AD974BRSZ - 16-Bit 4-Channel ADC | Analog Devices
MPN： AD974BRSZ ✓ 啟用中AD974BRSZ 概覽
An ADC, or analog-to-digital converter, converts continuous analog voltages into digital codes for processing, measurement, or transmission. The AD974 belongs to the data-acquisition-system hierarchy: its internal four-channel multiplexer routes selected analog inputs to a successive-approximation, switched-capacitor ADC, while the serial interface transfers conversion results to a digital controller. This integration reduces the number of separate front-end components required in multichannel measurement systems.
The AD974BRSZ combines 16-bit resolution with a maximum conversion rate of 200 ksps. Its four-channel multiplexer supports simultaneous acquisition sequencing, while the internal 2.5 V reference provides a stable conversion baseline. Operation from a single 5 V supply simplifies system power design, and the integrated power-down mode can reduce consumption when measurements are not continuously required.
Internally, the converter uses a successive-approximation, switched-capacitor architecture. Successive-approximation ADCs determine each output code through a sequence of internal comparisons, providing a practical combination of resolution, conversion speed, and power consumption. The high-speed serial interface is designed to reduce the number of interconnects required when the converter communicates with a digital acquisition system.
Typical uses include industrial process monitoring, instrumentation, laboratory data acquisition, communications equipment, and embedded measurement systems. Four analog channels are particularly useful when monitoring several related signals, such as temperature, pressure, position, and analog control feedback. The accepted input ranges make the converter applicable to unipolar sensor outputs as well as bipolar instrumentation signals.
A critical design consideration is preserving the integrity of each analog input through properly terminated PCB traces, low-noise references, and appropriate source-impedance networks. The analog and digital return paths should be arranged carefully to reduce conversion error and coupling between the four measured channels. The manufacturer datasheet should be used when assigning the 28 package pins and configuring operating modes.
This page combines the manufacturer specifications with practical ADC design guidance, package information, application fit, and same-family ordering alternatives. It is intended to help engineers identify the correct interface, input range, package, and operating conditions before integrating the AD974BRSZ into a measurement design.
直接替換替代品，適用於 AD974BRSZ — 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： AD974BRSZ （相同外形與佔位） — 差異在於 Package, Supply Voltage, Power-Down Mode, Internal Reference Voltage, ADC Resolution.
AD974ARZ
✅ 直接替換聯絡詢價
查看資料表 →AD974BRZ
✅ 直接替換聯絡詢價
查看資料表 →AD974BRS
✅ 直接替換聯絡詢價
查看資料表 →AD974ARSZ
✅ 直接替換📋 參考替代品（不在目錄中）
AD974BRSZ 最大額定值與電氣特性
| Product Type | 4-channel data-acquisition ADC |
| 解析度 | 16 bit |
| Maximum Sampling Rate | 200 ksps |
| Number of Analog Input Channels | 4 channels |
| Converter Architecture | Successive-approximation switched-capacitor ADC |
| 供應電壓 | 5 V |
| 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 to +10 V |
| Digital Interface | Serial interface |
| Analog Input Multiplexer | 4-channel internal multiplexer |
| Power-Down Mode | Yes |
| Power Supply Count | 1 |
| 封裝 | 28-pin SSOP |
| 安裝類型 | Surface mount |
AD974BRSZ 28-pin ssop 腳位配置指南
AD974BRSZ（28-pin ssop 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： AD974BRSZ.
請參閱 資料表 以查看完整腳位配置。
典型應用
AD974BRSZ 適用於 6 應用s: Industrial Process Monitoring, Laboratory Data Acquisition, Sensor Signal Conditioning, Communications Equipment, Medical and Diagnostic Instrumentation, Power and System Feedback Monitoring.
Industrial Process Monitoring
The AD974BRSZ fits four-channel industrial process monitoring because it combines a 16-bit converter, 200 ksps sampling capability, and an internal multiplexer in one 28-pin SSOP package. It can sequence pressure, temperature, flow, and valve-feedback signals through one conversion core. Operating from a single 5 V supply simplifies system power distribution, while the selectable 0 V to 4 V, 0 V to 5 V, or ±10 V ranges support different sensor and instrumentation outputs. Designers should condition each input, maintain a low-noise ground reference, and verify the temperature grade against the installation environment.
推薦
Laboratory Data Acquisition
The AD974BRSZ is well suited to laboratory data-acquisition systems requiring 16-bit resolution across four analog inputs at up to 200 ksps. Its internal multiplexer reduces the number of converters required when measuring several related channels, while the integrated 2.5 V reference provides a defined conversion reference. The serial interface limits digital interconnect count and supports communication with acquisition logic. For bench equipment, use short analog traces, stable source impedances, and separate analog and digital return paths to avoid introducing channel-dependent errors or reference disturbance.
推薦
Sensor Signal Conditioning
AD974BRSZ can digitize outputs from multiple low-speed or moderate-speed sensors when the design needs more resolution than a lower-bit mixed-signal controller provides. Its four-channel architecture supports sequential sampling of resistive, current-output, or voltage-output sensors, and its 16-bit codes provide substantially finer numerical granularity than an 8-bit converter. The 200 ksps capability leaves headroom for faster sampling or channel-switching overhead. The internal 2.5 V reference helps establish repeatable conversion, but external input networks must preserve signal range and control settling time after each multiplexer transition.
