AD974AR - 4-Channel 16-Bit 200kSPS ADC | Analog Devices
MPN： AD974AR ✗ 停產AD974AR 概覽
A data acquisition system combines analog signal conditioning, multiplexing, sampling, quantization, and digital conversion into one integrated device. The AD974AR belongs to the ADC family within data-converter and signal-processing semiconductors. Its four-channel multiplexer reduces the need for separate analog switches when several sensors or measurement nodes must be digitized with one converter.
The main features are 16-bit resolution, 200 kSPS conversion throughput, four analog input channels, a 2.5 V internal reference, and a single 5 V supply. A power-down mode reduces consumption when acquisition is not required. The serial interface allows converted samples to be transferred efficiently to a digital controller, while the successive-approximation switched-capacitor architecture supports a practical balance among speed, resolution, power, and implementation complexity.
The AD974AR can accommodate 0 V to +4 V, 0 V to +5 V, or ±10 V analog input ranges. These ranges make the converter applicable to unipolar industrial measurements, positive voltage sensing, and bipolar instrumentation. The exact input bandwidth, acquisition time, conversion timing, output logic levels, reference accuracy, and operating-temperature limits are not supplied in the verified excerpts and must be confirmed in the manufacturer datasheet before design release.
Typical uses include industrial process monitoring, multichannel sensor acquisition, laboratory instrumentation, control systems, and embedded measurement platforms. In each case, the four-channel multiplexer is valuable when multiple signals must share one ADC. Designers should account for source impedance, sampling-charge requirements, serial-interface timing, analog grounding, and the selected input range rather than treating the converter as a direct voltage-measurement block.
For reliable operation, place input and reference components close to their associated pins, provide a clean 5 V supply, and route high-speed serial signals away from sensitive analog inputs. Confirm pin functions, package details, acquisition timing, and electrical limits against the official AD974 datasheet. This page combines the verified product description, distributor availability information, package identity, and engineering guidance for legacy or redesign scenarios.
直接替換替代品，適用於 AD974AR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： AD974AR （相同外形與佔位） — 差異在於 Package, Mounting Type, Supply Voltage, Power-Down Mode, Number of Analog Input Channels.
AD974BR
✅ 直接替換聯絡詢價
查看資料表 →AD974AR 最大額定值與電氣特性
| 解析度 | 16 bit |
| 取樣率 | 200 kSPS |
| Number of Input Channels | 4 channels |
| Converter Architecture | Successive-approximation switched-capacitor ADC |
| 供應電壓 | 5 V single supply |
| Internal Reference Voltage | +2.5 V |
| Input Range 1 | 0 V to +4 V |
| Input Range 2 | 0 V to +5 V |
| Input Range 3 | ±10 V |
| 介面類型 | High-speed serial interface |
| Integrated Multiplexer | Four-channel input multiplexer |
| Power-Down Mode | Supported |
| 封裝 | 28-pin SOIC |
| 安裝類型 | Surface Mount |
AD974AR 28-pin soic 腳位配置指南
AD974AR（28-pin soic 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： AD974AR.
請參閱 資料表 以查看完整腳位配置。
典型應用
AD974AR 適用於 6 應用s: Industrial Process Monitoring, Multichannel Sensor Acquisition, Laboratory Instrumentation, Embedded Control Systems, Data Acquisition Cards, Power and Battery Monitoring.
Industrial Process Monitoring
The AD974AR fits multichannel industrial process monitoring when several analog nodes must be sampled with one 16-bit converter. Its four-channel input multiplexer reduces the need for separate analog multiplexing hardware, while the 200 kSPS throughput supports fast sensor updates. The single 5 V supply simplifies system power distribution compared with a multi-rail acquisition design. Engineers should still add suitable input conditioning, protection, and anti-aliasing filtering because the verified excerpts do not specify the complete input impedance or acquisition-time limits.
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Multichannel Sensor Acquisition
The AD974AR is a practical choice for acquiring four sensor channels through a shared converter. Its 16-bit resolution supports fine measurement granularity, and its 200 kSPS conversion rate allows sampled data to be refreshed at a useful rate for slow and moderate-speed sensors. The integrated multiplexer is the main architectural benefit, because it lets a controller select among channels and serialize results through the high-speed serial interface. Sensor excitation, buffering, grounding, and calibration remain external design responsibilities.
