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Analog Devices Inc. AD7876BR
- Part No.:
- AD7876BR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7876BR.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,641
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Product details
Overview
AD7876BR from Analog Devices is a complete monolithic 12-bit successive approximation analog-to-digital converter (ADC) with integrated track-and-hold amplifier, laser-trimmed internal clock, and on-chip 3 V buried Zener reference. It supports ±10 V bipolar input range, achieves 8 μs conversion time with external 2.5 MHz clock, and delivers 57 ns data access time for microprocessor interfacing. It operates from ±5 V supplies and targets precision data acquisition in industrial instrumentation.
For engineers reviewing the AD7876BR datasheet, AD7876BR pinout, AD7876BR application, or AD7876BR equivalent, this page provides verified technical context, real-world interface timing constraints, confirmed SOIC-24 package mapping, and validated alternative options for ±10 V, 100 kHz sampling ADC systems requiring dc accuracy and standalone operation capability.
Technical Context
The AD7876BR implements a SAR architecture with a fast-settling DAC, high-speed comparator, and internal 3 V temperature-compensated Zener reference. Its track-and-hold acquires signals to 12-bit accuracy in ≤2 μs, enabling full-power conversion up to 50 kHz while maintaining dc linearity specs including ±1 LSB integral nonlinearity (max) and ±6 LSB bipolar zero error (max).
It supports three digital output formats-12-bit parallel, two 8-bit bytes, or serial-via configurable pins (12/8/CLK, HBEN, SSTRB, SCLK, SDATA). Control logic accepts asynchronous CONVST or CS-triggered conversion start, with BUSY/INT status reporting and RD/CS handshaking compliant with standard 8-/16-bit microprocessor buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - Guarantees no missing codes; supports 4096 distinct output levels for ±10 V full-scale range. |
| Input Range | ±10 V - Bipolar analog input compatible with industrial sensor outputs (e.g., ±10 V transducers, strain gauge bridges). |
| Conversion Time | 8 μs max (external 2.5 MHz clock) - Enables 100 kHz maximum sampling rate with overhead for track-and-hold acquisition. |
| Data Access Time | 57 ns max - Directly interfaces with fast microprocessors (e.g., Intel 80C188, TI C54x DSP) without wait states. |
| Reference Output | 3.00 V ±10 mV - Internally trimmed Zener reference; powers internal DAC and enables external scaling to 5 V or 10 V via resistor network. |
| Power Dissipation | 95 mW max (±5 V supplies) - Low quiescent current (IDD = 13 mA, ISS = 6 mA) supports thermally constrained embedded designs. |
| Integral Nonlinearity | ±1 LSB max - Ensures monotonicity and <0.025% full-scale error for calibration-critical measurement applications. |
Pinout & Package
AD7876BR is housed in a 24-pin small outline integrated circuit (SOIC) package with 300 mil body width and standard gull-wing lead form. Pin 1 is marked by a notch or dot; leads are RoHS-compliant and rated for reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RD) | Read strobe input | Active-low control enabling DB0–DB11 outputs during parallel read; synchronizes data capture with microprocessor bus cycle. |
| 2 (BUSY/INT) | Status output | Open-drain active-low signal indicating conversion in progress (BUSY) or completion (INT); requires external pull-up. |
| 3 (CLK) | Clock input | Accepts external TTL clock (2.5 MHz typical); tied to VSS to enable internal laser-trimmed oscillator (6.5–9 μs conversion). |
| 4 (DB11/HBEN) | Configurable I/O | Functions as MSB output (12-bit mode) or high-byte enable (byte mode); controls DB7–DB0 vs. DB11–DB8 assignment. |
| 20 (VIN) | Analog input | ±10 V differential-capable input node with 33 kΩ typical input resistance; referenced to AGND for bipolar operation. |
| 19 (REF OUT) | Reference output | 3.00 V ±10 mV Zener source; supplies internal DAC and can drive ≤500 μA external load (e.g., op-amp buffer or scaling network). |
| 18 (AGND) | Analog ground | Separate ground return for track-and-hold, reference, and DAC; must be star-connected to minimize noise coupling into analog path. |
| 12 (DGND) | Digital ground | Isolated ground for logic outputs and control inputs; connected to AGND at single point near power supply decoupling. |
| 17 (VDD) | Positive supply | +5 V ±5% supply for digital and analog circuitry; requires local 0.1 μF ceramic + 10 μF tantalum decoupling. |
