four-channel industrial process monitoring because it combines four single-ended inputs with a 16-bit, 200 kSPS sampling rate in one 28-pin SSOP package. The shared successive-approximation ADC can acquire temperature, pressure, level, or position signals without requiring four separate converter packages. A single +5 V supply and internal +2.5 V reference simplify system partitioning. Before production use, confirm the operating-temperature grade, calibration behavior, and long-term lifecycle availability; those details are not present in the verified excerpts.
推荐
Laboratory Data Logging
AD974ARS is suitable for laboratory data-logging equipment requiring repeatable multichannel conversion rather than maximum conversion speed. Its four single-ended analog inputs support several sensor or transducer channels, while the 16-bit resolution provides 65,536 digital codes per conversion. The 200 kSPS converter throughput supports shared acquisition across those channels, and the serial interface limits wiring requirements. The 120 mW maximum power dissipation and 28-pin SSOP footprint should be considered in compact bench instruments.
推荐
Embedded Instrumentation
The AD974ARS integrates the functions normally distributed across a multichannel analog front end and ADC: an input multiplexer, a 16-bit sampling converter, a +2.5 V reference, and an on-chip clock. This integration is useful in embedded instruments where board area and component count are constrained. It can support inputs configured for 0 V to +4 V, 0 V to +5 V, or ±10 V, depending on the selected analog range. Circuit implementation must include suitable input conditioning and a compliant +5 V supply arrangement.
推荐
Multichannel Control Systems
AD974ARS can serve as the acquisition section of a multichannel control system that monitors pressure, flow, position, or analog command signals. Four single-ended channels reduce the number of independent converters required, and the 200 kSPS throughput provides a shared conversion resource for the multiplexer. Its serial interface can connect to a digital controller, while power-down mode helps manage energy use during inactive periods. Designers must sequence acquisition and ensure that source impedance and input-range limits satisfy the manufacturer’s analog input recommendations.
推荐
Test and Measurement Equipment
The AD974ARS is appropriate for test and measurement equipment that requires four synchronized measurement inputs and high-resolution conversion. Its 16-bit resolution supports fine measurement granularity, while 200 kSPS throughput allows each selected channel to be sampled through the common ADC core. The internal +2.5 V reference, optional external reference path, on-chip clock, and single +5 V operation simplify the analog subsystem. For precision instruments, verify reference accuracy, input-noise performance, and calibration procedures directly in the manufacturer datasheet.
推荐
Portable Measurement Devices
AD974ARS can support portable measurement devices where four analog channels must share a compact converter and the complete acquisition system must operate from one +5 V rail. The 28-pin SSOP package supports surface-mount assembly, while the 120 mW maximum power dissipation is important when designing a compact enclosure. Power-down mode can reduce consumption during inactive intervals. Battery-derived systems still require a regulated +5 V rail or suitable supply arrangement, and the product’s obsolete lifecycle status requires careful sourcing planning.
推荐
推荐产品汇总
工程参考数据： AD974ARS ——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 | AD974BRS-RL7 | AD974BRSZ |
|---|---|---|---|
| Package | SSOP-28 | SSOP-28 | SSOP-28 |
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bit | 16 bit | 16 bit |
| Sampling Rate | 200 kSPS | 200 kSPS | 200 kSPS |
关键差异点
- Complete four-channel acquisition system in one package （对比 AD974BRSZ)
- Single +5 V operation with integrated clock （对比 AD974BRS-RL7)
- Pin-compatible migration path within the AD974 family （对比 AD974BRS-RL7)
设计说明
The AD974ARS requires a single +5 V supply within the verified 4.75 V to 5.25 V operating range. Place the recommended input and reference bypass capacitors close to their associated pins, keep the high-current return path short, and use a low-impedance source for the supply. Account for the listed 120 mW maximum power dissipation when estimating heat in compact instruments, and use power-down mode when continuous conversion is unnecessary.
Do not apply input voltages outside the configured 0 V to +4 V, 0 V to +5 V, or ±10 V range. Four single-ended channels do not automatically imply that every source can drive any range without front-end conditioning. Verify source impedance, input protection, grounding, and the selected range against the manufacturer datasheet. Also confirm the exact ADC data format and serial timing before connecting a controller or DSP.
Keep the analog input traces short and isolated from digital serial-interface and clock-return paths. Route the muxed inputs away from switching regulators, high-current relays, and other noisy sources. Use a continuous ground plane where practical, maintain short supply and bypass connections, and place input conditioning components near the relevant AD974ARS pins rather than near the remote sensor. Analog and digital return currents should not share unnecessarily long paths.
Because a verified data source labels AD974ARS obsolete and stock is not guaranteed, engineers should approve a second source before committing to production volumes. AD974BRS-RL7 and AD974BRSZ are documented substitutes in the supplied cross-reference data, but their ordering suffixes, temperature grades, qualification status, and current inventory must still be checked. Avoid assuming that a distributor listing guarantees long-term availability or authorized provenance.
合规信息
The verified excerpts do not provide substantiated RoHS, REACH, halogen-free, lead-free, or conflict-minerals declarations for AD974ARS. AEC-Q100 is not applicable because this is a data acquisition IC rather than an automotive-qualified device.