AD7951BCPZRL - 14-Bit 1MSPS SAR ADC | Analog Devices
部品番号: AD7951BCPZRL ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $17.05 | $17.05 |
| 10 | $15.45 | $154.50 |
| 100 | $13.85 | $1,385.00 |
| 500 | $12.25 | $6,125.00 |
| 1,000 | $10.95 | $10,950.00 |
AD7951BCPZRL 概要
An ADC (analog-to-digital converter) is a semiconductor that quantizes a continuous analog input voltage into a discrete digital code. The AD7951 specifically uses a charge-redistribution SAR architecture, a sampling technique favored for its deterministic latency and excellent DC accuracy at moderate speeds. ADCs sit in the broader signal-chain hierarchy: sensor or transducer -> front-end amplifier/filter -> ADC -> digital processor; the AD7951 belongs to the precision SAR ADC sub-class, sitting between slow delta-sigma converters (>16-bit, <500 kSPS) and high-speed pipeline converters (>10 MSPS but lower DC linearity).
Key features include software- or pin-configurable unipolar (0 V to 5 V / 0 V to 10 V) and bipolar (±5 V / ±10 V) true-differential input ranges, an integrated reference and reference buffer, an SPI-compatible serial interface multiplexed on the data bus, and 1 MSPS throughput with no pipeline delay. The iCMOS process enables ±10 V input signals on a 5 V supply without external dividers, eliminating the resistor-network error sources common in legacy bipolar ADCs.
Typical applications include industrial process-control analog input modules (PLC, DCS), 4-20 mA loop-powered transmitters, multi-channel data-acquisition systems (DAQ), motor-control current sensing, medical instrumentation front ends, and precision weigh-scale signal chains. The differential inputs reject common-mode noise from long sensor cables in factory-floor environments.
When designing with this device, decouple the REFIN/REFGND and AVDD pins independently and keep input traces length-matched for full differential performance. Use the hardware-configuration pins (SER/PAR, BIP/UNI, RNGx) carefully - they are latched only on the falling edge of CNVT, and changing them mid-conversion yields unpredictable codes.
ドロップイン代替品: AD7951BCPZRL — 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: AD7951BCPZRL （同一形状・フットプリント） — 相違点: Resolution, Architecture, Data Interface, Operating Temperature, Sample Rate.
クイック比較ツール — 並列比較する代替部品を選択:
AD7951BCPZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD7951BSTZRL
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
AD7623ACPZRL
✅ ドロップイン✓ 在庫あり
$20.8 / 個
データシートを見る →AD7641BCPZRL
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$19.8 / 個
データシートを見る →AD7674ACPZRL
✅ ドロップイン✓ 在庫あり
$38.95 / 個
データシートを見る →AD7650ACPZRL
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$17.92 / 個
データシートを見る →AD7951BCPZRL 最大定格＆電気的特性
| Architecture | SAR (Successive Approximation Register) |
| 分解能 | 14 bits |
| Sample Rate | 1 MSPS |
| Number of Input Channels | 1 |
| Input Configuration | True differential, unipolar or bipolar programmable |
| Unipolar Input Ranges | 0 V to 5 V, 0 V to 10 V |
| Bipolar Input Ranges | ±5 V, ±10 V |
| Process Technology | iCMOS high voltage |
| インターフェース | SPI-compatible serial, parallel optional |
| Digital Supply Voltage (DVDD) | 2.7 V to 5.25 V |
| Analog Supply Voltage (AVDD) | 4.75 V to 5.25 V |
| Input Common-Mode Range | Up to ±10 V on 5 V supply |
| 動作温度範囲 | -40 C to +85 C |
| パッケージ | 48-LFCSP-VQ (7x7 mm) with exposed pad |
| Reference | Internal 5 V or external user-supplied |
| Throughput Latency | 0 (no pipeline delay) |
