AD7825BRZ-REEL7 - 8-Bit 2 MSPS 4-Ch ADC | Analog Devices
부품 번호: AD7825BRZ-REEL7 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $8.4 | $8.40 |
| 10 | $7.56 | $75.60 |
| 100 | $6.72 | $672.00 |
| 500 | $5.96 | $2,980.00 |
| 1,000 | $5.18 | $5,180.00 |
AD7825BRZ-REEL7 개요
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that samples a continuous analog voltage on a periodic clock and quantizes it into a discrete binary digital output. The half-flash (or sub-ranging) topology uses two comparator banks and a coarse/fine conversion cycle to deliver higher throughput than a pure flash architecture while costing less silicon area. Within the broader hierarchy, the AD7825BRZ-REEL7 is a successive-approximation-style pipeline ADC -> data converter -> mixed-signal IC -> semiconductor, designed for moderate-resolution, high-speed acquisition rather than for high-precision instrumentation.
Key features of this ADC include 8-bit resolution, 2 MSPS maximum throughput (1 MSPS guaranteed over temperature), a 420 ns conversion time, an internal 2.5 V reference, a dedicated track-and-hold amplifier, four single-ended input channels, an automatic power-down mode activated through the CONVST pin, and a parallel digital interface. SNR is specified in the Analog Devices datasheet, and offset adjust is available for system-level calibration. Operating temperature is -40C to +85C industrial grade. The combination of wide input bandwidth, integrated reference, and on-chip mux makes the AD7825BRZ-REEL7 well suited for multi-channel data acquisition systems that must remain responsive under burst sampling.
The architecture is a half-flash ADC with two flash blocks sharing a single DAC chain. The on-chip reference reduces external component count and the track-and-hold amplifier eliminates the need for an external sample-and-hold. The CONVST pin both starts a conversion and triggers automatic power-down at the end of the cycle, allowing the part to drop to a low quiescent state between bursts and lowering average power in polled applications.
Typical applications include industrial process control and multi-zone data acquisition, motor control feedback loops, portable instrumentation, automotive sensor clusters (non-safety), battery monitoring systems, and embedded data loggers. Designers should also consider this ADC for any 5 V system where 8-bit resolution and 2 MSPS are sufficient, particularly when an internal reference is desired to minimize PCB area and BOM cost. Choose the -REEL7 reel pack for high-volume surface-mount assembly; for engineering prototypes the AD7825BRZ tube variant is preferred.
When designing with this ADC, place 0.1 uF decoupling capacitors as close as possible to the AVDD and DVDD pins, and keep analog input traces short and guarded to minimize coupling. Note that the wide-body 24-SOIC footprint is larger than the TSSOP variant (AD7825BRU) and the two packages are NOT pin-compatible; verify your PCB land pattern matches the SOIC-24 outline before substituting.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the AD7825BRZ-REEL7 that are not consolidated in any single manufacturer datasheet or distributor listing.
드롭인 대체품: AD7825BRZ-REEL7 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: AD7825BRZ-REEL7 (동일 폼 팩터 및 풋프린트) — 차이점: Number of Input Channels, Packaging, Supply Voltage.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD7825BRZ-REEL
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7825BR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7825BR-REEL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7825BRZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7829BRZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7825BRZ-REEL7 최대 정격 & 전기적 특성
| Number of Bits | 8 |
| 샘플링 속도 | 2 MSPS |
| Conversion Time | 420 ns |
| Number of Input Channels | 4 single-ended |
| Input Type | Single-Ended |
| Data Interface | Parallel |
| Architecture | Half-Flash (Pipelined) |
| Reference Type | Internal, 2.5 V (2% tolerance) |
| On-Chip Track-and-Hold | Yes |
| 공급 전압 | 3 V / 5 V single supply |
| 동작 온도 | -40C to +85C |
| 패키지 / 케이스 | 24-SOIC (0.295 inch / 7.50 mm width) |
| 실장 유형 | Surface Mount |
| Packaging | Tape & Reel (REEL7) |
| Power-Down Mode | Automatic via CONVST pin |
AD7825BRZ-REEL7 핀 구성
| 핀 1 | VIN1 — Analog input channel 1 |
| 핀 2 | VIN2 — Analog input channel 2 |
| 핀 3 | VIN3 — Analog input channel 3 |
| 핀 4 | VIN4 — Analog input channel 4 |
| 핀 5 | AGND — Analog ground |
| 핀 6 | DB0 — Data bit 0 (LSB) |
| 핀 7 | DB1 — Data bit 1 |
| 핀 8 | DB2 — Data bit 2 |
| 핀 9 | DB3 — Data bit 3 |
| 핀 10 | DB4 — Data bit 4 |
| 핀 11 | DB5 — Data bit 5 |
| 핀 12 | DB6 — Data bit 6 |
| 핀 13 | DB7 — Data bit 7 (MSB) |
| 핀 14 | RD — Read strobe (active low) |
| 핀 15 | WR — Write / mode-select strobe |
| 핀 16 | CS — Chip select (active low) |
| 핀 17 | CONVST — Conversion start; triggers automatic power-down at end of conversion |
| 핀 18 | DVDD — Digital supply voltage (3 V or 5 V) |
| 핀 19 | DGND — Digital ground |
| 핀 20 | AVDD — Analog supply voltage (3 V or 5 V) |
| 핀 21 | VREF — Internal 2.5 V reference output / external reference input |
| 핀 22 | REFADJ — Reference adjust (for trim) |
| 핀 23 | OFFSET_ADJ — Input offset adjust |
| 핀 24 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
AD7825BRZ-REEL7 적합 용도: 6 애플리케이션s: Industrial Process Control & Multi-Zone Data Acquisition, Motor Control Feedback Loops, Portable Instrumentation & Handheld Test Equipment, Automotive Sensor Clusters (Non-Safety), Battery Monitoring Systems (BMS), Embedded Data Loggers & Edge Acquisition Nodes.
