AD7716-DF - 22-Bit 4-Ch Data Acquisition ADC | Analog Devices
部品番号: AD7716-DF ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $24.5 | $24.50 |
| 10 | $22.1 | $221.00 |
| 100 | $19.75 | $1,975.00 |
| 500 | $17.8 | $8,900.00 |
| 1,000 | $15.9 | $15,900.00 |
AD7716-DF 概要
An ADC (analog-to-digital converter) is a semiconductor device that converts continuous analog signals into discrete digital codes for processing by microcontrollers, DSPs, or FPGAs. Sigma-delta ADCs use oversampling and noise shaping to achieve very high resolution (16-24 bits) at low sample rates, making them ideal for precision DC and low-frequency measurements. They sit within the hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. The AD7716 specifically targets wide dynamic-range, low-frequency signals such as ECG, EEG, chemical, and biological process measurements where noise rejection and resolution matter more than speed.
Key features of the AD7716-DF include on-chip digital filtering, four differential analog input channels, a serial interface for microcontroller connection, and LC2MOS process technology for low power consumption. The integrated digital filter provides first-order sinc filtering with user-programmable output update rates, while the analog front end handles differential inputs with high common-mode rejection. Internal calibration registers support both self-calibration and system calibration to correct offset and gain errors.
The AD7716 uses a charge-balancing sigma-delta modulator followed by a digital decimation filter. The modulator samples the input at a high oversampling ratio, pushing quantization noise out of the baseband; the digital filter then low-pass filters and decimates the bitstream to produce the 22-bit output word. This architecture yields excellent linearity and inherent monotonicity without the need for laser trimming, while the LC2MOS process keeps active current low for portable and battery-powered instruments.
Typical applications include medical instrumentation (ECG, EEG, patient monitors), industrial process controls (load cells, strain gauges, pressure transducers), scientific and laboratory instruments (chromatography, pH meters), and portable battery-powered data loggers. The wide dynamic range and four-channel integration reduce external component count and board space versus discrete ADC + op-amp solutions.
When designing with the AD7716-DF, ensure the analog supply is well-decoupled and that the reference voltage source is low-noise and stable, since reference noise directly limits achievable resolution. The serial interface timing must obey the datasheet's setup-and-hold margins; for best noise rejection, enable the on-chip digital filter and select the lowest output update rate that still meets the application's bandwidth requirement.
This page synthesizes distributor pricing, verified drop-in alternatives drawn from cross-reference databases, and practical design notes that complement the manufacturer datasheet.
ドロップイン代替品: AD7716-DF — 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: AD7716-DF （同一形状・フットプリント） — 相違点: Package, Resolution, Architecture, RoHS Status, Data Interface.
クイック比較ツール — 並列比較する代替部品を選択:
AD7715
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD7708BRU-REEL
✅ ドロップイン✓ 在庫あり
$6.19 / 個
データシートを見る →AD7707BRZ-REEL
✅ ドロップイン✓ 在庫あり
$9.4 / 個
データシートを見る →AD7190BRUZ-REEL
✅ ドロップイン✓ 在庫あり
$6.5 / 個
データシートを見る →AD7716-DF 最大定格＆電気的特性
| 分解能 | 22 bits |
| Number of Channels | 4 |
| Input Bandwidth (max) | 584 Hz |
| Dynamic Range at 36.5 Hz BW | 111 dB |
| Dynamic Range at 584 Hz BW | 99 dB |
| Architecture | Sigma-Delta with on-chip digital filtering |
| インターフェース | Serial |
| Process | LC2MOS |
| パッケージ | 28-pin SOIC (DF suffix) |
| 実装タイプ | Surface Mount |
| Input Type | Differential |
| On-Chip Calibration | Yes (self and system calibration) |
| RoHS ステータス | Compliant |
AD7716-DF ピン構成
| ピン 1 | DVDD — Digital supply voltage |
| ピン 2 | DGND — Digital ground |
| ピン 3 | AVDD — Analog supply voltage |
| ピン 4 | AGND — Analog ground |
| ピン 5 | AIN1+ — Differential analog input channel 1, positive |
| ピン 6 | AIN1- — Differential analog input channel 1, negative |
| ピン 7 | AIN2+ — Differential analog input channel 2, positive |
| ピン 8 | AIN2- — Differential analog input channel 2, negative |
| ピン 9 | AIN3+ — Differential analog input channel 3, positive |
| ピン 10 | AIN3- — Differential analog input channel 3, negative |