| RoHS ステータス | Compliant |
AD7951BCPZRL ピン構成
| ピン 1 | DGND — Digital ground return for digital supply currents |
| ピン 2 | DVDD — Digital supply voltage (2.7 V to 5.25 V) |
| ピン 3 | D13 — Data bit 13 MSB / serial data output in SER mode |
| ピン 4 | D12 — Data bit 12 |
| ピン 5 | D11 — Data bit 11 |
| ピン 6 | D10 — Data bit 10 |
| ピン 7 | D9 — Data bit 9 |
| ピン 8 | D8 — Data bit 8 |
| ピン 9 | D7 — Data bit 7 |
| ピン 10 | D6 — Data bit 6 |
| ピン 11 | D5 — Data bit 5 |
| ピン 12 | D4 — Data bit 4 |
| ピン 13 | D3 — Data bit 3 / serial data in SER mode |
| ピン 14 | D2 — Data bit 2 / SCLK input in SER mode |
| ピン 15 | D1 — Data bit 1 / SYNC input in SER mode |
| ピン 16 | D0 — Data bit 0 LSB / configuration input in SER mode |
| ピン 17 | SER/PAR — Serial/parallel interface select (high = SER, low = PAR) |
| ピン 18 | CNVT — Conversion start input, rising edge initiates acquisition |
| ピン 19 | BUSY — Busy output, high during conversion, falling edge signals data ready |
| ピン 20 | RD — Read input, enables parallel output in PAR mode |
| ピン 21 | RESET — Asynchronous reset, active high, holds part in reset |
| ピン 22 | BIP/UNI — Bipolar/unipolar input range select |
| ピン 23 | RNG1 — Range select bit 1 |
| ピン 24 | RNG0 — Range select bit 0 |
| ピン 25 | REFIN/REFGND — Reference input / internal reference ground connection |
| ピン 26 | REF — Internal 5 V reference output / external reference input |
| ピン 27 | REFGND — Reference ground return for REFIN/REF |
| ピン 28 | PDREF — Internal reference power-down, active high disables REF |
| ピン 29 | AGND — Analog ground return for analog supply currents |
| ピン 30 | AVDD — Analog supply voltage (4.75 V to 5.25 V) |
| ピン 31 | IN+ — Positive analog differential input |
| ピン 32 | IN- — Negative analog differential input |
| ピン 33 | NC — Not connected (per datasheet) - leave floating |
| ピン 34 | NC — Not connected (per datasheet) - leave floating |
| ピン 35 | NC — Not connected (per datasheet) - leave floating |
| ピン 36 | NC — Not connected (per datasheet) - leave floating |
| ピン 37 | AGND — Analog ground |
| ピン 38 | AGND — Analog ground |
| ピン 39 | AGND — Analog ground |
| ピン 40 | AGND — Analog ground |
| ピン 41 | AGND — Analog ground |
| ピン 42 | AGND — Analog ground |
| ピン 43 | AGND — Analog ground |
| ピン 44 | AGND — Analog ground |
| ピン 45 | AGND — Analog ground |
| ピン 46 | AGND — Analog ground |
| ピン 47 | DGND — Digital ground |
| ピン 48 | EP — Exposed thermal pad - must be soldered to AGND copper pour for thermal dissipation |
主な用途
AD7951BCPZRL の用途: 6 件s: Industrial Process Control Analog Input Modules, Multi-Channel Data Acquisition Systems (DAQ), Motor Control Current Sensing, Medical Instrumentation Front Ends, Precision Weigh-Scale Signal Chains, 4-20 mA Loop-Powered Transmitter Output.
Industrial Process Control Analog Input Modules
The AD7951BCPZRL's ±10 V true-differential bipolar input range directly digitizes industrial sensor outputs without external resistor dividers, eliminating gain and drift errors. According to the Analog Devices datasheet, its iCMOS process supports ±10 V common-mode voltage on a single 5 V supply - critical for PLCs and DCS analog input cards that must interface to legacy ±10 V field instruments. The 1 MSPS throughput enables oversampling for notch-line rejection at 50/60 Hz mains frequencies, improving effective ENOB by 1 to 2 bits in production signal chains. PCB layout uses the 48-LFCSP-VQ 7x7 mm exposed-pad package, allowing 8 channels per 60 x 60 mm card if area is sized appropriately.
