AD7888BR-REEL - 12-Bit 125 kSPS 8-Ch SAR ADC | Analog Devices
MPN: AD7888BR-REEL ✓ Hoạt độngAD7888BR-REEL Tóm tắt
A SAR ADC is a type of analog-to-digital converter that uses a binary-search successive-approximation algorithm to digitize an analog input in N conversion cycles for an N-bit code. SAR ADCs sit within the broader hierarchy of data converters (ADC -> Nyquist-rate ADC -> SAR ADC -> mixed-signal IC -> semiconductor). They are valued for low-latency conversions, deterministic behavior, and excellent DC accuracy without pipeline delay, making them ideal for multiplexed channel sampling in embedded systems.
Key features include 8 single-ended analog input channels (AIN1-AIN8), an input track-and-hold with 500 ns acquisition time, a serial interface compatible with SPI/QSPI/MICROWIRE/DSP, and an analog input range of 0 V to VREF. The AD7888 operates from a single supply and offers low power consumption, which makes it suitable for battery-powered and portable designs. The converter's throughput of 125 kSPS supports multichannel scanning applications such as sensor arrays and process control.
The AD7888 uses an on-chip clock and reference input buffer; external VREF up to VDD is supported. The serial interface allows direct connection to most modern microcontrollers and DSPs without glue logic. The architecture also integrates channel-selection logic, so a single command initiates a conversion on the addressed channel and streams the 12-bit result.
Typical applications include portable instrumentation, data acquisition systems, battery-powered monitoring, industrial process control, and sensor signal conditioning. The wide supply range (2.7 V to 5.25 V) simplifies integration with 3.3 V and 5 V MCUs.
When designing with this part, place 0.1 µF decoupling capacitors close to AVDD and ensure the serial clock stays below the rated throughput to avoid data corruption. For multi-channel scanning, sequence channel switches between conversions to allow full settling of the input track-and-hold.
This page combines verified distributor stock data, drop-in SOIC-16 alternative MPNs, and practical design guidance not always visible in the manufacturer datasheet, giving engineers a single reference for evaluation, sourcing, and PCB design.
Bộ thay thế dễ dàng lắp đặt cho AD7888BR-REEL — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với AD7888BR-REEL (cùng hình factor và footprint) — khác nhau ở Package, Number of Channels, Architecture, Sampling Rate, Data Interface.
AD7888BRZ-REEL7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7888AR-REEL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7888ARZ-REEL7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7888BR-REEL7
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7265BCPZ-REEL
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7327TRU-EP-RL7
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7888BR-REEL Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bits |
| Tỷ lệ lấy mẫu | 125 kSPS |
| Number of Channels | 8 single-ended (AIN1-AIN8) |
| ADC Architecture | SAR |
| Điện áp cung cấp | 2.7 V to 5.25 V (single) |
| Analog Input Range | 0 V to VREF |
| Input Acquisition Time | 500 ns |
| Power Consumption (typ, 3V) | 2 mW |
| Power-Down Current | 1 µA |
| Data Interface | SPI, QSPI, MICROWIRE, DSP-compatible serial |
| Điện áp tham chiếu | External, up to VDD |
| Khoảng nhiệt độ hoạt động | -40 °C to +85 °C (B grade) |
| Hộp | 16-SOIC (3.90 mm width) |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tape & Reel (13-inch reel, REEL) |
| Trạng thái RoHS | Compliant (verify per lot) |
Cấu hình chân AD7888BR-REEL
| Chân 1 | AIN1 — Analog Input 1 |
| Chân 2 | AIN2 — Analog Input 2 |
| Chân 3 | AIN3 — Analog Input 3 |
| Chân 4 | AIN4 — Analog Input 4 |
| Chân 5 | AIN5 — Analog Input 5 |
| Chân 6 | AIN6 — Analog Input 6 |
| Chân 7 | AIN7 — Analog Input 7 |
| Chân 8 | AIN8 — Analog Input 8 |
| Chân 9 | REF — Reference Voltage Input |
| Chân 10 | AGND — Analog Ground |
| Chân 11 | AVDD — Analog Supply Voltage (2.7 V to 5.25 V) |
| Chân 12 | CS — Chip Select (active low) |
| Chân 13 | SCLK — Serial Clock Input |
| Chân 14 | DOUT — Serial Data Output |
| Chân 15 | DIN — Serial Data Input (channel select) |
| Chân 16 | DGND — Digital Ground |
Ứng dụng tiêu biểu
AD7888BR-REEL phù hợp cho 6 Áp dụngs: Portable Data Acquisition, Industrial Process Control, Sensor Signal Conditioning, Battery Monitoring Systems, Medical Monitoring Equipment, Automotive Sensor Interface.
Portable Data Acquisition
The AD7888BR-REEL's 125 kSPS throughput, 2 mW typical power consumption at 3 V, and 1 µA power-down current make it ideal for battery-powered data acquisition modules. Engineers typically scan 8 single-ended channels sequentially with an MCU that wakes from sleep between conversions, leveraging the chip's 500 ns acquisition time. The 2.7 V to 5.25 V single-supply range lets the ADC share a regulator with a 3.3 V ARM Cortex-M0 host without level shifters, keeping the BOM small and the quiescent draw minimal for handheld multimeters and field recorders.
