AD7450ARZ-REEL - 12-Bit 1MSPS SAR ADC Differential Input | Analog Devices
부품 번호: AD7450ARZ-REEL ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $6.85 | $6.85 |
| 10 | $6.2 | $62.00 |
| 100 | $5.45 | $545.00 |
| 500 | $4.95 | $2,475.00 |
| 1,000 | $4.5 | $4,500.00 |
AD7450ARZ-REEL 개요
A SAR ADC is a successive-approximation analog-to-digital converter that uses a binary-search algorithm and a single high-precision comparator to digitize analog signals. SAR ADCs sit in the broader signal chain hierarchy of data converters -> ADC -> Nyquist-rate converters -> successive-approximation ADCs, and are valued for their deterministic latency, low power, and excellent DC accuracy.
Key features include a fully differential analog input, pseudo-differential or true-differential sampling modes, throughput rates of 1 MSPS at VDD=5V or 833 kSPS at VDD=3V, very low power consumption (typically 4 mW at 3 V, 9 mW at 5 V), a high-speed serial SPI/QSPI/MICROWIRE-compatible interface, and an industrial operating temperature range of -40 C to +85 C. The differential input stage and small package make it suited to dense precision designs.
Internally the AD7450 uses a charge-redistribution DAC array with a sample-and-hold front-end that is fully differential, achieving excellent common-mode noise rejection and supporting bipolar input ranges when paired with a true bipolar reference. The serial interface is simple and glueless to most modern microcontrollers and DSPs.
Typical applications include industrial process control, data acquisition systems, portable battery-powered instrumentation, motor control feedback loops, and precision sensor signal conditioning. The wide input voltage compliance (-2 V to +2 V at 5 V supply) supports both single-ended sensor bridges and differential signal chains.
When designing with the AD7450ARZ-REEL, place the 0.1 uF + 10 uF decoupling capacitors as close to the AVDD pin as possible, route the differential inputs as a matched pair, and verify that the VREF source can supply the dynamic charge currents demanded by the SAR conversion.
This page synthesizes ADI datasheet specifications, distributor pricing as of 2026-10-12, and pin-compatible drop-in alternatives from the same ADI family and competing manufacturers - information not available on any single distributor or manufacturer page.
드롭인 대체품: AD7450ARZ-REEL — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD7450ARZ-REEL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7450BRZ-REEL
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7450KRZ-16-REEL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7272ARUZ-REEL
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7373ARUZ-REEL
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS7818P
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7450ARZ-REEL 최대 정격 & 전기적 특성
| 분해능 | 12 bits |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 |
| Analog Input Type | Differential (Pseudo-Differential option) |
| Differential Input Voltage Range | -2 V to +2 V (VREF = 2.5 V, VDD = 5 V) |
| Sample Rate (Throughput) | 1 MSPS @ VDD=5V; 833 kSPS @ VDD=3V |
| Supply Voltage (VDD) | 2.7 V to 5.25 V (single supply) |
| Reference Voltage (VREF) | 100 mV to 3.5 V (external) |
| Power Dissipation (typ) | 4 mW @ 3 V; 9 mW @ 5 V |
| Digital Interface | SPI / QSPI / MICROWIRE-compatible serial |
| 동작 온도 | -40 C to +85 C (Industrial) |
| Package / Mounting | 8-pin SOIC (MO-187AA) / Surface Mount |
| Packaging | Tape & Reel (REEL = 2,500 pcs; REEL7 = 1,000 pcs) |
| MSL 레벨 | 1 (unlimited floor life) |
| RoHS Compliance | Compliant |
| Screening Level | Industrial |
| 핀 수 | 8 |
AD7450ARZ-REEL 핀 구성
| 핀 1 | VDD — Analog and digital power supply, 2.7 V to 5.25 V |
| 핀 2 | VREF — External reference voltage input, 100 mV to 3.5 V |
| 핀 3 | AGND — Analog ground reference |
| 핀 4 | VIN+ — Differential analog input positive |
| 핀 5 | VIN- — Differential analog input negative |
| 핀 6 | GND — Digital ground reference |
| 핀 7 | DOUT — Serial data output (SPI MOSI from ADC) |
| 핀 8 | SCLK — Serial clock input |
일반적인 애플리케이션
AD7450ARZ-REEL 적합 용도: 6 애플리케이션s: Industrial Process Control Data Acquisition, Portable Battery-Powered Instrumentation, Motor Control Feedback Loops, Precision Sensor Signal Conditioning, Medical Monitoring Devices, Data Acquisition Systems (DAQ).
