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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Analog Devices Inc. AD7876CR

Name: AD7876CR
Brand: Analog Devices Inc.
SKU: AD7876CR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD7876CR

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 24-SOIC (0.295", 7.50mm Width)

Datasheet:: AD7876CR.pdf

Description:: IC ADC 12BIT SAR 24SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AD7876CR 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 AD7876CR datasheet, AD7876CR pinout, AD7876CR application, or AD7876CR equivalent, this page provides verified technical context, real-world interface timing constraints, confirmed SOIC-24 package mapping, and two validated alternative parts with documented functional and application-level differences.

Technical Context

The AD7876CR implements a SAR architecture with internal 3 V reference and 2 μs track-and-hold acquisition, enabling full-scale signal conversion up to 50 kHz. Its analog input stage uses a resistor-scaling network (2.1R/7R/3R) to translate ±10 V inputs to the internal ±3 V reference range while maintaining 12-bit twos-complement output coding.

Digital interface flexibility includes three modes: 12-bit parallel (DB11–DB0), byte-mode (HBEN-controlled high/low byte), and serial (SCLK/SSTRB/SDATA with open-drain outputs requiring external pull-ups). The 12/8/CLK pin selects format and controls SCLK gating behavior-critical for deterministic timing in DSP-linked systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	12 bits - guarantees no missing codes; output is twos-complement binary with 1 LSB = 4.88 mV (±10 V FS / 4096)
Input Range	±10 V - supported by internal resistor scaling network; input impedance ≈33 kΩ; compatible with industrial sensor outputs
Conversion Time	8 μs max (external 2.5 MHz clock) - enables 100 kHz sampling rate; internal clock option yields 6.5–9 μs range
Data Access Time	57 ns max - meets timing requirements of fast 8/16-bit microprocessors without wait states
Reference Output	3.00 V ±10 mV - factory-laser-trimmed buried Zener; load capability ≤500 μA; tempco ≤±35 ppm/°C (C grade)
Power Dissipation	95 mW max (±5 V supplies) - typical 60 mW at +25°C; IDD ≤13 mA, ISS ≤6 mA
Integral Nonlinearity	±1 LSB max (C grade, −40°C to +85°C) - ensures monotonicity and linearity for precision measurement

Pinout & Package

AD7876CR is housed in a 24-pin small outline integrated circuit (SOIC) package with 0.3-inch body width and standard JEDEC MS-013AC footprint. 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	Read control input	Active-low enable for parallel/byte data output; must be low with CS to drive DBx lines
2 BUSY/INT	Status output	Open-drain active-low signal indicating conversion in progress (BUSY) or completion (INT)
3 CLK	Clock input	TTL-compatible; tie to VSS to enable internal laser-trimmed oscillator (no external components needed)
4 DB11/HBEN	Multi-function I/O	DB11 output in 12-bit mode; HBEN control input in byte mode to select high/low byte
5 DB10/SSTRB	Multi-function I/O	DB10 output in 12-bit mode; active-low serial strobe (open-drain, 4.7 kΩ pull-up required)
6 DB9/SCLK	Multi-function I/O	DB9 output in 12-bit mode; gated serial clock (open-drain, 2 kΩ pull-up required)
7 DB8/SDATA	Multi-function I/O	DB8 output in 12-bit mode; serial data output (open-drain, 4.7 kΩ pull-up required)
8–11 DB7/LOW–DB4/LOW	Configurable data outputs	Function depends on 12/8/CLK and HBEN state; used as DB7–DB4 (12-bit) or upper/lower byte (byte mode)
12 DGND	Digital ground	Reference for logic circuits; must be connected to system digital ground plane
13–16 DB3/DB11–DB0/DB8	Configurable data outputs	Function depends on 12/8/CLK and HBEN state; used as DB3–DB0 (12-bit) or upper/lower byte (byte mode)
17 VDD	Positive supply	+5 V ±5%; requires local 0.1 μF ceramic decoupling capacitor to DGND
18 AGND	Analog ground	Reference for track-and-hold, DAC, and reference; must be isolated from DGND at single-point star ground
19 REF OUT	Reference voltage output	3.00 V ±10 mV; capable of sourcing/sinking ≤500 μA; max 50 pF capacitance recommended
20 VIN	Analog input	±10 V differential input range; internal scaling network sets gain and offset for bipolar operation
21 VSS	Negative supply	−5 V ±5%; requires local 0.1 μF ceramic decoupling capacitor to DGND
22 12/8/CLK	Mode selection input	+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	Asynchronous rising-edge start signal; initiates track-to-hold transition and conversion sequence
24 CS	Chip select	Active-low device enable; falling edge can initiate conversion if CONVST is tied low

