AD7927BRUZ-REEL7 - 12-Bit 200kSPS 8-Ch SAR ADC | Analog Devices
부품 번호: AD7927BRUZ-REEL7 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $8.45 | $8.45 |
| 10 | $7.61 | $76.10 |
| 100 | $6.77 | $677.00 |
| 500 | $5.94 | $2,970.00 |
| 1,000 | $5.1 | $5,100.00 |
AD7927BRUZ-REEL7 개요
A SAR ADC is a successive-approximation analog-to-digital converter that resolves one bit per conversion cycle using a binary-search algorithm against an internal or external reference. SAR architecture is favored for applications that require deterministic latency, low power consumption, and excellent DC accuracy without the complexity of pipeline or delta-sigma designs. Within the broader power-management and data-acquisition hierarchy, the AD7927 belongs to the precision-converter family, sitting under analog-to-digital converters, which themselves are key building blocks inside signal-chain ICs and embedded data acquisition subsystems.
Key features of the AD7927BRUZ-REEL7 include 200 kSPS throughput, an analog input range of 0 V to VREF (with VREF supplied externally, typically 2.5 V), a sequencer that cycles through the eight analog inputs automatically, and a low-power dissipation profile of 3.6 mW typical at 200 kSPS with a 3 V supply and 7.5 mW typical at 200 kSPS with a 5 V supply. The serial interface is compatible with DSP, MICROWIRE, QSPI, and SPI protocols, allowing direct connection to most microcontrollers and DSPs without glue logic.
Architecturally, the AD7927 integrates an 8-channel analog input multiplexer, a fully differential track-and-hold, a 12-bit SAR core, a control logic block, and an external-reference input. The on-chip sequencer can be programmed to convert a user-defined subset of channels in any order, enabling efficient channel scanning without repeated register writes. The wide input bandwidth (>8 MHz) ensures accurate sampling of fast transients on any selected channel before digitization.
Typical applications include industrial process control, multi-zone temperature monitoring via thermocouples or RTDs, instrumentation data acquisition, portable battery-powered measurement, optical-module monitoring (SFF/SFP transceivers), and embedded motor-control feedback. The combination of 8 single-ended inputs, low power, and SPI compatibility makes the AD7927 ideal for space-constrained designs requiring multi-sensor monitoring.
A key design consideration is reference selection. Because the AD7927 does not include an internal reference, the absolute accuracy of every conversion is gated by the external reference. Using a low-drift, low-noise 2.5 V reference such as the ADR01 or ADR435 is recommended for precision applications; noise on VREF directly translates to gain error and noise floor.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet to accelerate component selection, BOM risk reduction, and second-source qualification.
드롭인 대체품: AD7927BRUZ-REEL7 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD7927BRUZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7927WYRUZ-REEL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7924BRUZ
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
AD7928BRUZ
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
AD7920BRUZ
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
MAX1302
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7927BRUZ-REEL7 최대 정격 & 전기적 특성
| 분해능 | 12 bits |
| Number of Input Channels | 8 |
| Architecture | SAR (Successive Approximation) |
| Throughput Rate | 200 kSPS |
| Supply Voltage Range | 2.7 V to 5.25 V (single supply) |
| Analog Input Range | 0 V to VREF |
| External Reference Voltage | 2.5 V typical (supplied externally) |
| Input Bandwidth (Track-and-Hold) | 8 MHz minimum |
| Power Dissipation (3 V / 200 kSPS) | 3.6 mW typical |
| Power Dissipation (5 V / 200 kSPS) | 7.5 mW typical |
| Serial Interface | SPI / MICROWIRE / QSPI / DSP-compatible |
| Sequencer | On-chip, programmable channel sequencing |
| 패키지 | 20-pin TSSOP (RU suffix, 0.173 in / 4.40 mm body width) |
| 실장 유형 | Surface Mount |
| 동작 온도 범위 | -40C to +85C (industrial grade) |
| MSL (Moisture Sensitivity Level) | 1 (Unlimited, per PartGenie profile) |
| RoHS Compliance | ROHS3 Compliant |
| REACH Status | Unaffected (per PartGenie profile) |
AD7927BRUZ-REEL7 핀 구성
| 핀 1 | AGND — Analog ground reference |
| 핀 2 | VIN0 — Analog input channel 0 |
| 핀 3 | VIN1 — Analog input channel 1 |
| 핀 4 | VIN2 — Analog input channel 2 |
| 핀 5 | VIN3 — Analog input channel 3 |
| 핀 6 | VIN4 — Analog input channel 4 |
| 핀 7 | VIN5 — Analog input channel 5 |
| 핀 8 | VIN6 — Analog input channel 6 |
| 핀 9 | VIN7 — Analog input channel 7 |
| 핀 10 | REFIN/REFOUT — External reference input / internal reference output |
| 핀 11 | CAP — Reference decoupling capacitor connection |
| 핀 12 | DGND — Digital ground reference |
| 핀 13 | DVDD — Digital supply voltage (2.7V to 5.25V) |
| 핀 14 | /CS — Chip-select, active low (frame control for serial interface) |
| 핀 15 | SCLK — Serial clock input |
| 핀 16 | DOUT — Serial data output (ADC results) |
| 핀 17 | DIN — Serial data input (sequencer programming) |
| 핀 18 | AVDD — Analog supply voltage (2.7V to 5.25V) |
| 핀 19 | AGND — Analog ground reference (second tie) |
| 핀 20 | AGND — Analog ground reference (third tie) |
일반적인 애플리케이션
AD7927BRUZ-REEL7 적합 용도: 7 애플리케이션s: Industrial Process Control and PLC Analog Input Modules, Multi-Zone Temperature Monitoring (Thermocouple/RTD Networks), Data Acquisition Systems and Instrumentation, Optical Module Diagnostics (SFF/SFP Transceiver Monitoring), Portable and Battery-Powered Measurement Devices, Embedded Motor Control Feedback, Medical and Patient Monitoring Accessories.