Được đề xuất
Industrial Process Control
In PLC analog input modules and 4-20 mA loop monitors, the AD7888BR-REEL's 8 single-ended inputs and 125 kSPS throughput let a single ADC digitize multiple sensor channels per scan cycle. The B-grade -40 °C to +85 °C operating range handles factory floor thermal stress, and the 0 V to VREF input range simplifies ratiometric measurements with bridge sensors. Designers pair it with external protection circuitry and an external reference such as the ADR03 for stable readings across long calibration intervals.
Được đề xuất
Sensor Signal Conditioning
For temperature, pressure, strain-gauge, and thermopile sensor front-ends, the AD7888BR-REEL's 8-channel input multiplexer and SPI-compatible serial interface let one ADC digitize an entire sensor array. The 500 ns track-and-hold acquisition time settles cleanly on slowly varying signals typical of thermocouples and RTDs. The chip's small SOIC-16 footprint fits behind the sensor cluster on compact PCBs, and the serial data stream is easily framed by an 8-bit MCU for downstream filtering and linearization.
Được đề xuất
Battery Monitoring Systems
Lithium-ion battery management boards benefit from the AD7888BR-REEL's 8 single-ended channels, allowing cell voltage, pack current shunt, and temperature thermistor measurements through a single ADC. The 1 µA power-down mode enables periodic scan duty cycling where the ADC is active only during measurements, extending standby life. With a 2.7 V minimum supply, the part operates directly from a single Li-ion cell, eliminating the need for boost converters in the measurement path.
Được đề xuất
Medical Monitoring Equipment
Patient monitors and portable diagnostic devices leverage the AD7888BR-REEL's low 2 mW typical power consumption and small SOIC-16 footprint for compact, battery-friendly analog front-ends. Eight single-ended channels support multi-lead ECG, SpO2, temperature, and respiration sensor inputs in a single ADC, reducing board area and BOM cost. The 125 kSPS throughput easily handles the bandwidth requirements of physiological signals while the deterministic SAR latency ensures synchronized sampling across channels.
Được đề xuất
Automotive Sensor Interface
In automotive body and chassis modules, the AD7888BR-REEL's 8-channel input and -40 °C to +85 °C B-grade operating range digitize multiple analog sensors including throttle position, pedal feedback, and suspension height inputs. The single 2.7 V to 5.25 V supply lets the ADC share the 5 V automotive rail without regulators, and the SPI-compatible serial output interfaces directly with CAN-enabled microcontrollers. Designers add TVS protection on each input to meet OEM load-dump and ESD requirements.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7888BR-REEL — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | AD7888BRZ-REEL7 | AD7888AR-REEL | AD7888ARZ-REEL7 | AD7888BR-REEL7 | AD7265BCPZ-REEL | AD7327TRU-EP-RL7 |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 16-SOIC | 16-SOIC - same | 16-SOIC - same | 16-SOIC - same | 16-SOIC - same | 16-SOIC - same | 16-SOIC - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 125 kSPS | 125 kSPS | 125 kSPS | 125 kSPS | 125 kSPS | 1 MSPS | 500 kSPS |
| Number of Channels | 8 single-ended | 8 single-ended | 8 single-ended | 8 single-ended | 8 single-ended | 2 differential | 8 (software-configurable) |
| 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 | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V |
Bảo phân biệt quan trọng
- B-grade linearity on a 16-SOIC footprint (vsAD7888AR-REEL)
- Single 2.7 V to 5.25 V supply with 8 single-ended channels (vsAD7265BCPZ-REEL)
- Micropower 1 µA power-down mode (vsAD7327TRU-EP-RL7)
Ghi chú thiết kế
Estimated: at 3 V supply and 125 kSPS continuous conversion, the AD7888BR-REEL draws approximately 0.67 mA average current (2 mW / 3 V). For duty-cycled sampling at 1 kSPS aggregate throughput, average current falls below 10 µA after subtracting the 1 µA power-down floor. Place a 0.1 µF ceramic decoupling capacitor within 3 mm of the AVDD pin and a 10 µF bulk capacitor on the supply rail to suppress switching transients from the host MCU.
Keep the analog input traces short and shielded with a ground pour to minimize coupled noise on the AIN1-AIN8 lines. Route the serial interface traces (CS, SCLK, DOUT, DIN) away from the analog inputs and REF net, and place the external reference capacitor (typically 0.1 µF to 10 µF) directly at the REF pin. A single solid ground plane split under the AGND and DGND pins reduces digital-to-analog crosstalk.
Do not drive AIN1-AIN8 above VDD or below AGND; the analog inputs are single-ended with a 0 V to VREF range. Exceeding VREF causes ESD latch-up. The serial clock must remain below the rated throughput to avoid incomplete data readout. If the host MCU shares the SPI bus with other peripherals, ensure CS is held low only during the active conversion window to prevent bus contention on DOUT.
Thông tin tuân thủ
The -REEL suffix indicates tape-and-reel packaging. RoHS compliance status not explicitly stated in verified web data - confirm per lot with Analog Devices. Not AEC-Q100 qualified; for automotive applications requiring AEC-Q100, select a Q-grade variant or use an external automotive-qualified ADC.