推薦
Laboratory Instrumentation
The AD974AR can support laboratory and test systems that need four analog measurement inputs, 16-bit resolution, and a 200 kSPS conversion rate. The internal +2.5 V reference is useful for a controlled acquisition chain, while the serial interface can connect to a controller or data-capture logic. Input ranges of 0 V to +4 V, 0 V to +5 V, and ±10 V provide flexibility for different sensor amplitudes. Calibration, reference drift, source impedance, and timing must be evaluated against the full manufacturer datasheet.
推薦
Embedded Control Systems
The AD974AR can fit an embedded measurement system where four analog channels must be converted before control decisions are made. Its single 5 V supply, internal 2.5 V reference, and serial interface reduce the number of separate external blocks, while 16-bit resolution provides a useful numerical format for closed-loop monitoring. The design should include a defined acquisition sequence, digital settling time, and protection against transient industrial inputs. The verified data does not establish the exact serial protocol or absolute timing, so firmware must follow the datasheet.
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Data Acquisition Cards
The AD974AR is relevant to legacy data-acquisition cards that already use a 28-pin SOIC footprint and require four 16-bit channels at 200 kSPS. Its integrated multiplexer and +2.5 V reference can simplify board-level design compared with discrete converter solutions. A replacement or redesign should preserve the serial interface and verify every pin function, supply level, analog range, and acquisition timing. Because the retrieved product results identify the device as obsolete, board builders should assess availability and long-term sourcing before new production.
推薦
Power and Battery Monitoring
The AD974AR can be evaluated for multi-point voltage monitoring where several rails or battery cells must be digitized through a common converter. The 16-bit resolution and 200 kSPS sampling rate provide a combination that may suit monitoring tasks, while the selectable input ranges include a unipolar 0 V to +5 V option. A practical implementation still needs resistor dividers, input filtering, cell balancing protection, and a safe common-ground strategy. The converter's 5 V supply should be isolated or regulated according to the battery-system voltage and safety requirements.
推薦
推薦產品摘要
工程參考資料，適用於 AD974AR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | AD974BR | AD974BRZ | AD974BNZ |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-pin SOIC | 28-pin SOIC - exact package verification required | 28-pin SOIC - exact package verification required | 28-pin SOIC - exact package verification required |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit |
| Sampling Rate | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS |
| Input Channels | 4 channels | 4 channels | 4 channels | 4 channels |
| Supply | 5 V single supply | 5 V single supply | 5 V single supply | 5 V single supply |
| Input Ranges | 0 V to +4 V, 0 V to +5 V, or ±10 V | 0 V to +4 V, 0 V to +5 V, or ±10 V | 0 V to +4 V, 0 V to +5 V, or ±10 V | 0 V to +4 V, 0 V to +5 V, or ±10 V |
| Internal Reference | +2.5 V | +2.5 V | +2.5 V | +2.5 V |
| Interface | High-speed serial interface | High-speed serial interface | High-speed serial interface | High-speed serial interface |
主要差異化特點
- Four-channel integration (對比AD974BR)
- 200 kSPS throughput (對比AD974BNZ)
- Single 5 V integration (對比AD974BRZ)
- Legacy board reuse (對比AD974BR)
設計說明
Route analog inputs and reference connections close to the AD974AR and keep them away from the high-speed serial lines. Place input filtering, protection, and settling components where they can connect directly to the relevant pins rather than sharing long traces with digital return currents. The verified excerpts do not provide the complete recommended layout, so the manufacturer datasheet and reference circuit should remain the controlling design documents.
Treat the serial interface as a timing-sensitive digital signal and verify clock levels, data valid timing, and settling behavior with the full datasheet. Because the supplied excerpts do not include the complete interface timing table or logic thresholds, do not infer them from the 200 kSPS headline rate. Use controlled-impedance routing where appropriate and add adequate ground-return continuity beneath high-speed traces.
Do not assume that every ±10 V source can be connected directly to the converter input. Confirm the selected input-range configuration, external attenuation, source impedance, overvoltage protection, and grounding in the AD974 datasheet. The AD974AR is identified as obsolete in the retrieved results, so second sourcing should include a formal equivalence review rather than relying only on the family name or a distributor cross-reference listing.
合規資訊
The supplied product and distributor excerpts do not provide verified RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations. Compliance should be confirmed with Analog Devices or an authorized distributor for the exact ordering code.