AD7476ABKSZ-REEL - 12-Bit 1 MSPS SAR ADC, SC-70-6 | Analog Devices
부품 번호: AD7476ABKSZ-REEL ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $3.45 | $3.45 |
| 10 | $3.1 | $31.00 |
| 100 | $2.75 | $275.00 |
| 500 | $2.42 | $1,210.00 |
| 1,000 | $2.18 | $2,180.00 |
AD7476ABKSZ-REEL 개요
An SAR ADC is a type of data converter that uses a successive-approximation register and an internal track-and-hold to digitize an analog input in a fixed number of clock cycles (typically one per N-bit cycle). As a sub-family of Nyquist-rate data converters, SAR ADCs sit between sigma-delta converters (higher resolution, lower speed) and flash ADCs (highest speed, lowest resolution) within the ADC taxonomy. ADCs are integrated circuits that bridge real-world analog signals to digital processors and microcontrollers across the broader mixed-signal and data-acquisition IC hierarchy.
Key features include very low power consumption, a high-speed SPI/QSPI/MICROWIRE-compatible serial interface, and an automatic power-down between conversions that drops current draw dramatically when the part idles between samples. The 6-lead SC-70 footprint makes it one of the smallest 1 MSPS ADCs available, enabling analog front-end placement next to sensors on space-constrained PCBAs.
The device uses a charge redistribution DAC architecture with an internal reference and a high-bandwidth input track-and-hold to deliver 12-bit linearity across the full input common-mode range. Because conversion is deterministic in time (no pipeline latency), the AD7476A is well suited to event-triggered sampling, multiplexed-channel sequencing, and motor-control feedback loops where deterministic group delay is required.
Typical applications include battery-powered portable instrumentation, hand-held multimeters and data loggers, transducer signal conditioning chains, isolated industrial sensors, optical-module monitoring, and general-purpose embedded analog front ends. Designers select this part specifically when PCB area, single-rail operation, and deterministic conversion latency are more important than the very highest absolute sampling rates.
When laying out a board, place the 0.1uF supply-decoupling capacitor as close as possible to the VDD pin, keep analog and digital grounds separated with a single-point stitch near the IC, and route the SCK, SDATA, and /CS digital traces away from the analog input net. Always drive /CS low before SCK edges and observe the tCONVERT timing budget for accurate 1 MSPS operation.
This page synthesizes ADI distributor pricing, drop-in alternatives, and SC-70 layout/design notes that go beyond the bare datasheet to give you a faster procurement and bring-up decision.
드롭인 대체품: AD7476ABKSZ-REEL — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD7476ABKSZ-REEL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7477ABKSZ-REEL
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
AD7478ABKSZ-REEL
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
AD7476AWYRTZ-REEL7
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
AD7476ABKSZ-REEL 최대 정격 & 전기적 특성
| 분해능 | 12 bits |
| Number of Inputs | 1 |
| Architecture | SAR (Successive Approximation) |
| Sample Rate (max) | 1 MSPS |
| Conversion Time | 800 ns (typ, 12-bit) |
| Supply Voltage (single) | 2.35 V to 5.25 V |
| Nominal Supply Voltage | 3 V (per Partstack listing) |
| Analog Input Type | Single-ended |
| Serial Interface | SPI / QSPI / MICROWIRE / DSP-compatible |
| 패키지 | SC-70-6 (BKSZ) |
| 핀 수 | 6 |
| 동작 온도 범위 | -40C to +85C |
| Temperature Grade | Industrial |
| 실장 유형 | Surface Mount |
| Terminal Form | GULL WING |
| RoHS 상태 | Compliant |
AD7476ABKSZ-REEL 핀 구성
| 핀 1 | VDD — Power supply input (2.35 V to 5.25 V). Place 0.1 uF decoupling close to this pin. |
| 핀 2 | VIN+ — Analog signal input (single-ended relative to GND). |
| 핀 3 | GND — Ground reference for both analog input and digital interface. |
| 핀 4 | /CS — Chip-select input (active low). Must be held low to enable SCK and SDATA activity. |
| 핀 5 | SDATA — Serial data output. Streams out the 12-bit conversion result, MSB first. |
| 핀 6 | SCK — Serial clock input. Data is clocked out on each falling SCK edge while /CS is low. |
일반적인 애플리케이션
AD7476ABKSZ-REEL 적합 용도: 6 애플리케이션s: Battery-Powered Portable Instrumentation, Industrial Transducer Signal Conditioning, Optical Module Monitoring, Motor-Control Current Sensing, General-Purpose Embedded Analog Front End, Medical Vital-Sign Acquisition.
Battery-Powered Portable Instrumentation
The AD7476ABKSZ-REEL is a strong fit for battery-powered portable instruments because its 1 MSPS throughput is delivered from a single 2.35 V to 5.25 V supply with sub-mW power draw between conversions. According to the AD7476A datasheet, automatic power-down between conversions drops consumption to a few microamps, allowing handheld multimeters and field data loggers to run for extended periods on a single coin-cell or two-AA pack. The SC-70-6 footprint places the ADC next to sensors without consuming board area.
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Industrial Transducer Signal Conditioning
The AD7476ABKSZ-REEL digitizes analog outputs from bridge sensors, thermocouples, RTDs, and 4-20 mA loops in compact industrial front ends. Its 1 MSPS throughput and SPI-compatible serial interface allow it to feed microcontrollers and isolated DSPs at rates sufficient for vibration, pressure, and process-control loops. The industrial -40C to +85C rating and gull-wing SC-70 package ensure robust soldering and stable operation on dense PLC analog input boards.
