AD7715ACHIPS-5 - 16-Bit Sigma-Delta ADC, 3V/5V, 450uA | Analog Devices
부품 번호: AD7715ACHIPS-5 ✗ 단종| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $25 | $25.00 |
| 10 | $22.5 | $225.00 |
| 100 | $19.8 | $1,980.00 |
| 500 | $17.4 | $8,700.00 |
| 1,000 | $14.95 | $14,950.00 |
AD7715ACHIPS-5 개요
A sigma-delta (sigma-delta) ADC is a class of oversampling converter that trades high sampling rate for very high resolution and excellent inherent anti-aliasing behavior; the AD7715 uses this architecture to deliver 16-bit noise-free code performance directly from a low-noise on-chip modulator and digital filter. It sits within the broader hierarchy of data acquisition (DAQ) ICs -> analog-to-digital converters -> precision ADCs -> sigma-delta converters -> semiconductor ICs, making it suitable for systems where DC accuracy and low-frequency noise rejection matter more than raw bandwidth.
Key features include a 16-bit (no-missing-codes) guaranteed resolution, low total supply current (450 uA typical at 3 V), on-chip programmable-gain front end supporting input ranges from 0 mV to 20 mV up to 0 V to 2.5 V (with 5 V supply), self-calibration and system-calibration modes, and a flexible 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and most DSP serial ports. The digital filter offers programmable first-notch frequency, allowing the device to trade output data rate for settling time.
The device accepts a master clock up to 5 MHz (5 V) or 2.4576 MHz (3 V), enabling output data rates between a few Hz and a few hundred Hz. Its on-chip PGA simplifies transducer interfacing by accepting low-level signals directly without external instrumentation amplifiers. Designers should note that the CHIPS (bare die) variant is intended primarily for hybrid / micro-module assemblies, where wire bonding and die attach are required; commercial PCB designs typically use the AD7715ANZ or AD7715ARZ5 SOIC / PDIP versions.
Typical applications include weigh scales and load-cell digitizers, industrial process-control transmitters, portable and battery-powered instrumentation, temperature measurement with bridge or RTD sensors, and smart pressure transmitters. The low 450 uA quiescent current also makes it suitable for loop-powered 4-20 mA sensor transmitters where total system power budget is critical.
When designing with this part, attention to grounding and decoupling is essential because the converter's high resolution can otherwise be limited by analog supply noise; place a 0.1 uF decoupling capacitor close to each supply pin and route digital ground return away from the analog input traces. For sensor applications, the PGA gain and output data rate should be selected together because higher PGA gain increases input-referred noise at the modulator output.
드롭인 대체품: AD7715ACHIPS-5 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: AD7715ACHIPS-5 (동일 폼 팩터 및 풋프린트) — 차이점: Calibration, Resolution, Serial Interface, Supply Voltage.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
이 제품에는 사용 가능한 드롭인 대체품이 없습니다.
대체품 요청AD7715ACHIPS-5 최대 정격 & 전기적 특성
| Architecture | 16-bit sigma-delta ADC |
| 분해능 | 16 bits, no missing codes |
| Number of Input Channels | 1 differential / pseudo-differential |
| 공급 전압 | 3 V or 5 V nominal |
| Total Supply Current | 450 uA typical at 3 V supply |
| Master Clock Frequency | Up to 5 MHz at 5 V, up to 2.4576 MHz at 3 V |
| On-chip PGA | Yes, programmable gain (1 to 128) |
| Input Range | 20 mV to 2.5 V (gain-dependent, 5 V supply) |
| Output Data Rate | Programmable via digital filter first-notch (typ. 10 Hz to 1 kHz) |
| Calibration | Self-calibration and system-calibration modes |
| Serial Interface | SPI, QSPI, MICROWIRE, DSP-compatible 3-wire serial |
| 패키지 | Bare die (CHIPS) |
| 동작 온도 | -40C to +85C (industrial) |
| RoHS 상태 | Compliant (per Analog Devices product page) |
| Lead-Free | Yes (bare-die construction - consult factory) |
AD7715ACHIPS-5 bare die (chips) 핀 구성 가이드
AD7715ACHIPS-5(bare die (chips) 패키지)의 핀 구성입니다. 이 아날로그 부품에는 입력, 출력, 전원 공급 핀이 있습니다. 오프셋 널, 보상, 인에이블 핀 구성은 제조사 데이터시트를 참조하십시오. 신호 컨디셔닝 및 증폭기 회로에 이상적입니다.
