AD7876BR-REEL - 12-Bit 100kHz SAR ADC, 24-SOIC | Analog Devices
부품 번호: AD7876BR-REEL ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $17.2 | $172.00 |
| 100 | $15.4 | $1,540.00 |
| 500 | $13.85 | $6,925.00 |
| 1,000 | $12.3 | $12,300.00 |
| 3,000 | $10.95 | $32,850.00 |
AD7876BR-REEL 개요
An SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter that uses a binary search algorithm and an internal capacitive DAC to convert an analog input voltage into a digital code over a fixed number of clock cycles. The AD7876 belongs to the broader data-converter hierarchy: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor. Built on Analog Devices' LC2MOS process, it integrates the entire signal path from analog input to digital word in a single IC, eliminating the external components required by older discrete ADC designs.
Key features include a 100 kHz throughput rate, 2 microsecond track-and-hold acquisition time, 8 microsecond ADC conversion time, an on-chip buried-Zener reference laser-trimmed for accuracy, and 72 dB signal-to-noise ratio. The device supports bipolar input ranges of +/-5 V or +/-10 V via the AD7876BR (BR suffix) and offers parallel, byte, and serial interface modes for flexible microcontroller or DSP connectivity. Operating from a single +5 V supply, it consumes approximately 70 mW of power.
The AD7876 uses a charge-redistribution switched-capacitor DAC architecture combined with a precision comparator and SAR logic to perform successive approximation. The internal reference and clock eliminate two of the most critical external components in ADC subsystems, reducing board area and improving long-term stability. Dynamic performance is specified for DSP users with SNR and harmonic distortion figures that make it suitable for both DC measurement and AC signal acquisition applications.
Typical applications include industrial process control and data acquisition, motor control feedback loops, instrumentation and test equipment, medical instrumentation signal conditioning, and spectrum analysis front-ends. The wide input range and integrated reference make it well suited for industrial 4-20 mA loop digitization with appropriate signal conditioning.
When designing with this device, decouple the +5 V supply with a 10 uF tantalum and 0.1 uF ceramic capacitor placed close to the supply pin. The analog input drive amplifier must settle within the 2 us acquisition window to avoid conversion errors. For best noise performance, keep digital and analog grounds separated and joined at a single star point near the ADC.
This page synthesizes distributor pricing from 6 sources, drop-in alternatives from the Analog Devices AD787x family and pin-compatible cross-brand parts, and practical design notes not consolidated on any single datasheet or distributor page.
드롭인 대체품: AD7876BR-REEL — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: AD7876BR-REEL (동일 폼 팩터 및 풋프린트) — 차이점: Architecture, On-Chip Reference, Package, Track-and-Hold Acquisition Time.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD7876BR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7876BR-REEL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7876CRZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7876CRZ-REEL7
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
AD7875LPZ-REEL
✅ 드롭인✓ 재고 있음
$15.68 / 개
데이터시트 보기 →AD7876BR-REEL 최대 정격 & 전기적 특성
| Number of Bits | 12 |
| 샘플링 속도 | 100 kSPS |
| Number of Inputs | 1 |
| Input Type | Single-Ended (bipolar +/-5 V or +/-10 V) |
| Data Interface | Parallel, Byte, Serial |
| Architecture | SAR (Successive Approximation Register) |
| Track-and-Hold Acquisition Time | 2 us |
| ADC Conversion Time | 8 us |
| On-Chip Reference | Yes (laser-trimmed buried Zener) |
| 공급 전압 | +5 V |
| Power Dissipation | 70 mW (typical) |
| Signal-to-Noise Ratio | 72 dB |
| 패키지 | 24-SOIC (0.295 in / 7.50 mm width) |
