AD7714ARS-5REEL - 24-Bit Sigma-Delta ADC, 28-SSOP | Analog Devices
部品番号: AD7714ARS-5REEL ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.85 | $1,385.00 |
| 500 | $11.95 | $5,975.00 |
| 1,000 | $10.4 | $10,400.00 |
AD7714ARS-5REEL 概要
A sigma-delta ADC is a converter architecture that oversamples an input signal, shapes quantization noise out of the signal band, and decimates the high-rate bitstream down to a lower output word rate, achieving very high resolution at the cost of input bandwidth. Within the broader data-converter hierarchy, sigma-delta ADCs sit between precision SAR converters (faster, lower-resolution) and integrating dual-slope ADCs (very slow, very high DC accuracy). The AD7714 is specifically positioned as a complete analog front end: programmable-gain front end, on-chip calibration, and digital filtering are integrated so that a transducer can be connected directly with minimal external signal conditioning.
Key specifications include 24-bit resolution with no missing codes, 0.0015% non-linearity, 140 nV rms noise, and a programmable-gain front end supporting gains from 1 to 128 over five input channels. The output data rate is configurable and the part provides self-calibration modes that remove zero-scale and full-scale endpoint errors plus temperature-drift effects. Compared to the original A grade, the Y grade (the -5 suffix) adds Schmitt-trigger inputs on SCLK and DIN, tighter linearity, lower power consumption, and an extended operating temperature range, while being available in a smaller SSOP package.
The AD7714 employs a proprietary charge-balancing conversion technique that allows direct connection to strain gauges, RTDs, thermocouples, and other low-level bridge-type transducers. On-chip registers control filter cutoff, input gain, channel selection, signal polarity, and calibration modes. The three-wire serial interface minimizes interconnect lines, which is particularly valuable in isolated front ends because it reduces the number of optocouplers required between the transducer and the host microcontroller or DSP.
Typical applications include industrial process control weighing scales, strain-gauge and load-cell signal conditioning, portable battery-powered instrumentation, and isolated 4-20 mA loop digitizers. The low 500 µA supply current makes the part attractive for loop-powered or handheld instruments. Use the AD7714 when you need 20-24 bit effective resolution on DC or slowly-varying signals, integrated PGA gains up to 128, and an SPI-compatible digital interface that interfaces directly to microcontrollers and DSPs.
ドロップイン代替品: AD7714ARS-5REEL — 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。
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AD7714ARSZ-5REEL
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AD7714ARSZ-5
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AD7714ARS-5
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AD7714ARZ-5REEL
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AD7714AR-5REEL
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AD7714ARS-5REEL 最大定格＆電気的特性
| 分解能 | 24 bits |
| Number of Input Channels | 3 differential / 5 pseudo-differential |
| Architecture | Sigma-Delta (charge balancing) |
| 電源電圧 | 4.75 V to 5.25 V (single 5 V supply) |
| 電源電流 | 500 uA typical |
| Nonlinearity | 0.0015% |
| No Missing Codes | 24 bits guaranteed |
| Input RMS Noise | 140 nV |
| Programmable Gain | 1 to 128 |
| Digital Interface | DSP, MICROWIRE, QSPI, Serial, SPI compatible (3-wire) |
| Input Type | Differential / Pseudo-Differential |
| パッケージ / ケース | 28-SSOP (0.209 inch / 5.30 mm width) |
| 実装タイプ | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Calibration | On-chip self-calibration (zero-scale, full-scale) |
| Schmitt Trigger on SCLK/DIN | Yes (Y grade / -5 suffix) |
AD7714ARS-5REEL ピン構成
| ピン 1 | SCLK — Serial clock input (Schmitt-trigger, -5 grade) |
| ピン 2 | DIN — Serial data input (Schmitt-trigger, -5 grade) |
| ピン 3 | DOUT — Serial data output |
| ピン 4 | DRDY — Data ready output (active low) |
| ピン 5 | CS — Chip select input (active low) |
| ピン 6 | SYNC — Synchronization input |
| ピン 7 | RESET — Reset input (active low) |
| ピン 8 | MODE — Mode select input (clock/filter control) |
