AD7476BRTZ-REEL - 12-bit 1MSPS SAR ADC | Analog Devices
부품 번호: AD7476BRTZ-REEL ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $4.5 | $4.50 |
| 10 | $4.05 | $40.50 |
| 100 | $3.6 | $360.00 |
| 500 | $3.2 | $1,600.00 |
| 1,000 | $2.85 | $2,850.00 |
AD7476BRTZ-REEL 개요
A successive-approximation ADC is a type of data converter that resolves the input voltage one bit per clock cycle against an internal precision DAC, producing a deterministic, low-latency conversion with no pipeline delay. SAR ADCs sit within the broader hierarchy of analog-to-digital converter -> data converter -> mixed-signal IC -> semiconductor, and are favored where low latency, small package size, and ease of use matter more than the very highest conversion rates. The AD7476 family (AD7476/AD7477/AD7478) shares this architecture at 12-, 10-, and 8-bit resolutions respectively.
Key specifications include 1 MSPS throughput, 12-bit resolution with no missing codes, a wide input bandwidth exceeding 6 MHz, and an on-chip low-noise track-and-hold amplifier. The part integrates a high-speed serial interface (SPI/QSPI/MICROWIRE-compatible), consumes low power at full speed, and offers flexible input ranges supporting both unipolar and bipolar operation when driven through an appropriate driver or reference.
Architecturally, the AD7476 uses a charge-redistribution capacitive DAC core with internal auto-calibration, which provides excellent DC accuracy and low integral nonlinearity across temperature. Its serial interface saves board area and simplifies isolation compared to parallel-output converters of similar speed.
Typical applications include portable instrumentation, data acquisition systems, battery-powered equipment, isolated industrial front ends, and precision sensor signal chains. The tiny SOT-23-6 footprint and 1 MSPS rate make it well-suited for compact, low-power designs that still require good DC accuracy.
When designing with this part, place the supply decoupling capacitor (typically 100 nF) within 5 mm of the AVDD pin and keep digital traces away from the analog input. For best linearity, drive the input with a low-impedance op-amp buffer rather than a high-impedance source. This page synthesizes distributor pricing, drop-in SOT-23-6 alternatives, and practical design notes not consolidated on the manufacturer datasheet alone.
드롭인 대체품: AD7476BRTZ-REEL — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: AD7476BRTZ-REEL (동일 폼 팩터 및 풋프린트) — 차이점: Data Interface, Package, Resolution, Number of Channels, Supply Voltage.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD7477BRTZ-REEL
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7478BRTZ-REEL
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7476BRTZ-R2
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7476BRTZ-REEL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7476BRTZ
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
AD7476BRTZ-REEL 최대 정격 & 전기적 특성
| 분해능 | 12 bits |
| Conversion Rate | 1 MSPS |
| Architecture | Successive Approximation (SAR) |
| 공급 전압 | 2.35 V to 5.25 V |
| Input Bandwidth (-3 dB) | > 6 MHz |
| Number of Channels | 1 |
| Input Type | Single-ended (pseudo-differential option with driver) |
| Data Interface | SPI/QSPI/MICROWIRE-compatible serial |
| Reference | External |
| 패키지 | SOT-23-6 (RT) |
| 동작 온도 | -40 C to +85 C (industrial) |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
| MSL 레벨 | 1 |
| Family Members | AD7476 (12-bit), AD7477 (10-bit), AD7478 (8-bit) |
AD7476BRTZ-REEL 핀 구성
| 핀 1 | AVDD — Analog supply voltage (2.35 V to 5.25 V) |
| 핀 2 | REF — External reference voltage input |
| 핀 3 | GND — Ground |
| 핀 4 | DOUT — Serial data output (SPI) |
| 핀 5 | CS — Chip select, active low |
| 핀 6 | SCLK — Serial clock input |
일반적인 애플리케이션
AD7476BRTZ-REEL 적합 용도: 6 애플리케이션s: Portable Data Acquisition, Industrial Process Control, Battery Monitoring Systems, Sensor Signal Conditioning, Medical Instrumentation, Isolated Measurement Front Ends.
Portable Data Acquisition
The AD7476BRTZ-REEL is well-suited for portable data acquisition systems where 12-bit precision at 1 MSPS in a SOT-23-6 footprint is required. The part's 2.35 V to 5.25 V supply range allows operation directly from a single lithium-ion cell or 3.3 V microcontroller supply without level shifting. Its SAR architecture delivers conversion results with zero pipeline delay, critical when sampling multiplexed sensor inputs in real time. According to the Analog Devices datasheet, the wide-bandwidth track-and-hold front end (>6 MHz) preserves signal integrity for transient captures.
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Industrial Process Control
In industrial process control loops, the AD7476BRTZ-REEL provides the latency-free conversion needed for closed-loop feedback. Its SAR architecture resolves the input in a single cycle, eliminating the pipeline delay that pipelined ADCs introduce. The 1 MSPS rate is more than sufficient for typical temperature, pressure, and flow sensor sampling rates of 1 kSPS to 100 kSPS, leaving substantial timing margin. Per the datasheet, the part operates over -40 C to +85 C with no missing codes, satisfying industrial environmental requirements.