Key Features

Feature	Design Value
Complete monolithic ADC	Integrates 12-bit SAR core, 2 μs track-and-hold, 3 V buried Zener reference, and laser-trimmed clock-no external timing components required
Three interface formats	Supports 12-bit parallel, byte-mode (HBEN-controlled), and serial (SCLK/SSTRB/SDATA) outputs-enables flexible integration with legacy and modern controllers
Bipolar ±10 V input	Internal resistor-scaling network (2.1R/7R/3R) maps ±10 V to internal ±3 V reference range while preserving 12-bit resolution and twos-complement coding
Low-power operation	Typical 60 mW power dissipation at +25°C (±5 V supplies); IDD ≤13 mA, ISS ≤6 mA-suitable for thermally constrained industrial modules
DC accuracy guaranteed	±1 LSB integral nonlinearity (max, C grade), ±6 LSB bipolar zero error (max, C grade), and ±8 LSB full-scale error (max, C grade) over −40°C to +85°C

Applications

Industrial Data Acquisition	Test & Measurement Equipment
Use Scenario: High-accuracy voltage monitoring of ±10 V sensor outputs (e.g., strain gauges, RTD bridges) in PLC backplanes. IC Role / Device Role / Timing Role: ADC front-end with integrated reference and track-and-hold; handles full-scale 50 kHz signals with <2 μs acquisition. Use Value: Eliminates external reference and clock components, reducing BOM count and layout area while maintaining ±1 LSB INL over industrial temperature range.	Use Scenario: Digitizing calibrated analog signals in benchtop multimeters and waveform analyzers requiring stable 12-bit resolution. IC Role / Device Role / Timing Role: Precision sampling ADC with 3 V reference output used to bias external signal conditioning stages. Use Value: Factory-laser-trimmed 3 V reference (±10 mV, ±35 ppm/°C) enables traceable calibration without external voltage standards.
Motor Control Feedback	Energy Metering Systems
Use Scenario: Sampling phase currents and DC bus voltages in servo drives where ±10 V isolation amplifier outputs feed the ADC. IC Role / Device Role / Timing Role: Real-time analog-to-digital converter with 57 ns data access time synchronized to PWM cycles via CONVST edge triggering. Use Value: Fast bus interface allows direct connection to TI C2000 or ST STM32 microcontrollers without glue logic or FIFO buffering.	Use Scenario: Measuring utility-grade AC voltage and current waveforms in Class 0.5 energy meters using isolated ±10 V signal chains. IC Role / Device Role / Timing Role: High-linearity ADC with guaranteed monotonicity and no missing codes across full operating temperature range. Use Value: ±1 LSB integral nonlinearity (max) ensures accurate RMS calculation and harmonic analysis per IEC 62053-22 compliance.

Industrial Data Acquisition

Test & Measurement Equipment

Use Scenario: High-accuracy voltage monitoring of ±10 V sensor outputs (e.g., strain gauges, RTD bridges) in PLC backplanes.

IC Role / Device Role / Timing Role: ADC front-end with integrated reference and track-and-hold; handles full-scale 50 kHz signals with <2 μs acquisition.

Use Value: Eliminates external reference and clock components, reducing BOM count and layout area while maintaining ±1 LSB INL over industrial temperature range.

Use Scenario: Digitizing calibrated analog signals in benchtop multimeters and waveform analyzers requiring stable 12-bit resolution.

IC Role / Device Role / Timing Role: Precision sampling ADC with 3 V reference output used to bias external signal conditioning stages.

Use Value: Factory-laser-trimmed 3 V reference (±10 mV, ±35 ppm/°C) enables traceable calibration without external voltage standards.

Motor Control Feedback

Energy Metering Systems

Use Scenario: Sampling phase currents and DC bus voltages in servo drives where ±10 V isolation amplifier outputs feed the ADC.

IC Role / Device Role / Timing Role: Real-time analog-to-digital converter with 57 ns data access time synchronized to PWM cycles via CONVST edge triggering.

Use Value: Fast bus interface allows direct connection to TI C2000 or ST STM32 microcontrollers without glue logic or FIFO buffering.

Use Scenario: Measuring utility-grade AC voltage and current waveforms in Class 0.5 energy meters using isolated ±10 V signal chains.

IC Role / Device Role / Timing Role: High-linearity ADC with guaranteed monotonicity and no missing codes across full operating temperature range.

Use Value: ±1 LSB integral nonlinearity (max) ensures accurate RMS calculation and harmonic analysis per IEC 62053-22 compliance.

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
AD7875CR	Unipolar 0 V to +5 V input range; same SOIC-24 package; identical timing and interface logic	Designed for single-supply systems with 0–5 V sensors (e.g., potentiometers, unipolar transducers); lacks bipolar scaling network	Select AD7875CR when input signals are strictly unipolar and system ground-referenced; not suitable for ±10 V industrial sensors.
ADS7822U	12-bit SAR ADC with SPI interface only; 200 kSPS max; requires external reference; 8-pin SOIC package	Targeted at low-pin-count, low-power embedded systems (e.g., battery-powered sensors); no parallel/byte interface support	Choose ADS7822U for space-constrained designs needing SPI simplicity and lower power; AD7876CR remains preferred for microprocessor bus interfacing and ±10 V input support.

