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

Analog Devices Inc. AD7876CRZ

Name: AD7876CRZ
Brand: Analog Devices Inc.
SKU: AD7876CRZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD7876CRZ

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

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

Datasheet:: AD7876CRZ.pdf

Description:: IC ADC 12BIT SAR 24SOIC

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Product details

Overview

AD7876CRZ 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. It operates from ±5 V supplies and targets precision data acquisition in industrial instrumentation and test equipment.

For engineers reviewing the AD7876CRZ datasheet, AD7876CRZ pinout, AD7876CRZ application, or AD7876CRZ equivalent, this page provides verified technical context, package-validated pin functions, real-world interface timing constraints, and confirmed alternative options for ±10 V full-scale ADC replacement scenarios.

Technical Context

The AD7876CRZ implements a SAR architecture with internal 3 V reference scaled via on-die resistor network to support ±10 V input range. Its track-and-hold acquires signals to 12-bit accuracy in ≤2 μs, enabling accurate digitization of up to 50 kHz full-power sine waves. The internal clock is laser-trimmed to guarantee 6.5–9 μs conversion time without external components.

Digital interface flexibility includes three modes: 12-bit parallel (DB11–DB0), two-byte (HBEN-controlled), and serial (SCLK/SSTRB/SDATA). Logic inputs accept TTL-compatible levels; outputs drive standard CMOS loads with 40 μA source / 1.6 mA sink capability. All timing parameters-including t6 (57 ns max data access) and t16 (120 ns CS-to-BUSY)-are production-tested across −40°C to +85°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	12 bits - guarantees no missing codes; output is two's complement binary for ±10 V range.
Input Voltage Range	±10 V - supported by internal scaling network; input resistance ≈33 kΩ; LSB = 4.88 mV.
Conversion Time	8 μs max (external 2.5 MHz clock) - enables 100 kHz sampling rate with track-and-hold acquisition overhead.
Data Access Time	57 ns max - compatible with fast 8/16-bit microprocessors and DSPs without wait states.
Reference Output	3.00 V ±10 mV - buried Zener, tempco ≤±35 ppm/°C (B/C grade), load capacity 500 μA.
Power Dissipation	95 mW max (±5 V supplies) - typical 60 mW; IDD ≤13 mA, ISS ≤6 mA.
Integral Nonlinearity	±1 LSB max (B/C grade) - ensures monotonicity and <0.025% full-scale error after calibration.

Pinout & Package

AD7876CRZ is housed in a 24-pin SOIC package (width: 7.5 mm, body: 15.4 mm × 7.5 mm), RoHS-compliant, with gull-wing leads and standard JEDEC MS-013AC footprint.

Pin/Terminal	Circuit Role	Design Meaning
1 RD	Active-low read strobe	Enables DBx outputs when CS is low; controls data bus release timing (t7 ≤5 ns min).
2 BUSY/INT	Open-drain status output	Active-low indicates conversion in progress; doubles as interrupt signal for processor synchronization.
3 CLK	External clock input / oscillator enable	TTL-compatible; tie to VSS to activate internal laser-trimmed clock (6.5–9 μs conversion).
4 DB11/HBEN	MSB data output / high-byte enable	Function depends on 12/8/CLK state; critical for byte-mode interface configuration.
5 DB10/SSTRB	Data bit 10 / serial strobe	SSTRB is open-drain; requires 4.7 kΩ pull-up; frames serial data packets.
6 DB9/SCLK	Data bit 9 / serial clock	SCLK is gated open-drain output; requires 2 kΩ pull-up; edge-aligned to SDATA valid window.
7 DB8/SDATA	Data bit 8 / serial data	SDATA is open-drain; valid on falling SCLK edge while SSTRB low; 4.7 kΩ pull-up required.
8–11 DB7/LOW–DB4/LOW	Configurable data outputs	Function shifts between DB7–DB4 and upper/lower byte based on HBEN and 12/8/CLK logic levels.
12 DGND	Digital ground reference	Isolated return path for digital logic; must be separated from AGND except at single-point star ground.
13–16 DB3/DB11–DB0/DB8	Configurable data outputs	Same dual-role behavior as pins 8–11; collectively deliver full 12-bit word or split byte streams.
17 VDD	+5 V supply (±5%)	Power for digital circuitry and interface logic; requires local 0.1 μF ceramic decoupling.
18 AGND	Analog ground reference	Return for track-and-hold, DAC, and reference; connects to system analog ground plane.
19 REF OUT	3 V reference output	Internally trimmed Zener; capable of sourcing 500 μA; max 50 pF capacitive load.
20 VIN	Bipolar analog input	Accepts ±10 V differential input; input impedance ≈33 kΩ; designed for direct sensor connection.
21 VSS	−5 V supply (±5%)	Power for analog core and track-and-hold; requires separate 0.1 μF ceramic decoupling.
22 12/8/CLK	Mode select 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	Rising-edge asynchronous start; initiates track-to-hold transition and conversion sequence.
24 CS	Chip select	Active-low enables device; falling edge can initiate conversion if CONVST tied low.