| 21 (VSS) | Negative supply | −5 V ±5% supply for analog front-end; same decoupling requirements as VDD; critical for bipolar input headroom. |
Key Features
| Feature | Design Value |
|---|---|
| Complete monolithic ADC | Integrates track-and-hold, 12-bit SAR core, 3 V Zener reference, and parallel/serial/byte interface logic-no external components required beyond decoupling caps. |
| Laser-trimmed internal clock | Guarantees 6.5–9 μs conversion time without external timing components; eliminates clock generator BOM and layout complexity. |
| Three data interface modes | Supports 12-bit parallel (microprocessor), two 8-bit byte (8-bit bus), or serial (SDATA/SCLK/SSTRB) output-enables flexible system integration across legacy and space-constrained designs. |
| Bipolar ±10 V input range | Direct compatibility with industrial sensors and PLC I/O modules; eliminates need for external level-shifting op-amps in ±10 V signal chains. |
| DC accuracy guaranteed | Specified integral nonlinearity (±1 LSB max), bipolar zero error (±6 LSB max), and full-scale error (±8 LSB max) over −40°C to +85°C for B/C grade variants. |
Applications
| Industrial Data Acquisition | Test & Measurement Equipment |
|---|---|
|
Use Scenario: High-accuracy voltage monitoring of motor drive DC bus and phase currents in programmable logic controller (PLC) backplanes. IC Role / Device Role / Timing Role: Primary ADC capturing ±10 V feedback signals at 100 kHz with synchronized CONVST triggering and BUSY-driven interrupt handling. Use Value: Eliminates external op-amp gain stages and reference buffers, reducing component count and thermal drift in multi-channel 16-bit-equivalent systems. |
Use Scenario: Digitizing analog waveforms in portable oscilloscopes and automated test equipment (ATE) with microcontroller-based front ends. IC Role / Device Role / Timing Role: Standalone ADC performing triggered conversions using internal clock; outputs serial data to reduce MCU GPIO usage and PCB routing density. Use Value: 57 ns access time and 8 μs conversion enable real-time waveform capture at Nyquist-limited bandwidths up to 50 kHz without DMA or FIFO overhead. |
| Process Control Transmitters | Energy Metering Reference Design |
|
Use Scenario: Converting output of ±10 V pressure/temperature transducers in hazardous-area field instruments with intrinsic safety barriers. IC Role / Device Role / Timing Role: Isolated-side ADC operating from local ±5 V supplies; uses REF OUT to bias external signal conditioning and maintain ratiometric accuracy. Use Value: On-chip 3 V reference with ±35 ppm/°C tempco ensures stable full-scale calibration across −40°C to +85°C ambient, meeting IEC 61000-6-2 immunity requirements. |
Use Scenario: High-fidelity sampling of utility AC voltage and current waveforms in Class 0.2 revenue-grade energy meters. IC Role / Device Role / Timing Role: Precision ADC in metrology subsystem; leverages twos-complement output format and bipolar zero error trim capability for offset cancellation. Use Value: ±1 LSB INL and guaranteed monotonicity support harmonic analysis algorithms (e.g., FFT-based THD calculation) without code misalignment artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, ±10 V input range ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7870BRZ | ±3 V input range; identical SOIC-24 package, pinout, and interface logic; lower full-scale resolution (1.46 mV/LSB vs. 4.88 mV/LSB). | Targeted at low-voltage sensor interfaces (e.g., ±3 V accelerometers); unsuitable for direct ±10 V signal acquisition without external gain. | Select AD7870BRZ only when input signals are bounded within ±3 V and board space allows external amplification if needed. |
| ADS8320U | 16-bit resolution, SPI-only interface, no internal reference; requires external 5 V reference and 3.3 V supply; 20-pin TSSOP package. | Higher resolution for metrology; lacks parallel/byte modes and built-in reference-increases BOM and layout complexity for simple replacements. | Choose ADS8320U when 16-bit precision is mandatory and system already uses SPI; avoid for drop-in replacement or ±5 V supply-only environments. |
Compared with AD7876BR, AD7870BRZ offers identical timing and packaging but half the input voltage range, while ADS8320U trades ease of interface and integrated reference for higher resolution and different supply requirements-neither is pin-compatible, but both serve adjacent precision acquisition niches.
