AD974AN - 16-Bit 4-Channel 200kSPS ADC | Analog Devices
料号： AD974AN ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $54.0934 | $54.09 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
AD974AN 概述
An ADC is an analog-to-digital converter, a semiconductor that transforms continuous analog voltage signals into digital codes for processing, measurement, or transmission. The AD974 belongs to the ADC hierarchy within data-conversion ICs and power-management-dependent signal-chain components. Its four-channel multiplexer allows one 16-bit ADC core to sample multiple analog inputs sequentially, reducing board area while preserving simultaneous data-acquisition capability.
Key features include 16-bit resolution, four multiplexed analog inputs, a 200 ksps conversion rate, a serial data interface, and a +2.5 V internal reference. The single +5 V supply simplifies system power architecture. Supported input ranges include 0 V to +4 V, 0 V to +5 V, and ±10 V, enabling the same converter family to serve unipolar industrial, instrumentation, and bipolar measurement systems.
The AD974 uses a successive-approximation, switched-capacitor conversion architecture. This architecture is appropriate for high-resolution, moderate-speed acquisition where a serial output is sufficient and per-channel simultaneous converters would add unnecessary cost and board space. The internal +2.5 V reference supports repeatable conversion behavior without requiring a separate reference circuit, although system accuracy still depends on appropriate analog conditioning, layout, and input-range configuration.
Typical applications include industrial process monitoring, sensor acquisition, laboratory measurement equipment, data logging, and embedded instrumentation. The 200 ksps sampling rate is well suited to continuously updated measurements, while 16-bit resolution supports applications requiring more detail than typical 8-bit or 12-bit converters. The four-channel input structure is particularly useful when several related signals must be scanned through a shared ADC.
Designers should account for input settling time, source impedance, reference accuracy, analog noise, and the sampling interval between multiplexed channels. Place input conditioning and decoupling close to the device, preserve clean grounding around the analog pins, and verify the configured input range against the source voltage. System-level error budget should also include multiplexer transition time and any external amplifier or sensor limitations.
直接替换替代料： AD974AN ——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： AD974AN （相同外形与封装尺寸） ——差异在于 Mounting Type, Package, Supply Voltage.
快速对比工具——选择替代料号进行并排对比：
AD974AR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$45.39 / 个
查看数据手册 →AD974ARZ
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AD974ARZ-RL
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AD974AR-REEL
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AD974AR-REEL7
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AD974AN 最大额定值与电气特性
| Product Type | 4-channel data acquisition system with serial interface |
| 分辨率 | 16 bit |
| 采样率 | 200 ksps |
| Number of Analog Input Channels | 4 channels |
| Converter Architecture | Successive-approximation switched-capacitor ADC |
| Internal Reference Voltage | +2.5 V |
| 电源电压 | +5 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 |
| Power-Down Mode | Supported |
| 接口 | Serial |
| 封装 | 28-pin DIP (0.600 inch, 15.24 mm) |
| 安装类型 | Through-hole |
| Analog Input Type | Single-ended or differential according to configured input range |
AD974AN 28-pin dip (0.600 inch, 15.24 mm) 引脚配置指南
AD974AN（28-pin dip (0.600 inch, 15.24 mm) 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： AD974AN.
请参阅 数据手册 以查看完整引脚配置。
典型应用
AD974AN 适用于 6 应用s: Industrial Process Monitoring, Precision Sensor Acquisition, Laboratory Measurement Equipment, Data Logging and Test Systems, Power and Battery Monitoring, Audio and Communication Equipment.
Industrial Process Monitoring
The AD974AN suits industrial process-monitoring systems that scan pressure, temperature, level, or flow-sensor signals through a shared converter. Its four-channel input multiplexer reduces the number of separate ADC channels, while 16-bit resolution preserves fine measurement detail and the 200 ksps capability supports fast sequential acquisition. The device accepts 0 V to +4 V, 0 V to +5 V, or ±10 V conditioned signals, allowing different sensor front ends to feed the same converter. In implementation, the multiplexer introduces a settling interval after every channel switch, so the firmware must preserve that acquisition time and the analog network must present a source impedance acceptable to the ADC.
推荐
Precision Sensor Acquisition
The AD974AN is useful for precision sensor acquisition when multiple analog outputs must be digitized for analysis or control. The 16-bit resolution is appropriate for sensors whose useful signal occupies only part of the converter's selected input range, while four multiplexed channels allow related variables to be sampled sequentially. The internal +2.5 V reference and single +5 V operation simplify the supporting power architecture. The key engineering consideration is source settling: sensor amplifiers and anti-alias filters should present low impedance and sufficient settling time, otherwise the multiplexed 200 ksps conversion capability may be reduced by errors captured during channel transitions.
推荐
Laboratory Measurement Equipment
The AD974AN can form the conversion core of laboratory and bench measurement equipment that combines precision, multichannel acquisition with manageable system complexity. Four analog inputs permit the instrument to measure a stimulus and associated feedback or reference channels, while 16-bit resolution supports detailed numerical results. The serial interface helps reduce parallel data-routing complexity, and the converter can be powered down when measurements are not in progress. Instrument designers should treat the ADC as only one error contributor: resistor-network accuracy, input leakage, reference behavior, clock quality, grounding, and the timing of the multiplexed channel sequence can materially affect displayed measurement precision.