Key Features

Feature	Design Value
Complete monolithic ADC	Integrates 12-bit SAR, track-and-hold, 3 V reference, and interface logic-no external timing or reference components needed.
Flexible digital interface	Supports 12-bit parallel, two-byte, and serial output formats via hardware-configurable pins (12/8/CLK, HBEN).
Laser-trimmed internal clock	Guarantees 6.5–9 μs conversion time without external crystal or RC network; reduces BOM count and layout complexity.
±10 V input range	Enabled by internal resistor scaling network; eliminates need for external gain/level-shift amplifiers in industrial voltage monitoring.
Low power operation	60 mW typical dissipation at ±5 V supplies enables use in thermally constrained embedded systems and portable test gear.

Applications

Industrial Process Monitoring	Automated Test Equipment (ATE)
Use Scenario: Continuous digitization of ±10 V sensor outputs (e.g., strain gauges, pressure transducers) in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary ADC capturing analog process variables at 100 kHz with deterministic latency for closed-loop response. Use Value: Eliminates external signal conditioning; 12-bit resolution and ±1 LSB INL ensure <0.025% measurement fidelity over temperature.	Use Scenario: High-speed stimulus-response capture in benchtop ATE, where ±10 V DUT outputs require precise digitization before analysis. IC Role / Device Role / Timing Role: Standalone sampling node synchronized to system controller via CONVST and BUSY/INT handshake. Use Value: 57 ns data access enables direct connection to FPGA or microcontroller data buses without glue logic or wait-state insertion.
Power Quality Analyzers	Medical Data Acquisition Systems
Use Scenario: Digitizing ±10 V line-voltage derivatives (e.g., CT/PT secondary outputs) for harmonic distortion and RMS calculation. IC Role / Device Role / Timing Role: High-fidelity front-end converter operating at Nyquist-limited rates up to 50 kHz with minimal THD. Use Value: Internal 3 V reference and laser-trimmed clock ensure stable SNR (≥69 dB) and THD (≤−78 dB) across −40°C to +85°C operating range.	Use Scenario: Isolated patient-monitoring channels requiring accurate ±10 V biopotential signal digitization (e.g., EEG, EMG front-ends). IC Role / Device Role / Timing Role: Precision ADC stage following isolation amplifier; uses AGND/DGND separation to maintain common-mode rejection. Use Value: Dual ground pins (AGND/DGND) and 2 μs track-and-hold acquisition minimize noise coupling and preserve signal integrity in mixed-signal medical PCBs.

Industrial Process Monitoring

Automated Test Equipment (ATE)

Use Scenario: Continuous digitization of ±10 V sensor outputs (e.g., strain gauges, pressure transducers) in PLC-based control cabinets.

IC Role / Device Role / Timing Role: Primary ADC capturing analog process variables at 100 kHz with deterministic latency for closed-loop response.

Use Value: Eliminates external signal conditioning; 12-bit resolution and ±1 LSB INL ensure <0.025% measurement fidelity over temperature.

Use Scenario: High-speed stimulus-response capture in benchtop ATE, where ±10 V DUT outputs require precise digitization before analysis.

IC Role / Device Role / Timing Role: Standalone sampling node synchronized to system controller via CONVST and BUSY/INT handshake.

Use Value: 57 ns data access enables direct connection to FPGA or microcontroller data buses without glue logic or wait-state insertion.

Power Quality Analyzers

Medical Data Acquisition Systems

Use Scenario: Digitizing ±10 V line-voltage derivatives (e.g., CT/PT secondary outputs) for harmonic distortion and RMS calculation.

IC Role / Device Role / Timing Role: High-fidelity front-end converter operating at Nyquist-limited rates up to 50 kHz with minimal THD.

Use Value: Internal 3 V reference and laser-trimmed clock ensure stable SNR (≥69 dB) and THD (≤−78 dB) across −40°C to +85°C operating range.

Use Scenario: Isolated patient-monitoring channels requiring accurate ±10 V biopotential signal digitization (e.g., EEG, EMG front-ends).

IC Role / Device Role / Timing Role: Precision ADC stage following isolation amplifier; uses AGND/DGND separation to maintain common-mode rejection.