| ピン 9 | DGND — Digital ground |
| ピン 10 | DVDD — Digital +5 V supply |
| ピン 11 | STANDBY — Standby input (active low) |
| ピン 12 | REFIN+ — Differential reference input, positive |
| ピン 13 | REFIN- — Differential reference input, negative |
| ピン 14 | AGND — Analog ground |
| ピン 15 | AVDD — Analog +5 V supply |
| ピン 16 | AIN1(+) — Analog input 1, positive |
| ピン 17 | AIN1(-) — Analog input 1, negative |
| ピン 18 | AIN2(+) — Analog input 2, positive |
| ピン 19 | AIN2(-) — Analog input 2, negative |
| ピン 20 | AIN3(+) — Analog input 3, positive |
| ピン 21 | AIN3(-) — Analog input 3, negative |
| ピン 22 | AIN4 — Analog input 4 (pseudo-differential) |
| ピン 23 | AIN5 — Analog input 5 (pseudo-differential) |
| ピン 24 | AINCOM — Analog input common (pseudo-differential return) |
| ピン 25 | NC — Not connected (per datasheet) |
| ピン 26 | NC — Not connected (per datasheet) |
| ピン 27 | NC — Not connected (per datasheet) |
| ピン 28 | NC — Not connected (per datasheet) |
主な用途
AD7714ARS-5REEL の用途: 6 件s: Industrial Weigh Scales (Load Cell Signal Conditioning), Strain-Gauge and Pressure-Sensor Front End, Thermocouple and RTD Temperature Measurement, Portable Battery-Powered Instrumentation, Isolated 4-20 mA Loop Digitizers, Smart Sensor / IoT Edge Modules.
Industrial Weigh Scales (Load Cell Signal Conditioning)
The AD7714ARS-5REEL is well matched to industrial weigh-scale front ends because it integrates a programmable-gain front end with gains from 1 to 128 directly amplifying the low-level bridge output of a load cell, eliminating an external instrumentation amp. Its 24-bit sigma-delta architecture delivers 0.0015% non-linearity and 140 nV rms noise, ensuring stable, calibrated weight readings across a wide dynamic range. Place the load cell between AIN1(+) and AIN1(-) with PGA gain set high enough that full-scale weight corresponds to within the input common-mode range of the part. On-chip self-calibration removes offset and gain errors, which is critical for absolute weight accuracy over the industrial temperature range.
おすすめ
Strain-Gauge and Pressure-Sensor Front End
The AD7714ARS-5REEL directly digitizes strain-gauge bridges and piezoresistive pressure sensors without external signal conditioning thanks to its low input-referred noise of 140 nV rms and built-in programmable gain from 1 to 128. The 24-bit no-missing-codes performance preserves fine resolution of small strain variations, while the on-chip self-calibration eliminates zero-scale and full-scale drift over temperature. Drive the bridge excitation from a stable 5 V rail and connect the differential bridge output to one of the three differential AIN pairs. The three-wire SPI interface simplifies connection to a host MCU that performs weight or pressure calculations and display updates.
おすすめ
Thermocouple and RTD Temperature Measurement
The AD7714ARS-5REEL handles thermocouple and RTD temperature measurement because its 140 nV rms noise floor and high-resolution sigma-delta conversion resolve microvolt-level thermocouple signals at sub-degree-C accuracy when used with cold-junction compensation. Configure the part in pseudo-differential mode with the thermocouple on one AIN channel and the CJC sensor on another, then use the high PGA gains to amplify the low-amplitude thermocouple EMF. The built-in digital filter rejects 50/60 Hz line interference, which is essential for accurate industrial temperature readings. Internal calibration modes further reduce drift across the industrial temperature range.
おすすめ
Portable Battery-Powered Instrumentation
The AD7714ARS-5REEL is well suited to portable, battery-powered instrumentation because of its low 500 uA typical supply current and single 5 V supply operation, which simplifies power-tree design in handheld meters and field instruments. The integrated PGA removes the need for a separate low-noise instrumentation amp, shrinking the BOM for compact portable products. The Schmitt-trigger SCLK/DIN inputs on the -5 Y-grade variant provide robust noise immunity in electrically noisy industrial or field environments. The SPI-compatible interface connects directly to low-power microcontrollers such as the ADuC702x family for a complete battery-powered measurement platform.