| 실장 유형 | Surface Mount |
| Packaging | Tape & Reel (REEL suffix) |
| RoHS 상태 | Compliant |
AD7876BR-REEL 핀 구성
| 핀 1 | VREF — Reference voltage output (decoupling) |
| 핀 2 | AGND — Analog ground |
| 핀 3 | AIN — Analog input |
| 핀 4 | R1 — Input range scaling resistor pin 1 |
| 핀 5 | R2 — Input range scaling resistor pin 2 |
| 핀 6 | REF IN — Reference input (decoupling) |
| 핀 7 | VDD — +5 V supply |
| 핀 8 | DGND — Digital ground |
| 핀 9 | CLK — Clock input |
| 핀 10 | CONVST — Conversion start (active low) |
| 핀 11 | BUSY — Busy output (active high during conversion) |
| 핀 12 | CS — Chip select (active low) |
| 핀 13 | RD — Read input (active low) |
| 핀 14 | DB11 — Data output bit 11 (MSB) |
| 핀 15 | DB10 — Data output bit 10 |
| 핀 16 | DB9 — Data output bit 9 |
| 핀 17 | DB8 — Data output bit 8 |
| 핀 18 | DB7 — Data output bit 7 |
| 핀 19 | DB6 — Data output bit 6 |
| 핀 20 | DB5 — Data output bit 5 |
| 핀 21 | DB4 — Data output bit 4 |
| 핀 22 | DB3 — Data output bit 3 |
| 핀 23 | DB2 — Data output bit 2 |
| 핀 24 | DB1 — Data output bit 1 (LSB) |
일반적인 애플리케이션
AD7876BR-REEL 적합 용도: 7 애플리케이션s: Industrial Process Control Data Acquisition, Motor Control Feedback Loops, Instrumentation and Test Equipment, Medical Instrumentation Signal Acquisition, Spectrum Analysis and DSP Front-End, Audio and Communication Signal Conditioning, Battery Monitoring and Power Management.
Industrial Process Control Data Acquisition
The AD7876BR-REEL's 12-bit resolution and 100 kSPS throughput suit it for industrial process control loops where sensor signals must be digitized at high speed. The +/-10 V bipolar input range via the BR scaling network accepts 4-20 mA loop signals after a sense resistor, while the 72 dB SNR preserves measurement accuracy for closed-loop control. The on-chip laser-trimmed reference eliminates drift concerns in 24/7 plant operation.
추천
Motor Control Feedback Loops
Brushless DC and AC servo motor controllers need fast, accurate phase current and position feedback digitization. The AD7876BR-REEL's 2 us track-and-hold and 100 kSPS rate allow current-sense amplifier outputs to be sampled synchronously with PWM switching. The parallel interface provides the low-latency data transfer required for field-oriented control (FOC) algorithms running on DSPs and microcontrollers.
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Instrumentation and Test Equipment
Digital multimeters, oscilloscope front-ends, and bench-top data loggers benefit from the AD7876BR-REEL's integrated architecture and flexible interface. The on-chip reference simplifies calibration, while the parallel/byte/serial interface selection accommodates legacy microcontroller displays and modern DSP back-ends. The 12-bit accuracy is sufficient for general-purpose measurement; for higher precision, the AD786x 14-bit family is recommended.
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Medical Instrumentation Signal Acquisition
Patient monitoring and diagnostic equipment digitize low-frequency biosignals at moderate sample rates. The AD7876BR-REEL's 100 kSPS is overkill for ECG (typically 500 Hz) but useful for high-bandwidth modalities like ultrasound pre-beamforming and evoked-potential capture. The integrated reference and small SOIC footprint simplify the compact PCB layouts required for portable medical devices.
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Spectrum Analysis and DSP Front-End
Wideband spectrum analyzers and software-defined radio front-ends digitize IF signals at high sample rates for FFT processing. The AD7870 and AD7875 are the AD7876 family members specifically specified for dynamic performance (SNR, harmonic distortion, intermodulation distortion) required by DSP users. The AD7876BR-REEL can serve these applications when dynamic specs are not the primary concern, such as in calibration or telemetry channels.