推薦
Communications Equipment
The AD974BRSZ supports communications equipment that must monitor four analog control, feedback, or supply-related signals with 16-bit resolution. Its 200 ksps maximum rate accommodates moderate-bandwidth acquisition, while the serial interface provides a compact connection to digital signal-processing hardware. A single 5 V supply and integrated 2.5 V reference simplify implementation where multiple precision rails would otherwise be required. High-frequency switching equipment should place the converter away from inductors and high-current paths, and should validate reference settling and analog return paths on the assembled PCB.
推薦
Medical and Diagnostic Instrumentation
AD974BRSZ can serve as the acquisition component in diagnostic and medical instrumentation when four low-bandwidth analog channels require consistent 16-bit conversion. The internal multiplexer, 2.5 V reference, and serial interface reduce the component count in a compact instrument, while 200 ksps is sufficient for many physiological or analytical signals with appropriate anti-alias filtering. Medical designs must separately validate electrical isolation, leakage, patient-protection architecture, applicable regulatory requirements, and the exact operating-temperature grade. The converter's core ADC specifications alone do not establish compliance for a finished medical device.
推薦
Power and System Feedback Monitoring
The AD974BRSZ can monitor four power-system feedback signals, including scaled supply voltages, load currents, temperature channels, and control-system status in industrial or server equipment. Sixteen-bit resolution improves visibility into small analog variations, and the 200 ksps rate is adequate for many supervisory and diagnostic loops. The selectable input ranges allow design flexibility, but each signal still requires attenuation, filtering, current-to-voltage conversion, or other conditioning. Keep high-di/dt power paths physically separated from the converter and use a quiet ground strategy to prevent switching noise from appearing as measurement error.
推薦
推薦產品摘要
工程參考資料，適用於 AD974BRSZ — 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 | AD974ARZ | AD974BRZ | AD974BRS | AD974ARSZ | AD974BR |
|---|---|---|---|---|---|---|
| Package | SSOP-28 | SSOP-28 | SSOP-28 | SSOP-28 | SSOP-28 | SSOP-28 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Maximum Sampling Rate | 200 ksps | 200 ksps | 200 ksps | 200 ksps | 200 ksps | 200 ksps |
| Number of Channels | 4 channels | 4 channels | 4 channels | 4 channels | 4 channels | 4 channels |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Supported 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 |
| Digital Interface | Serial | Serial | Serial | Serial | Serial | Serial |
| Converter Architecture | Successive-approximation switched-capacitor ADC | Successive-approximation switched-capacitor ADC | Successive-approximation switched-capacitor ADC | Successive-approximation switched-capacitor ADC | Successive-approximation switched-capacitor ADC | Successive-approximation switched-capacitor ADC |
主要差異化特點
- Four-channel integration reduces external converter count (對比AD974ARZ)
- Integrated reference simplifies precision acquisition (對比AD974BRZ)
- Serial interface minimizes digital connection count (對比AD974BRS)
- Power-down operation supports intermittent acquisition (對比AD974ARSZ)
設計說明
Place the 28-pin SSOP close to the source of the analog signals and route each input away from clocks, inductors, switching-node copper, and high-current return paths. The manufacturer data sheet should guide the placement of input and reference components. Use a continuous ground plane for the converter and preserve an uninterrupted return beneath or directly beneath the device, since split-plane crossings can create conversion-dependent errors that are difficult to distinguish from ADC accuracy limitations.
Verify input settling after every multiplexer transition, particularly when sensors have high source impedance or long PCB traces. The four-channel multiplexer means each channel may present a different source impedance and settling history. Use the manufacturer conversion timing and acquisition sequence to establish the required acquisition interval, and add suitable source buffers or passive networks when the sensor cannot settle within that interval. Also place anti-alias filtering before the converter rather than after digitisation.
Use the power and decoupling arrangement specified by the Analog Devices AD974 manufacturer data sheet, placing required bypass capacitors close to their corresponding device pins. Keep the 5 V supply path narrow enough to reduce susceptibility to shared impedance effects but wide enough for transient current. Separate noisy digital return current from sensitive analog references, and inspect the assembled board for supply ripple and reference settling before interpreting poor conversion results as converter nonlinearity.
Do not treat the AD974 family suffix codes as electrically interchangeable without checking the exact ordering information. AD974ARZ, AD974BRZ, AD974BRS, AD974ARSZ, and AD974BR are same-family candidates, but temperature grade, package marking, qualification, and ordering details still require confirmation. When replacing AD974BRSZ, compare the complete manufacturer data sheet, verify the 28-pin SSOP footprint, and confirm interface timing, input range configuration, power-down behavior, and operating limits.
合規資訊
The checked manufacturer descriptions identify the electrical function and ordering code but do not explicitly state the requested compliance attributes. These fields must be confirmed from the exact Analog Devices product documentation or current manufacturer declarations before use in a regulated or restricted-environment design.