AD7710AR-REEL - 24-Bit Sigma-Delta ADC w/ PGA | Analog Devices
부품 번호: AD7710AR-REEL ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.8 | $168.00 |
| 100 | $14.9 | $1,490.00 |
| 500 | $13.45 | $6,725.00 |
| 1,000 | $12.1 | $12,100.00 |
| 2,500 | $11.2 | $28,000.00 |
AD7710AR-REEL 개요
A sigma-delta ADC is an oversampling converter that uses a modulator and digital filter to achieve very high effective resolution at low bandwidth. It belongs to the precision data-converter family, sitting between successive-approximation ADCs (faster, lower resolution) and integrating ADCs (slower, very high noise rejection). Within Analog Devices' portfolio, sigma-delta converters target low-frequency measurement applications such as weigh scales, industrial process controls, and sensor signal conditioning.
Key features include 24 bits with no missing codes, ±0.0015% maximum nonlinearity, differential inputs, programmable gains from 1 to 128, an integrated low-pass digital filter, and a programmable current source for transducer excitation. The bidirectional serial interface allows input-channel selection, gain, polarity, and calibration mode to be configured in software; self-calibration, system calibration, and background calibration modes are supported through on-chip calibration registers.
Architecturally, the AD7710 combines an input switching network, a chopper-stabilized PGA, a sigma-delta modulator, and a digital filter on a single CMOS die. The chopper-stabilized front end minimizes drift and 1/f noise, while the digital filter simultaneously provides 50 Hz / 60 Hz power-line rejection, eliminating the need for external filtering on industrial mains frequencies.
Typical applications include weigh scales, load-cell/strain-gage signal conditioning, RTD and thermocouple temperature measurement, pressure transducers, flow meters, and 4-20 mA loop-powered industrial sensor transmitters. The on-chip current source and PGA let designers eliminate external instrumentation amplifiers and excitation circuits.
When designing with the AD7710, pay attention to analog and digital ground separation, decouple AVDD with a 10 µF tantalum plus 0.1 µF ceramic close to the pin, and reserve sufficient digital-filter settling time after channel or gain changes to avoid erroneous readings.
This page synthesizes distributor pricing, drop-in alternative candidates, and practical design notes that complement the Analog Devices datasheet revision G.
드롭인 대체품: AD7710AR-REEL — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD7710ARZ-REEL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7710AR-REEL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7710AR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7710ARZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7711AR-REEL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7714AR-5
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7710AR-REEL 최대 정격 & 전기적 특성
| Part Number | AD7710AR-REEL |
| Manufacturer | Analog Devices, Inc. |
| 분해능 | 24 bits, no missing codes |
| Architecture | Sigma-Delta (charge-balancing ADC) |
| Number of Input Channels | 2 differential |
| Output Throughput Rate | 1.028 kSPS (typ) |
| Integral Nonlinearity (INL) | ±0.0015% (typ) |
| Programmable Gain Range | 1 to 128 |
| Input Range | Differential, bipolar or unipolar |
| On-Chip Current Source | Yes (for transducer excitation) |
| 인터페이스 | Bidirectional serial |
| 패키지 | 24-SOIC (Wide, 0.295 in / 7.50 mm) |
| Packaging | Tape & Reel (REEL) |
| Digital Filter Type | On-chip low-pass (sinc) |
| Calibration Modes | Self-cal, system-cal, background-cal |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant (REEL suffix) |
AD7710AR-REEL 핀 구성
| 핀 1 | REF IN(-) — Differential reference input (negative) |
| 핀 2 | REF IN(+) — Differential reference input (positive) |
| 핀 3 | AGND — Analog ground |
| 핀 4 | AVDD — Analog positive supply |
| 핀 5 | IEXC — Programmable current source output for transducer excitation |
| 핀 6 | AIN1(+) — Analog input 1 positive (differential) |
| 핀 7 | AIN1(-) — Analog input 1 negative (differential) |
| 핀 8 | AIN2(+) — Analog input 2 positive (differential) |
