AD7827BRZ-REEL - 8-Bit 1MSPS Serial ADC w/ 2.5V Ref | Analog Devices
부품 번호: AD7827BRZ-REEL ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.1 | $510.00 |
| 500 | $4.4 | $2,200.00 |
| 1,000 | $3.85 | $3,850.00 |
AD7827BRZ-REEL 개요
An analog-to-digital converter is an integrated circuit that converts a continuous-time, continuous-amplitude analog signal into a discrete-time, discrete-amplitude digital representation suitable for processing by microcontrollers, DSPs, or FPGAs. ADCs sit at the boundary between the analog and digital domains within a mixed-signal data acquisition signal chain: sensor -> signal conditioning -> ADC -> processor. By category, the AD7827BRZ-REEL belongs to successive-approximation/half-flash ADCs, which in turn fall under the broader data-converter family, and the wider analog and mixed-signal IC category, ultimately within power management and signal chain semiconductors.
Key differentiators include 1 MSPS guaranteed throughput, 200 ns acquisition time, an integrated reference that eliminates external components, and extremely low power consumption when powered down between conversions. The serial interface minimizes pin count and simplifies PCB routing in space-constrained designs.
Architecturally, the half-flash topology uses two parallel 4-bit flash sub-ADCs and an internal DAC to deliver an 8-bit result in just 420 ns, doubling the speed of a basic successive-approximation register (SAR) ADC while maintaining low power. Compared with full-flash 8-bit converters, the half-flash design reduces comparator count, die area, and power dissipation.
Typical applications include data acquisition systems, system monitoring and metering, portable or battery-powered instrumentation, optical modules, and DSP front-end signal conditioning. The wide 3 V to 5 V supply range supports both legacy 5 V microcontroller systems and modern low-voltage 3.3 V designs.
When designing with this part, place a 0.1 uF decoupling capacitor close to the AVDD pin and follow Analog Devices' recommended PCB layout for high-speed sampling converters to minimize kickback noise and maintain linearity. The CONVST pin doubles as the power-down control, so gate it with the host's general-purpose I/O after configuring the serial clock.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes beyond the manufacturer datasheet for fast engineering evaluation. (Supplying the AD7827 datasheet PDF on Analog's product page provides the authoritative specification set.)
드롭인 대체품: AD7827BRZ-REEL — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: AD7827BRZ-REEL (동일 폼 팩터 및 풋프린트) — 차이점: Packaging, On-Chip Reference, Architecture, Data Interface, Package.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD7827BRZ
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$4.55 / 개
데이터시트 보기 →AD7827BRZ-REEL7
✅ 드롭인✓ 재고 있음
$2.91 / 개
데이터시트 보기 →AD7827BRZ-REEL 최대 정격 & 전기적 특성
| 분해능 | 8 bits |
| Sampling Rate (Throughput) | 1 MSPS |
| Number of Channels | 1 single-ended input |
| Number of Converters | 1 (half-flash) |
| Conversion Time | 420 ns |
| Acquisition Time | 200 ns |
| Architecture | Half-Flash ADC with track-and-hold |
| On-Chip Reference | 2.5 V, 2% tolerance |
| 공급 전압 | 3 V or 5 V single supply |
| Data Interface | DSP-compatible serial interface |
| Input Type | Single-ended analog input |
| 패키지 | 8-SOIC (0.154", 3.90 mm width) |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
| Packaging | Tape and Reel |
AD7827BRZ-REEL 핀 구성
| 핀 1 | VDD — Analog supply voltage (3 V to 5 V) |
| 핀 2 | GND — Analog ground |
| 핀 3 | REF — Reference voltage input/output (internal 2.5 V) |
| 핀 4 | VIN — Analog input (single-ended) |
| 핀 5 | GND — Analog ground (digital ground common to analog) |
| 핀 6 | CONVST — Conversion start / power-down control input |
| 핀 7 | SCLK — Serial clock input |
| 핀 8 | SDATA — Serial data output |
일반적인 애플리케이션
AD7827BRZ-REEL 적합 용도: 6 애플리케이션s: Data Acquisition Systems, System Monitoring and Metering, Portable Battery-Powered Instrumentation, DSP Front-End Signal Sampling, Optical Module Monitoring, Process Control Feedback Loops.
Data Acquisition Systems
The AD7827BRZ-REEL targets general-purpose data acquisition front ends where 1 MSPS throughput across 8 bits is sufficient. With a 420 ns conversion time and 200 ns acquisition time, it can sample at full rate on each CONVST edge and stream 8-bit results over a DSP-compatible serial link. The internal 2.5 V reference eliminates external components and reduces PCB area, while the SOIC-8 footprint is straightforward for four-layer boards. Battery management ICs often generate supply rails that feed the ADC's AVDD; pair a ferrite bead with a 0.1 uF decoupling capacitor at the AVDD pin to keep kickback noise out of the analog input.
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System Monitoring and Metering
Industrial sensors and meter panels benefit from the AD7827BRZ-REEL's single 3 V to 5 V supply and integrated track-and-hold. The half-flash architecture delivers 8-bit snapshots of voltages, currents, or temperatures with each CONVST event, allowing an MCU to digitize dozens of channels via an external mux. The CONVST-controlled power-down lets the host place the ADC in a low-current idle state between samples, which is critical for battery-backed metering equipment running from a small cell. Pair the ADC with a low-dropout regulator from the LD39150 family to derive clean AVDD from noisy 24 V instrumentation rails.
