AD977CRZ - 16-Bit 100 kSPS SAR ADC | Analog Devices
料号： AD977CRZ ✓ 量产中AD977CRZ 概述
An ADC is a data-acquisition IC that converts an analog voltage into a digital number for processing by a microcontroller, DSP, FPGA, or industrial controller. The AD977 belongs to the SAR ADC category, where a successive-approximation internal DAC drives a comparator until the converted result matches the analog input. SAR converters are useful when moderate conversion speed, low power, and simple serial connectivity are more important than maximum sampling throughput.
Key features include 16-bit resolution, a 100 kSPS conversion rate, and operation from one 5 V supply. The verified data also identifies a maximum power dissipation of 100 mW, a power-down mode, and a serial SPI data interface. These characteristics make the AD977CRZ suitable for industrial instrumentation, process-control acquisition, data loggers, and embedded measurement systems where sampled bandwidth is measured in hundreds of hertz to tens of kilohertz.
The device uses a successive-approximation conversion architecture rather than a flash, pipeline, or sigma-delta architecture. Each conversion requires repeated comparison of the input against an internally generated approximation. This architecture supports a relatively straightforward serial interface and low power dissipation, while the 16-bit word length provides substantially more code levels than an 8-bit converter. The single 5 V supply also simplifies analog and digital system integration when the selected interface and reference arrangement remain compatible.
Typical uses include programmable laboratory instruments, temperature and pressure acquisition chains, factory-control modules, battery-powered field recorders, and embedded condition-monitoring equipment. In these systems, the ADC can be paired with sensors and instrumentation amplifiers, while its serial interface connects directly to a low-speed microcontroller or embedded control system.
A key design consideration is that analog-input conditioning, reference quality, grounding, and digital-interface timing can be as important as the nominal converter resolution. Designers should follow the Analog Devices AD977 product page and datasheet for the complete electrical characteristics, pin functions, acquisition timing, and recommended application circuit rather than inferring missing details from distributor summaries.
This page consolidates the verified manufacturer and distributor information, separates documented facts from unavailable data, and adds practical selection guidance that is not normally presented together on a distributor listing.
直接替换替代料： AD977CRZ ——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： AD977CRZ （相同外形与封装尺寸） ——差异在于 Package, RoHS Status.
AD977CRZ 最大额定值与电气特性
| Converter Type | Successive-approximation ADC (SAR) |
| 分辨率 | 16 bit |
| 采样率 | 100 kSPS |
| Number of Analog Inputs | 1 input |
| 电源电压 | 5 V |
| Operating Supply Range | 4.75 V to 5.25 V |
| Data Interface | Serial, SPI-compatible |
| 封装 | 20-SOIC, 7.50 mm width |
| Package Type | 20-lead SOIC |
| 安装类型 | Surface mount |
| 工作温度 | -40 °C to 85 °C |
| Temperature Grade | Industrial |
| Maximum Power Dissipation | 100 mW |
| Power-Down Mode | Supported |
| RoHS 状态 | unknown |
| REACH Status | unknown |
AD977CRZ 20-lead soic 引脚配置指南
AD977CRZ（20-lead soic 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： AD977CRZ.
请参阅 数据手册 以查看完整引脚配置。
典型应用
AD977CRZ 适用于 6 应用s: Industrial Process Measurement, Data Logging and Monitoring, Precision Sensor Acquisition, Programmable Laboratory Instrument, Condition Monitoring Systems, Embedded Control and Acquisition.
Industrial Process Measurement
The AD977CRZ fits single-channel industrial process measurement because it provides 16-bit conversion resolution at up to 100 kSPS from one analog input. It can acquire a conditioned pressure, temperature, or level signal while operating from the verified 4.75 V to 5.25 V supply range. The one-input SAR architecture simplifies multiplexing around the converter, while the 20-lead SOIC package supports conventional surface-mount assembly. Designers should pair it with suitable input buffering and grounding, and should consult the manufacturer datasheet for the exact input range, reference implementation, and acquisition timing before finalizing the analog front end.
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Data Logging and Monitoring
The AD977CRZ is appropriate for data loggers that periodically record one analog measurement at rates up to 100 kSPS. Its 16-bit word length preserves substantially more numerical detail than an 8-bit converter, while the serial SPI-compatible interface can connect to a microcontroller or embedded controller without a parallel data bus. The verified maximum power dissipation of 100 mW is useful for compact field equipment, and the available power-down mode can reduce consumption during inactive intervals. Practical implementation still requires a suitable reference, input-conditioning network, and software that observes the converter's acquisition and serial-transfer timing.