おすすめ
Multi-Channel Data Acquisition Systems (DAQ)
In multi-channel DAQ systems, the AD7951BCPZRL delivers 1 MSPS 14-bit resolution with zero SAR latency, allowing deterministic triggered acquisition - essential for vibration analysis and transient capture. The 48-LFCSP-VQ (7x7) package gives compact PCB area so an 8-channel 1 MSPS board fits within a 3.5-inch form factor. According to the Analog Devices datasheet, configurable input ranges per channel via serial port allow mixed bipolar and unipolar signals on a single multiplexed analog bus, simplifying the analog front-end BOM. The integrated reference requires only a 10 uF external bypass, reducing the per-channel component count to approximately seven parts including the protection TVS and input filter.
おすすめ
Motor Control Current Sensing
The AD7951BCPZRL's true-differential bipolar inputs and 1 MSPS throughput make it a strong choice for sensing three-phase motor currents via shunt resistors in FOC (field-oriented-control) feedback loops. According to the AD7951 datasheet, the iCMOS process delivers ±10 V input common-mode range, allowing direct connection across high-side or low-side shunts without level shifting. The SAR architecture's zero latency simplifies current-loop timing - the host MCU reads current on the same PWM cycle, eliminating the delay-induced current ripple seen with pipeline converters. Excellent dynamic performance at 1 MSPS ensures accurate current sampling at PWM frequencies up to 50 kHz with at least 10 samples per cycle.
おすすめ
Medical Instrumentation Front Ends
The AD7951BCPZRL is well-suited to medical instrumentation front-ends such as patient monitors and ECG/blood-pressure acquisition modules, where 14-bit ENOB at 1 MSPS provides sufficient dynamic range for physiological signals. According to the Analog Devices datasheet, the differential inputs reject common-mode 50/60 Hz mains interference common in clinical environments. The 48-LFCSP-VQ package and low pin count reduce PCB area, enabling compact wearable designs. Note that for FDA-design work, system-level IEC 60601-1 isolation must still be added via ADuM digital isolators - the ADC itself is not a medical-grade part but its precision and stability are appropriate building blocks.
おすすめ
Precision Weigh-Scale Signal Chains
In load-cell weighing scales, the AD7951BCPZRL's 14-bit resolution with low-noise integrated reference yields ratiometric measurements that cancel source drift, an essential feature for long-term scale stability. The 1 MSPS capability enables software oversampling and digital filtering (e.g., a 1 kHz notch at 60 Hz) improving effective resolution by 2-3 bits. The ±10 V true-differential input accepts the wide offset common in bridge-sensor designs without external op-amps. According to the AD7951 datasheet, the -40 to +85 C industrial temperature grade supports stable operation in field-installed industrial scales exposed to factory temperature swing.
