AD977BNZ - 16-Bit 100 kSPS SAR ADC | Analog Devices
MPN： AD977BNZ ✓ 啟用中AD977BNZ 概覽
An ADC is a data-conversion IC that converts an analog voltage into a digital code for processing by a microcontroller, DSP, or other digital system. The AD977 belongs to the SAR ADC family within the broader analog-to-digital converter and data-converter hierarchy. SAR conversion repeatedly compares the sampled input with an internally generated reference to determine successive bits of the 16-bit result.
Key features include 16-bit resolution, a 100 kSPS throughput rate, one analog input channel, a serial SPI interface, and single 5 V operation. Maximum power dissipation is 100 mW, while a dedicated power-down mode helps reduce consumption when conversions are not required. The converter is housed in a 20-pin PDIP package measuring approximately 0.300 inches wide, or 7.62 mm.
The AD977 uses a switched-capacitor successive-approximation architecture and includes an internal 2.5 V reference. Its serial interface reduces the number of signal connections compared with a parallel-output ADC, making the device suitable for space-constrained instrumentation where conversion rate requirements are below 100 kSPS. The analog input remains single-ended according to the product specifications.
Typical applications include industrial process measurement, sensor signal acquisition, laboratory instrumentation, factory automation, and embedded control systems. These uses benefit from the combination of 16-bit resolution, serial connectivity, and a moderate conversion rate rather than the very high throughput required by waveform capture or communications receivers.
When designing around the AD977BNZ, preserve adequate input-headroom margin for the full 4.75 V to 5.25 V supply range and follow the manufacturer's grounding and reference recommendations. Confirm that 100 kSPS meets the application's acquisition rate and allow for acquisition, conversion, and serial-transfer time when calculating end-to-end throughput.
This product page combines the AD977BNZ electrical characteristics, package information, replacement analysis, and practical design guidance to help engineers evaluate the converter before integrating it into a new analog measurement system.
直接替換替代品，適用於 AD977BNZ — 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： AD977BNZ （相同外形與佔位） — 差異在於 Power-Down Mode.
AD977BNZ 最大額定值與電氣特性
| 解析度 | 16 bit |
| Conversion Architecture | Successive approximation register (SAR) |
| 取樣率 | 100 kSPS |
| Number of Input Channels | 1 channel |
| Input Type | Single input |
| Data Interface | Serial SPI-compatible interface |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Internal Reference Voltage | 2.5 V |
| Maximum Power Dissipation | 100 mW |
| Power-Down Mode | Supported |
| 工作溫度範圍 | -40°C to +85°C |
| Package Type | 20-pin PDIP |
| Package Width | 0.300 inch (7.62 mm) |
| 安裝類型 | Through-hole PDIP |
| Packaging | Tube |
AD977BNZ 0.300 inch (7.62 mm) 腳位配置指南
AD977BNZ（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： AD977BNZ.
請參閱 資料表 以查看完整腳位配置。
典型應用
AD977BNZ 適用於 6 應用s: Industrial Sensor Acquisition, Process Control Loops, Laboratory Instrumentation, Factory Automation Controllers, Embedded Environmental Monitoring, Audio and Communication Control.
Industrial Sensor Acquisition
The AD977BNZ suits sensor acquisition systems that require 16-bit measurement resolution but operate below 100 kSPS. Its single analog input and serial SPI-compatible interface reduce the number of interconnections compared with a parallel-output converter, which is useful in compact sensor interface boards. According to the AD977 datasheet, the converter operates from 4.75 V to 5.25 V and includes an internal 2.5 V reference. The analog front end should provide enough acquisition and settling time to satisfy the ADC's sampling requirements.
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Process Control Loops
AD977BNZ can digitize pressure, temperature, level, and flow signals in industrial process-control equipment where a moderate sampling rate is sufficient. Its 16-bit output provides 65,536 numerical codes, while the 100 kSPS throughput supports frequent loop updates. According to Analog Devices product documentation, the device has one analog input, a serial interface, and a single 5 V supply. Design the input conditioning, protection, and grounding so sensor transients and supply noise do not compromise the measured code.