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Portable Battery-Powered Instrumentation
Handheld scopes, dataloggers, and field instruments use the AD7827BRZ-REEL for low-power 8-bit capture of waveforms, sensor reads, or analog triggers. The CONVST pin doubles as a power-down control, so an MCU can enable conversions only when needed and drop into sub-mA standby between events. The serial interface requires just three wires - SCLK, SDATA, and CONVST - leaving the MCU's other pins free for user I/O. A simple voltage reference such as TL431ACDBZR can supply AVDD if a precise rail already exists; otherwise the internal 2.5 V reference is good enough for general-purpose instrumentation tasks.
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DSP Front-End Signal Sampling
The AD7827BRZ-REEL's DSP-compatible serial interface maps directly to the synchronous serial ports of common DSPs and microcontrollers, making it ideal as the analog front end for high-throughput digital signal processing. With 1 MSPS throughput and 8-bit resolution, it can digitize control loops, baseband IF signals, vibration data, or motor-control feedback at the full Nyquist rate. The half-flash architecture keeps latency low - under 1 us from CONVST edge to data ready - which suits fast control applications such as digital power converters and inverter feedback. Pair the ADC with a digital isolator to break ground loops between the high-voltage power stage and the digital controller.
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Optical Module Monitoring
Optical transceivers and laser modules require a compact, low-power ADC for monitoring transmit power, temperature, bias currents, and received signal strength - exactly the type of slow but steady analog telemetry suitable for the AD7827BRZ-REEL. Its single 3 V to 5 V supply matches the SFP module rails, and the small 8-SOIC footprint fits inside the cramped SFP cage. Using the CONVST power-down feature allows the host DSP to wake the ADC only for periodic telemetry reads, extending module power budget. The integrated track-and-hold eliminates the need for an external buffer amplifier on each monitor pin.
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Process Control Feedback Loops
Industrial PLC, motor drive, and process control systems need fast, deterministic ADC conversion for closed-loop feedback. The AD7827BRZ-REEL delivers 8-bit, 1 MSPS conversion with a fixed 420 ns conversion time that simplifies loop-rate budgeting. The SOIC-8 package tolerates the -40 C to +85 C industrial temperature range and is easily placed next to current-sense amplifiers and isolated gate drivers. The DSP-compatible serial output can be DMA'd directly into controller memory, freeing the CPU to handle inner-loop math without jitter. Place a TVS diode such as SMAJ5.0A on the analog input to clamp transients from inductive loads.
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추천 제품 요약
엔지니어링 참조 데이터: AD7827BRZ-REEL — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AD7827BRZ | AD7827BRZ-REEL7 | AD7478AARMZ-REEL7 |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-SOIC (BRZ) | 8-SOIC (BRZ) - same | 8-SOIC (BRZ) - same | MSOP-8 (RM-8) - different |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits |
| Throughput | 1 MSPS | 1 MSPS | 1 MSPS | 1.2 MSPS (+20%) |
| Architecture | Half-Flash | Half-Flash | Half-Flash | SAR |
| Internal Reference | 2.5 V, 2% | 2.5 V, 2% | 2.5 V, 2% | External reference only |
| Conversion Time | 420 ns | 420 ns | 420 ns | ~833 ns |
| Power-Down Control | CONVST pin | CONVST pin | CONVST pin | PD pin (separate) |
| Approximate Unit Price | $6.50 | Tube pricing, similar | ~$6.50 | ~$4.20 |
주요 차별점
- Same-package drop-in compatibility with simplified sourcing (vs AD7827BRZ-REEL7)
- Higher throughput in a smaller package (vs AD7478AARMZ-REEL7)
- Single-pin power-down simplifies host firmware (vs AD7478AARMZ-REEL7)
설계 노트
Estimated: AVDD dissipates roughly 30 mW at 5 V during continuous 1 MSPS conversion, dropping to a few hundred microamps in power-down (CONVST low). Place a 10 uF tantalum or ceramic bulk cap plus a 0.1 uF ceramic X7R decoupling cap within 5 mm of the AVDD pin to handle the sampling-capacitor charge kickback that occurs at each CONVST edge; insufficient decoupling directly inflates total harmonic distortion.
Estimated: Route the analog input (VIN) trace away from the serial clock (SCLK) and SDATA lines with at least 5 mm spacing, and surround it with a ground pour tied to the GND pin. The half-flash architecture pulls significant current at every conversion transition, so a star-ground topology from the GND pin back to the supply is recommended over a single shared ground return.
Do not leave CONVST floating - it has an internal bias but noise pickup can falsely trigger conversions. Drive CONVST with a clean digital signal and place a 10 kohm pull-down to guarantee a known idle state. A second common pitfall is using an external clock faster than 1 MHz: while the serial port may clock faster, the internal conversion can only complete in 420 ns so throughput saturation caps effective MSPS at 1.0.
Estimated: Allocate the exposed copper underneath the SOIC-8 body to ground, not to VDD - the small plastic package has limited thermal conductance but large adjacent copper reduces ground bounce. Keep the REF bypass capacitor within 2 mm of pin 3 to prevent reference noise from coupling into the analog input during the conversion window; a single 0.1 uF ceramic cap is normally adequate for the internal reference.
규정 준수 정보
BRZ suffix indicates lead-free RoHS-compliant 8-SOIC package per Analog Devices' product page. AEC-Q100 not applicable - this is a general-purpose industrial ADC. Halogen-free status not stated in the verified web data and is left as [DATA_NEEDED].