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Analog Devices Inc. AD7887BR-REEL
- Part No.:
- AD7887BR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7887BR-REEL.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,235
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Product details
Overview
AD7887BR-REEL from Analog Devices is a micropower, 12-bit successive approximation register (SAR) ADC supporting single- or dual-channel operation, 125 kSPS throughput, 2.7 V to 5.25 V supply, and 2.5 V internal reference - used in battery-powered medical instruments and portable data acquisition systems.
For engineers reviewing the AD7887BR-REEL datasheet, AD7887BR-REEL pinout, AD7887BR-REEL application, or AD7887BR-REEL equivalent, key selection criteria include its 8-lead MSOP package, SPI/QSPI/MICROWIRE-compatible serial interface, configurable power-down modes (1 μA shutdown), and dual-input voltage range flexibility (0–VREF or 0–VDD).
Technical Context
The AD7887BR-REEL implements a charge-redistribution SAR architecture with integrated track-and-hold, achieving full-power bandwidth of 2.5 MHz and 500 ns acquisition time. Its control logic supports software-configurable operation via an 8-bit write-only register that selects single/dual channel mode, reference source (internal 2.5 V or external 1.2–VDD), and one of four power management modes.
Conversion uses straight binary coding with LSB = VREF/4096; analog inputs feature ±5 μA leakage and 20 pF capacitance. The device operates across −40°C to +125°C and is qualified for automotive applications, with CMOS construction enabling 2 mW typical active power dissipation at 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output levels for high-fidelity signal digitization in instrumentation. |
| Throughput Rate | 125 kSPS - enables real-time sampling of signals up to 2.5 MHz (Nyquist-limited), suitable for modem and sensor monitoring. |
| Supply Voltage | 2.7 V to 5.25 V - supports direct integration into both 3 V and 5 V embedded systems without level-shifting. |
| Reference Source | Internal 2.5 V ±50 ppm/°C or external 1.2 V to VDD - allows precision scaling of input range (0–VREF or 0–VDD) per channel configuration. |
| Shutdown Current | 1 μA max (VDD = 2.7–3.6 V) - extends battery life in PDA and wearable medical devices during idle periods. |
| SNR | 71 dB typ at 10 kHz - ensures clean digitization of low-amplitude physiological or sensor signals with minimal noise floor impact. |
| INL / DNL | ±1 LSB max (B grade) - guarantees monotonicity and no missing codes to 11 bits, critical for closed-loop control accuracy. |
Pinout & Package
AD7887BR-REEL is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), optimized for space-constrained PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select / Shutdown Enable | Active-low input initiating conversion and framing serial transfer; high state forces shutdown in Mode 1, reducing current to 1 μA. |
| VDD | Power Supply Input | Single 2.7–5.25 V rail powering analog and digital sections; serves as reference source in dual-channel mode. |
| GND | Analog Ground Reference | Common AGND connection point; requires tight coupling to system analog ground plane to minimize noise coupling. |
| AIN1/VREF | Configurable Terminal | In single-channel mode: 2.5 V reference output/input; in dual-channel mode: second analog input (0–VDD range). |
| AIN0 | Analog Input 0 | Primary input with range 0–VREF (single-channel) or 0–VDD (dual-channel); 20 pF input capacitance demands careful driver design. |
| DIN | Serial Data Input | Accepts 8-bit control register writes on SCLK rising edge; can be tied to GND for read-only single-channel operation. |
| DOUT | Serial Data Output | Outputs 16-bit frame (4 leading zeros + 12-bit result, MSB first) on SCLK falling edge; three-state capable. |
| SCLK | Serial Clock Input | 2 MHz max clock driving both interface timing and internal SAR conversion; defines throughput and acquisition timing. |
Key Features
| Feature | Design Value |
|---|---|
| Flexible channel configuration | Software-selectable single- or dual-channel mode via control register - eliminates hardware redesign when adding sensor channels. |
| Lowest-power 12-bit dual/single ADC | 2 mW typical at 5 V, 3 μW in shutdown - enables multi-year battery life in remote IoT sensors and handheld diagnostics. |
| Integrated 2.5 V reference | ±50 ppm/°C drift with 2.45–2.55 V output - removes need for external reference IC, saving BOM cost and board area. |
| SPI/QSPI/MICROWIRE/DSP compatibility | Standard serial protocol support - simplifies firmware integration with common microcontrollers (e.g., ADSP-21xx, ARM Cortex-M). |
| Automotive qualification | AEC-Q100 stress-tested for −40°C to +125°C operation - suitable for engine control, battery monitoring, and ADAS sensor front-ends. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Continuous acquisition of ECG, temperature, or blood oxygen analog signals in handheld patient monitors. IC Role / Device Role / Timing Role: Primary 12-bit SAR ADC performing synchronized sampling at 125 kSPS with internal 2.5 V reference for stable gain calibration. Use Value: Micropower shutdown (1 μA) extends single-battery operation beyond 6 months; MSOP package enables compact, lightweight enclosure design. |
Use Scenario: Long-term environmental sensing (temperature, humidity, pressure) in unattended field deployments. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing two independent sensors simultaneously using VDD-referenced inputs, minimizing external components. Use Value: Configurable power modes (Mode 3 auto-shutdown) reduce average current to <10 μA between samples, maximizing battery service life. |
| Industrial Sensor Signal Conditioning | High-Speed Modem Analog Front-End |
|
Use Scenario: Isolated analog input module for PLC I/O cards measuring 4–20 mA or thermocouple signals. IC Role / Device Role / Timing Role: Precision ADC interfacing with op-amp signal conditioning stage; INL ≤ ±1 LSB ensures accurate 16-bit-equivalent system linearity. Use Value: Channel-to-channel isolation >80 dB prevents crosstalk between multiplexed industrial sensor inputs, preserving measurement integrity. |