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Laboratory Instrumentation
The AD977BNZ is appropriate for bench instruments that measure relatively slow analog signals and require more resolution than a basic control ADC. Its serial interface simplifies connection to an embedded controller, while the 20-pin PDIP package is convenient for through-hole laboratory prototypes. According to the AD977 datasheet, maximum power dissipation is 100 mW and the operating-temperature range extends from -40°C to +85°C. The instrument should still provide clean grounding, stable excitation, and a suitable analog input range.
推薦
Factory Automation Controllers
AD977BNZ can serve as the measurement converter in factory automation equipment that reads slowly changing analog process conditions. The 100 kSPS rate is well suited to periodic sensor polling, and the single-input serial architecture supports a compact controller PCB. According to the AD977 datasheet, the ADC operates from a single 5 V supply and provides a power-down mode for inactive periods. Choose external filtering and input protection appropriate to the industrial wiring environment.
推薦
Embedded Environmental Monitoring
The AD977BNZ can digitize outputs from environmental, gas, and position sensors in a compact monitoring node. Its 16-bit code width and 100 kSPS throughput permit periodic measurements without the overhead of a high-speed waveform converter, while serial communication fits embedded systems. According to Analog Devices documentation, the converter includes an internal 2.5 V reference and accepts a 4.75 V to 5.25 V supply. Calibrate the sensor chain and account for reference and analog-path error during long-term measurements.
推薦
Audio and Communication Control
AD977BNZ can be evaluated for supervisory control, bias monitoring, or slow auxiliary signal acquisition within audio and communication equipment. Its 100 kSPS throughput is sufficient for many supervisory channels but not for full-bandwidth audio capture. According to the AD977 datasheet, the serial interface helps minimize wiring in a dense control assembly and the power-down mode can reduce activity during idle periods. The converter should be isolated from high-energy signal paths and supplied from a suitably quiet rail.
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推薦產品摘要
工程參考資料，適用於 AD977BNZ — 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 | AD977BN |
|---|---|---|
| Brand | Analog Devices | Analog Devices |
| Package | 20-pin PDIP | 20-pin PDIP - same package |
| Resolution | 16 bit | 16 bit |
| Sampling Rate | 100 kSPS | 100 kSPS |
| Input Channels | 1 channel | 1 channel |
| Conversion Architecture | SAR | SAR |
| Supply Voltage | 4.75 V to 5.25 V | 5 V single supply |
| Data Interface | Serial SPI-compatible | Serial interface |
| Internal Reference | 2.5 V | 2.5 V |
主要差異化特點
- Maintains the documented 16-bit conversion resolution (對比AD977BN)
- Preserves the same 100 kSPS throughput class (對比AD977BN)
- Uses the same 20-pin PDIP physical format (對比AD977BN)
設計說明
Follow the AD977 datasheet pin-description table when assigning the 20 PDIP nets and preserve the converter's recommended grounding arrangement. Keep the analog input trace short, place input-conditioning components close to the relevant pins, and route digital control and serial-data signals away from sensitive input paths. The package is a through-hole PDIP format, so check component spacing, connector orientation, and available board area before finalizing the mechanical layout.
Design the 5 V supply so it remains within the specified 4.75 V to 5.25 V range during startup, load changes, and temperature operation. Place the bypass capacitors specified by the manufacturer close to the supply and ground pins, and verify startup behavior before enabling repeated conversions. The power-down mode can reduce activity when continuous acquisition is unnecessary, but its effect on output validity and serial timing should be checked in firmware.
Account for acquisition time, input-settling time, conversion time, and serial-transfer time when determining real throughput. The published 100 kSPS specification should not be interpreted as permission to start every new sample before the previous conversion and acquisition have completed. Use the manufacturer's timing diagram to define control and data-valid behavior, and avoid driving the serial bus from multiple devices unless the interface arrangement explicitly supports it.
Do not select AD977BNZ solely by resolution and sampling rate. Confirm the analog input range, reference arrangement, serial timing, and 20-pin PDIP pin assignments in the manufacturer datasheet before schematic capture. Also verify that the AD977BN replacement is acceptable for the intended temperature grade and production configuration. The internal 2.5 V reference does not eliminate the need to keep the analog input within its supported voltage range.
合規資訊
The AD977BNZ is an industrial-temperature analog converter. RoHS, REACH, lead-free, halogen-free, and conflict-minerals declarations were not identified in the product information, so those statuses remain unknown. AEC-Q100 qualification is not identified and is not applicable to the published industrial configuration.