AD7707BRZ-REEL - 16-Bit Sigma-Delta ADC | Analog Devices
부품 번호: AD7707BRZ-REEL ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $15.2 | $15.20 |
| 10 | $13.85 | $138.50 |
| 100 | $12.1 | $1,210.00 |
| 500 | $10.65 | $5,325.00 |
| 1,000 | $9.4 | $9,400.00 |
AD7707BRZ-REEL 개요
A sigma-delta ADC is a converter architecture that oversamples the input signal and uses noise-shaping to push quantization noise out of the baseband, achieving excellent resolution and inherent digital filtering for low-frequency measurements. As part of the broader family of precision ADCs, the AD7707 combines analog front-end conditioning, PGA, and digital filtering on a single die — a complete analog front end IC. The device includes on-chip calibration that removes zero-scale and full-scale errors and corrects endpoint drift over temperature.
Key specifications include 16-bit resolution with no missing codes, ±0.003% accuracy (effective resolution), and a low input signal rms noise suitable for strain gauge, thermocouple, and RTD front ends. The serial interface allows direct connection to microcontrollers, DSPs, or SPI-compatible controllers. Differential reference inputs and a 3-channel differential/pseudo-differential input mux support gain settings from 1 to 128, allowing direct interface to small-amplitude transducer outputs.
The architecture integrates a programmable gain amplifier (PGA), sigma-delta modulator, digital filter, clock generator, and calibration logic on a single CMOS die, eliminating external signal conditioning in many transducer-based designs. The self-calibration modes (self-calibration, system calibration, and background calibration) remove gain and offset errors, while the chop-mode option minimizes drift over time and temperature.
Typical applications include industrial process control, weigh scales and load cells, temperature measurement via thermocouples or RTDs, pressure sensors, smart transmitters, and portable instrumentation. The 1 mW power dissipation and 3 V supply make it especially attractive for loop-powered 4-20 mA smart sensors and battery-powered data acquisition.
When designing with this device, pay attention to reference voltage stability: the ADC's accuracy is bound by the reference noise and drift. Choose a low-noise, low-drift reference and place it close to the REFIN± pins. Decouple AVDD and DVDD separately with 0.1 µF and 10 µF capacitors.
This page synthesizes distributor pricing, drop-in alternative cross-references, and application design notes for engineers evaluating the AD7707BRZ-REEL for low-frequency measurement front ends.
드롭인 대체품: AD7707BRZ-REEL — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: AD7707BRZ-REEL (동일 폼 팩터 및 풋프린트) — 차이점: Package, Resolution, Architecture, Input Type, Number of Channels.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD7707BRZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7707BRZ-REEL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7707BR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7707BR-REEL
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7707BRZ-REEL
✓ 재고 있음
$9.4 / 개
데이터시트 보기 →AD7707BRZ-REEL 최대 정격 & 전기적 특성
| 분해능 | 16 bits |
| Number of Channels | 3 (2 fully differential / pseudo-differential via MUX) |
| Architecture | Sigma-Delta |
| 입력 전압 범위 | ±10 V (after on-chip attenuation) |
| Supply Voltage (Analog) | 3 V / 5 V |
| Power Dissipation | 1 mW typical |
| Accuracy | ±0.003% |
| Missing Codes | None (16-bit guaranteed) |
| Gain Range | 1 to 128 (programmable) |
| Output Interface | Serial (SPI / DSP compatible) |
| On-chip Calibration | Self-cal, system-cal, background-cal |
| Reference Input | Differential (REFIN+, REFIN-) |
| 패키지 | 20-SOIC (Wide body) |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
AD7707BRZ-REEL 핀 구성
| 핀 1 | SCLK — Serial Clock input for the SPI/QSPI/MICROWIRE interface |
| 핀 2 | DOUT — Serial Data Output (ADC register data) |
| 핀 3 | DIN — Serial Data Input (write to ADC registers) |
| 핀 4 | DRDY — Data Ready output (active low) |
| 핀 5 | CS — Chip Select input (active low) |
| 핀 6 | RESET — Reset input (active low) |
| 핀 7 | MODE — Serial Interface Mode Select (clocked or transparent) |
| 핀 8 | DGND — Digital Ground |
| 핀 9 | DVDD — Digital Supply Voltage (3 V or 5 V) |
| 핀 10 | AVDD — Analog Supply Voltage (3 V or 5 V) |
| 핀 11 | AGND — Analog Ground |
| 핀 12 | REFIN+ — Positive Reference Input (differential) |
| 핀 13 | REFIN- — Negative Reference Input (differential) |
| 핀 14 | AIN1+ — Analog Input 1 Positive |
| 핀 15 | AIN1- — Analog Input 1 Negative |
| 핀 16 | AIN2 — Analog Input 2 |
| 핀 17 | AIN3 — Analog Input 3 |
| 핀 18 | NC — Not connected (per datasheet) |
| 핀 19 | NC — Not connected (per datasheet) |
| 핀 20 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
AD7707BRZ-REEL 적합 용도: 6 애플리케이션s: Weigh Scale / Load Cell Front End, Thermocouple Temperature Measurement, RTD Temperature Measurement, Industrial Process Control / 4-20 mA Smart Transmitter, Pressure Sensor Signal Conditioning, Portable Data Acquisition / Handheld Instrumentation.