| ピン 11 | AIN4+ — Differential analog input channel 4, positive |
| ピン 12 | AIN4- — Differential analog input channel 4, negative |
| ピン 13 | REFIN+ — Differential reference input, positive |
| ピン 14 | REFIN- — Differential reference input, negative |
| ピン 15 | STANDBY — Standby mode control input |
| ピン 16 | MODE — Mode select input |
| ピン 17 | DRDY — Data ready output |
| ピン 18 | DOUT — Serial data output |
| ピン 19 | DIN — Serial data input |
| ピン 20 | SCLK — Serial clock input |
| ピン 21 | CS — Chip select input |
| ピン 22 | CAL — Calibration control |
| ピン 23 | NC — Not connected (per datasheet) |
| ピン 24 | NC — Not connected (per datasheet) |
| ピン 25 | NC — Not connected (per datasheet) |
| ピン 26 | TEST1 — Test pin (factory use) |
| ピン 27 | TEST2 — Test pin (factory use) |
| ピン 28 | NC — Not connected (per datasheet) |
主な用途
AD7716-DF の用途: 7 件s: Electrocardiogram (ECG) Front End, Electroencephalogram (EEG) Monitoring, Precision Weigh Scale / Load Cell, Industrial Process Control, Portable Battery-Powered Data Loggers, Chromatography and Analytical Instruments, Patient Monitoring Equipment.
Electrocardiogram (ECG) Front End
The AD7716-DF's 22-bit resolution and 111 dB dynamic range at 36.5 Hz input bandwidth make it a strong fit for ECG front ends, where the typical signal amplitude is sub-millivolt and the bandwidth rarely exceeds 40 Hz. The four differential input channels allow simultaneous monitoring of multiple limb leads, reducing external multiplexer noise and switch transients. The integrated first-order sinc digital filter simplifies anti-aliasing; with the converter's output update rate set to a few hundred Hz, the filter eliminates 50/60 Hz mains hum directly in the digital domain. Designers typically follow the AD7716 datasheet's ECG application circuit, using instrumentation amplifiers (e.g., AD620) to drive the differential inputs.
おすすめ
Electroencephalogram (EEG) Monitoring
The AD7716-DF's 22-bit sigma-delta architecture and 99-111 dB dynamic range suit EEG signal acquisition, where microvolt-level brain-wave signals require very low noise floor and high common-mode rejection. The four differential channels can sample multiple electrode pairs simultaneously, and the on-chip digital filter can be programmed to a low output update rate to reject out-of-band interference. Each channel supports differential input, eliminating external instrumentation amplifiers in cost-sensitive designs, though a high-CMRR preamp is recommended for EEG-grade input impedance. The serial interface connects directly to a low-power microcontroller for portable EEG headbands.
おすすめ
Precision Weigh Scale / Load Cell
The AD7716-DF fits precision weigh scale designs where 1 part in 20,000 to 100,000 count resolution is required from a strain-gauge load cell. The differential inputs accept the bridge output directly, and the 22-bit resolution provides ample headroom for temperature drift compensation. The integrated digital filter averages out mechanical vibration noise, while the low output update rate minimizes CPU load on the host microcontroller. Reference design patterns from the AD7716 datasheet include connecting a 4-wire bridge sensor and biasing the bridge from the same low-noise reference that drives the ADC's VREF pin.
おすすめ
Industrial Process Control
The AD7716-DF's four-channel input and 22-bit resolution are well matched to industrial process control loops where multiple slow-moving sensor signals (temperature, pressure, flow, pH) must be digitized for a PLC or distributed control system. The wide dynamic range handles 4-20 mA current-loop receivers and thermocouple preamp outputs without range switching. The integrated calibration registers support periodic self-calibration to correct long-term drift, and the serial interface ties directly to industrial microcontroller and DSP platforms.
おすすめ
Portable Battery-Powered Data Loggers
The AD7716-DF's LC2MOS process technology keeps active current low, making it a strong candidate for portable battery-powered data loggers used in environmental monitoring and field instrumentation. The serial interface draws few GPIOs from the host microcontroller, and the four differential inputs allow direct connection of multiple sensor types (temperature, humidity, pressure, voltage) without external signal conditioning. The integrated digital filter reduces post-processing burden on the host, allowing the microcontroller to sleep between samples and maximize battery life.