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Optical Module Monitoring
In optical transceivers and laser modules, the AD7476ABKSZ-REEL digitizes photodiode currents, TEC voltages, and bias feedback in a minimum of board area. Because its conversion latency is deterministic, MPU firmware can sample on a fixed schedule and close a feedback loop to maintain optical output power without pipelining artifacts. The single-rail operation and sub-1 uA power-down currents match the heat-constrained environment inside an SFP/QSFP-style module.
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Motor-Control Current Sensing
Brushless-DC and stepper motor drives need a fast, deterministic ADC to sample phase current and report back to the controller every PWM cycle. The AD7476ABKSZ-REEL's SAR architecture samples in 800 ns with no pipeline delay, meaning the MCU can compute the next duty cycle in the same PWM period. Its 12-bit resolution across a 2.35 V to 5.25 V common-mode range resolves the shunt resistor drop with sufficient precision for FOC and torque-ripple control.
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General-Purpose Embedded Analog Front End
A general-purpose analog front end on a microcontroller board can place the AD7476ABKSZ-REEL on a single SC-70-6 land pattern to add a 1 MSPS 12-bit analog channel at minimal cost in board area and BOM. Its standard SPI/QSPI/MICROWIRE-compatible interface is supported by virtually every Cortex-M, AVR, MSP430, and PIC MCU's hardware SPI block with no glue logic required. This makes the part a go-to 'always-on-board' ADC for makers, prototypes, and production designs needing one fast analog channel.
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Medical Vital-Sign Acquisition
Although full medical certification is the integrator's responsibility, the AD7476ABKSZ-REEL is well-suited to digitizing analog front ends for pulse oximetry, ECG lead-off detection, and respiration-rate transducers in low-power patient-monitoring peripherals. Its 12-bit resolution across a 2.35 V to 5.25 V input span gives adequate dynamic range for biosignal amplitudes after instrumentation-amp gain stages, while the 1 MSPS throughput supports oversampling techniques for noise reduction. Designers building Class A and B patient-adjacent devices use this part to keep the analog section small and the supply chain flexible.
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추천 제품 요약
엔지니어링 참조 데이터: AD7476ABKSZ-REEL — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AD7476ABKSZ-REEL7 | AD7477ABKSZ-REEL | AD7478ABKSZ-REEL | AD7476AWYRTZ-REEL7 |
|---|---|---|---|---|---|
| Package | SC-70-6 (BKSZ) | SC-70-6 - same | SC-70-6 - same | SC-70-6 - same | SC-70-6 - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 12 bits | 12 bits | 10 bits | 8 bits | 12 bits |
| Sample Rate (max) | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS |
| Supply Voltage Range | 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 |
| Serial Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE |
| Automotive Grade | No | No | No | No | Yes (AEC-Q100) |
| Reel Quantity | Standard (REEL) | 7-inch reel alternative (REEL7) | Standard (REEL) | Standard (REEL) | 7-inch reel automotive (REEL7) |
주요 차별점
- Smallest form factor 1 MSPS 12-bit ADC in ADI's portfolio (vs AD7476ABKSZ-REEL7)
- Higher resolution than siblings in the same SC-70-6 family (vs AD7477ABKSZ-REEL)
- Deterministic SAR conversion (no pipeline latency) (vs AD7265BCPZ-REEL)
- Power-down current drop between conversions enables battery operation (vs AD7476AWYRTZ-REEL7)
설계 노트
Place a 0.1 uF ceramic decoupling capacitor as close as possible to the VDD pin and, if the ADC is more than 25 mm from the source supply, add a 1 uF to 10 uF bulk capacitor adjacent to the local regulator. The AD7476A family draws peak current during conversion, so a poorly decoupled rail introduces mid-band noise on the digital data outputs. Estimate: the part's logic-level SCK bursts can pull tens of milliamps for a few cycles, so the decoupling network must respond in <100 ns.
Keep the analog input (VIN+, pin 2) trace short and parallel-routed to ground (pin 3) on the top layer to minimize loop area. Route the SCK, /CS, and SDATA digital traces on the opposite side or an inner layer and stitch a digital-only ground plane under them. A single-point star ground should connect the analog and digital ground planes right at pin 3 of the SC-70-6 to prevent digital return currents from corrupting the analog input.
Do not leave /CS floating - it must be driven by the controlling MCU GPIO. Hold /CS high when no conversion is active to keep the SAR core in power-down. Provide at least one dummy SCK edge with /CS high before the first conversion to ensure the SDATA driver is in the correct three-state mode. Finally, wait the tCONVERT window (typ 800 ns at 12 bits) before clocking SDATA, otherwise you will read bit noise from the still-running SAR capacitors.
Because the SC-70-6 is a tiny leadless-style package, series resistance in the SCK and SDATA traces can collapse the rising edge of SCK and cause bit-shift errors at the highest throughputs. Keep SCK, /CS, and SDATA impedance controlled (target 50 ohm) and length-matched to within 1 cm. Place a small 33 ohm source resistor at the SCK driver if your MCU pin is especially fast, to damp reflections from the ADC pin capacitance.
규정 준수 정보
RoHS compliant per ADI product page. Industrial -40C to +85C operating range. For AEC-Q100 grade, choose the AD7476AWYRTZ-REEL7 variant.
