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Analog Devices Inc. AD7876BR-REEL7
- Part No.:
- AD7876BR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7876BR-REEL7.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,828
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Product details
Overview
AD7876BR-REEL7 from Analog Devices is a complete monolithic 12-bit successive approximation ADC with integrated track-and-hold amplifier, laser-trimmed internal clock, and on-chip 3 V buried Zener reference. It supports ±10 V bipolar analog input range, achieves 8 μs conversion time with external 2.5 MHz clock, and delivers 57 ns data access time for microprocessor interfacing in industrial data acquisition systems.
For engineers reviewing the AD7876BR-REEL7 datasheet, AD7876BR-REEL7 pinout, AD7876BR-REEL7 application, or AD7876BR-REEL7 equivalent, this page provides verified technical context, real-world interface timing constraints, confirmed SOIC-24 package mapping, and validated alternative options for ±10 V input-range 12-bit sampling ADCs requiring stable dc accuracy and microprocessor-compatible parallel/serial output formats.
Technical Context
The AD7876BR-REEL7 implements a SAR architecture with a fast-settling DAC, high-speed comparator, and internal 3 V temperature-compensated Zener reference trimmed to ±10 mV. 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 (±1 LSB INL max) and bipolar zero error (±6 LSB max).
It operates from dual ±5 V supplies and supports three digital interface modes: 12-bit parallel, two-byte (8-bit) parallel, and serial (SDATA/SCLK/SSTRB). The 12/8/CLK pin selects format and controls SCLK gating; HBEN enables high/low byte selection; BUSY/INT provides asynchronous status signaling without requiring external handshaking logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes; supports 4096 discrete output levels for precise amplitude quantization. |
| Input Range | ±10 V - enables direct digitization of industrial sensor outputs (e.g., ±10 V strain gauge bridges) without external scaling. |
| Conversion Time | 8 μs max (external 2.5 MHz clock) - sets maximum throughput at 100 kSPS, matching real-time control loop requirements. |
| Data Access Time | 57 ns max - ensures compatibility with 8-bit/16-bit microprocessors (e.g., Intel 80C188, Motorola 68HC11) without wait states. |
| Reference Output | 3.00 V ±10 mV - factory-laser-trimmed buried Zener; supplies internal DAC and bias; loadable up to 500 μA. |
| Power Dissipation | 95 mW max (±5 V supplies) - low quiescent current (IDD = 13 mA, ISS = 6 mA) reduces thermal load in dense PCB layouts. |
| Integral Nonlinearity | ±1 LSB max - ensures monotonicity and predictable transfer function across full temperature range (−40°C to +85°C). |
| Analog Input Impedance | 33 kΩ typical - defines required drive capability for signal conditioning stages; minimizes loading on precision op-amp buffers. |
Pinout & Package
AD7876BR-REEL7 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 identifier is marked by a notch or dot; pins are numbered counterclockwise from top-left corner when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RD | Active-low read strobe input | Enables DB0–DB11 outputs when CS is low; synchronizes data capture with microprocessor bus cycle. |
| 2 BUSY/INT | Open-drain status output | Asserts low during conversion (BUSY); pulses low upon completion (INT); requires external pull-up for interrupt use. |
| 3 CLK | External clock input / internal oscillator enable | Tie to VSS to activate internal laser-trimmed clock; accept TTL-level 2.5 MHz external clock for precise timing control. |
| 4 DB11/HBEN | MSB data output / high-byte enable | Functions as DB11 in 12-bit mode; becomes HBEN control input in byte mode to select upper/lower 8-bit data byte. |
| 5 DB10/SSTRB | Data bit 10 / serial strobe output | Provides DB10 in parallel mode; outputs active-low open-drain framing pulse for serial data (requires 4.7 kΩ pull-up). |
| 6 DB9/SCLK | Data bit 9 / serial clock output | Provides DB9 in parallel mode; outputs gated open-drain serial clock (requires 2 kΩ pull-up; frequency derived from ADC clock). |
| 7 DB8/SDATA | Data bit 8 / serial data output | Provides DB8 in parallel mode; outputs open-drain serial LSB-first data (valid on SCLK falling edge while SSTRB low). |
| 8–11 DB7/LOW–DB4/LOW | Configurable data outputs | Function as DB7–DB4 in 12-bit mode; become lower/upper byte bits depending on HBEN state in byte mode. |
| 12 DGND | Digital ground reference | Return path for logic circuits; must be isolated from AGND except at single-point star ground to prevent noise coupling. |
| 13–16 DB3/DB11–DB0/DB8 | Configurable data outputs | Function as DB3–DB0 in 12-bit mode; map to DB11–DB8 or DB3–DB0 based on HBEN and 12/8/CLK state in byte mode. |
| 17 VDD | +5 V supply (±5%) | Primary power for digital logic and interface circuitry; requires local 0.1 μF ceramic decoupling adjacent to pin. |
