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Analog Devices Inc. AD7887BR
- Part No.:
- AD7887BR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7887BR.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,858
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Product details
Overview
AD7887BR from Analog Devices is a micropower, 12-bit successive-approximation ADC with dual/single-channel operation, 125 kSPS throughput, 2.7 V to 5.25 V single-supply operation, and SPI/QSPI/MICROWIRE-compatible serial interface - used in battery-powered medical instruments and portable instrumentation.
For engineers reviewing the AD7887BR datasheet, AD7887BR pinout, AD7887BR application, or AD7887BR equivalent, key selection criteria include its 8-lead MSOP package, 1 μA shutdown current, 2.5 MHz full-power bandwidth, flexible reference configuration (internal 2.5 V or external 1.2 V–VDD), and channel-to-channel isolation of −80 dB at 25 kHz.
Technical Context
The AD7887BR implements a charge-redistribution SAR architecture with integrated track-and-hold, acquiring signals in 500 ns. Its control register enables software-selectable single/dual-channel mode, reference source (internal 2.5 V or external), and four power management modes including automatic shutdown post-conversion.
It supports straight binary output coding, 0 V to VREF input range in single-channel mode, and 0 V to VDD range in dual-channel mode. The serial interface operates with SCLK up to 2 MHz, outputs 16-bit frames (4 leading zeros + 12-bit result), and clocks data on falling SCLK edges while accepting control bits on rising edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step for precision measurement |
| Throughput Rate | 125 kSPS - enables real-time sampling of signals up to 2.5 MHz (Nyquist-limited) |
| Supply Voltage | 2.7 V to 5.25 V - supports direct interfacing with 3 V and 5 V logic/system rails |
| Shutdown Current | 1 μA max - extends battery life in intermittent-sampling portable systems |
| SNR | 71 dB typ at 10 kHz - ensures >11.5 effective bits for clean signal acquisition |
| Channel Isolation | −80 dB at 25 kHz - prevents crosstalk between AIN0 and AIN1 in dual-channel use |
| Reference Options | Internal 2.5 V ±50 ppm/°C or external 1.2 V to VDD - allows flexible scaling without external reference IC |
Pinout & Package
The AD7887BR is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch) with exposed pad for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select / Shutdown Control | Active-low input that initiates conversion and frames serial transfer; high state forces shutdown (1 μA) in default mode |
| VDD | Power Supply Input | Single 2.7 V–5.25 V supply; provides reference voltage for ADC in dual-channel mode |
| GND | Analog Ground Reference | Common AGND connection point; requires low-impedance tie to system analog ground plane |
| 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 | Main input channel; range = 0 to VREF (single-mode) or 0 to VDD (dual-mode) |
| DIN | Serial Data Input | Accepts 8-bit control register writes on SCLK rising edge; can be tied to GND for read-only operation |
| DOUT | Serial Data Output | Outputs 16-bit frame (4 zeros + 12-bit result, MSB first) on SCLK falling edge |
| SCLK | Serial Clock Input | Provides clock for both serial communication and internal ADC conversion timing (up to 2 MHz) |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Channel Configuration | Software-selectable single- or dual-channel mode via 8-bit control register, enabling hardware reuse across sensor-count variants |
| Ultra-Low Power Management | Four programmable power modes including auto-shutdown after conversion, reducing average power in burst-sampling applications |
| Integrated Reference Architecture | On-chip 2.5 V reference with ±50 ppm/°C drift and external overdrive capability (1.2 V–VDD), eliminating need for discrete reference IC |
| SPI-Compatible Serial Interface | 16-bit frame format (4 leading zeros + 12-bit result), MSB-first, compatible with standard microcontroller SPI peripherals without glue logic |
| High-Speed Track-and-Hold | 500 ns acquisition time enables accurate sampling of fast transients and wideband signals up to 2.5 MHz full-power bandwidth |
Applications
| Portable Medical Sensors | Battery-Powered PDAs |
|---|---|
Use Scenario: Continuous ECG waveform digitization in handheld diagnostic devices with strict battery life targets. IC Role / Device Role / Timing Role: Primary 12-bit ADC capturing analog biopotential signals at ≥1 kSPS with minimal quiescent current. Use Value: 1 μA shutdown current and automatic power-down mode extend coin-cell battery life to >1 year in sleep-wake cycles. | Use Scenario: Multi-sensor data logging (temperature, pressure, acceleration) in personal digital assistants. IC Role / Device Role / Timing Role: Dual-channel ADC sampling two analog sensors alternately using CH bit control in single 2.7 V supply system. Use Value: Channel-to-channel isolation of −80 dB prevents cross-coupling between sensor readings, ensuring independent accuracy. |
| Industrial Field Transmitters | High-Speed Modem Front-Ends |
