AD974ARS - 4-Channel 16-Bit 200 kSPS ADC | Analog Devices
部品番号: AD974ARS ✗ 生産終了AD974ARS 概要
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.
ドロップイン代替品: AD974ARS — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
AD974BRS-RL7
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD974BRSZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD974ARS 最大定格＆電気的特性
| Number of Analog Input Channels | 4 channels |
| Input Configuration | 4 single-ended analog inputs |
| ADC Resolution | 16 bit |
| サンプリングレート | 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 |
| インターフェースタイプ | Serial |
| Clock | On-chip clock |
| Power-Down Mode | Supported |
| パッケージ | 28-pin SSOP |
| 実装タイプ | Surface Mount |
AD974ARS 28-pin ssop ピン配置ガイド
AD974ARS (28-pin ssop パッケージ) のピン配置。 このアナログコンポーネントは、入力、出力、および電源ピンを備えています。オフセットナル、補償、イネーブルピンの設定については、メーカーのデータシートを参照してください。信号調整やアンプ回路に最適です。
詳細なピン配置データはありません: AD974ARS.
詳細は データシート をご参照ください。
主な用途
AD974ARS の用途: 6 件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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: AD974ARS — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | 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 |
主な差別化要因
- Complete four-channel acquisition system in one package （vs AD974BRSZ)
- Single +5 V operation with integrated clock （vs AD974BRS-RL7)
- Pin-compatible migration path within the AD974 family （vs AD974BRS-RL7)
設計ノート
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.
コンプライアンス情報
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.