Industrial Process Control Data Acquisition
The AD7450ARZ-REEL's 1 MSPS throughput at 5 V and 12-bit resolution make it well suited for industrial process control systems digitizing 4-20 mA loop voltages and bridge sensor outputs. Its fully differential input rejects common-mode noise from motor drives and switching converters typically found in factory floors. With 9 mW typical power dissipation at 5 V, it fits distributed I/O modules without thermal concerns. The SPI-compatible serial interface connects directly to PLC microcontrollers and ARM Cortex-M industrial MCUs without glue logic. The industrial -40 C to +85 C temperature rating supports outdoor panel installations. Compared to a 24-bit sigma-delta ADC, the SAR architecture provides deterministic single-cycle latency, ideal for closed-loop proportional-integral control where conversion delay must be predictable. Place the device on a quiet analog ground island with separate analog and digital supplies for best noise performance in mixed-signal process control boards.
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Portable Battery-Powered Instrumentation
At 4 mW typical power consumption from a 3 V supply, the AD7450ARZ-REEL is excellent for portable handheld instruments like digital multimeters, portable oscilloscope front-ends, and field data loggers where battery life is critical. The 833 kSPS throughput at 3 V supports real-time signal capture without draining the battery. Its serial interface allows direct connection to low-pin-count microcontrollers, minimizing BOM cost and PCB area. The 8-pin SOIC package fits compact handheld enclosures where board real estate is at a premium. The wide reference voltage range from 100 mV to 3.5 V supports low-gain signal conditioning for thermocouples, RTDs, and strain gauges. Compared to higher-speed ADCs, the AD7450 strikes a balance between power and throughput - ideal when the application demands sub-1 mA quiescent current from a single Li-ion cell or two AA batteries in series.
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Motor Control Feedback Loops
The AD7450ARZ-REEL's 1 MSPS conversion rate and deterministic SAR latency make it ideal for digitizing current and voltage feedback signals in BLDC and stepper motor control loops. Its fully differential input rejects switching noise from the half-bridge FET drivers, critical for accurate phase current sensing. The single 5 V supply aligns with the digital rail of typical motor controller MCUs, simplifying board design. With 12-bit resolution, it provides sufficient dynamic range for torque control and overcurrent protection circuits. The serial interface requires only two MCU pins (SCLK + DOUT), leaving more GPIO available for PWM, encoder, and fault inputs. Compared to integrated motor controller ASICs, a discrete MCU plus AD7450 architecture offers more flexibility for tuning the control loop and adding custom features. The -40 C to +85 C industrial rating covers most outdoor and automotive-adjacent motor drive applications.
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Precision Sensor Signal Conditioning
Strain gauge, load cell, and pressure sensor signals in the millivolt domain require a low-noise differential ADC - and the AD7450ARZ-REEL with its 100 mV minimum VREF and -2 V to +2 V differential input range is well matched to these applications. The differential architecture rejects ground-loop noise common in industrial sensor wiring. With 12-bit resolution and 1 MSPS throughput, it provides ample dynamic range for bridge-based sensors that produce 1-3 mV/V output. The serial SPI-compatible output allows direct connection to wireless sensor node MCUs and low-power DSPs. Compared to 24-bit delta-sigma ADCs intended for the same role, the SAR AD7450 offers much lower latency and simpler digital filtering. Add an external precision op-amp (e.g. AD8628) in front of the ADC for high-impedance sensor buffering and gain scaling.
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Medical Monitoring Devices
The AD7450ARZ-REEL fits medical monitoring front-ends such as portable pulse oximeters, blood pressure monitors, and patient temperature measurement systems. Its 9 mW power dissipation at 5 V extends battery life in ambulatory devices. The 12-bit resolution is sufficient for heart rate, SpO2, and body temperature signal acquisition when paired with appropriate analog front-end signal conditioning. The SPI interface is compatible with low-power medical MCUs from vendors like Microchip and ST. Note that this is not an AEC-Q100 qualified device, so it is suited for clinical and home-use medical designs but not for in-vehicle emergency response equipment. Compared to dedicated medical ADCs, the AD7450 provides a flexible general-purpose alternative for cost-sensitive medical designs. Always add proper medical-grade isolation (IEC 60601) when interfacing to patient-connected electrodes.
