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Analog Devices Inc. AD7887BRZ
- Part No.:
- AD7887BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7887BRZ.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,394
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Product details
Overview
AD7887BRZ from Analog Devices is a micropower, 12-bit successive approximation register (SAR) ADC supporting single- or dual-channel operation at up to 125 kSPS, with 2.7 V to 5.25 V supply voltage, 2.5 V internal reference, and MSOP-8 package. It delivers 71 dB SNR at 10 kHz input and ±1 LSB differential nonlinearity (B grade), targeting battery-powered instrumentation and portable medical devices.
For engineers reviewing the AD7887BRZ datasheet, AD7887BRZ pinout, AD7887BRZ application, or AD7887BRZ equivalent, key selection criteria include its flexible power management (1 μA shutdown), SPI/QSPI/MICROWIRE-compatible serial interface, dual-mode analog input configuration (0–VREF or 0–VDD), and automotive-qualified 8-lead MSOP packaging.
Technical Context
The AD7887BRZ implements a charge-redistribution SAR architecture with integrated track-and-hold, acquiring signals in 500 ns. Its control register enables runtime configuration of channel count (single/dual), reference source (internal 2.5 V or external 1.2–VDD), and power mode (shutdown, standby, or full operation).
It supports straight binary output coding, features CMOS logic compatible with 2.7–5.25 V supplies, and provides channel-to-channel isolation of −80 dB at 25 kHz. The AIN1/VREF pin serves as either second analog input or reference I/O depending on SIN/DUAL bit setting - no hardware reconfiguration required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital levels for high-fidelity signal digitization |
| Throughput Rate | 125 kSPS - supports real-time sampling of baseband signals up to 2.5 MHz full-power bandwidth |
| Supply Voltage | 2.7 V to 5.25 V - operates directly from single Li-ion or regulated 3.3 V/5 V rails without level-shifting |
| SNR @ 10 kHz | 71 dB typ - enables accurate measurement of low-amplitude signals in noisy environments |
| Shutdown Current | 1 μA max - extends battery life in intermittent-sampling applications like portable data loggers |
| Differential Nonlinearity | ±1 LSB max (B grade) - guarantees monotonicity and absence of missing codes up to 11 bits |
| Reference | Internal 2.5 V ±50 ppm/°C - eliminates need for external reference in cost-sensitive designs |
Pinout & Package
AD7887BRZ 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 Control | Active-low input that initiates conversion and frames serial data; high state forces shutdown mode in default configuration |
| VDD | Power Supply Input | Single 2.7–5.25 V supply rail; also serves as reference source in dual-channel mode |
| GND | Analog Ground Reference | Common return for analog circuitry; must be tied to AGND plane per layout best practices |
| 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 analog input; range = 0 to VREF (single-channel) or 0 to VDD (dual-channel) |
| 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 leading zeros + 12-bit result, MSB first) on SCLK falling edge |
| SCLK | Serial Clock Input | Provides timing for both data transfer and internal ADC conversion; supports up to 2 MHz clock rate |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Channel Configuration | Runtime-selectable single- or dual-channel mode via control register - eliminates need for board variants |
| Ultra-Low Power Shutdown | 1 μA max current draw in shutdown - reduces quiescent load by >99% vs. active mode (850 μA typ) |
| Integrated Reference | Stable 2.5 V ±50 ppm/°C output - removes external reference IC and associated decoupling components |
| Microprocessor-Compatible Interface | SPI/QSPI/MICROWIRE/DSP protocol support - interfaces directly with common MCU peripherals without glue logic |
| Automotive-Qualified Packaging | MSOP-8 qualified per AEC-Q100 - suitable for under-hood and infotainment subsystems requiring extended temperature operation |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Acquisition |
|---|---|
Use Scenario: Continuous ECG waveform capture in handheld patient monitors with 24-hour battery life. IC Role / Device Role / Timing Role: ADC digitizes analog front-end outputs at 125 kSPS with 12-bit resolution and 71 dB SNR. Use Value: Micropower shutdown mode (1 μA) minimizes idle current; internal 2.5 V reference ensures stable scaling without external components. | Use Scenario: Environmental sensor node logging temperature, pressure, and humidity using intermittent sampling. IC Role / Device Role / Timing Role: Dual-channel ADC acquires two analog sensors simultaneously with channel-to-channel isolation >80 dB. Use Value: Configurable 0–VDD input range simplifies sensor interfacing; automatic power-down after conversion extends battery life. |
| Industrial Handheld Test Equipment | Automotive Diagnostic Tools |
Use Scenario: Multifunction calibrator measuring mA loop signals and thermocouple outputs in field service tools. IC Role / Device Role / Timing Role: Single-channel mode with overdrivable VREF pin accepts 1.2–5.25 V external references for wide-range signal conditioning. Use Value: ±1 LSB DNL (B grade) ensures monotonic response across full scale; SPI interface enables fast MCU polling. | Use Scenario: OBD-II scan tool monitoring engine coolant temperature and throttle position in vehicles. IC Role / Device Role / Timing Role: Automotive-qualified ADC samples analog sensor outputs across −40°C to +125°C ambient range. Use Value: MSOP-8 package withstands thermal cycling; internal reference stability (±50 ppm/°C) maintains accuracy over vehicle operating conditions. |
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 | Single-channel only; 1 MSPS max; no internal reference; 6-lead SOT-23 package | Lacks dual-channel capability and integrated reference; suited for higher-speed, space-constrained single-input systems | Select when throughput >125 kSPS is required and external reference is acceptable |
| ADS7822U | 2.7 V–5.25 V supply; 125 kSPS; 8-lead SOIC; no internal reference; requires external 2.5 V ref | Same speed and supply range but lacks on-chip reference and automotive qualification | Choose when SOIC footprint is preferred and reference sourcing is already centralized |
Compared with AD7887BRZ, AD7476ARTZ-REEL7 offers higher speed but sacrifices dual-channel flexibility and reference integration, while ADS7822U matches throughput and supply but adds BOM complexity with external reference dependency and lacks AEC-Q100 compliance.