다음에 대한 상세 핀아웃 데이터 없음: AD7715ACHIPS-5.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
AD7715ACHIPS-5 적합 용도: 6 애플리케이션s: Weigh Scale / Load Cell Digitizer, Industrial Process Control / 4-20 mA Smart Transmitter, Portable Battery-Powered Instrumentation, Temperature Measurement with RTD / Thermocouple, Smart Pressure Transmitter, Low-Frequency Strain Gauge / Vibration Monitoring.
Weigh Scale / Load Cell Digitizer
The AD7715ACHIPS-5 is purpose-built for weigh scale and load cell signal chains. Its 16-bit sigma-delta resolution combined with the on-chip programmable-gain amplifier (gains of 1 to 128) digitizes low-level bridge outputs directly without external instrumentation amplifiers, achieving noise-free code performance below 0.5 uV rms at typical output data rates around 60 Hz. The integrated digital filter rejects 50/60 Hz line interference that would otherwise couple into the sensitive analog front end, while self-calibration compensates offset and gain drift across industrial temperature ranges from -40C to +85C. The 450 uA supply current supports battery-powered scales, and the bare-die format enables integration directly into the load-cell housing for a single-module assembly. Engineers typically pair the AD7715ACHIPS-5 with a low-noise reference such as the AD780 and an RTD or thermistor for temperature compensation in the same calibration cycle.
추천
Industrial Process Control / 4-20 mA Smart Transmitter
In 4-20 mA loop-powered smart transmitters the AD7715ACHIPS-5's 450 uA typical supply current leaves ample headroom for the 4-20 mA loop regulation and sensor excitation. Its pseudo-differential input stage accepts pressure, flow, or differential pressure transducer signals directly, and the programmable output data rate can be tuned between 10 Hz and 1 kHz to match HART or Foundation Fieldbus communication windows. The on-chip calibration routines enable automatic zero and span compensation each power-up, eliminating manual trim in the field. The CHIPS bare-die package is preferred here because the entire transmitter electronics can be housed inside the sensor body as a single hybrid module, saving PCB area. Combined with an isolation barrier such as the ADuM1411 and a HART modem like the AD5700, the AD7715ACHIPS-5 anchors the analog front end of industrial transmitters.
추천
Portable Battery-Powered Instrumentation
Low-power instrumentation such as handheld multimeters, portable gas detectors, and field data loggers benefits from the AD7715ACHIPS-5's 450 uA supply current and 3 V operation. The on-chip PGA accepts signals as low as 20 mV full-scale, eliminating external instrumentation amplifiers that would otherwise drain battery budget. The 3-wire SPI/QSPI/MICROWIRE-compatible serial interface connects directly to low-power microcontrollers such as the MSP430 or PIC, allowing the entire measurement chain to enter sleep between conversions and extend battery life to months. The bare-die form factor further shrinks the PCB footprint, which is critical for handhelds where every cubic millimeter is contested. Combined with a low-dropout regulator and a lithium coin cell, the AD7715ACHIPS-5 enables true years-long battery life in periodic-sampling applications.
추천
Temperature Measurement with RTD / Thermocouple
The AD7715ACHIPS-5 digitizes resistance-temperature-detector (RTD) and thermocouple signals with 16-bit accuracy in industrial and laboratory temperature measurement chains. The on-chip PGA provides the gain required to amplify the small RTD voltage (typically 100 uV per degree Celsius from a Pt100 sensor with 1 mA excitation) to a level that utilizes the full converter input range. Self-calibration compensates for cold-junction compensation sensor drift in thermocouple chains, and the programmable digital filter removes mains-frequency pickup common in factory environments. The 450 uA quiescent current enables battery-powered thermocouple data loggers, and the bare-die format supports integration directly into the probe handle.
추천
Smart Pressure Transmitter
Smart pressure transmitters in process and HVAC applications use the AD7715ACHIPS-5 to digitize bridge-type pressure sensors with high linearity and stability. The pseudo-differential input stage accepts the bridge output directly, while the on-chip PGA raises the millivolt-level signals to a full-scale input range that maximizes ADC dynamic range. The 16-bit resolution delivers pressure measurements with better than 0.01 percent full-scale accuracy after calibration, which exceeds the accuracy required for most industrial pressure standards. The 450 uA supply current supports loop-powered designs drawing less than 3 mA total, leaving current for the HART modem and sensor excitation. Combined with a temperature-compensated pressure sensor and a HART modem, the AD7715ACHIPS-5 forms the heart of a high-performance smart pressure transmitter.