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Data Acquisition Systems (DAQ)
Multi-channel data acquisition systems for laboratory instruments, vibration monitoring, and audio analysis benefit from the AD7450ARZ-REEL's 1 MSPS throughput and SPI interface. Multiple AD7450 devices can share a single SPI bus using individual chip-select lines, allowing high channel count without bus contention. The 12-bit resolution covers most general-purpose DAQ requirements; choose the AD7450KRZ-16 drop-in alternative if more dynamic range is needed. The differential input stage is critical for rejecting 50/60 Hz power line noise that contaminates single-ended measurements. Compared to integrated multi-channel ADCs, using discrete AD7450s per channel provides galvanic isolation flexibility and per-channel gain staging. The 8-pin SOIC package is easy to place on the DAQ analog input section with proper guard rings and ground plane partitioning for optimum noise performance.
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추천 제품 요약
엔지니어링 참조 데이터: AD7450ARZ-REEL — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AD7450ARZ-REEL7 | AD7450BRZ-REEL | AD7450KRZ-16-REEL7 | AD7272ARUZ-REEL | ADS7818P |
|---|---|---|---|---|---|---|
| Package | SOIC-8 (MO-187AA) | SOIC-8 (MO-187AA) | SOIC-8 (MO-187AA) | SOIC-8 (MO-187AA) | SOIC-8 (MO-187AA) | SOIC-8 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Resolution | 12 bits | 12 bits | 12 bits | 16 bits | 12 bits | 12 bits |
| Sample Rate | 1 MSPS @ 5V / 833 kSPS @ 3V | 1 MSPS | 1 MSPS | 1 MSPS (16-bit) | 3 MSPS | 200 kSPS |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.35 V to 5.25 V | 2.0 V to 5.25 V |
| Power Dissipation | 4 mW @ 3V / 9 mW @ 5V | 4 mW / 9 mW | 4 mW / 9 mW | 8 mW / 15 mW | 6 mW / 12 mW | 1.5 mW @ 5V |
| Differential Input Range | -2 V to +2 V (VREF=2.5 V) | -2 V to +2 V | -2 V to +2 V | -2 V to +2 V | 0 V to VREF | 0 V to VREF |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | -40 C to +85 C (extended) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Interface | SPI / QSPI / MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI | SPI/QSPI/MICROWIO |
| RoHS Compliant | Yes | Yes | Yes | Yes | Yes | Yes |
주요 차별점
- Fully differential analog input with -2 V to +2 V range (vs AD7272ARUZ-REEL)
- 12-bit 1 MSPS with 9 mW power at 5 V (vs ADS7818P)
- Compact 8-pin SOIC with SPI-compatible serial interface (vs AD7450KRZ-16-REEL7)
설계 노트
Decouple the AD7450ARZ-REEL's VDD pin with a 0.1 uF X7R ceramic capacitor placed within 5 mm of the pin and a bulk 10 uF tantalum or ceramic capacitor on the analog supply rail. Use a low-noise LDO such as ADP7102 or ADP150 to power the analog rail; switching regulators introduce ripple that appears directly in the ADC's output codes via PSRR limitations. Keep analog and digital grounds separate under the chip and join them at a single point near the ADC's GND pin to avoid ground-loop noise coupling into the differential input.
Route the differential analog pair VIN+ and VIN- as a matched length pair with characteristic impedance matched to the source impedance. Place the device on a guarded analog ground plane with the analog input traces surrounded by a guard ring tied to AGND. Keep digital signals (SCLK, DOUT) routed on the opposite side of the board from analog input traces to minimize capacitive coupling. Add a 4.7 uF ceramic capacitor as close as possible to the VREF pin since the SAR architecture injects charge transients into the reference during conversion - high-frequency decoupling is mandatory for 12-bit linearity.
Do not exceed VDD+0.3 V on any analog input pin; the ESD diodes will forward-conduct and degrade linearity. Avoid driving the analog input before VDD is established - this can latch-up the input ESD clamps. The SCLK signal must be clean - any ringing or overshoot above VDD+0.5 V can damage the digital input. When reading the serial data, ensure the MCU samples DOUT on the correct clock edge per the AD7450 datasheet timing diagram; sampling on the wrong edge causes bit errors. For optimum linearity, warm-up the reference voltage for at least 1 ms before initiating conversion.
규정 준수 정보
Z suffix indicates RoHS-compliant lead-free finish. Industrial screening level -40 C to +85 C. Not AEC-Q100 qualified; for automotive designs use AEC-Q100 qualified ADI ADC variants.