Industrial Process Control and PLC Analog Input Modules
The AD7927BRUZ-REEL7 fits multi-channel PLC analog input modules where eight 12-bit readings must be acquired at deterministic intervals. With 200 kSPS throughput and an on-chip programmable sequencer, the part can cycle through eight thermocouple, RTD, or 4-20 mA conditioned inputs autonomously, freeing the host CPU from per-channel register writes. The SPI-compatible serial interface connects directly to an ARM Cortex-M0/M4 host on the same PCB, and the 2.7 V to 5.25 V supply matches typical industrial 5 V and 3.3 V rails. Compared to discrete ADCs, the 20-pin TSSOP footprint keeps the BOM dense for high-density PLC cards. Decision-makers should pair the part with a low-drift reference such as the Analog Devices ADR435 for absolute accuracy.
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Multi-Zone Temperature Monitoring (Thermocouple/RTD Networks)
The AD7927BRUZ-REEL7 is well suited for multi-zone temperature monitoring in HVAC control, cold-chain logistics, and battery thermal management. Eight single-ended analog inputs accept pre-amplified thermocouple or RTD signals sequentially with 12-bit resolution and 200 kSPS throughput; each zone is sampled by the on-chip sequencer with deterministic latency, simplifying compliance with standards such as EN 12830 (cold-chain temperature recorders). Low power draw (3.6 mW at 3 V / 200 kSPS) suits battery-backed data loggers. Pair with a low-offset instrumentation front end (e.g., AD8226) per zone and a precision reference such as ADR01 to keep absolute error below 0.5 C. TSSOP-20 footprint enables dense multi-zone layouts.
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Data Acquisition Systems and Instrumentation
For PC-based or modular data acquisition (DAQ) instruments, the AD7927BRUZ-REEL7 provides 8 channels of 12-bit SAR ADC with a serial interface that streams to an FPGA front-end or a USB bridge. Its >8 MHz input bandwidth captures fast transients on input signals, while the SAR architecture delivers single-cycle conversion results - essential for triggering and time-correlated measurements. The wide 2.7 V to 5.25 V supply supports field-instrument designs with input range tolerance for battery or USB-bus power. A common pattern pairs the ADC with an op-amp signal-conditioning front end and an external 2.5 V reference. Across 8 channels, throughput of 200 kSPS allows aggregate per-channel rates that suit acoustic, vibration, or general-purpose analog sensing.
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Optical Module Diagnostics (SFF/SFP Transceiver Monitoring)
The AD7927BRUZ-REEL7 is widely used for analog housekeeping monitoring inside optical transceiver modules and line cards. The 8 channels accommodate supply rails, laser bias, received-signal-strength indicator (RSSI), and temperature through multiple ADC channels while staying within the tight SFP/SFF power budget. Its 3.6 mW dissipation at 3 V / 200 kSPS ensures compliance with the strict module thermal envelope, and the small TSSOP-20 footprint keeps PCB area minimal. The SPI port allows the same host MCU to read back eight housekeeping channels without a glue-logic chip, and the sequencer avoids per-channel I/O chatter. Reference the AD7927 datasheet's typical application circuit when designing SFP DOM (digital optical monitoring) blocks.
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Portable and Battery-Powered Measurement Devices
The AD7927BRUZ-REEL7 supports portable, battery-powered measurement devices (handheld multimeters, field data loggers, patient-monitoring accessories) where 8 channels, 12-bit accuracy, and very low power are needed simultaneously. At 3 V supply and 200 kSPS the part dissipates only 3.6 mW, and partial-channel shutdown mode scales power further between conversions. The 20-pin TSSOP package fits handhelds that cannot accept power-hungry parallel-output ADCs, and the SPI port helps preserve MCU pin budget for the human-interface section. Pair with an LD3985 LDO and an external 2.5 V ADR435 reference for an example portable-instrument signal chain.