推荐
Data Logging and Test Systems
The AD974AN supports compact data loggers and automated test systems that repeatedly sample a set of analog conditions. Its four-channel multiplexer and 200 ksps conversion rate permit each channel to be refreshed rapidly enough for many slow-moving or moderately dynamic measurements, while 16-bit data provides more resolution than conventional low-cost converters. The serial interface is useful in systems where wiring density and PCB area are constrained. During data acquisition, software must discard or account for samples associated with multiplexer transition, and calibration should include offset, gain, and reference contributions if measurements require traceability.
推荐
Power and Battery Monitoring
The AD974AN can digitize several power-system or battery-monitor signals when the design needs higher-resolution telemetry than a basic microcontroller ADC. The four inputs permit monitoring combinations such as pack voltage, cell voltage, current, or temperature after conditioning, and the 200 ksps conversion rate supports rapid scan-based telemetry. Its single +5 V supply is convenient for instrumentation electronics, while power-down mode can reduce consumption during inactive intervals. Safety and accuracy depend on external scaling, galvanic isolation, input filtering, and a carefully defined sampling schedule; the ADC must not be connected directly to hazardous voltages without appropriate protection.
推荐
Audio and Communication Equipment
The AD974AN can be applied in communication or audio-adjacent equipment for monitoring several control or envelope signals rather than directly digitizing high-bandwidth audio. Its 16-bit resolution is useful for accurate level and envelope measurement, and its four-channel input structure supports coordinated monitoring of multiple signals. The 200 ksps rate provides substantial oversampling relative to many low-frequency monitoring tasks. Because this is a sampled-data converter with a serial output, the host processor must recover the serial stream correctly, and the analog path should include anti-alias filtering. For full-bandwidth audio, the converter architecture and sampling rate would require separate assessment.
推荐
推荐产品汇总
工程参考数据： AD974AN ——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 | AD974AR | AD974ARZ | AD974ARZ-RL | AD974AR-REEL | AD974AR-REEL7 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-pin DIP (0.600 inch, 15.24 mm) | 28-pin DIP (0.600 inch, 15.24 mm) | 28-pin DIP (0.600 inch, 15.24 mm) | 28-pin DIP (0.600 inch, 15.24 mm) | 28-pin DIP (0.600 inch, 15.24 mm) | 28-pin DIP (0.600 inch, 15.24 mm) |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Sampling Rate | 200 ksps | 200 ksps | 200 ksps | 200 ksps | 200 ksps | 200 ksps |
| Input Channels | 4 channels | 4 channels | 4 channels | 4 channels | 4 channels | 4 channels |
| Internal Reference | +2.5 V | +2.5 V | +2.5 V | +2.5 V | +2.5 V | +2.5 V |
| Supply Voltage | +5 V | +5 V | +5 V | +5 V | +5 V | +5 V |
| Analog 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 | 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 |
| Power-Down Mode | Supported | Supported | Supported | Supported | Supported | Supported |
关键差异点
- Integrated four-channel multiplexing （对比 ADS8320E/2K5)
- 16-bit multichannel conversion （对比 AD9238BSTZ-40)
- Single +5 V architecture with internal reference （对比 ADS7768-1BCPZ)
- Through-hole 28-pin DIP implementation （对比 AD974BRSZ)
设计说明
Treat every multiplexer transition as an analog settling event. The verified AD974 architecture uses a four-channel input multiplexer ahead of one 16-bit switched-capacitor ADC, so the selected source must settle before conversion. Use low-impedance drivers, place the input network close to the device, and allow the required acquisition interval in the control sequence. If the source is high impedance, add a suitable buffer and account for its noise, offset, and settling behavior in the measurement error budget.
Separate analog and digital return paths carefully around the 28-pin through-hole device. Place the +5 V bypass capacitor at the supply pins with a short, low-inductance connection, and route the serial interface away from sensitive input nodes. Keep sensor inputs, input-range components, and reference-related circuitry away from clocks and fast digital traces. Because the exact pin assignments were not available in the supplied search extracts, verify the official AD974 datasheet before laying out the PCB rather than deriving connections from package position.
Do not confuse the supported ±10 V analog input range with a ±10 V supply requirement. The AD974AN operates from one +5 V supply, while external signal conditioning must safely translate bipolar or higher-voltage sensors into the selected input range. Also avoid assuming that four channels are sampled simultaneously: the internal multiplexer scans channels sequentially. Include acquisition delay, channel-settling time, and discarded first conversions where accuracy matters.
Use a clean, low-noise +5 V source because converter accuracy depends on supply behavior as well as the internal +2.5 V reference. Decouple the supply at the device, keep analog input returns quiet, and verify ground offsets under the full input bandwidth and digital activity. The available power-down mode can reduce consumption in intermittent systems, but firmware must restore the correct settling interval after wake-up before taking a valid measurement.
合规信息
The supplied verified data does not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable because the AD974AN is a general-purpose data-acquisition ADC rather than an automotive-qualified part in the supplied data.