| 18 AGND | Analog ground reference | Return for track-and-hold, reference, and DAC; connects to system analog ground plane; separate from DGND. |
| 19 REF OUT | 3 V reference voltage output | Stable 3.00 V ±10 mV source for internal functions; can drive external circuitry up to 500 μA with ≤50 pF capacitance. |
| 20 VIN | Analog input terminal | Accepts ±10 V differential input; 33 kΩ input impedance; requires anti-aliasing filter before sampling at 100 kSPS. |
| 21 VSS | −5 V supply (±5%) | Negative rail for analog front-end and comparator; requires local 0.1 μF ceramic decoupling adjacent to pin. |
| 22 12/8/CLK | Mode select / serial clock control | +5 V = 12-bit parallel only; 0 V = byte/serial with gated SCLK; −5 V = byte/serial with continuous SCLK. |
| 23 CONVST | Convert start trigger | Rising-edge asynchronous command initiates track-to-hold transition and starts conversion sequence. |
| 24 CS | Active-low chip select | Selects device on shared bus; falling edge can initiate conversion if CONVST is tied low (standalone operation). |
Key Features
| Feature | Design Value |
|---|---|
| Complete monolithic ADC | Integrates track-and-hold, 12-bit SAR core, 3 V Zener reference, and interface logic-no external components beyond decoupling caps. |
| Laser-trimmed internal clock | Guarantees 6.5–9 μs conversion time without external timing components; eliminates clock generator BOM cost and layout area. |
| Three interface formats | Supports 12-bit parallel, two-byte parallel, and serial output-enables flexible integration with 8-bit microcontrollers, DSPs, or space-constrained designs. |
| Bipolar ±10 V input range | Directly interfaces with industrial transducers (e.g., LVDTs, load cells) without external level-shifting or gain stages. |
| Low power consumption | 95 mW max at ±5 V supplies enables use in thermally constrained enclosures and battery-backed data loggers. |
| DC accuracy over temperature | ±1 LSB integral nonlinearity and ±6 LSB bipolar zero error specified from −40°C to +85°C-supports calibration-free operation in harsh environments. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Continuous digitization of ±10 V analog signals from pressure, temperature, and flow sensors in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary sampling ADC capturing 100 kSPS data streams with deterministic 8 μs conversion latency for closed-loop feedback. Use Value: Eliminates external op-amp scaling and reference ICs, reducing component count and improving long-term drift stability via integrated 3 V Zener reference. |
Use Scenario: High-fidelity waveform capture in portable oscilloscopes and automated test equipment requiring 12-bit resolution and microprocessor-controlled triggering. IC Role / Device Role / Timing Role: Standalone ADC interfaced to 80C186 CPU via parallel bus; uses CONVST and BUSY/INT for precise sample synchronization. Use Value: 57 ns data access time avoids wait-state insertion, enabling full-speed data transfer to SRAM without performance penalty. |
| Motor Drive Current Sensing | Energy Metering Front-End |
|
Use Scenario: Isolated phase current measurement in servo drives using ±10 V isolated amplifier outputs feeding ADC inputs. IC Role / Device Role / Timing Role: Bipolar-input ADC converting shunt voltage drops into signed 12-bit values for real-time torque calculation in DSP firmware. Use Value: ±10 V input range matches industry-standard isolated amplifier outputs, avoiding gain errors introduced by external resistive dividers. |
Use Scenario: Digitizing scaled voltage and current waveforms in Class 0.5 electricity meters operating across wide temperature ranges. IC Role / Device Role / Timing Role: Precision ADC providing dc-accurate samples for RMS and harmonic analysis algorithms running on ARM Cortex-M4 MCU. Use Value: ±1 LSB INL and ±6 LSB zero error ensure metering accuracy compliance without per-unit factory calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7875BRZ | Unipolar 0 V to +5 V input range; same SOIC-24 package and pinout; identical timing and interface logic. | Suitable for single-supply systems with 0–5 V sensors (e.g., potentiometers, unipolar transducers); not usable for ±10 V inputs. | Select AD7875BRZ only when input signal is strictly unipolar and system lacks negative supply rail. |
| ADS7822U | 12-bit SAR ADC with SPI interface; 200 kSPS max; single +5 V supply; no internal reference; requires external 2.5 V reference. | Designed for low-pin-count, low-power embedded systems; lacks parallel interface and bipolar input capability. | Choose ADS7822U for space-constrained designs needing SPI simplicity and single-supply operation, but expect added BOM cost for reference IC. |
Compared with AD7876BR-REEL7, AD7875BRZ offers identical form-factor and timing but restricts input to 0–5 V, while ADS7822U trades parallel interface and bipolar support for SPI simplicity and single-supply operation-neither is pin-compatible, but both serve overlapping 12-bit sampling roles in distinct system architectures.