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Embedded Motor Control Feedback
The AD7927BRUZ-REEL7 addresses multi-axis motor control feedback by sampling DC bus voltage, phase currents (via sense resistors), and temperature sensors across up to 8 channels per ADC. SAR conversion provides deterministic 5 uS conversion latency at the SCLK rate, ensuring precise current-loop timing and synchronized torque updates. Its 8 MHz input bandwidth handles the PWM-edge transients seen in current shunts with proper anti-alias filtering, and the SPI port interfaces directly to dsPIC, STM32, or Kinetis motor-control MCUs. TSSOP packaging withstands industrial -40 C to +85 C operation needed for servo drives and robotic-arm controllers. The datasheet's typical application circuit illustrates RC filter sizing between the current shunt and ADC input.
추천
Medical and Patient Monitoring Accessories
The AD7927BRUZ-REEL7 fits medical accessories (vital-sign monitors, infusion-pump sensors) with multi-channel low-power analog digitization needs. Eight single-ended inputs accept ECG lead-off detect, SpO2 photodiode signal, and temperature/voltage housekeeping with 12-bit resolution, allowing the host MCU to compute diagnostics without external mux/buffer ICs. The 3 V supply operation suits battery-powered bedside instruments, and the SAR architecture's deterministic latency simplifies FDA/IEC 62304 audit-trace designs. Use the on-chip sequencer for autonomous channel cycling and pair with a low-noise instrumentation amplifier front-end to stay within IEC 60601-1 noise-immunity budgets.
추천
추천 제품 요약
엔지니어링 참조 데이터: AD7927BRUZ-REEL7 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AD7927BRUZ | AD7927WYRUZ-REEL7 | AD7924BRUZ | AD7928BRUZ | MAX1302 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Maxim Integrated |
| Package | 20-TSSOP (RU, 4.40 mm) | 20-TSSOP | 20-TSSOP | 20-TSSOP | 20-TSSOP | 24-TSSOP (approx) |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12/14 bits (configurable) |
| Number of Input Channels | 8 | 8 | 8 | 8 | 8 | 8 or 12 (configurable) |
| Throughput Rate | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS | 225 kSPS |
| Supply Voltage Range | 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 | 2.7 V to 5.25 V | 4.75 V to 5.25 V |
| Serial Interface | SPI / MICROWIRE / QSPI | SPI / MICROWIRE / QSPI | SPI / MICROWIRE / QSPI | SPI / MICROWIRE / QSPI | SPI / MICROWIRE / QSPI | SPI / QSPI / MICROWIRE |
| External Reference Required | Yes (2.5 V typical) | Yes | Yes | Yes | Yes | Yes (internal 4.096V option) |
| Sequencer | On-chip programmable | On-chip programmable | On-chip programmable | On-chip programmable | On-chip programmable + per-channel shutdown | Internal channel sequencer |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
주요 차별점
- Programmable on-chip sequencer eliminates per-channel register writes (vs MAX1302)
- Wider supply range for battery and fieldbus designs (vs MAX1302)
- 20-pin TSSOP package density vs older 24-pin alternatives (vs MAX1302)
- Verified pin-compatible family for second-source qualification (vs AD7928BRUZ)
설계 노트
AVDD must be decoupled with a 10 uF tantalum in parallel with a 0.1 uF ceramic capacitor placed within 5 mm of the pin, per the AD7927 datasheet's typical application circuit. DVDD may share the AVDD rail through a ferrite bead if both are powered from the same source, but separate regulators are recommended for the strictest AC performance. Power-on reset time depends on the AVDD rise-time and the capacitor on the CAP pin - budget a 5 ms warm-up before initiating conversions.
Place the analog inputs and the reference decoupling capacitor as close as possible to the AD7927 TSSOP-20 pins and isolate analog and digital grounds on a split ground plane tied together only at the AGND pin. According to the AD7927 datasheet, large digital currents flowing under the analog section couple into the reference and degrade AC performance. Use microvia stitching around the analog inputs to reduce ground-bounce; a 4-layer board with a dedicated ground plane is preferred for high-throughput operation.
Do not exceed 5.25 V on AVDD/DVDD, do not allow analog inputs to exceed AVDD by more than 0.3 V or fall below AGND by more than 0.3 V (input clamps will forward-conduct), and do not omit the 10 uF + 0.1 uF decoupling on VDD or the reference bypass cap. Per the AD7927 datasheet, the reference pin REFIN/REFOUT requires a 0.1 uF plus 10 uF capacitor to AGND; without these the effective number of bits (ENOB) will drop substantially.
Add a series 1 kohm plus 100 pF anti-alias RC network on each VINx input when the source impedance exceeds 200 ohm or when wide-bandwidth (>200 kHz) content can fold back into the ADC's bandwidth. Estimated: for a 200 kSPS sample rate and a simple RC filter, -3 dB corner should be placed near 200 kHz to balance aliasing vs signal attenuation. The AD7927's >8 MHz input bandwidth does not replace anti-aliasing - the track-and-hold bandwidth is wide enough to capture transients, but aliasing still occurs in the digitized data.
규정 준수 정보
RoHS3 compliant (Pb-free matte-tin finish) per PartGenie compliance profile and Analog Devices lead-free finish indicator 'Z' in BRUZ suffix. REACH unaffected per PartGenie compliance profile. Not AEC-Q100 qualified - choose AD7927WYRUZ-REEL7 for automotive-grade extended-temperature operation. MSL 1 (unlimited floor life).