Use Value: Dual ground pins (AGND/DGND) and 2 μs track-and-hold acquisition minimize noise coupling and preserve signal integrity in mixed-signal medical PCBs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit, ±10 V input ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD7875CRZ	Unipolar 0 V to +5 V input range; same package, pinout, and interface logic; lacks ±10 V scaling network.	Requires external level-shifting for bipolar signals; unsuitable for direct ±10 V sensor interfacing.	Select only if system uses unipolar sensors or has dedicated front-end signal conditioning.
ADS8505IPW	16-bit SAR ADC; ±10 V input; SPI-only interface; no internal reference; requires external 4.096 V reference.	Higher resolution but no parallel/byte modes; lacks integrated reference and track-and-hold; needs external clock and reference.	Choose when 16-bit resolution is mandatory and system can accommodate SPI interface and external reference design.

Compared with AD7876CRZ, AD7875CRZ omits bipolar scaling and cannot directly replace it in ±10 V applications, while ADS8505IPW trades interface flexibility and integration for higher resolution and requires additional support components.

Availability

AD7876CRZ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, power quality analyzers, and medical data acquisition systems requiring stable component supply and long-term obsolescence management.

Supply support for AD7876CRZ 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 AD7876CRZ belongs to the LC2MOS 12-bit sampling ADC family, designed specifically for precision data acquisition in industrial, instrumentation, and test environments where integration, reliability, and ±10 V input capability are critical.

FAQ

What is the maximum analog input frequency the AD7876CRZ can accurately digitize?

The AD7876CRZ can convert full-power signals up to 50 kHz while maintaining 12-bit accuracy. This is enabled by its 2 μs track-and-hold acquisition time and 8 μs conversion time, yielding a 10 μs total cycle at 100 kHz sampling rate. Performance is specified per dynamic tests in Table 2, with SNR ≥69 dB and THD ≤−78 dB at 10 kHz input under fSAMPLE = 100 kHz conditions. The AD7876CRZ does not specify dynamic performance beyond 50 kHz in official documentation.

Does the AD7876CRZ require external components to operate?

No, the AD7876CRZ is a complete ADC requiring only power supply decoupling capacitors: 0.1 μF ceramic capacitors placed close to VDD and VSS pins. It integrates a laser-trimmed internal clock, 3 V buried Zener reference, and track-and-hold amplifier. External components like pull-up resistors (4.7 kΩ on SSTRB/SDATA, 2 kΩ on SCLK) are required only for serial interface operation-not for basic parallel mode functionality.

How is the ±10 V input range implemented in the AD7876CRZ?

AD7876CRZ implements ±10 V input range using an internal resistor scaling network connected to the track-and-hold amplifier input, as shown in Figure 9 of the datasheet. This network (2.1R/7R/3R topology) attenuates the ±10 V input to match the internal 3 V reference range, eliminating need for external op-amp gain stages. Input resistance is ≈33 kΩ, and the output code remains two's complement binary with 1 LSB = 4.88 mV (20 V / 4096).

Can the AD7876CRZ be used with a microcontroller lacking a 12-bit data bus?

Yes, the AD7876CRZ supports byte-mode and serial interfaces. In byte mode (controlled by HBEN and 12/8/CLK), it outputs two 8-bit words-upper byte on DB7–DB0 when HBEN is high, lower byte when HBEN is low. In serial mode, it transmits 12-bit data via SDATA, clocked by SCLK and framed by SSTRB. Both modes eliminate requirement for a native 12-bit parallel bus.

What is the operating temperature range for the AD7876CRZ part number?

The AD7876CRZ is rated for industrial operation from −40°C to +85°C. The 'C' grade designation corresponds to the B/C temperature option defined in Table 2 of the datasheet, which specifies performance limits (e.g., ±1 LSB INL max, ±35 ppm/°C reference tempco) across this full range. Absolute maximum ratings extend to −55°C to +125°C, but guaranteed specifications apply only within −40°C to +85°C.

AD7876CRZ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

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

Packaging:: Tube

Product Status:: Active

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:: -

AD7876CRZ FAQ

1.How can I place an order for AD7876CRZ through Aetrix?

Please submit a Request for Quotation (RFQ) for AD7876CRZ 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 AD7876CRZ reliable?

The price and inventory of AD7876CRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7876CRZ is usually 5 days.

3.What payment methods are accepted for AD7876CRZ?

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4.How is shipping managed for AD7876CRZ?

AD7876CRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD7876CRZ 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 AD7876CRZ?

For technical support, including AD7876CRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7876CRZ requirements.

6.How does Aetrix verify that AD7876CRZ is sourced from the original manufacturer or authorized distributors?

All AD7876CRZ 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 AD7876CRZ meets industry standards.

7.What is the process for return or replacement of AD7876CRZ?

All AD7876CRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7876CRZ, 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 AD7876CRZ part is unused and in its original packaging.

Return procedure for AD7876CRZ:

1.Submit a request within 90 days.

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

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