AD977CNZ - 16-Bit 100 kSPS SAR ADC | Analog Devices
MPN： AD977CNZ ✓ 啟用中AD977CNZ 概覽
An ADC converts an analog input voltage into a digital code for measurement, control, recording, or signal processing. The AD977 belongs to the successive-approximation ADC family within the broader ADC/DAC and data-converter hierarchy. Its SAR architecture repeatedly compares the sampled input with a internally generated reference, making it suitable for applications requiring accurate conversion without the complexity of flash conversion.
Key specifications include 16-bit resolution, one analog input, a 100 kSPS sampling rate, and operation from a single 5 V rail. Maximum power dissipation is 100 mW, supporting low-power acquisition systems. The supported operating-temperature range is -40°C to 85°C, while the 20-PDIP package is supplied in a tube for through-hole PCB assembly.
Internally, the AD977 combines a switched-capacitor ADC, a 2.5 V internal reference, and a high-speed serial interface. Factory calibration minimizes offset, gain, and linearity errors, while listed AC testing includes signal-to-noise ratio and total harmonic distortion performance. The AD977 family provides 100 kSPS throughput, whereas the related AD977A family provides 200 kSPS.
Typical uses include industrial process measurement, instrumentation, laboratory data acquisition, audio and low-frequency waveform sampling, sensor-interface systems, and embedded control platforms. The 100 kSPS rate is appropriate for acquiring slowly changing or moderate-bandwidth analog signals rather than high-frequency communications waveforms.
Designers should provide a stable 5 V supply, observe the analog and reference grounding requirements, and validate input range and acquisition timing against the manufacturer datasheet. Because the serial interface, reference behavior, conversion timing, and digital signaling remain important to system accuracy, firmware and PCB validation should be completed before production release.
This product page consolidates verified manufacturer and distributor specifications, package details, availability references, and selection guidance. It also distinguishes the AD977CNZ from the faster AD977A family and clearly identifies where equivalent drop-in replacement data was not established by the supplied cross-reference evidence.
直接替換替代品，適用於 AD977CNZ — 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。
AD977CNZ 最大額定值與電氣特性
| 解析度 | 16 bit |
| Input Count | 1 input |
| Architecture | Successive approximation (SAR) |
| Throughput Rate | 100 kSPS |
| 供應電壓 | 5 V |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Internal Reference Voltage | 2.5 V |
| Maximum Power Dissipation | 100 mW |
| 工作溫度範圍 | -40°C to 85°C |
| Data Interface | Serial SPI |
| 封裝 | 20-PDIP (0.300 inch, 7.62 mm) |
| 安裝類型 | Through-hole |
| Packaging | Tube |
| Calibration | Factory calibrated |
| DC and AC Performance | Offset, gain, linearity, SNR, and THD tested |
| Analog Supply | Single 5 V operation |
AD977CNZ 20-pdip (0.300 inch, 7.62 mm) 腳位配置指南
AD977CNZ（20-pdip (0.300 inch, 7.62 mm) 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： AD977CNZ.
請參閱 資料表 以查看完整腳位配置。
典型應用
AD977CNZ 適用於 6 應用s: Industrial Process Measurement, Laboratory Data Acquisition, Audio and Waveform Sampling, Sensor Interface Systems, Embedded Control and Monitoring, Power and Equipment Monitoring.
Industrial Process Measurement
The AD977CNZ fits industrial process-monitoring systems that convert slowly changing pressure, temperature, or level signals into 16-bit digital measurements. Its 100 kSPS throughput provides more than adequate conversion bandwidth for many sensor-conditioning systems, while the single 5 V supply simplifies power architecture. The internal 2.5 V reference supports repeatable operation without an external reference circuit. Engineers should still account for sensor excitation, common-mode voltage, protection networks, grounding, and calibration when connecting industrial transducer outputs.
Laboratory Data Acquisition
The AD977CNZ is appropriate for laboratory and benchtop measurement systems that prioritize resolution and predictable serial data transfer over maximum conversion speed. Its 16-bit SAR architecture samples at 100 kSPS, providing ample bandwidth for many general-purpose analog channels, while maximum power dissipation is limited to 100 mW. The 20-PDIP through-hole package simplifies insertion into prototype boards. Firmware must implement the documented serial interface timing and correctly handle conversion latency and data-valid signaling.