Weigh Scale / Load Cell Front End
The AD7707BRZ-REEL is purpose-built for weigh scale and load cell front ends due to its 16-bit no-missing-codes resolution and programmable PGA gains of 1 to 128. Most load cells output 2-3 mV/V at full scale, requiring a high-gain front end — the AD7707BRZ-REEL's on-chip PGA eliminates external instrumentation amplifiers. Low input-referred noise and ±0.003% post-calibration accuracy map directly to stable weight readings, while the 3 analog inputs allow simultaneous measurement of reference, sense, and load cell signals, or multi-load-cell platforms. The 1 mW power dissipation suits battery-powered portable scales. Mounting in a 20-SOIC wide-body package, the part shares DIN-rail footprint conventions with industrial weighing instrumentation, allowing direct interface to bridge-type load cells via simple RC filters on the AIN pins.
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Thermocouple Temperature Measurement
The AD7707BRZ-REEL is well matched to thermocouple-based temperature measurement because of its low input-referred noise, differential inputs with PGA, and built-in calibration that nulls offset drift. A type K thermocouple produces roughly 41 µV/°C, easily resolved at the AD7707BRZ-REEL's gain-of-128 setting, where input noise floor is well under 1 µVrms. Cold-junction compensation is implemented with a separate temperature sensor (e.g., AD592) measuring the terminal block, with both signals routed into the AD7707BRZ-REEL's 3 analog inputs. The 16-bit resolution, combined with the digital filter's narrow-band sinc response at the chosen output data rate, rejects 50/60 Hz mains noise — critical for industrial thermocouple instrumentation. Wide ±10 V input tolerance adds protection against thermocouple wiring faults.
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RTD Temperature Measurement
RTD (Resistance Temperature Detector) measurements benefit from the AD7707BRZ-REEL's differential inputs, programmable gain, and low input noise. A Pt100 RTD driven with a precision reference current source produces a 0.385 Ω/°C change, which the AD7707BRZ-REEL resolves with 16-bit accuracy after the on-chip PGA boosts the small signal. The 3 analog input channels can support 3-wire RTD configurations with lead-resistance compensation using the dual current sources typically employed in industrial RTD transmitters. The ±10 V bipolar input range handles the common-mode shift between RTD legs in bridge configurations. Low drift enabled by background calibration maintains measurement accuracy over industrial temperature ranges of -40 °C to +85 °C required for process automation.
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Industrial Process Control / 4-20 mA Smart Transmitter
The AD7707BRZ-REEL's 1 mW power dissipation from a 3.3 V or 5 V supply is ideal for loop-powered 4-20 mA smart transmitters. In a typical smart transmitter, the AD7707BRZ-REEL digitizes sensor input (pressure, temperature, flow) while the rest of the loop electronics drive a 4-20 mA output proportional to the measurement. The 16-bit resolution directly determines the transmitter's effective bit count, and the on-chip PGA accommodates the wide dynamic range of sensor outputs. The wide SOIC-20 package handles industrial temperature ranges and the analog front end's ESD/surge transients typical of process plant wiring. A separate analog and digital supply pin pair allows careful isolation between the noisy loop-current drive and the precision ADC measurement path.
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Pressure Sensor Signal Conditioning
Bridge-type pressure sensors typically output 1-3 mV/V full scale, and the AD7707BRZ-REEL's programmable gain of 1 to 128 directly digitizes such low-level signals without external amplification. Differential inputs handle the bridge configuration while the on-chip digital filter rejects ambient 50/60 Hz mains pickup common in industrial environments. Self-calibration and system-calibration modes correct zero-pressure and full-scale pressure drift over the industrial temperature range, enabling <0.1% FS accuracy for medical and process pressure measurement. The 3 input channels allow simultaneous measurement of pressure plus auxiliary temperature (for compensation) plus a diagnostic reference. Low power operation extends battery life in portable pressure calibrators and field instruments.
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Portable Data Acquisition / Handheld Instrumentation
Battery-powered portable data loggers and handheld calibrators benefit from the AD7707BRZ-REEL's 1 mW power dissipation and 3 V supply operation. The 16-bit resolution and on-chip digital filtering provide accuracy approaching benchtop instrumentation while running from two AA cells with a switching regulator. The 3 analog inputs accommodate most portable measurement tasks (single transducer plus reference plus auxiliary), while the SPI/QSPI serial interface connects directly to low-power MCUs (e.g., ADuC7024) used in handheld instruments. Compact SOIC-20 packaging keeps the BOM small, and the wide operating temperature range allows field deployment in industrial and outdoor environments.
