AD7715ACHIPS-3 - 16-Bit Sigma-Delta ADC, 3V, 450uA | ADI
부품 번호: AD7715ACHIPS-3 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.4 | $164.00 |
| 100 | $14.2 | $1,420.00 |
| 500 | $12.6 | $6,300.00 |
| 1,000 | $11.25 | $11,250.00 |
AD7715ACHIPS-3 개요
What is a sigma-delta ADC? A sigma-delta (ΣΔ) ADC is a class of oversampling converter that trades raw speed for very high resolution by pushing quantization noise out of the signal band using a modulator and a digital filter. Within the broader hierarchy, the AD7715ACHIPS-3 sits in the precision converter category (ADC > sigma-delta ADC > low-frequency precision ADC > data acquisition IC > signal conditioning > power management), and is intended for transducer-based measurements where DC accuracy and noise rejection matter more than throughput.
Key features include 16-bit resolution with no missing codes, very low 450 uA supply current at 3 V/1 MHz, a charge-balancing front end that simplifies external antialias filtering, programmable gains up to 128 for direct bridge or thermocouple hookups, and self-calibration options that remove zero-scale and full-scale errors. The differential input pair can accept unipolar or true bipolar input ranges when the part is operated from a 5 V supply rail (AD7715-5 variant).
Architecturally, the converter combines a switched-capacitor modulator and a digital filter on a single CMOS die, achieving the same effective resolution as discrete modulator-plus-filter designs at a fraction of the power. The internal calibration registers capture system offset and gain at the user's programmed update rate, allowing the ADC to compensate for front-end drift without processor intervention.
Typical applications include weigh scales and load-cell bridges, thermocouple cold-junction compensation, portable industrial instrumentation, and pressure transducer readouts. Because the device is offered in CHIPS (bare-die) form, integrators typically embed it inside custom sensor modules, hybrid microcircuits, or harsh-environment packages where standard PDIP/SOIC would not survive.
When designing with this part, pay particular attention to PCB layout for the bare die: bond wires must be short and Kelvin-bonded to the analog inputs to avoid thermocouple-induced offsets. Programming gain to 128 amplifies both signal and noise, so external noise budgeting is critical.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the AD7715ACHIPS-3 not found in any single manufacturer datasheet.
드롭인 대체품: AD7715ACHIPS-3 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: AD7715ACHIPS-3 (동일 폼 팩터 및 풋프린트) — 차이점: Calibration, Resolution, Serial Interface, Supply Voltage.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD7715ACHIPS-5
✅ 드롭인✓ 재고 있음
$14.95 / 개
데이터시트 보기 →AD7715ACHIPS-3 최대 정격 & 전기적 특성
| 분해능 | 16 bits |
| Number of Inputs | 1 differential |
| ADC Architecture | Sigma-Delta (charge balancing) |
| 공급 전압 | 3 V nominal (3 V variant; -5 variant operates at 5 V) |
| 공급 전류 | 450 uA max at 3 V / 1 MHz MCLK |
| Master Clock Range | 1 MHz typical (see datasheet) |
| Integral Nonlinearity (INL) | 0.0015% |
| Missing Codes | None (16 bits guaranteed) |
| Programmable Gains | 1, 2, 32, 128 |
| Input Type | Differential analog input pair |
| Serial Interface | 3-wire SPI/QSPI/MICROWIRE compatible |
| Package Type | Bare die / CHIPS |
| Terminal Count | 16 (die pads) |
| Calibration | On-chip self-calibration (zero-scale, full-scale) |
AD7715ACHIPS-3 bare die / chips 핀 구성 가이드
AD7715ACHIPS-3(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-3.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
AD7715ACHIPS-3 적합 용도: 7 애플리케이션s: Weigh Scales and Load-Cell Bridges, Thermocouple and Temperature Acquisition, Pressure Transducer Readout Modules, Portable Industrial Instrumentation, Medical Monitoring and Diagnostic Equipment, Strain-Gauge Structural Health Monitoring, Hybrid Microcircuit and Chip-on-Board Modules.
Weigh Scales and Load-Cell Bridges
The AD7715ACHIPS-3 fits weigh-scale and bridge-based force measurement because its 128 programmable gain lets it directly digitize millivolt-level bridge outputs without front-end instrumentation amplifiers. The differential analog input rejects mains-frequency common-mode noise typical of industrial shop floors, and the 450 uA supply current at 3 V allows battery operation. According to the Analog Devices datasheet, on-chip self-calibration cancels offset and gain drift over time, keeping the scale within calibration for years.
추천
Thermocouple and Temperature Acquisition
For thermocouple cold-junction compensation the AD7715ACHIPS-3's gain of 128 maps the few-millivolt thermocouple output across most of the converter's 16-bit range, while the charge-balancing front end rejects 50 Hz/60 Hz line pickup common in industrial plants. The bare-die CHIPS form lets designers mount the ADC directly inside the probe housing, eliminating long cable runs that would otherwise inject thermocouple-induced offsets. Per the datasheet, paired with an external precision reference it can resolve sub-degree-C temperature changes.
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Pressure Transducer Readout Modules
The AD7715ACHIPS-3 is widely used inside hybridized pressure-sensor modules because the bare die can be bonded directly to the strain-gauge bridge inside a sealed housing, eliminating cabling and connector-related drifts. With programmable gain of 32 or 128 it digitizes typical 3 mV/V bridge outputs with 16-bit effective resolution, while the 3 V supply and 450 uA budget suit loop-powered or battery-powered transmitters. The Analog Devices datasheet documents self-calibration routines that the host MCU can run on power-up to remove sensor offset and span error.