Audio and Waveform Sampling
The AD977CNZ can be used for low-frequency audio, control, and waveform acquisition where the required bandwidth fits within its 100 kSPS throughput. The 16-bit resolution provides substantially more code levels than an 8-bit converter and can improve measurement fidelity when the analog front end is properly conditioned. Factory calibration addresses offset, gain, and linearity errors, while SNR and THD are among the tested performance characteristics. Aliasing, input bandwidth, settling time, and digital reconstruction must still be managed at the system level.
Sensor Interface Systems
The AD977CNZ is suitable for digitizing outputs from bridge, potentiometric, and low-bandwidth transducer front ends. Its single-input architecture makes it appropriate for dedicated measurement channels rather than simultaneous multi-channel acquisition without external multiplexing. The 5 V operating supply and internal 2.5 V reference simplify system partitioning, and the 100 kSPS rate supports rapid conversion in many control loops. The analog input must remain within the manufacturer-specified range, and excitation drift and ground potentials require careful PCB treatment.
Embedded Control and Monitoring
The AD977CNZ suits embedded monitoring controllers that need higher-resolution analog measurements than a low-cost internal controller ADC may provide. A 100 kSPS conversion rate allows the controller to sample several slow control or diagnostic channels through multiplexing if required. The serial interface is appropriate for communication with a microcontroller or digital controller, while the 20-PDIP package is useful where a through-hole prototype or serviceable module is preferred. Software should include range checks, saturation handling, and conversion-status synchronization.
Power and Equipment Monitoring
The AD977CNZ can serve as the measurement converter in equipment that monitors slow power-system variables, battery states, or analog subsystem health. Its 16-bit resolution can preserve small changes in a conditioned voltage, and the 100 kSPS rate supports event monitoring and closed-loop updates. The converter's 100 mW maximum power dissipation helps limit its impact on the monitored system. Accurate results still depend on a stable 5 V source, suitable input conditioning, calibrated scaling, and isolation where the monitored node presents a high common-mode voltage.
工程參考資料，適用於 AD977CNZ — 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 | AD977ANZ |
|---|---|---|
| Package | 20-PDIP (0.300 inch, 7.62 mm) | 20-PDIP (0.300 inch, 7.62 mm) |
| Brand | Analog Devices | Analog Devices |
| Resolution | 16 bit | 16 bit |
| Throughput Rate | 100 kSPS | 200 kSPS |
| Architecture | Successive approximation (SAR) | Successive approximation (SAR) |
| Input Count | 1 input | 1 input |
| Supply Voltage | 5 V | 5 V |
| Internal Reference | 2.5 V | 2.5 V |
主要差異化特點
- Lower throughput than the AD977A family (對比AD977ANZ)
- Match to the original 20-PDIP supply chain (對比AD977ANZ)
- Lower power ceiling (對比AD977ANZ)
設計說明
Power the AD977CNZ from a stable single 5 V rail within the documented 4.75 V to 5.25 V range. Place the recommended bypass capacitors close to the supply pins and keep analog return current separate from noisy digital return paths. The converter's maximum dissipation is 100 mW, but usable system performance still depends on supply-noise rejection, grounding, reference stability, and adequate headroom for the analog input.
Route the analog input away from digital clock and serial-interface traces, and use a compact, guarded layout around the converter. Treat the internal 2.5 V reference and analog signal path as sensitive nodes, minimize loop area, and provide a low-impedance ground connection. For the 20-PDIP implementation, observe the manufacturer's pin orientation and avoid long parallel runs between adjacent digital outputs and the analog input.
Do not interpret a 100 kSPS throughput specification as unlimited input bandwidth. The input must remain within the specified range, and sampling at 100 kSPS requires appropriate anti-aliasing behavior for the signal bandwidth. Firmware must also follow the documented conversion latency, data-valid timing, and serial clock requirements; incorrect read timing can create apparently random or duplicated codes.
合規資訊
The supplied verified data does not contain explicit compliance declarations for AD977CNZ. No RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status was inferred.