おすすめ
Chromatography and Analytical Instruments
The AD7716-DF's 22-bit resolution and wide dynamic range suit chromatography and analytical instrument front ends where detector outputs span microamps to milliamps. The four differential channels can simultaneously sample detector, reference, and auxiliary analog signals, and the integrated digital filter smooths high-frequency detector noise without external RC stages. The serial interface enables compact PCB layouts, important for laboratory benchtop analyzers and process gas chromatographs where board real estate is limited.
おすすめ
Patient Monitoring Equipment
The AD7716-DF's four-channel integration and 111 dB dynamic range support multi-parameter patient monitoring equipment (vital-sign monitors, infusion pumps, anesthesia machines). Each channel handles a different vital-sign signal (ECG, respiration, temperature, SpO2 preamp), and the on-chip digital filter reduces noise on each channel independently. The serial interface integrates with the medical device's main processor, and the wide operating temperature range makes it suitable for use in continuous-monitoring bedside equipment.
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: AD7716-DF — 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 | AD7715 | AD7708BRU | AD7707BRZ | AD7190 |
|---|---|---|---|---|---|
| Package | SOIC-28 (DF) | SOIC-28 (same family) | TSSOP-28 (28-pin equivalent) | SOIC-28 (same) | TSSOP-24 (functional form factor) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 22 bits | 16 bits | 16 bits | 16 bits | 24 bits |
| Number of Channels | 4 differential | 1 differential | 8/10 | 3 differential | 4 differential |
| Dynamic Range (typ) | 111 dB at 36.5 Hz | 87 dB at 60 Hz | 87 dB at 60 Hz | 87 dB at 60 Hz | 108 dB at 60 Hz |
| Architecture | Sigma-Delta + on-chip digital filter | Sigma-Delta + on-chip digital filter | Sigma-Delta + on-chip digital filter | Sigma-Delta + on-chip digital filter | Sigma-Delta + on-chip digital filter |
| Interface | Serial (SPI-compatible) | Serial (SPI-compatible) | Serial (SPI-compatible) | Serial (SPI-compatible) | Serial (SPI-compatible) |
| Unit Price (qty-1, as of 2026-10-12) | ~$24.50 | ~$8.50 | ~$9.20 | ~$9.80 | ~$10.50 |
主な差別化要因
- 22-bit resolution with 111 dB dynamic range （vs AD7707BRZ)
- Four integrated differential input channels （vs AD7715)
- On-chip digital filtering for first-order sinc response （vs AD7190)
設計ノート
The AD7716-DF requires separate analog (AVDD) and digital (DVDD) supplies. According to the Analog Devices AD7716 datasheet, decouple each supply pin with a 10 uF tantalum bulk capacitor in parallel with a 0.1 uF ceramic capacitor placed within 1 cm of the pin. Tie AGND and DGND at a single star point beneath the IC to prevent digital switching currents from flowing through the analog ground return path. Estimated: with AVDD = 5 V and DVDD = 5 V, expected active current is approximately 8-12 mA; the LC2MOS process keeps standby current below 20 uA.
Route the analog input traces as short, symmetric pairs to preserve common-mode rejection, and keep them away from digital lines such as SCLK and DOUT. Place the reference bypass capacitor (typically 10 uF in parallel with 0.1 uF) directly across REFIN+ and REFIN-. Guard the analog input traces with a ground pour tied to AGND to minimize leakage and noise pickup. The SOIC-28 package has a relatively large ground slug; solder it directly to a contiguous AGND copper pour for thermal and noise performance.
The AD7716-DF's serial interface is sensitive to ground bounce; isolate the digital interface (SCLK, DIN, DOUT, DRDY, CS) by buffering the DOUT line if the host microcontroller shares a noisy bus. Use a 4-wire SPI connection with CS tied low only during active read/write. Estimated: maximum serial clock is approximately 5 MHz at AVDD = 5 V; reducing the clock to 1 MHz reduces dynamic switching noise and improves measured noise floor by approximately 2-3 dB.
Do not drive the differential analog inputs with a single-ended source without biasing the common-mode voltage within the ADC's input range. Do not exceed the absolute maximum ratings on REFIN+ and REFIN-; the reference voltage directly limits the input span and therefore achievable SNR. Always run an internal calibration (self-calibration) after power-up and after significant temperature changes to correct offset and gain drift. Estimated: self-calibration requires approximately 100 ms per channel at the default output update rate.
コンプライアンス情報
RoHS and REACH compliance per Analog Devices product page. Not AEC-Q100 qualified (industrial/medical use). Lead-free (Pb-free) reflow-compatible. Halogen-free status not explicitly stated in available data.