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Portable Industrial Instrumentation
Battery-powered handheld meters and field calibrators benefit from the AD7715ACHIPS-3's 450 uA supply current at 3 V, which is much lower than typical 5 V general-purpose ADCs. The 3-wire serial interface shares pins with most microcontrollers and DSPs, freeing board area for displays or radios. The CHIPS bare-die form lets designers shrink the meter enclosure without sacrificing ADC performance, an important constraint when the converter must fit alongside keypad, battery, and isolation barriers in industrial products.
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Medical Monitoring and Diagnostic Equipment
Patient monitors and small benchtop diagnostic instruments use the AD7715ACHIPS-3 to digitize signals from strain-gauge respiration belts, invasive pressure transducers, and other low-frequency physiological sensors. The 16-bit effective resolution at low update rates provides the dynamic range needed for medical signals, while the differential inputs reject common-mode noise from electrocautery and other hospital interference. The bare-die form permits integration into single-use or disposable medical modules, an important manufacturing consideration for high-volume medical OEMs.
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Strain-Gauge Structural Health Monitoring
Wireless structural monitoring nodes mounted on bridges, towers, and aerospace structures use the AD7715ACHIPS-3 for its high gain (128) and very low 450 uA supply current, which together maximize battery life while digitizing sub-millivolt strain-gauge outputs. The bare-die CHIPS form lets the designer mount the ADC inside a sealed transducer housing, eliminating the need for an external ADC chip that would otherwise increase node size and connector count. Per the Analog Devices datasheet, on-chip calibration supports long-term stability for unattended deployments that must operate for years on a single battery.
추천
Hybrid Microcircuit and Chip-on-Board Modules
Because the AD7715ACHIPS-3 ships as a verified bare die with documented bond-pad coordinates, hybrid manufacturers can integrate it into thick-film or thin-film ceramic modules for aerospace, defense, and down-hole oil-drilling applications where standard molded parts would fail. The CHIPS form avoids plastic-package outgassing and allows direct bonding to thick-film resistors, reducing parasitics on critical analog signal paths. Per the Analog Devices datasheet, this is also the preferred route for high-shock and high-vibration environments that exceed molded-package qualification levels.
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추천 제품 요약
엔지니어링 참조 데이터: AD7715ACHIPS-3 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AD7715ACHIPS-5 |
|---|---|---|
| Brand | Analog Devices | Analog Devices |
| Package | DIE / CHIPS (bare die) | DIE / CHIPS (bare die) - same |
| Resolution | 16 bits | 16 bits |
| Supply Voltage | 3 V nominal | 5 V nominal |
| Supply Current | 450 uA max at 3 V / 1 MHz | 450 uA max at 5 V / 1 MHz |
| Input Range | Unipolar differential (3 V variant) | Bipolar differential (5 V variant) |
| Programmable Gains | 1, 2, 32, 128 | 1, 2, 32, 128 - same |
| INL | 0.0015% | 0.0015% - same |
주요 차별점
- Charge-balancing front end simplifies anti-alias filtering (vs AD7705)
- Bare-die CHIPS form factor for hybrid integration (vs AD7715AR-3 (SOIC_W-16))
- Lowest quiescent current in its precision 16-bit ADC family (vs AD7714ACHIPS-3)
설계 노트
For bare-die assembly (CHIPS), use short, parallel bond wires to the analog input pads with Kelvin connections to the bridge or sensor element. According to the Analog Devices datasheet, bond-wire length mismatch on the analog inputs introduces thermocouple-induced offsets that can dominate the converter's 16-bit noise floor, so symmetric layout is critical. Keep digital bond wires (SCLK, DOUT, DRDY) physically separated from analog bond wires to avoid coupling; route traces over a continuous analog ground plane beneath the die.
Decouple the +3 V supply with at least 10 uF of bulk capacitance and a 100 nF ceramic capacitor placed within 5 mm of the die pads to prevent digital switching transients from coupling into the modulator. According to the AD7715 datasheet, the analog and digital +3 V pins can be tied together at the die but should be filtered separately at the PCB side to avoid back-feeding logic noise into the analog front end. A separate low-noise LDO such as an ADP7102 is recommended for the ADC supply in precision weigh-scale designs.
Estimated: at the maximum gain of 128 the analog input full-scale range compresses to roughly ±20 mV (bipolar) or 0 to 20 mV (unipolar) per the AD7715 datasheet, so layout-induced thermocouple offsets and external EMI can easily exceed the input signal. Common pitfalls include driving the analog input pins directly with long shielded cables (use a low-pass RC network instead) and operating the chip at master-clock frequencies above 2.5 MHz without re-evaluating noise figures.
Run on-chip self-calibration on every power-up using the zero-scale and full-scale registers per the datasheet; this removes both the internal ADC errors and the front-end buffer offsets when the input is shorted to ground. According to the Analog Devices datasheet, calibration should be re-run if the operating temperature shifts by more than 10 C or the programmable gain is changed. Calibration coefficients are stored in on-chip registers, but host firmware must reload them after every reset or power cycle.
규정 준수 정보
RoHS/REACH status for AD7715ACHIPS-3 must be verified against the specific die lot because bare-die products are integrated into hybrid modules whose overall compliance depends on the host substrate. The AD7715 family is supplied lead-free per Analog Devices documentation. AEC-Q100 is not applicable for industrial-grade precision ADCs of this type.
