AD7888BR-REEL - 12-Bit 125 kSPS 8-Ch SAR ADC | Analog Devices
Référence : AD7888BR-REEL ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $7.2 | $7,20 |
| 10 | $6.45 | $64,50 |
| 100 | $5.3 | $530,00 |
| 500 | $4.55 | $2 275,00 |
| 1 000 | $3.95 | $3 950,00 |
AD7888BR-REEL Présentation
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.
Alternatives de remplacement direct pour AD7888BR-REEL — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec AD7888BR-REEL (même facteur de forme et même empreinte) — différant par Package, Number of Channels, Architecture, Sampling Rate, Data Interface.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
AD7888BRZ-REEL7
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AD7888AR-REEL
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AD7888ARZ-REEL7
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AD7888BR-REEL7
✅ Remplacement direct✓ En stock
$4.95 / unité
Voir la fiche technique →AD7265BCPZ-REEL
✅ Remplacement direct✓ En stock
$8.15 / unité
Voir la fiche technique →AD7327TRU-EP-RL7
✅ Remplacement direct✓ En stock
$21.05 / unité
Voir la fiche technique →AD7888BR-REEL Valeurs maximales et caractéristiques électriques
| Résolution | 12 bits |
| Fréquence d'échantillonnage | 125 kSPS |
| Number of Channels | 8 single-ended (AIN1-AIN8) |
| ADC Architecture | SAR |
| Tension d'alimentation | 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 |
| Tension de référence | External, up to VDD |
| Plage de température de fonctionnement | -40 °C to +85 °C (B grade) |
| Boîtier | 16-SOIC (3.90 mm width) |
| Type de montage | Surface Mount |
| Packaging | Tape & Reel (13-inch reel, REEL) |
| Statut RoHS | Compliant (verify per lot) |
Configuration des broches de AD7888BR-REEL
| Broche 1 | AIN1 — Analog Input 1 |
| Broche 2 | AIN2 — Analog Input 2 |
| Broche 3 | AIN3 — Analog Input 3 |
| Broche 4 | AIN4 — Analog Input 4 |
| Broche 5 | AIN5 — Analog Input 5 |
| Broche 6 | AIN6 — Analog Input 6 |
| Broche 7 | AIN7 — Analog Input 7 |
| Broche 8 | AIN8 — Analog Input 8 |
| Broche 9 | REF — Reference Voltage Input |
| Broche 10 | AGND — Analog Ground |
| Broche 11 | AVDD — Analog Supply Voltage (2.7 V to 5.25 V) |
| Broche 12 | CS — Chip Select (active low) |
| Broche 13 | SCLK — Serial Clock Input |
| Broche 14 | DOUT — Serial Data Output |
| Broche 15 | DIN — Serial Data Input (channel select) |
| Broche 16 | DGND — Digital Ground |
Applications typiques
AD7888BR-REEL convient pour 6 applications: 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour AD7888BR-REEL — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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 |
Principaux différenciateurs
- B-grade linearity on a 16-SOIC footprint (vs AD7888AR-REEL)
- Single 2.7 V to 5.25 V supply with 8 single-ended channels (vs AD7265BCPZ-REEL)
- Micropower 1 µA power-down mode (vs AD7327TRU-EP-RL7)
Notes de conception
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.
Informations de conformité
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.