Industrial Process Control & Multi-Zone Data Acquisition
The AD7825BRZ-REEL7 is well suited for industrial 4-zone data acquisition because its 4 single-ended input channels can be multiplexed through one ADC core with up to 2 MSPS throughput, allowing simultaneous sampling of temperature, pressure, and flow sensor outputs from a single IC. Its integrated 2.5 V reference eliminates the need for an external reference and the on-chip track-and-hold removes the requirement for an external sample-and-hold amplifier, reducing BOM cost and PCB area. The wide-body 24-SOIC package tolerates the thermal and mechanical stress of factory-floor enclosures while supporting the industrial -40C to +85C operating range required by process-control equipment. Compared with discrete ADC-plus-mux implementations, the AD7825BRZ-REEL7 cuts BOM line items and simplifies calibration because the internal reference is trimmed to 2% tolerance.
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Motor Control Feedback Loops
The AD7825BRZ-REEL7 fits 5 V motor-control feedback loops where 4 channels are required to digitize phase current, bus voltage, and position feedback at 2 MSPS with 420 ns conversion latency. Its half-flash architecture delivers deterministic conversion time, which matters when the control loop must sample at fixed PWM-aligned instants and feed the result to the MCU within the same switching period. The CONVST-triggered automatic power-down mode lowers average current draw in burst-mode torque loops where the controller only samples when the motor is actively driven. The wide 24-SOIC footprint eases thermal management of the 5 V regulator area on the same PCB, and the parallel interface easily connects to common DSP and MCU external memory buses without glue logic.
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Portable Instrumentation & Handheld Test Equipment
Portable digital multimeters, oscilloscope front ends, and handheld data loggers benefit from the AD7825BRZ-REEL7's automatic power-down via the CONVST pin, which can drop quiescent current between sampled bursts to extend battery life. The 4 single-ended channels allow direct connection to multiple sensor types (voltage, current shunt, thermistor bridge) without an external mux, while the internal 2.5 V reference keeps total BOM cost low for cost-sensitive consumer test tools. The wide-body 24-SOIC package is mechanically robust and easy to hand-solder during low-volume manufacturing of niche test instruments. Compared with external-reference ADCs of similar speed, the AD7825BRZ-REEL7 saves board space and design effort in battery-powered products.
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Automotive Sensor Clusters (Non-Safety)
Body-electronics and comfort-control modules can deploy the AD7825BRZ-REEL7 to digitize 4 analog sensors (cabin temperature, ambient light, fuel level, battery sense) at 2 MSPS with deterministic 420 ns conversion time. The 4 single-ended channels map directly to these sensor outputs without an external mux, and the integrated track-and-hold captures clean snapshots even when the sensors are at the end of long PCB traces. The wide 24-SOIC footprint eases inspection in low-volume automotive tier-2 manufacturing. Note that the AD7825BRZ-REEL7 is NOT AEC-Q100 qualified; for safety-critical ADAS applications use an AEC-Q100 ADC such as the AD7476 automotive variant instead.
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Battery Monitoring Systems (BMS)
Multi-cell battery monitoring boards can use the AD7825BRZ-REEL7 to digitize 4 cell voltages in a 12-48 V battery stack at 2 MSPS with deterministic 420 ns conversion latency per channel. The internal 2.5 V reference provides stable readings across the -40C to +85C industrial range typical of BMS applications, and the half-flash architecture keeps conversion time predictable regardless of input voltage. The automatic power-down via CONVST allows the controller to wake the ADC only when new readings are required, lowering quiescent draw on the always-on battery sense rail. The 24-SOIC wide-body package supports the mechanical robustness requirements of industrial battery packs. For higher-channel-count BMS designs, the AD7264BSTZ-5-RL7 provides a 14-channel upgrade path with similar speed.
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Embedded Data Loggers & Edge Acquisition Nodes
Embedded data loggers and IIoT edge acquisition nodes can leverage the AD7825BRZ-REEL7's 4 single-ended channels to capture multiple sensor inputs (temperature, humidity, flow, voltage) into a local buffer at 2 MSPS before the MCU compresses and transmits the data. The 8-bit resolution is sufficient for many sensor-class signals where the dynamic range is bounded by the transducer. The integrated 2.5 V reference, on-chip track-and-hold, and parallel interface combine to minimize external component count and BOM cost in compact IIoT modules. The wide-body 24-SOIC package simplifies hand-soldering in low-volume or prototype builds typical of edge-node deployments. Compared with discrete ADC-plus-mux implementations, the AD7825BRZ-REEL7 reduces both BOM and PCB area while simplifying firmware by removing mux-switch sequencing from the MCU.