Use Scenario: Digitizing baseband analog signals in DSL or cable modem receivers prior to DSP processing. IC Role / Device Role / Timing Role: High-speed 125 kSPS ADC capturing 2.5 MHz full-power bandwidth signals with 71 dB SNR for clean spectral representation. Use Value: Straight binary output and SPI-compatible interface enable direct connection to ADSP-21xx or similar DSPs without glue logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7476ARTZ-REEL7 | 12-bit, 1 MSPS, 3.6 V max supply, no internal reference, 6-lead SOT-23 package | Higher speed but lacks dual-channel capability and internal reference - requires external REF and additional routing for multi-sensor use. | Select when throughput >125 kSPS is mandatory and board space is extremely constrained; not drop-in due to pin count and reference dependency. |
| ADS7822U | 12-bit, 200 kSPS, 2.7–5.25 V, internal reference, 8-lead SOIC (not MSOP), SPI-compatible | Same voltage and reference specs but larger SOIC footprint and higher typical IDD (1.2 mA vs. 0.85 mA) - less optimal for ultra-low-power portable designs. | Consider for legacy SOIC layouts where MSOP rework is prohibitive; verify thermal performance as θJA = 157°C/W (vs. 205.9°C/W for AD7887BR-REEL MSOP). |
Compared with AD7887BR-REEL, AD7476ARTZ-REEL7 trades dual-channel flexibility and internal reference for speed and size, while ADS7822U matches functionality but increases power and footprint - making AD7887BR-REEL optimal for space- and energy-constrained dual-sensor applications requiring automotive-grade reliability.
Availability
AD7887BR-REEL is available at Aetrix Electronics and suitable for battery-powered medical instruments, industrial sensor nodes, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7887BR-REEL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with R&D and manufacturing operations worldwide.
The AD7887 product line delivers micropower, multi-channel SAR ADCs for portable and automotive applications where precision, low power, and small footprint are essential - designed specifically to replace discrete reference + ADC solutions in space-sensitive systems.
FAQ
What is the maximum sampling rate supported by the AD7887BR-REEL?
The AD7887BR-REEL achieves a maximum throughput rate of 125 kSPS when operated with a 2 MHz SCLK and VDD between 2.7 V and 5.25 V. This rate includes both conversion time (14.5 SCLK cycles) and track/hold acquisition time (1.5 SCLK cycles), totaling 16 SCLK cycles per sample. Performance remains stable across the full industrial temperature range (−40°C to +125°C).
Does the AD7887BR-REEL include an internal voltage reference, and can it be disabled?
Yes, the AD7887BR-REEL integrates a 2.5 V internal reference with ±50 ppm/°C temperature coefficient and 2.45–2.55 V output range. It can be disabled via the REF bit (Bit 5) in the 8-bit control register: setting REF = 1 disconnects the internal reference, allowing an external voltage (1.2 V to VDD) to be applied to the AIN1/VREF pin for custom scaling - required for optimal performance in dual-channel mode.
How does the AD7887BR-REEL handle single-channel versus dual-channel operation?
The AD7887BR-REEL configures channel count via the SIN/DUAL bit (Bit 4) in its control register. When SIN/DUAL = 0, it operates in single-channel mode: AIN0 is active (0–VREF range), and AIN1/VREF functions as VREF. When SIN/DUAL = 1, it enters dual-channel mode: both AIN0 and AIN1 accept 0–VDD inputs, and VDD supplies the reference. The CH bit (Bit 3) then selects which channel converts next.
What power management modes are available on the AD7887BR-REEL, and how do they affect current draw?
The AD7887BR-REEL offers four programmable power modes controlled by PM1/PM0 bits. Mode 1 enables CS-triggered shutdown (1 μA). Mode 2 maintains full operation (850 μA typ). Mode 3 auto-enters shutdown post-conversion (12 μA typ at 1 kSPS). Mode 4 provides standby with reference active (210 μA typ). All modes retain register state and allow fast wake-up without reconfiguration.
Is the AD7887BR-REEL compatible with standard microcontroller serial interfaces?
Yes, the AD7887BR-REEL features a SPI/QSPI/MICROWIRE/DSP-compatible serial interface. It accepts 8-bit control words on DIN (SCLK rising edge) and outputs 16-bit results on DOUT (SCLK falling edge, MSB first), with CS framing. No special timing or protocol extensions are needed - it interoperates directly with STM32, PIC, ADSP, and other MCUs supporting standard 3-wire SPI configurations.
AD7887BR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 125k
- Number of Inputs:
- 1, 2
- Input Type:
- Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7887BR-REEL FAQ
1.How can I place an order for AD7887BR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7887BR-REEL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD7887BR-REEL reliable?
The price and inventory of AD7887BR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7887BR-REEL is usually 5 days.
3.What payment methods are accepted for AD7887BR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7887BR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7887BR-REEL?
AD7887BR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7887BR-REEL order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD7887BR-REEL?
For technical support, including AD7887BR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7887BR-REEL requirements.
6.How does Aetrix verify that AD7887BR-REEL is sourced from the original manufacturer or authorized distributors?
All AD7887BR-REEL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD7887BR-REEL meets industry standards.
7.What is the process for return or replacement of AD7887BR-REEL?
All AD7887BR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7887BR-REEL, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD7887BR-REEL part is unused and in its original packaging.
Return procedure for AD7887BR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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