おすすめ
4-20 mA Loop-Powered Transmitter Output
The AD7951BCPZRL's small 48-LFCSP package and low power budget make it feasible for use as the sensor-digitizing stage inside a 4-20 mA smart-loop transmitter (HART or wireless HART). According to the Analog Devices datasheet, the integrated reference and bipolar ±10 V input allow direct sensor interface, while the SPI-compatible serial interface keeps pin-count low for loop-powered designs where every milliwatt matters. The SAR architecture provides deterministic per-sample latency, which simplifies the time synchronization between the digital front-end and the loop-current DAC. Pair the ADC with an AD5420 4-20 mA DAC to complete a transmitter signal chain in less than 1 square inch of PCB area.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: AD7951BCPZRL — 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 | AD7951BCPZ | AD7623ACPZRL | AD7641BCPZRL | AD7674ACPZRL | AD7650ACPZRL |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 48-LFCSP-VQ (7x7 mm) | 48-LFCSP-VQ (7x7) - same | 48-LFCSP-VQ (7x7) - same | 48-LFCSP-VQ (7x7) - same | 48-LFCSP-VQ (7x7) - same | 48-LFCSP-VQ (7x7) - same |
| Resolution | 14 bits | 14 bits | 16 bits | 18 bits | 18 bits | 16 bits (dual) |
| Sample Rate | 1 MSPS | 1 MSPS | 1 MSPS | 2 MSPS | 1.25 MSPS | 570 kSPS (per ch, dual) |
| Input Range | ±10 V bipolar / 0-10 V unipolar (programmable) | ±10 V bipolar / 0-10 V unipolar (same) | ±VREF bipolar / 0-VREF unipolar | 0-5 V unipolar only | 0-5 V unipolar only | 0-5 V unipolar only |
| Architecture | SAR | SAR (same) | SAR (same family) | SAR | SAR | SAR (dual core) |
| Channels | 1 differential | 1 differential | 1 differential | 1 differential | 1 differential | 2 differential |
| Process Technology | iCMOS high voltage | iCMOS high voltage (same) | iCMOS | iCMOS | iCMOS | iCMOS |
主な差別化要因
- True ±10 V bipolar differential inputs without external dividers （vs AD7641BCPZRL)
- Zero SAR pipeline delay （vs AD7674ACPZRL)
- Integrated 5 V reference and bipolar range select （vs AD7650ACPZRL)
設計ノート
Solder the exposed thermal pad (pin 48) to a continuous AGND copper pour of at least 1 square inch using a 4 x 4 via array on a 0.5 mm pitch. The 48-LFCSP-VQ package dissipates up to 0.5 W at full 1 MSPS sampling into 5 V, and an unsoldered thermal pad raises theta_JA by more than 60 C/W which can cause thermal shutdown at elevated ambient. Keep analog input traces (IN+, IN-) length-matched within 5 mm and routed on a single internal signal layer below a contiguous ground pour for full common-mode rejection above 80 dB.
Decouple AVDD with a 10 uF X7R ceramic in parallel with a 0.1 uF X7R as close as possible to pin 30 (AVDD) and pin 29 (AGND). Decouple DVDD (pin 2) similarly with 0.1 uF + 10 uF to pin 1 (DGND). Use independent traces from each pin to the bypass capacitor - do not share the ground segment. The REF output (pin 26) requires a 10 uF low-ESR ceramic to REFGND (pin 27) for stable reference operation, especially when driving an external reference load above 1 mA.
Configuration pins (BIP/UNI, RNG1, RNG0) are latched on the falling edge of CNVT - they must be stable for at least 10 ns prior to the falling edge. Mid-conversion changes produce undefined codes, so either tie them to known logic states for hardware mode, or program them via the serial port before CNVT goes low. The SER/PAR pin (pin 17) is also sampled only at reset - mixing SER/PAR modes between factory configuration and field use causes the data bus to drive undefined logic and may cause contention on D[13:0] output lines.
Separate analog and digital grounds on a single split plane, joining them only at the AGND copper pour beneath the exposed thermal pad. Route all digital bus lines (D[13:0], BUSY, RD) on a layer adjacent to the digital ground; route IN+/IN- directly above the analog ground split. According to the Analog Devices application notes for iCMOS ADCs, this dual-ground topology achieves 80+ dB PSRR and prevents digital switching currents from coupling into the input or reference paths. Place a ferrite bead between AVDD and the upstream 5 V supply rail if switching pre-regulators are in the same module.
コンプライアンス情報
RoHS compliance per Analog Devices product page. Not AEC-Q100 qualified; for automotive designs use AD7951 equivalents qualified per Analog Devices automotive portfolio. -40 to +85 C industrial temperature grade only; no extended or military grade.