おすすめ
Isolated 4-20 mA Loop Digitizers
The AD7714ARS-5REEL is a good fit for isolated 4-20 mA current-loop digitizers because its three-wire SPI interface requires only three optoisolators for full galvanic isolation between the field side and the host controller. The 24-bit resolution preserves the full dynamic range of the 4-20 mA signal, while the integrated PGA removes the need for external current-sense amplifiers. Place a low-value sense resistor in series with the loop and digitize the differential voltage with the AD7714's PGA set for maximum dynamic range. The on-chip calibration eliminates errors introduced by sense-resistor tolerance and temperature drift.
おすすめ
Smart Sensor / IoT Edge Modules
The AD7714ARS-5REEL is well matched to smart sensor and IoT edge modules that need high-accuracy ADC performance in a small, low-power package for direct digitization of analog sensor outputs. The 28-SSOP footprint allows placement in compact sensor modules that connect to a host processor over SPI or to a wireless MCU via a digital-isolator or level shifter. The 24-bit resolution, integrated PGA, and on-chip calibration simplify the analog front end to a few passive components plus the sensor itself. Combined with a wireless MCU such as the ADuCM3027, it enables battery-powered wireless sensor nodes for industrial monitoring.
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: AD7714ARS-5REEL — 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 | AD7714ARSZ-5REEL | AD7714ARSZ-5 | AD7714ARS-5 | AD7714ARZ-5REEL | AD7714AR-5REEL |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Resolution | 24 bits | 24 bits | 24 bits | 24 bits | 24 bits | 24 bits |
| Y-grade / Schmitt Trigger SCLK-DIN | Yes (-5 suffix) | Yes (Z = RoHS suffix, retains -5 Y-grade) | Yes (Z = RoHS suffix, retains -5 Y-grade) | Yes (-5 suffix) | No (commercial A-grade) | No (commercial A-grade) |
| RoHS Compliance | Non-RoHS (Pb-bearing finish) | RoHS compliant (Z suffix) | RoHS compliant (Z suffix) | Non-RoHS (Pb-bearing finish) | RoHS compliant (Z suffix) | Non-RoHS (Pb-bearing finish) |
| Supply Voltage | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V |
| Packaging Media | Tape & Reel (REEL) | Tape & Reel (REEL) | Tube | Tube | Tape & Reel (REEL) | Tape & Reel (REEL) |
主な差別化要因
- Direct transducer connection with integrated programmable gain （vs External 24-bit ADC + discrete instrumentation amplifier)
- Y-grade Schmitt-trigger serial interface （vs AD7714AR-5REEL (A-grade))
- On-chip self-calibration （vs Discrete sigma-delta ADC + manual calibration firmware)
設計ノート
Power the AD7714ARS-5REEL from a low-noise 5 V rail; bypass AVDD and DVDD with 10 uF tantalum plus 0.1 uF ceramic capacitors placed as close as possible to each supply pin. According to the Analog Devices AD7714 datasheet, the analog and digital supplies should be decoupled separately, with AGND and DGND tied at a single point near the part to avoid digital noise coupling into the analog front end. Estimated: with 5 V supply and 500 uA typical current, the part draws ~2.5 mW - verify against the production datasheet for the final power budget.
Do not connect any analog input above AVDD or below AGND, as the absolute-maximum input voltage on the AIN pins is AVDD + 0.3 V / AGND - 0.3 V per the Analog Devices AD7714 datasheet. Exceeding this range can permanently damage the input ESD structures. For sensors that exceed the supply range (for example, thermocouples with fault voltages), add external clamp diodes or input-protection resistors.
Use a single ground plane divided into analog and digital sections with the AD7714ARS-5REEL at the boundary, and route the analog and digital supply traces separately to their respective pins. Keep the REFIN+ and REFIN- traces short and symmetric to minimize common-mode noise pickup; a clean low-noise external reference such as the AD780 is recommended. Estimated: trace capacitance of a few pF on REFIN can degrade noise performance; keep traces under 10 mm and avoid running them parallel to switching signals.
コンプライアンス情報
The AD7714ARS-5REEL (no Z suffix) uses the legacy Pb-bearing finish and is NOT RoHS compliant. For RoHS-compliant builds use the AD7714ARSZ-5REEL variant. AEC-Q100 is not applicable (industrial / instrumentation part). REACH, halogen-free, and conflict-minerals status were not present in the verified web data and are marked unknown.