| 핀 9 | AIN2(-) — Analog input 2 negative (differential) |
| 핀 10 | AVDD — Analog positive supply (second pin) |
| 핀 11 | AVSS / AGND2 — Analog negative supply or ground (depends on supply configuration) |
| 핀 12 | NC — Not connected (per datasheet) |
| 핀 13 | NC — Not connected (per datasheet) |
| 핀 14 | NC — Not connected (per datasheet) |
| 핀 15 | DGND — Digital ground |
| 핀 16 | DVDD — Digital supply (logic interface) |
| 핀 17 | MODE — External crystal or oscillator input |
| 핀 18 | XIN — Crystal oscillator input / clock |
| 핀 19 | XOUT — Crystal oscillator output |
| 핀 20 | CS — Chip select for serial interface |
| 핀 21 | SCLK — Serial clock input |
| 핀 22 | DRDY — Data ready output (open drain) |
| 핀 23 | DOUT/DIN — Serial data input/output (bidirectional) |
| 핀 24 | RESET — Reset input (active low) |
일반적인 애플리케이션
AD7710AR-REEL 적합 용도: 7 애플리케이션s: Weigh Scales and Load Cells, RTD Temperature Measurement, Pressure Transducers and Bridge Sensors, Industrial Process Control (4-20 mA Loops), Flow Meters and Low-Frequency Instrumentation, Battery-Powered Sensor Modules, Data Acquisition Front Ends.
Weigh Scales and Load Cells
The AD7710AR-REEL's 24-bit no-missing-codes resolution and on-chip 128x PGA directly digitize strain-gage bridge outputs in the tens-of-millivolts range without an external instrumentation amplifier. The integrated programmable current source powers load-cell bridges and the onboard self-calibration removes offset/gain drift over the industrial -40C to +85C range. Its bipolar ±20 mV (gain 128) range maps cleanly onto 1-3 mV/V load-cell sensitivities.
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RTD Temperature Measurement
In 4-wire RTD instrumentation, the AD7710AR-REEL drives a precision excitation current through the RTD and digitizes the resulting millivolt drop with 24-bit resolution. The integrated PGA selects the correct gain for Pt100/Pt1000 RTDs while the digital filter simultaneously rejects 50/60 Hz mains interference from the PLC or PSU. Calibration registers compensate for lead-resistance errors inherent to industrial RTD wiring.
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Pressure Transducers and Bridge Sensors
Differential pressure sensors up to 1-5 kPa full-scale output 1-100 mV at the AD7710AR-REEL's differential input, where the 128x PGA amplifies the signal to within the ADC's full-scale range. The on-chip digital filter delivers simultaneous 50/60 Hz rejection while background-calibration mode continuously trims offset drift without interrupting measurement - critical in process-control loops where downtime is unacceptable.
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Industrial Process Control (4-20 mA Loops)
The AD7710AR-REEL powers the analog front end of a 4-20 mA loop transmitter where 24-bit resolution at the ADC preserves the dynamic range of the field sensor. Its bipolar input accepts directly-coupled transducer signals and the bidirectional serial port interfaces to an isolated microcontroller over a single opto-coupled data line, simplifying IEC-61000-4 compliant loop-powered designs.
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Flow Meters and Low-Frequency Instrumentation
For Coriolis, ultrasonic, or turbine flow meters, the AD7710AR-REEL samples low-frequency sensor signals at 1.028 kSPS while its digital filter rejects high-frequency switching noise from the upstream solenoid drivers. The 0.0015% INL ensures flow-rate calculations over time remain accurate without recalibration, and the bidirectional serial port lets the metering MCU calibrate flow constants on the fly.
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Battery-Powered Sensor Modules
Where the AD7710AR-REEL's sigma-delta architecture inherently draws low quiescent current between conversions, it is well-suited for battery-powered sensor modules transmitting via wireless M-Bus or LoRa. Its bipolar/unipolar input range handles varying sensor types without re-design, and its on-chip programmable current source removes the need for a separate boost converter to drive the sensor.