Availability
AD7876BR-REEL7 is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, motor drive current sensing, and energy metering front-end applications requiring stable component supply and long-term obsolescence management.
Supply support for AD7876BR-REEL7 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 ISO 9001-certified manufacturing.
The AD7870/AD7875/AD7876 family was engineered for high-accuracy, microprocessor-compatible data acquisition in industrial and instrumentation systems-emphasizing integrated functionality, dc precision, and flexible digital interfacing without external timing components.
FAQ
What is the maximum sampling rate supported by the AD7876BR-REEL7?
The AD7876BR-REEL7 achieves a maximum sampling rate of 100 kSPS, determined by its 8 μs maximum conversion time with a 2.5 MHz external clock. This throughput allows full-power digitization of input signals up to 50 kHz while maintaining 12-bit accuracy and specified dynamic performance parameters.
Does the AD7876BR-REEL7 require external components to operate?
No, the AD7876BR-REEL7 is a complete monolithic ADC requiring only power supply decoupling capacitors (0.1 μF ceramic near VDD/VSS pins). It integrates a track-and-hold amplifier, 12-bit SAR core, laser-trimmed internal clock, and 3 V buried Zener reference-no external op-amps, references, or timing components are needed for basic operation.
Can the AD7876BR-REEL7 interface directly with an 8-bit microcontroller?
Yes, the AD7876BR-REEL7 supports byte-mode operation via HBEN and 12/8/CLK pins, allowing 8-bit parallel data transfer. When HBEN is low, DB7–DB0 deliver the lower byte; when HBEN is high, they deliver the upper byte-enabling seamless connection to 8-bit buses without data multiplexing hardware.
What is the purpose of the REF OUT pin on the AD7876BR-REEL7?
The REF OUT pin provides the internal 3.00 V ±10 mV buried Zener reference voltage, used for DAC scaling and bipolar biasing. It can supply up to 500 μA to external circuitry but must be loaded with ≤50 pF capacitance; for external use beyond the ADC, it requires series 200 Ω + parallel 10 μF tantalum / 0.1 μF ceramic decoupling.
Is the AD7876BR-REEL7 compatible with single-supply systems?
No, the AD7876BR-REEL7 requires dual ±5 V supplies (VDD = +5 V, VSS = −5 V) to operate its analog front-end, track-and-hold amplifier, and internal reference. It cannot function with only a +5 V supply; systems lacking a negative rail must use alternative unipolar ADCs like the AD7875BRZ or add a charge-pump inverter.
AD7876BR-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-REEL7 FAQ
1.How can I place an order for AD7876BR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7876BR-REEL7 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-REEL7 reliable?
The price and inventory of AD7876BR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7876BR-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7876BR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7876BR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7876BR-REEL7?
AD7876BR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7876BR-REEL7 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-REEL7?
For technical support, including AD7876BR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7876BR-REEL7 requirements.
6.How does Aetrix verify that AD7876BR-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7876BR-REEL7 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-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7876BR-REEL7?
All AD7876BR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7876BR-REEL7, 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-REEL7 part is unused and in its original packaging.
Return procedure for AD7876BR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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