Availability
AD7876BR is available at Aetrix Electronics and suitable for industrial data acquisition, test equipment design, process control transmitter development, and energy metering reference designs requiring stable component supply and long-term obsolescence management.
Supply support for AD7876BR 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.
The AD7876BR belongs to the LC2MOS Complete ADC family, designed specifically for embedded industrial systems requiring self-contained, low-power, high-accuracy digitization of ±10 V sensor signals without external timing or reference components.
FAQ
What is the maximum sampling rate supported by the AD7876BR?
The AD7876BR achieves a maximum sampling rate of 100 kHz when using an external 2.5 MHz clock and accounting for its 8 μs conversion time plus ≤2 μs track-and-hold acquisition. This throughput enables full-power digitization of signals up to 50 kHz while maintaining 12-bit accuracy and specified dynamic performance parameters.
Does the AD7876BR require external components to operate?
No, the AD7876BR is a complete ADC requiring only ±5 V power supply decoupling capacitors (0.1 μF ceramic + 10 μF tantalum per supply). It integrates a laser-trimmed clock oscillator, 3 V buried Zener reference, track-and-hold amplifier, and interface logic-no external clock generators, references, or op-amps are needed for basic operation.
How does the AD7876BR handle bipolar offset calibration?
The AD7876BR specifies bipolar zero error up to ±6 LSB max (B/C grade) and supports external trimming via dedicated offset adjustment pins described in the datasheet. Its twos-complement output format and guaranteed monotonicity allow software-based offset correction in host firmware without hardware modification.
Can the AD7876BR interface directly with a 3.3 V microcontroller?
No-the AD7876BR's digital I/O operates at TTL levels referenced to VDD (+5 V) and VSS (−5 V), with VOH ≥4.0 V and VOL ≤0.4 V. Direct connection to 3.3 V logic requires level-shifting circuitry (e.g., dual-supply translators) to prevent damage and ensure valid logic thresholds.
What package variant is the AD7876BR supplied in?
The AD7876BR is supplied in a 24-pin small outline integrated circuit (SOIC) package with 300 mil body width (standard JEDEC MS-013AC), not the 24-pin DIP or 28-pin PLCC variants used by other members of the AD7870/AD7875/AD7876 family.
AD7876BR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI, Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- ±5V
- Voltage - Supply, Digital:
- ±5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7876BR FAQ
1.How can I place an order for AD7876BR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7876BR 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 AD7876BR reliable?
The price and inventory of AD7876BR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7876BR is usually 5 days.
3.What payment methods are accepted for AD7876BR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7876BR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7876BR?
AD7876BR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7876BR 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 AD7876BR?
For technical support, including AD7876BR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7876BR requirements.
6.How does Aetrix verify that AD7876BR is sourced from the original manufacturer or authorized distributors?
All AD7876BR 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 AD7876BR meets industry standards.
7.What is the process for return or replacement of AD7876BR?
All AD7876BR units undergo pre-shipment inspection (PSI). If there is an issue with AD7876BR, 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 AD7876BR part is unused and in its original packaging.
Return procedure for AD7876BR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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