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Data Acquisition Front Ends
Embedded SCADA and PLC systems use the AD7710AR-REEL as the analog front end for low-frequency analog inputs over USB or RS-485 backbones. The bidirectional serial port enables daisy-chain configuration of multiple AD7710s sharing a single isolated SPI bus, and the 2-channel differential input maps directly onto redundant sensor pairs for safety-critical instrumentation.
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추천 제품 요약
엔지니어링 참조 데이터: AD7710AR-REEL — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AD7710ARZ-REEL7 | AD7710AR-REEL7 | AD7710AR | AD7710ARZ | AD7711AR-REEL7 | AD7714AR-5 |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 24-SOIC (Wide, 7.50 mm) | 24-SOIC (Wide, 7.50 mm) | 24-SOIC (Wide, 7.50 mm) | 24-SOIC (Wide, 7.50 mm) | 24-SOIC (Wide, 7.50 mm) | 24-SOIC (Wide, 7.50 mm) | 24-SOIC (Wide, 7.50 mm) |
| Resolution | 24 bits, no missing codes | 24 bits | 24 bits | 24 bits | 24 bits | 16 bits (-33%) | 24 bits |
| Input Channels | 2 differential | 2 differential | 2 differential | 2 differential | 2 differential | 2 differential | 3 differential (+50%) |
| Programmable Gain | 1 to 128 | 1 to 128 | 1 to 128 | 1 to 128 | 1 to 128 | 1 to 128 | 1 to 128 |
| On-Chip Current Source | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
주요 차별점
- Programmable gain from 1 to 128 with on-chip current source (vs AD7711AR-REEL7)
- Two differential input channels plus bipolar/unipolar input (vs AD7714AR-5)
- Self-calibration, system-calibration, and background-calibration in one part (vs AD7710ARZ-REEL7)
설계 노트
Decouple AVDD and DVDD with a 10 µF tantalum capacitor in parallel with a 0.1 µF ceramic placed within 5 mm of the supply pins. For dual-supply (AVDD=+5V, AVSS=-5V) operation, also bypass AVSS with its own 0.1 µF+10 µF network. Separate analog and digital ground planes are joined at a single point near the ADC AGND pin per the datasheet PCB layout guidance.
The AD7710's serial clock can inject digital noise into the analog front end if trace spacing is too small. Route the CS, SCLK, DOUT/DIN, and DRDY traces over a continuous ground plane and guard with ground stitching vias every 5 mm. Use a short (<25 mm), 5 ns series resistor on SCLK to dampen reflections when driving >50 mm board-to-board harnesses.
Common pitfalls when using the AD7710AR-REEL: (1) applying input voltages exceeding ±25 V (on AVSS=0V config) will damage the inputs - clamp with external protection diodes; (2) omitting a self-calibration after gain change causes incorrect data - always issue a self-cal after PGA writes; (3) failure to allow sufficient settling time after channel switch leads to erroneous first-sample data - allow ≥8 conversion cycles through the digital filter first.
Estimated: junction temperature rise = θJA × dissipation. The AD7710 in SOIC-24 dissipates approximately 30 mW quiescent at 5 V (6 mA). With θJA ≈ 70 C/W (still air, SOIC-24 typical PCB), the temperature rise is ~2.1 C above ambient - thermally inconsequential. In sealed industrial housings at +85 C, ensure PCB layout maximizes thermal dissipation by tying AVDD/AVSS pins to copper pours rather than traces.
For best 50/60 Hz mains noise rejection, ensure the analog input traces are tied together (precision-matched differential pair) with equal trace length on AINx+ and AINx-, and surrounded by ground pours. The reference inputs (REF IN+, REF IN-) are equally noise-sensitive and must be short and decoupled with 0.1 µF at the pin. The IEXC current-source pin produces sourcing noise - keep it away from input traces.
규정 준수 정보
AD7710AR-REEL (AR suffix) is a Pb-bearing non-RoHS variant. For RoHS-compliant designs choose AD7710ARZ variants (e.g. AD7710ARZ-REEL7). Reach and conflict-mineral status to be confirmed against the most recent Analog Devices REACH/SMIIT declaration. AEC-Q100 not qualified - this part is for industrial/commercial use only.