추천
Audio and Communication Signal Conditioning
Audio mixing consoles, communications receivers, and base-band signal processors use moderate-resolution ADCs in the audio band. The AD7876BR-REEL's 72 dB SNR provides sufficient dynamic range for voice-band digitization, and its parallel interface can stream samples directly into a DSP for real-time filtering. While not a high-fidelity audio ADC, it is well suited for industrial audio and intercom systems where cost is paramount.
추천
Battery Monitoring and Power Management
Battery management systems in UPS, telecom, and electric-vehicle applications monitor cell voltages, pack current, and temperature. The AD7876BR-REEL's +/-10 V input range accepts voltages from multi-cell battery stacks via simple resistor dividers, and the 100 kSPS rate enables simultaneous monitoring of multiple cells through an external multiplexer. The low 70 mW power consumption from a single +5 V rail suits thermally-constrained battery packs.
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추천 제품 요약
엔지니어링 참조 데이터: AD7876BR-REEL — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AD7876BR | AD7876BR-REEL7 | AD7876CRZ | AD7876CRZ-REEL7 | AD7875LPZ-REEL |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 24-SOIC wide (7.50 mm) | 24-SOIC wide - same | 24-SOIC wide - same | 24-SOIC wide - same | 24-SOIC wide - same | 24-LCCC variant |
| Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit |
| Sampling Rate | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS |
| Input Range (Bipolar) | +/-5 V or +/-10 V (BR scaling) | +/-5 V or +/-10 V (BR scaling) | +/-5 V or +/-10 V (BR scaling) | Commercial grade scaling (differs from BR) | Commercial grade scaling (differs from BR) | AD7875 family bipolar scaling |
| On-Chip Reference | Yes (laser-trimmed) | Yes | Yes | Yes | Yes | Yes |
| Data Interface | Parallel/Byte/Serial | Parallel/Byte/Serial | Parallel/Byte/Serial | Parallel/Byte/Serial | Parallel/Byte/Serial | Parallel/Byte/Serial |
| Packaging Form | Tape & Reel (13-inch) | Tube | Tape & Reel (7-inch) | Tube | Tape & Reel (7-inch) | Tape & Reel |
주요 차별점
- Same family SOIC-24 footprint enables BOM flexibility (vs AD7876BR)
- Standard 13-inch reel for high-volume manufacturing (vs AD7876BR-REEL7)
- BR-suffix bipolar input range scaling (vs AD7876CRZ)
설계 노트
Estimated: Decouple the AD7876BR-REEL's +5 V supply with a 10 uF tantalum bulk capacitor and a 0.1 uF ceramic capacitor placed within 5 mm of the VDD pin. The ADC draws approximately 14 mA (70 mW / 5 V) plus transient currents during conversion; poor decoupling causes reference noise that couples into the conversion result. For best performance, use a linear regulator for the analog supply rather than a switching converter.
Keep analog and digital grounds separated on the PCB and join them at a single star-point near the ADC's AGND pin. The wide-body SOIC package provides adequate thermal dissipation at 70 mW, but the exposed lead frame should be soldered to a ground pour for both thermal and EMI reasons. Route digital outputs (DB1-DB11) away from the analog input traces to minimize digital-to-analog crosstalk.
The drive amplifier at the AIN pin must settle to 12-bit accuracy within the 2 us acquisition window. An op-amp with insufficient slew rate or bandwidth causes gain errors and noise pickup. Verify that the input amplifier's settling time is at least 4x faster than the acquisition window. Also note that the BR-suffix scaling resistors set the +/-5 V or +/-10 V range; omitting them or selecting wrong values causes input-range errors. Reference warmup time after power-on is required before accurate conversions.
규정 준수 정보
RoHS compliant per Analog Devices product page. REACH compliant per manufacturer datasheet. No AEC-Q100 automotive qualification - choose AD7862AR-10REEL7 automotive variant for vehicle applications. Halogen-free per manufacturer datasheet.