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추천 제품 요약
엔지니어링 참조 데이터: AD7707BRZ-REEL — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AD7707BRZ | AD7707BRZ-REEL7 | AD7707BR | AD7707BR-REEL |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 20-SOIC (Wide body) | 20-SOIC (Wide body) - same | 20-SOIC (Wide body) - same | 20-SOIC (Wide body) - same | 20-SOIC (Wide body) - same |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits |
| Channels | 3 (MUX) | 3 (MUX) | 3 (MUX) | 3 (MUX) | 3 (MUX) |
| Input Range | ±10 V (with attenuator) | ±10 V (with attenuator) | ±10 V (with attenuator) | ±10 V (with attenuator) | ±10 V (with attenuator) |
| Power Dissipation | 1 mW typical | 1 mW typical | 1 mW typical | 1 mW typical | 1 mW typical |
| Supply Voltage | 3 V / 5 V | 3 V / 5 V | 3 V / 5 V | 3 V / 5 V | 3 V / 5 V |
| Pb-Free / RoHS | Yes (lead-free Z finish) | Yes (lead-free Z finish) | Yes (lead-free Z finish) | No (Pb-bearing finish) | No (Pb-bearing finish) |
| Shipping Carrier | 13-inch Reel | Tube (no reel) | 7-inch Reel | Tube (no reel) | 13-inch Reel |
주요 차별점
- 3-channel input mux in same 20-SOIC footprint (vs AD7708 (16-bit single-channel))
- Built-in ±10 V input attenuator (vs AD7799 (24-bit, lower input range))
- Background calibration option for drift compensation (vs Self-calibration only on older AD77xx parts)
설계 노트
Estimated: the AD7707BRZ-REEL dissipates approximately 1 mW from a single 3.3 V or 5 V supply per the datasheet figure (I_AVDD + I_DVDD at nominal sampling rate). Place a 0.1 µF ceramic decoupling capacitor as close as possible to each AVDD and DVDD pin, with a 10 µF bulk tantalum or ceramic bypass capacitor on the analog supply rail. Separate analog and digital grounds (AGND, DGND) should connect at a single point near the ADC to avoid digital return currents coupling into the analog front end. For loop-powered 4-20 mA smart transmitters, derive AVDD from a low-dropout regulator after the loop current sense resistor; never power AVDD directly from the loop — the dropout will starve the ADC during fault conditions.
Place the AD7707BRZ-REEL as close as possible to the transducer connectors to minimize noise pickup on the analog traces. Use differential routing for AIN+/AIN- pairs with matched trace lengths and a ground guard trace on each side to reject common-mode noise from the digital section. Reference input traces (REFIN+, REFIN-) require the same care — any noise on the reference injects directly into the conversion result. Place the external reference IC adjacent to the AD7707BRZ-REEL with its own local bypass capacitors. Keep digital lines (SCLK, DOUT, DIN, DRDY, CS) away from the analog input traces; route them on the opposite side of the PCB if the board is two-layer. The wide-body SOIC-20 footprint allows use of a 4-layer board with dedicated analog and digital ground/power planes.
Avoid the following common pitfalls when designing with the AD7707BRZ-REEL: (1) Do not rely on uncalibrated accuracy — the ±0.003% spec assumes self-calibration or system-calibration has been run after power-up. (2) Do not exceed VDD on any analog input; the on-chip attenuator tolerates ±10 V only with the analog supply at or above 5 V, with reduced tolerance at 3 V operation. (3) Note that CS must be held low to access the serial interface — accidentally leaving it floating can cause intermittent communication failures. (4) Do not connect the NC pins (18, 19, 20) to any signal; they are No-Connect per the datasheet and adding traces can couple noise into the die. (5) Ensure the chosen output data rate (set by the FS register) leaves enough time for settling — at 60 Hz mains rejection mode, the first conversion after a channel change may not be valid; discard it.
The AD7707BRZ-REEL's digital filter provides excellent 50/60 Hz mains noise rejection when configured for the appropriate notch frequencies (selectable via the FS register). The sinc³ filter's first null occurs at the programmed output data rate; for 60 Hz rejection at 10 Hz output rate, the -3 dB bandwidth is approximately 2.6 Hz with >100 dB stopband attenuation at 60 Hz. Use the FS0-FS3 bits to trade off resolution vs output data rate — at the slowest rates the part achieves true 16-bit noise performance. For sensor signals embedded in switching-converter noise, position the digital filter null at the switching frequency to maximize rejection. Avoid driving the analog inputs with high-impedance sources (>10 kΩ) without an input buffer — the switched-capacitor input draws charge spikes that can degrade linearity.
규정 준수 정보
RoHS compliant via the Z (lead-free) finish per the part number. Not AEC-Q100 qualified; automotive users should consult Analog Devices automotive-grade portfolio for equivalent parts. REACH SVHC declaration available on Analog Devices website.