Use Scenario: 4–20 mA loop-powered sensor transmitter requiring low-voltage, low-power signal conditioning. IC Role / Device Role / Timing Role: Single-channel ADC with external 2.5 V reference, operating from 3.3 V rail with tight thermal budget. Use Value: 2.1 mW normal-mode power dissipation at 3 V enables full functionality within 30 mW loop power envelope. | Use Scenario: Analog front-end for V.34/V.90 modem line interface, digitizing filtered audio-band signals. IC Role / Device Role / Timing Role: High-SNR ADC sampling at 125 kSPS with 71 dB SNR to preserve dynamic range in noisy telecom environments. Use Value: 71 dB SNR at 10 kHz meets ITU-T G.712 requirements for voiceband signal fidelity without oversampling. |
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 dual-channel mode, no internal reference | Higher speed but lacks flexible reference and multi-channel support; requires external reference and level-shifting for 5 V systems | Select when throughput >125 kSPS is critical and dual-channel operation is unnecessary |
| ADS7822U | 12-bit, 200 kSPS, 2.7–5.25 V, SPI interface, no internal reference, 8-pin SOIC only | Higher throughput and identical supply range, but requires external 2.5 V reference and offers no MSOP option | Select when board space allows SOIC and external reference design is already established |
Compared with AD7887BR, AD7476ARTZ-REEL7 trades dual-channel flexibility and integrated reference for higher speed, while ADS7822U matches supply range and throughput but adds external reference dependency and excludes MSOP packaging - making AD7887BR optimal for compact, low-power, multi-sensor designs needing reference integration.
Availability
AD7887BR is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable instrumentation, and industrial field transmitters requiring stable component supply across automotive-grade temperature ranges (−40°C to +125°C).
Supply support for AD7887BR 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.
The AD7887BR belongs to Analog Devices' precision SAR ADC product line, engineered for ultra-low-power, high-accuracy data acquisition in space- and energy-constrained portable and industrial systems.
FAQ
What is the maximum sampling rate supported by the AD7887BR?
The AD7887BR supports a maximum throughput rate of 125 kSPS when operated with a 2 MHz SCLK. This rate is achieved with a total conversion time of 14.5 SCLK cycles plus 1.5 SCLK cycles for track-and-hold acquisition, totaling 16 SCLK cycles per sample. At 2 MHz, this yields exactly 125,000 samples per second, confirmed in Table 1 and General Description section of the Rev. E datasheet.
Does the AD7887BR include an internal voltage reference?
Yes, the AD7887BR integrates a 2.5 V internal reference with ±50 ppm/°C temperature coefficient, accessible at the AIN1/VREF pin in single-channel mode. When enabled (REF bit = 0), it provides stable scaling for AIN0; when disabled (REF bit = 1), the pin serves as AIN1 in dual-channel mode or accepts external references from 1.2 V to VDD - a capability explicitly defined in Pin Function Descriptions and Control Register sections.
Can the AD7887BR operate in a read-only configuration without using the DIN pin?
Yes, the AD7887BR supports true read-only operation: tying the DIN pin permanently to GND configures it as a single-channel, fixed-mode ADC that requires no control register writes. In this mode, it defaults to single-channel operation with internal reference enabled, outputting conversion results continuously upon CS assertion - a feature documented in the General Description and Control Register sections of the datasheet.
What are the power consumption characteristics of the AD7887BR in shutdown mode?
In shutdown mode (PM1/PM0 = 00 or 11), the AD7887BR draws ≤1 μA at 2.7–3.6 V and ≤2 μA at 4.75–5.25 V, with corresponding power dissipation of ≤5 μW at 5 V and ≤3 μW at 3 V. These values are specified in the POWER REQUIREMENTS table (Page 4) and verified across −40°C to +125°C, making it suitable for long-duration battery standby applications.
Is the AD7887BR pin-compatible with other members of the AD7887 family?
Yes, the AD7887BR shares identical pinout and function mapping with all AD7887 variants (e.g., AD7887AR, AD7887BN), including the 8-lead MSOP and SOIC packages. Pin configurations in Figures 3 and 4, along with Table 4's function descriptions, confirm consistent CS/VDD/GND/AIN1-VREF/AIN0/DIN/DOUT/SCLK assignment across all versions - enabling drop-in replacement within the same package type.
AD7887BR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for AD7887BR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7887BR 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 reliable?
The price and inventory of AD7887BR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7887BR is usually 5 days.
3.What payment methods are accepted for AD7887BR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7887BR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7887BR?
AD7887BR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7887BR 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?
For technical support, including AD7887BR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7887BR requirements.
6.How does Aetrix verify that AD7887BR is sourced from the original manufacturer or authorized distributors?
All AD7887BR 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 meets industry standards.
7.What is the process for return or replacement of AD7887BR?
All AD7887BR units undergo pre-shipment inspection (PSI). If there is an issue with AD7887BR, 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 part is unused and in its original packaging.
Return procedure for AD7887BR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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