Compared with AD7875CR and ADS7822U, the AD7876CR uniquely combines ±10 V bipolar input capability, parallel/byte/serial interface flexibility, and fully integrated reference/clock in a single SOIC-24 package-making it irreplaceable in industrial data loggers and motor control boards requiring wide dynamic range and microprocessor compatibility.

Availability

AD7876CR is available at Aetrix Electronics and suitable for industrial data acquisition, test equipment, motor control feedback, and energy metering systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD7876CR 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, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD7876CR belongs to the AD787x family of complete LC2MOS 12-bit sampling ADCs, designed specifically for industrial instrumentation and data acquisition systems requiring self-contained accuracy, robust bipolar input handling, and microprocessor-friendly digital interfaces.

FAQ

What is the maximum analog input frequency the AD7876CR can accurately digitize?

The AD7876CR supports full-power analog input signals up to 50 kHz while maintaining 12-bit accuracy. This is enabled by its 2 μs track-and-hold acquisition time and internal bandwidth exceeding the Nyquist rate at 100 kHz sampling. For optimal SNR, input frequencies should remain below 50 kHz; the device's 0.1 dB cutoff is typically 500 kHz, ensuring minimal attenuation and phase shift within its specified operating range. The AD7876CR datasheet confirms this performance under standard test conditions with ±10 V input and 2.5 MHz external clock.

Does the AD7876CR require external components to operate?

No, the AD7876CR is a complete ADC requiring only power supply decoupling capacitors-specifically 0.1 μF ceramic capacitors placed close to VDD and VSS pins referenced to DGND. It integrates a laser-trimmed internal clock oscillator, 3 V buried Zener reference, and track-and-hold amplifier, eliminating the need for external timing crystals, reference ICs, or sample-hold circuits. External pull-up resistors (4.7 kΩ on SSTRB/SDATA, 2 kΩ on SCLK) are required only when using serial interface mode, as specified in the AD7876CR functional description.

How does the AD7876CR handle bipolar ±10 V inputs internally?

The AD7876CR uses an internal resistor-scaling network (2.1R/7R/3R) shown in Figure 9 of the datasheet to map the ±10 V input range to the internal ±3 V reference range. This passive scaling preserves 12-bit resolution and ensures code transitions occur at precise intervals (1 LSB = 4.88 mV). The output remains twos-complement binary, allowing direct interpretation of negative values without software sign extension. Unlike the AD7870 (±3 V) or AD7875 (0–5 V), the AD7876CR's analog input structure is uniquely configured for this wider bipolar range.

What are the valid logic levels for the AD7876CR's digital inputs?

The AD7876CR digital inputs (CS, RD, CONVST, 12/8/CLK, HBEN) accept TTL-compatible levels: VIH ≥ 2.4 V and VIL ≤ 0.8 V, referenced to DGND, with input current ≤±10 μA across the full temperature range. The CLK input tolerates voltages from VSS to VDD (−5 V to +5 V), enabling direct connection to the internal oscillator by tying it to VSS. All inputs are specified with 5 ns rise/fall times and tested under load conditions defined in Figures 4 and 5 of the AD7876CR datasheet.

Can the AD7876CR's internal reference be used to bias external circuitry?

Yes, the AD7876CR's REF OUT pin provides a stable 3.00 V ±10 mV reference capable of sourcing or sinking up to 500 μA. It is factory-laser-trimmed with ≤±35 ppm/°C tempco (C grade) and intended for use in external signal conditioning stages. However, the datasheet specifies that the reference load must remain constant during conversion; any change in load current will cause output voltage deviation. For best results, decouple REF OUT with a 200 Ω series resistor followed by a parallel 10 μF tantalum and 0.1 μF ceramic capacitor to suppress switching noise from the ADC core.

AD7876CR 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:: -

AD7876CR FAQ

1.How can I place an order for AD7876CR through Aetrix?

Please submit a Request for Quotation (RFQ) for AD7876CR 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 AD7876CR reliable?

The price and inventory of AD7876CR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7876CR is usually 5 days.

3.What payment methods are accepted for AD7876CR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7876CR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD7876CR?

AD7876CR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD7876CR 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 AD7876CR?

For technical support, including AD7876CR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7876CR requirements.

6.How does Aetrix verify that AD7876CR is sourced from the original manufacturer or authorized distributors?

All AD7876CR 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 AD7876CR meets industry standards.

7.What is the process for return or replacement of AD7876CR?

All AD7876CR units undergo pre-shipment inspection (PSI). If there is an issue with AD7876CR, 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 AD7876CR part is unused and in its original packaging.

Return procedure for AD7876CR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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