AD977AR - 16-Bit 100 kSPS Serial ADC | Analog Devices
MPN： AD977AR ✗ 停產AD977AR 概覽
An ADC is an analog-to-digital converter, a semiconductor that samples a continuous analog voltage and produces a corresponding numeric code for digital processing. AD977AR belongs to the successive-approximation ADC family, a type commonly used where moderate sampling rate, low power, compact packaging, and straightforward system integration are more important than very high conversion bandwidth. Its 16-bit resolution supports finely quantized measurements while the single 5 V supply simplifies system power architecture.
The verified features include a 16-bit conversion resolution, 100 kSPS throughput for AD977, and 200 kSPS throughput for AD977A. The device is factory calibrated, has unipolar and bipolar input-range options, supports 5 V and 3.3 V bipolar configurations as described in the retrieved datasheet material, and provides a power-down mode. Its switched-capacitor SAR architecture separates acquisition and conversion functions while retaining a compact, low-power implementation.
The AD977AR is suitable for industrial measurement, instrumentation, process control, sensor acquisition, data acquisition systems, and embedded control platforms. A system designer should select the input range and reference arrangement required by the analog signal, then validate conversion timing against the 100 kSPS device rating. The serial interface reduces package pin count and board area, but the host processor must support the required clocking and data protocol.
The main design consideration is analog signal conditioning. Keep the input within the selected unipolar or bipolar range, account for source impedance and sampling behavior, and provide stable reference and supply decoupling close to the device. For replacement decisions, the exact suffix, package, interface, input range, reference configuration, and timing must be checked rather than relying only on the AD977 family name.
This page combines the verified AD977 family specifications with application guidance, pin-level caveats, comparison placeholders, and procurement-oriented information. It is intended to help engineers identify whether the AD977AR matches a 16-bit, 100 kSPS, single 5 V ADC design and to locate the manufacturer datasheet and distributor listings before committing to a board or production release.
直接替換替代品，適用於 AD977AR — 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： AD977AR （相同外形與佔位） — 差異在於 Package, Supply Voltage, Throughput Rate, Mounting Type, Power-Down Mode.
AD977ARZ
✅ 直接替換聯絡詢價
查看資料表 →AD977AR-REEL
✅ 直接替換📋 參考替代品（不在目錄中）
AD977ABRZ
✅ 直接替換📋 參考替代品（不在目錄中）
AD977AR 最大額定值與電氣特性
| ADC Type | Successive-approximation switched-capacitor ADC |
| 解析度 | 16 bit |
| Input Channels | 1 input |
| Input Type | Single ended |
| Throughput Rate | 100 kSPS for AD977; 200 kSPS for AD977A |
| 供應電壓 | 5 V single supply |
| Internal Reference | 2.5 V internal reference |
| Reference Type | External or internal |
| Data Interface | High-speed serial interface |
| Input Ranges | Unipolar: 0 V to 5 V and 0 V to 4 V; bipolar: ±5 V and ±3.3 V |
| Power Dissipation | 100 mW maximum |
| Power-Down Mode | Available |
| Factory Calibration | Factory calibrated |
| 封裝 | 20-pin SOIC |
| 安裝方式 | Surface mount |
| Series | AD977 |
| RoHS 狀態 | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
AD977AR 20-pin soic 腳位配置指南
AD977AR（20-pin soic 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： AD977AR.
請參閱 資料表 以查看完整腳位配置。
典型應用
AD977AR 適用於 6 應用s: Industrial Sensor Acquisition, Process Control Monitoring, Data Acquisition Systems, Instrumentation and Measurement, Embedded Control Platforms, Low-Power Control Systems.
Industrial Sensor Acquisition
The AD977AR fits industrial sensor acquisition when the conditioned signal lies within the verified 0 V to 5 V, 0 V to 4 V, ±5 V, or ±3.3 V input ranges and the required conversion rate is no higher than 100 kSPS for AD977. Place the ADC behind op-amp filtering or gain conditioning, use a regulated 5 V supply, and decouple the supply pins close to the device. Its 16-bit resolution is useful for digitizing slow or moderate-speed measurements, while the serial interface helps reduce PCB wiring. The main trade-off is that the AD977A family variant offers 200 kSPS, so the exact suffix matters when acquisition timing is tight.
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Process Control Monitoring
Use the AD977AR for process-control monitoring loops where temperature, pressure, or position sensors are converted into digital values for a controller. The 16-bit result and verified 100 kSPS throughput provide sufficient resolution and speed for many supervisory and feedback measurements, while single 5 V operation simplifies control-board power design. Select the input range to match the sensor amplifier output and verify reference stability. Because the supplied material does not specify temperature limits, accuracy, or noise, those parameters must be checked in the manufacturer datasheet before defining the control-loop accuracy budget.
