AD977AR - 16-Bit 100 kSPS Serial ADC | Analog Devices
部品番号: AD977AR ✗ 生産終了| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
AD977AR 概要
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.
ドロップイン代替品: AD977AR — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: AD977AR （同一形状・フットプリント） — 相違点: Package, Supply Voltage, Throughput Rate, Mounting Type, Power-Down Mode.
クイック比較ツール — 並列比較する代替部品を選択:
AD977ARZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD977AR-REEL
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD977ABRZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD977AR 最大定格＆電気的特性
| ADC Type | Successive-approximation switched-capacitor ADC |
| 分解能 | 16 bit |
| Input Channels | 1 input |
| Input Type | Single ended |
| Throughput Rate | 100 kSPS for AD977; 200 kSPS for AD977A |
| 電源電圧 | 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 |
| パッケージ | 20-pin SOIC |
| 実装スタイル | Surface mount |
| Series | AD977 |
| RoHS ステータス | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
AD977AR 20-pin soic ピン配置ガイド
AD977AR (20-pin soic パッケージ) のピン配置。 このアナログコンポーネントは、入力、出力、および電源ピンを備えています。オフセットナル、補償、イネーブルピンの設定については、メーカーのデータシートを参照してください。信号調整やアンプ回路に最適です。
詳細なピン配置データはありません: AD977AR.
詳細は データシート をご参照ください。
主な用途
AD977AR の用途: 6 件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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
エンジニアリング参考データ: AD977AR — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | 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 |
主な差別化要因
- The AD977 version is specified at 100 kSPS rather than the AD977A family's 200 kSPS （vs AD977ABRZ)
- 16-bit resolution in a 20-pin SOIC package （vs AD977AR-REEL)
- Single 5 V supply with internal 2.5 V reference （vs AD977ARZ)
設計ノート
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.
コンプライアンス情報
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.