推荐
Precision Sensor Acquisition
The AD977CRZ can serve as the final conversion stage for a precision sensor chain when the conditioned sensor output remains within the converter's supported input range. Its 16-bit resolution supports fine-grained measurement, and the 100 kSPS rate is more than adequate for many temperature, pressure, strain, and chemical sensors sampled at moderate rates. The single analog input makes channel expansion possible with an external multiplexer, although every mux, amplifier, and reference selection affects the effective accuracy. The manufacturer datasheet should define the required sensor amplifier, bypass capacitors, reference voltage, and grounding arrangement.
推荐
Programmable Laboratory Instrument
For programmable laboratory instruments, the AD977CRZ provides a compact 16-bit conversion stage for slowly varying or repetitively sampled analog inputs. Its 100 kSPS throughput supports responsive measurements without requiring the 200 kSPS capability of the AD977A. The SPI-compatible serial interface can connect to an embedded controller, while the 20-lead SOIC package is straightforward to assemble on a mixed analog and digital instrument board. For low-level instrumentation, pay particular attention to reference stability, analog trace routing, grounding, and the acquisition settling requirements documented by Analog Devices.
推荐
Condition Monitoring Systems
The AD977CRZ is suitable for condition-monitoring modules that periodically capture vibration, strain, or electrical-health signals through one conditioned analog channel. Its 16-bit resolution and 100 kSPS throughput provide a useful balance between measurement granularity and low power, with maximum power dissipation listed as 100 mW. The power-down function can help a battery-powered monitor conserve energy between measurement windows. Exact usable bandwidth depends on the complete analog path and conversion timing, so designers should verify the official acquisition characteristics rather than equating the sampling rate directly with final signal bandwidth.
推荐
Embedded Control and Acquisition
The AD977CRZ can serve as an analog measurement peripheral for an embedded controller that already supports an SPI-compatible master interface. It converts one analog input into a 16-bit digital result at up to 100 kSPS and operates from the verified 4.75 V to 5.25 V supply range. This simplifies designs requiring occasional high-resolution sampling without adding a parallel bus or a separate high-rate converter. Firmware must handle serial data timing, conversion-status signaling, and calibration, while the hardware must provide correct decoupling and a clean analog return path between the converter and the controller.
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推荐产品汇总
工程参考数据： AD977CRZ ——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 | AD977BRZ |
|---|---|---|
| Package | 20-SOIC | 20-SOIC |
| Brand | Analog Devices | Analog Devices |
| Resolution | 16 bit | 16 bit |
关键差异点
- Defined 100 kSPS throughput （对比 AD977A)
- Single-input conversion architecture （对比 AD977BRZ)
- Single-supply operation （对比 AD977BRZ)
设计说明
Use the manufacturer application circuit as the basis for input and reference layout. Place decoupling capacitors close to the supply and ground pins, keep sensitive analog traces short, and avoid routing digital serial signals beneath the analog input or reference network. The retrieved data confirms a 20-lead SOIC package but does not provide the exact pin map, so PCB design must use the official AD977 pin drawing rather than a generic SOIC-20 footprint assumption.
Treat the SPI-compatible interface as a digital timing problem in addition to an analog conversion problem. Confirm conversion latency, serial clock limits, data-valid behavior, and the controller's sampling edge from the official datasheet. Account for PCB trace capacitance, pull resistors where specified, and software buffering so that digital activity does not inject enough noise to undermine the intended 16-bit measurement resolution.
Do not assume that a 16-bit ADC automatically delivers 16 bits of useful system accuracy. Sensor noise, reference error, input-amplifier offset and noise, insufficient analog drive, and incorrect grounding can dominate the measurement chain. Verify the supported input range and reference configuration in the Analog Devices datasheet, then perform end-to-end calibration if the application requires accurate results close to the converter's resolution limit.
The verified maximum power dissipation is 100 mW, but that specification is not a substitute for evaluating the complete board's power budget. Use the actual single-supply operating voltage, conversion activity, digital-interface loading, and power-down duty cycle when comparing alternatives. Because no current consumption or quiescent-current values were supplied, those parameters require confirmation in the official manufacturer documentation before low-power design assumptions are finalized.
合规信息
The supplied manufacturer and distributor data identifies an industrial-grade ADC but does not provide explicit RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive-qualification statements.
