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Analog Devices Inc. AD7887BRZ-REEL
- Part No.:
- AD7887BRZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7887BRZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,283
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Product details
Overview
AD7887BRZ-REEL from Analog Devices is a micropower, 12-bit successive approximation register (SAR) ADC with dual/single-channel configuration, 125 kSPS throughput, 2.7 V to 5.25 V single-supply operation, and MSOP-8 package. It features internal 2.5 V reference, SPI/QSPI/MICROWIRE/DSP-compatible serial interface, and 1 μA shutdown current - ideal for battery-powered medical instruments and portable data acquisition.
For engineers reviewing the AD7887BRZ-REEL datasheet, AD7887BRZ-REEL pinout, AD7887BRZ-REEL application, or AD7887BRZ-REEL equivalent, key selection criteria include configurable single/dual-channel mode, 0–VREF or 0–VDD input range flexibility, guaranteed no missing codes (11-bit), and automotive-qualified 8-lead MSOP packaging.
Technical Context
The AD7887BRZ-REEL implements a charge-redistribution SAR architecture with integrated track-and-hold, acquiring signals in 500 ns. Its control logic supports four power management modes via PM1/PM0 bits, enabling automatic shutdown after conversion (Mode 3) or standby with reference active (Mode 4).
It operates in two distinct analog input configurations: single-channel mode (AIN0 only, AIN1/VREF as 2.5 V reference output or external reference input) and dual-channel mode (AIN0 and AIN1 both active, reference derived from VDD). The straight binary output coding and 16-cycle serial frame (4 leading zeros + 12-bit result) ensure deterministic timing alignment with microcontroller SPI peripherals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step, supporting precise measurement of sub-millivolt signal changes. |
| Throughput Rate | 125 kSPS - enables real-time sampling of up to 2.5 MHz full-power bandwidth signals without aliasing in baseband applications. |
| Supply Voltage | 2.7 V to 5.25 V - allows direct interfacing with 3 V and 5 V logic systems without level-shifting or auxiliary regulators. |
| SNR @ 10 kHz | 71 dB typ - ensures >11.5 effective number of bits (ENOB) for high-fidelity sensor signal digitization. |
| Shutdown Current | 1 μA max - reduces system quiescent power by >99% during idle periods in portable PDA or wearable medical devices. |
| Input Range (Dual) | 0 V to VDD - eliminates need for external scaling when measuring rail-referenced industrial sensor outputs. |
| Reference Source | Internal 2.5 V ±50 ppm/°C or external 1.2 V to VDD - provides stable calibration anchor or flexibility for ratiometric transducer interfaces. |
Pinout & Package
AD7887BRZ-REEL is housed in an 8-lead, 3 mm × 3 mm, 0.65 mm pitch MSOP package (JEDEC MO-187AA), optimized for space-constrained PCB layouts and qualified for automotive temperature range (−40°C to +125°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CS | Chip Select / Shutdown Control | Active-low input that initiates conversion and frames serial data; high state forces shutdown in Mode 1, enabling ultra-low-power wake-on-convert operation. |
| 2 - VDD | Power Supply Input | Single 2.7–5.25 V supply powers analog core, digital interface, and (in dual-channel mode) serves as ADC reference source. |
| 3 - GND | Analog Ground Reference | Primary ground return for all internal circuitry; must be tied to system AGND plane to minimize noise coupling into SAR conversion. |
| 4 - AIN1/VREF | Configurable Terminal | In single-channel mode: 2.5 V reference output or external reference input (1.2–VDD); in dual-channel mode: second analog input (0–VDD range). |
| 5 - AIN0 | Analog Input 0 | Main input channel with 0–VREF (single) or 0–VDD (dual) range; 20 pF input capacitance requires careful layout to avoid sampling error. |
| 6 - 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. |
| 7 - DOUT | Serial Data Output | Outputs 16-bit frame (4 leading zeros + 12-bit result, MSB first) on SCLK falling edge; three-state capable for bus sharing. |
| 8 - SCLK | Serial Clock Input | Drives both digital interface and internal ADC conversion clock; supports up to 2 MHz, defining minimum 16-cycle conversion time. |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Channel Configuration | Software-selectable single- or dual-channel mode via control register bit SIN/DUAL - eliminates hardware redesign when scaling sensor count. |
| Low-Power Management | Four programmable power modes including auto-shutdown (Mode 3) and standby with reference active (Mode 4) - enables dynamic power scaling per sample rate demand. |
| Read-Only Operation | DIN tied to GND configures default single-channel mode without control register writes - simplifies firmware and reduces MCU GPIO usage. |
| Automotive-Qualified Packaging | MSOP-8 package qualified per AEC-Q100 Grade 1 - supports deployment in engine control, body electronics, and ADAS sensor front-ends. |
| SPI-Compatible Interface | Fully compatible with SPI, QSPI, MICROWIRE, and DSP serial protocols - enables drop-in integration with existing microcontroller peripheral drivers. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Continuous ECG waveform digitization in handheld patient monitors with 72-hour battery life. IC Role / Device Role / Timing Role: Dual-channel ADC simultaneously samples lead I and lead II analog inputs at 125 kSPS with synchronized 16-cycle serial framing. Use Value: 1 μA shutdown current extends battery runtime; internal 2.5 V reference ensures consistent gain calibration across temperature without external components. |
Use Scenario: Environmental sensor node recording temperature, humidity, and pressure over weeks on coin-cell power. IC Role / Device Role / Timing Role: Single-channel ADC reads conditioned analog outputs in burst mode, entering shutdown between samples. Use Value: Configurable power modes reduce average current to <10 μA; 2.7 V minimum supply enables direct use of aging Li-MnO₂ cells. |
| Industrial Process Monitoring | Automotive Body Control Modules |