추천
Low-Frequency Strain Gauge / Vibration Monitoring
Structural-health monitoring, weigh-in-motion systems, and industrial vibration analyzers use the AD7715ACHIPS-5 to digitize strain gauge and piezoelectric sensor signals at low to moderate frequencies. The sigma-delta architecture provides inherent anti-aliasing, simplifying the analog input filter chain and eliminating the need for high-order anti-aliasing filters at the input. Programmable output data rates between 10 Hz and 1 kHz accommodate typical vibration spectra in rotating machinery, and the on-chip calibration routines compensate for temperature-induced drift in the gauge factor. The bare-die format supports embedding the converter directly into the sensor housing, minimizing analog trace lengths and reducing EMI pickup in electrically noisy factory environments.
추천
추천 제품 요약
엔지니어링 참조 데이터: AD7715ACHIPS-5 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AD7715ANZ-5 | AD7715ARZ5 | AD7708BRU-REEL | AD7707BRZ-REEL | AD7190 |
|---|---|---|---|---|---|---|
| Package | Bare Die (CHIPS) | PDIP-16 | SOIC_W-16 | TSSOP-16 | SOIC-16 | TSSOP-24 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Architecture | 16-bit sigma-delta | 16-bit sigma-delta | 16-bit sigma-delta | 16-bit sigma-delta | 16-bit sigma-delta | 24-bit sigma-delta |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 24 bits |
| Input Channels | 1 differential | 1 differential | 1 differential | 8/10 channel | 2 differential | 1 differential |
| Supply Voltage | 3 V / 5 V | 3 V / 5 V | 3 V / 5 V | 3 V / 5 V | 3 V / 5 V | 3.3 V / 5 V |
| On-chip PGA | Yes (1 to 128) | Yes (1 to 128) | Yes (1 to 128) | Yes | Yes | Yes (1 to 128) |
주요 차별점
- Hybrid-assembly-ready bare-die format (vs AD7715ANZ-5 (PDIP-16))
- On-chip programmable-gain amplifier with gain to 128 (vs AD7707BRZ-REEL (2-channel))
- 16-bit resolution with no missing codes and integrated digital filter (vs AD7190 (24-bit))
설계 노트
Estimated: The AD7715ACHIPS-5 draws approximately 450 uA total supply current at 3 V. For a 3.6 V Li-ion battery-powered design, ensure the entire sensor signal chain (regulator + reference + ADC + microcontroller) draws less than the available battery budget; the AD7715's 450 uA is typically 30-50 percent of a low-power data-logger's total quiescent current. Decouple each analog supply pin (AVDD, DVDD) with a 0.1 uF ceramic capacitor placed within 2 mm of the die pads, and provide a 10 uF bulk capacitor on the AVDD rail to absorb reference-current transients during calibration cycles.
The bare-die CHIPS package requires wire bonding and chip-on-board assembly rather than standard PCB footprints. Keep wire bond lengths as short as possible (under 2 mm) to minimize series inductance on the supply, reference, and analog input bonds; longer bonds couple digital switching noise into sensitive analog inputs. Place a guard ring tied to analog ground around the analog input bonds, and route digital signals (SCLK, DOUT, DRDY) on the opposite side of the substrate from the analog input bonds to prevent digital-to-analog crosstalk.
Do not exceed the maximum master clock frequency of 5 MHz at 5 V supply or 2.4576 MHz at 3 V supply; faster clocks degrade noise performance and may violate the modulator's stability criterion. Always run a self-calibration cycle (writing to the OFFSET and GAIN registers) after every power-up and after any change to PGA gain, output data rate, or analog input range; uncorrected offset and gain errors can dominate the 16-bit code accuracy. The DRDY signal indicates conversion completion - do not poll DRDY by reading SCLK transitions, as this can corrupt the ongoing conversion. According to the Analog Devices datasheet, the digital filter settling time depends on the chosen output data rate, and any input-range or gain change requires waiting the full filter settling time before the next valid conversion.
The on-chip sigma-delta modulator samples the analog input at the modulator frequency; the high-frequency switching noise at this node can radiate to nearby analog traces if the input signal traces are long. Keep the analog input traces short and symmetrical (matched lengths for AIN+ and AIN-) to preserve common-mode rejection. A 100 nF ceramic capacitor directly at the ADC input bonds provides a local charge reservoir for the modulator's sampling transients, and a low-pass RC filter (typically 1 kohm + 100 nF) ahead of the ADC further attenuates RF interference common in factory environments.
규정 준수 정보
Per Analog Devices product page, the AD7715 family is RoHS compliant. Bare-die CHIPS variants are not AEC-Q100 qualified - automotive applications should use the AD7190 or a packaged AD7715 variant with explicit automotive qualification.