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추천 제품 요약
엔지니어링 참조 데이터: AD7825BRZ-REEL7 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AD7825BRZ-REEL | AD7825BR | AD7825BR-REEL7 | AD7825BRZ | AD7829BRZ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 24-SOIC (wide body, 0.295 inch) | 24-SOIC (wide body) - same | 24-SOIC (wide body) - same | 24-SOIC (wide body) - same | 24-SOIC (wide body) - same | 24-SOIC (wide body) - same |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Sampling Rate | 2 MSPS | 2 MSPS | 2 MSPS | 2 MSPS | 2 MSPS | 2 MSPS |
| Conversion Time | 420 ns | 420 ns | 420 ns | 420 ns | 420 ns | 420 ns |
| Number of Input Channels | 4 single-ended | 4 single-ended | 4 single-ended | 4 single-ended | 4 single-ended | 8 single-ended |
| Internal Reference | 2.5 V (2%) | 2.5 V (2%) | 2.5 V (2%) | 2.5 V (2%) | 2.5 V (2%) | 2.5 V (2%) |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C | 0C to +70C (commercial) | 0C to +70C (commercial) | -40C to +85C | -40C to +85C |
| Packaging | Tape & Reel (REEL7, 7-inch) | Tape & Reel (full reel) | Tube | Tape & Reel (REEL7) | Tube | Tube |
주요 차별점
- Internal 2.5 V reference eliminates external reference BOM (vs AD7264BSTZ-5-RL7 (external reference required))
- Automatic power-down via CONVST pin (vs AD7324BRUZ-REEL (no integrated auto-power-down))
- On-chip track-and-hold eliminates external SHA (vs AD7472ARUZ-REEL (basic successive-approximation, requires fast external driver))
- Wide-body 24-SOIC footprint for easy hand-soldering and inspection (vs AD7825BRUZ-REEL7 (24-TSSOP, narrower))
설계 노트
Place 0.1 uF decoupling capacitors as close as possible to the AVDD (pin 20) and DVDD (pin 18) pins, with the ground return to the AGND (pin 5) and DGND (pin 19) pins respectively. Add a 10 uF bulk tantalum or ceramic capacitor near the supply pins to suppress board-level switching noise. Separate analog (AVDD/AGND/VINx) and digital (DVDD/DGND/DBx/CONVST) ground regions, joining them at a single point under the IC. This layout minimizes digital switching noise coupling into the analog input or reference, which is the dominant cause of degraded SNR in 8-bit half-flash ADC designs.
Keep analog input traces short and guarded by a ground pour on both sides and below. The AD7825BRZ-REEL7 inputs have limited input bandwidth; long unguarded traces will couple in switching noise from adjacent digital lines and cause channel-to-channel crosstalk. Source-impedance matching is important - the input RC formed by source impedance and the 5 pF input capacitance should settle to within 1/2 LSB (about 5 mV at 2.5 V FS) within the 420 ns acquisition window. A source resistance below 1 kohm typically avoids settle-time issues.
Do NOT confuse the SOIC-wide AD7825BRZ-REEL7 with the TSSOP AD7825BRUZ-REEL7. The two packages share the same silicon and pinout numbering but use different lead pitches (SOIC is 0.05 inch / 1.27 mm; TSSOP is 0.026 inch / 0.65 mm) and different body widths (7.5 mm vs 4.4 mm). The PCB land patterns are NOT compatible; verify your footprint matches the SOIC-24 wide-body outline before substituting. Mixing them up will either fail solder-joint inspection (TSSOP on SOIC pads) or short adjacent pins (SOIC on TSSOP pads).
The CONVST pin both starts a conversion and triggers automatic power-down at the end of the cycle, so leave the CONVST line idle low between conversions and only pulse it high when you need a fresh reading. The standard cycle is: drive CONVST high -> internal T/H acquires -> 420 ns later conversion completes -> part returns to power-down automatically. For continuous full-speed operation, drive CONVST with a 50% duty-cycle clock at the desired sample rate; for low-power polling, pulse CONVST only when the MCU needs data. Power dissipation at 2 MSPS continuous sampling is specified in the Analog Devices datasheet.
Route the parallel digital output bus (DB0-DB7) away from the analog input traces and the VREF pin to avoid digital-to-analog coupling during active conversions. If the MCU sits on the opposite side of the board, route the digital bus on inner layers with ground reference above and below. Add 50 ohm series termination on the digital outputs if the bus length exceeds 50 mm to dampen ringing at the 2 MSPS conversion rate.
규정 준수 정보
RoHS and REACH compliant per Analog Devices product page; 'Z' suffix indicates lead-free matte-tin plating. NOT AEC-Q100 qualified - use an AEC-Q100 ADC such as the AD7476 automotive variant for safety-critical automotive applications.