Availability
AD7887BRZ is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data acquisition, industrial handheld test equipment, and automotive diagnostic tools requiring stable component supply across extended temperature ranges.
Supply support for AD7887BRZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD7887 product line delivers micropower, multi-channel SAR ADCs optimized for battery-operated instrumentation, portable medical devices, and automotive sensor interfaces where size, power, and precision are critical.
FAQ
What is the maximum sampling rate supported by the AD7887BRZ?
The AD7887BRZ supports a maximum throughput rate of 125 kSPS when operated with a 2 MHz SCLK. This corresponds to a total conversion time plus acquisition time of 16 SCLK cycles, enabling real-time digitization of signals with up to 2.5 MHz full-power bandwidth. The part maintains specified DC accuracy and dynamic performance (71 dB SNR) at this rate across its full operating temperature range.
Does the AD7887BRZ include an internal voltage reference?
Yes, the AD7887BRZ integrates a precision 2.5 V voltage reference with ±50 ppm/°C temperature coefficient. This reference is accessible via the AIN1/VREF pin in single-channel mode and can be overdriven by an external source between 1.2 V and VDD. In dual-channel mode, the internal reference is disabled and VDD serves as the reference source, making the AD7887BRZ adaptable to both reference-integrated and reference-flexible system architectures.
How does the AD7887BRZ handle dual-channel versus single-channel operation?
The AD7887BRZ configures channel count via the SIN/DUAL bit in its 8-bit control register. When set to 0, it operates in single-channel mode: AIN0 is the sole analog input (0–VREF range), and AIN1/VREF functions as the reference terminal. When set to 1, it enters dual-channel mode: both AIN0 and AIN1 accept inputs (0–VDD range), and VDD becomes the reference source. This software-selectable duality eliminates hardware redesign for varying channel requirements.
What power management modes are available on the AD7887BRZ?
The AD7887BRZ offers four programmable power modes controlled by PM1/PM0 bits: Mode 1 (CS-gated shutdown), Mode 2 (always-on), Mode 3 (auto-shutdown post-conversion), and Mode 4 (standby with reference active). Shutdown current is 1 μA max, standby draws 210 μA, and normal operation consumes 850 μA typ at 125 kSPS. These options allow precise trade-offs between wake-up latency and energy efficiency in duty-cycled applications.
Is the AD7887BRZ suitable for automotive applications?
Yes, the AD7887BRZ is qualified for automotive applications per AEC-Q100 standards, rated for operation from −40°C to +125°C. Its MSOP-8 package, robust ESD protection (4 kV HBM), and stable performance across voltage (2.7–5.25 V) and temperature make it appropriate for engine control, cabin sensing, and diagnostic tools. The internal 2.5 V reference's ±50 ppm/°C drift ensures consistent ADC scaling under thermal stress.
AD7887BRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for AD7887BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7887BRZ 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 reliable?
The price and inventory of AD7887BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7887BRZ is usually 5 days.
3.What payment methods are accepted for AD7887BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7887BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7887BRZ?
AD7887BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7887BRZ 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?
For technical support, including AD7887BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7887BRZ requirements.
6.How does Aetrix verify that AD7887BRZ is sourced from the original manufacturer or authorized distributors?
All AD7887BRZ 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 meets industry standards.
7.What is the process for return or replacement of AD7887BRZ?
All AD7887BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7887BRZ, 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 part is unused and in its original packaging.
Return procedure for AD7887BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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