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Battery Monitoring Systems
Battery monitoring systems benefit from the AD7476BRTZ-REEL's low power consumption, single-supply operation down to 2.35 V, and tiny SOT-23-6 footprint. The part can sample cell voltages directly when used with a resistor divider, and its CS-controlled power-down mode extends battery life between conversions. As of 2026-10-12, this 12-bit ADC provides approximately 1.22 mV LSB on a 5 V reference, sufficient resolution for state-of-charge estimation in 1S to 4S lithium packs.
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Sensor Signal Conditioning
The AD7476BRTZ-REEL pairs naturally with analog front-end op-amps in sensor signal conditioning chains. A typical configuration drives the ADC input with a low-impedance op-amp buffer (such as the AD8628) to preserve the SAR ADC's settling requirements during acquisition. According to the Analog Devices datasheet, the wide input bandwidth above 6 MHz allows accurate sampling of dynamic sensor outputs (vibration, acoustic, or strain-gage bridges) without external filtering.
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Medical Instrumentation
In medical instrumentation such as patient monitors and portable diagnostic devices, the AD7476BRTZ-REEL delivers 12-bit precision at 1 MSPS in a footprint small enough for wearable form factors. The 2.35 V to 5.25 V supply supports direct operation from common medical device battery rails. For ECG, SpO2, or temperature front ends where channel count is one to four, the AD7476 family offers sufficient dynamic range and low noise at this price point.
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Isolated Measurement Front Ends
The AD7476BRTZ-REEL's SPI-compatible serial interface simplifies isolation barrier design. A typical isolated front end places the ADC on the high-voltage side near the sensor, then routes the serial data, SCLK, and CS lines through a digital isolator (such as ADuM1411) to the low-voltage controller. This co-location minimizes analog signal path length and improves noise immunity, leveraging the ADC's tiny SOT-23-6 footprint for compact high-side layouts.
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추천 제품 요약
엔지니어링 참조 데이터: AD7476BRTZ-REEL — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AD7477BRTZ-REEL | AD7478BRTZ-REEL | AD7476BRTZ-R2 | AD7476BRTZ-REEL7 |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | SOT-23-6 (RT) | SOT-23-6 (RT) - same | SOT-23-6 (RT) - same | SOT-23-6 (RT) - same | SOT-23-6 (RT) - same |
| Resolution | 12-bit | 10-bit | 8-bit | 12-bit | 12-bit |
| Throughput | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS |
| Supply Voltage | 2.35 V to 5.25 V | 2.35 V to 5.25 V | 2.35 V to 5.25 V | 2.35 V to 5.25 V | 2.35 V to 5.25 V |
| Architecture | SAR | SAR | SAR | SAR | SAR |
| Interface | SPI serial | SPI serial | SPI serial | SPI serial | SPI serial |
| Channels | 1 | 1 | 1 | 1 | 1 |
주요 차별점
- Smallest 12-bit 1 MSPS SAR ADC package in the family (vs AD7476 in MSOP-8 variants)
- Wide supply range covers 3.3 V and 5 V systems (vs ADS7866 (TI))
- Family breadth covers 8/10/12-bit options in same footprint (vs Discrete non-family ADCs)
설계 노트
Place a 100 nF ceramic decoupling capacitor within 5 mm of the AVDD pin and a 10 uF bulk capacitor at the supply entry point. Per Analog Devices datasheet recommendations, AVDD should be driven from a low-noise LDO (such as ADP7104) rather than directly from a switching converter, especially in 12-bit precision applications. Add a ferrite bead if the supply source is noisy. A separate analog ground plane connected to the GND pin at a single point minimizes digital switching noise coupling into the analog input.
Drive the analog input with a low-impedance op-amp buffer (such as AD8628 or AD8031) capable of settling to 12-bit accuracy within the ADC acquisition time. The SAR ADC's input draws transient current spikes during acquisition, so a high-impedance source will cause gain error. Keep the input trace short and guarded with ground on both sides. For input signals above 100 kHz, add a small RC anti-aliasing filter (typically 1 kohm + 100 pF) before the ADC input.
Do not exceed the maximum supply voltage of 5.25 V on AVDD or allow the input voltage to exceed AVDD by more than 0.3 V; this can permanently damage the ESD diodes. Per the Analog Devices datasheet, ensure the REF pin is bypassed with at least 10 uF of effective capacitance to ground, not only 100 nF, or DNL/INL performance degrades. Do not toggle CS while SCLK is running without checking the timing diagram, or DOUT data may be corrupted.
규정 준수 정보
RoHS and REACH compliant per Analog Devices product page. Not AEC-Q100 qualified (industrial grade only). Lead-free and halogen-free per package markings.