|
Use Scenario: 4–20 mA loop-powered transmitter digitizing thermocouple and RTD signals in factory automation cabinets. IC Role / Device Role / Timing Role: Dual-channel ADC converts isolated analog inputs referenced to local VDD, using AIN1/VREF as second input. Use Value: 0–VDD input range accepts rail-to-rail sensor outputs; −80 dB channel-to-channel isolation prevents crosstalk in multi-sensor assemblies. |
Use Scenario: Cabin air quality sensor subsystem detecting CO₂, VOCs, and particulate matter in automotive HVAC control units. IC Role / Device Role / Timing Role: Single-channel ADC acquires filtered analog outputs from NDIR and electrochemical sensors under AEC-Q100 conditions. Use Value: Automotive-qualified MSOP-8 package withstands thermal cycling and vibration; 71 dB SNR maintains resolution despite engine bay EMI. |
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 |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200 kSPS, 2.7–5.5 V supply, SO-8 package - lacks internal reference and dual-channel capability. | Targeted at cost-sensitive, lower-accuracy industrial controls where 12-bit precision is unnecessary. | Select ADS7822U only if 8-bit resolution suffices and external reference design is acceptable. |
| MAX11100ETE+ | 12-bit, 250 kSPS, 2.7–3.6 V supply, 12-lead TDFN - higher speed but narrower voltage range and no automotive qualification. | Suited for high-speed portable test equipment powered exclusively by 3.3 V rails. | Choose MAX11100ETE+ only when >125 kSPS is required and automotive temperature range is not needed. |
Compared with ADS7822U and MAX11100ETE+, the AD7887BRZ-REEL uniquely combines 12-bit accuracy, dual/single configurability, internal reference, and AEC-Q100 qualification in an 8-lead MSOP - making it the sole option for space-constrained, battery-powered automotive and medical designs requiring guaranteed 11-bit monotonicity.
Availability
AD7887BRZ-REEL is available at Aetrix Electronics and suitable for battery-powered medical instrumentation, portable environmental data loggers, industrial process monitoring transmitters, and automotive cabin air quality sensor modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7887BRZ-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 design centers worldwide and a legacy of precision data conversion innovation since 1965.
The AD7887 product line was engineered specifically for ultra-low-power, space-constrained, single-supply data acquisition in portable and automotive environments - emphasizing micropower operation, flexible channel architecture, and robust serial interfacing without external support components.
FAQ
What is the maximum sampling rate supported by the AD7887BRZ-REEL?
The AD7887BRZ-REEL achieves a maximum throughput rate of 125 kSPS when operated with a 2 MHz SCLK. This corresponds to a total conversion time of 16 SCLK cycles (14.5 for conversion + 1.5 for track/hold acquisition), delivering deterministic timing for real-time control loops and waveform capture in portable instrumentation.
Does the AD7887BRZ-REEL require an external reference voltage?
No - the AD7887BRZ-REEL integrates a precision 2.5 V reference with ±50 ppm/°C temperature coefficient, accessible at the AIN1/VREF pin in single-channel mode. An external reference (1.2 V to VDD) may be applied to this pin to override the internal reference, enabling ratiometric measurements or custom full-scale ranges.
How does the AD7887BRZ-REEL handle dual-channel versus single-channel operation?
The AD7887BRZ-REEL uses the SIN/DUAL bit (Bit 4) in its 8-bit control register to select mode: SIN/DUAL = 0 configures single-channel operation (AIN0 only, AIN1/VREF as VREF), while SIN/DUAL = 1 enables dual-channel mode (AIN0 and AIN1 active, reference sourced from VDD). Default power-up state is single-channel read-only mode.
What power management modes are available on the AD7887BRZ-REEL?
The AD7887BRZ-REEL offers four programmable power modes via PM1/PM0 bits: Mode 1 (CS-controlled shutdown), Mode 2 (always-on), Mode 3 (auto-shutdown after conversion), and Mode 4 (standby with reference active). Mode 3 reduces average current to 12 μA at 1 kSPS, critical for extending battery life in intermittent-sampling applications.
Is the AD7887BRZ-REEL compatible with standard SPI microcontrollers?
Yes - the AD7887BRZ-REEL's serial interface is fully compatible with SPI, QSPI, MICROWIRE, and DSP protocols. It uses CS-active-low framing, SCLK-driven data transfer (DIN on rising edge, DOUT on falling edge), and outputs a 16-bit word (4 leading zeros + 12-bit result, MSB first), allowing seamless integration with common MCU SPI peripherals without protocol translation.
AD7887BRZ-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:
- Active
- 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:
- -
AD7887BRZ-REEL FAQ
1.How can I place an order for AD7887BRZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7887BRZ-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 AD7887BRZ-REEL reliable?
The price and inventory of AD7887BRZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7887BRZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7887BRZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7887BRZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7887BRZ-REEL?
AD7887BRZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7887BRZ-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 AD7887BRZ-REEL?
For technical support, including AD7887BRZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7887BRZ-REEL requirements.
6.How does Aetrix verify that AD7887BRZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7887BRZ-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 AD7887BRZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7887BRZ-REEL?
All AD7887BRZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7887BRZ-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 AD7887BRZ-REEL part is unused and in its original packaging.
Return procedure for AD7887BRZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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