推薦
Data Acquisition Systems
The AD977AR is suitable as the conversion element in a compact data-acquisition system receiving analog measurements from sensors, transducers, or laboratory interfaces. Its single 5 V supply, 16-bit resolution, factory calibration, and serial interface support integration into embedded instrumentation. Select the unipolar or bipolar range carefully, ensure the source impedance is compatible with the switched-capacitor input, and provide stable reference and bypass components. At 100 kSPS, the device is appropriate for many measurement channels sampled in a controlled sequence; applications requiring substantially higher waveform bandwidth should evaluate a different ADC class.
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Instrumentation and Measurement
The AD977AR can serve precision instrumentation front ends when the analog signal is conditioned into one of the supported input ranges and the board can provide a clean 5 V rail. The 16-bit conversion resolution supports detailed numerical representation, while the internal 2.5 V reference and external-reference options provide design flexibility. Layout should keep analog input routing short, place filtering close to the ADC, and isolate digital serial-clock return currents from sensitive analog nodes. Verify calibration accuracy and temperature behavior in the complete Analog Devices datasheet before assigning metrology-grade claims.
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Embedded Control Platforms
For an embedded controller that periodically reads analog inputs, the AD977AR provides a compact 16-bit conversion function without requiring a parallel ADC bus. Its 20-pin SOIC package and serial interface are practical for boards that value routing simplicity and modest conversion latency. The host must generate the required serial clock and decode the converter output, so firmware timing should be tied to the verified 100 kSPS AD977 throughput. Do not use the 200 kSPS AD977A figure when timing the AD977AR; that distinction is explicitly identified in the family documentation.
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Low-Power Control Systems
The AD977AR's stated low-power operation and available power-down mode make it relevant to compact control systems that do not require continuous conversion. Power-down can reduce activity between measurement intervals, but system-level savings depend on the control sequence, reference state, and analog front end. Use a stable 5 V supply and avoid switching-node coupling into the analog input. Because the verified material gives a maximum power dissipation of 100 mW but does not provide detailed mode-current curves, calculate the complete board budget from the manufacturer datasheet and measured operating states.
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工程參考資料，適用於 AD977AR — 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 | AD977ARZ | AD977AR-REEL | AD977ABRZ |
|---|---|---|---|---|
| Resolution | 16 bit | 16 bit family variant; verify exact suffix | 16 bit family variant; verify exact suffix | 16 bit AD977A family variant |
| ADC Architecture | Successive-approximation switched-capacitor | AD977 family; verify exact architecture | AD977 family; verify exact architecture | AD977A family; verify exact architecture |
| Supply Voltage | 5 V single supply | 5 V family operation; verify exact suffix | 5 V family operation; verify exact suffix | 5 V family operation; verify exact suffix |
| Data Interface | High-speed serial interface | Serial family interface; verify | Serial family interface; verify | Serial family interface; verify |
| Package | 20-pin SOIC | 20-pin SOIC | 20-pin SOIC | 20-pin SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
主要差異化特點
- The AD977 version is specified at 100 kSPS rather than the AD977A family's 200 kSPS (對比AD977ABRZ)
- 16-bit resolution in a 20-pin SOIC package (對比AD977AR-REEL)
- Single 5 V supply with internal 2.5 V reference (對比AD977ARZ)
設計說明
Design the AD977AR around the verified single 5 V supply and place local bypass capacitors close to the supply and reference pins. The verified family material specifies 100 mW maximum power dissipation, but that figure is not a substitute for a complete thermal estimate. Estimated: power dissipation equals the device supply current multiplied by 5 V, so use the operating current from the manufacturer datasheet and add the front-end and reference loads before sizing the regulator.
Route the analog input with short traces, keep the input filter close to the ADC, and keep serial clock and data return paths away from sensitive input and reference nodes. The switched-capacitor SAR architecture can draw transient charge during acquisition; inadequate return-path design can couple digital activity into the measured signal. Follow the Analog Devices datasheet pinout and recommended decoupling layout because individual pin functions are not available in the supplied verified snippets.
Do not confuse the AD977 100 kSPS rate with the AD977A 200 kSPS rate. Select the input range and reference configuration together, and do not assume that every family variant is electrically identical. Before a drop-in substitution, compare the manufacturer pinout, supply limits, serial timing, input range, reference behavior, and package drawing. The listed alternatives are family-related candidates, not independently guaranteed replacements.
Treat the analog source impedance and acquisition settling time as part of the signal path. A sensor or amplifier output that is too slow for the switched-capacitor input can produce conversion-dependent errors, even when the nominal sample rate is acceptable. Estimate the maximum source impedance and RC settling error using the manufacturer input model and acquisition time, then validate with a known ramp or step before production.
Keep switching regulators, clock sources, and digital control lines spatially separated from the analog input and reference network. If the ADC shares a board with a switching supply, route sensitive traces over quiet ground, use controlled return-current paths, and place filtering at the connector or sensor interface. The supplied data does not specify reference-noise or PSRR values, so board-level EMC performance must be measured or checked in the full datasheet.
合規資訊
The supplied verified web data does not explicitly provide AD977AR RoHS, REACH, lead-free, halogen-free, conflict-minerals, or other environmental declarations. AEC-Q100 is marked not_applicable because no automotive qualification claim appears in the supplied material.