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Analog Devices Inc. AD7876CNZ
- Part No.:
- AD7876CNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7876CNZ.pdf
- Description:
- IC ADC 12BIT SAR 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,750
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Product details
Overview
AD7876CNZ 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 AD7876CNZ datasheet, AD7876CNZ pinout, AD7876CNZ application, or AD7876CNZ equivalent, this page provides verified technical context, package-validated pin functions, real-world interface timing constraints, and confirmed alternative options for ±10 V input-range 12-bit sampling ADCs requiring no external timing components.
Technical Context
The AD7876CNZ implements a SAR architecture with internal 3 V reference and 2 μs track-and-hold acquisition, enabling full-scale conversion of signals up to 50 kHz. Its dual-mode digital interface supports 12-bit parallel, byte-wide (HBEN-controlled), and serial (SCLK/SSTRB/SDATA) outputs via shared pins.
Conversion is initiated asynchronously by CONVST rising edge or CS falling edge; BUSY/INT output signals completion. The 12/8/CLK pin selects between 12-bit parallel-only mode (+5 V), or byte/serial modes (0 V or −5 V), with SCLK gating behavior dependent on that state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes; supports 4096 distinct output levels for precise amplitude quantization. |
| Input Range | ±10 V - enables direct digitization of high-voltage industrial sensor outputs without external scaling. |
| Conversion Time | 8 μs max with 2.5 MHz external clock - sets maximum throughput at 100 kSPS when combined with 2 μs track-and-hold acquisition. |
| Data Access Time | 57 ns max - ensures compatibility with fast 8-bit/16-bit microprocessors and DSPs without wait-state insertion. |
| Reference Output | 3.00 V ±10 mV - factory-laser-trimmed buried Zener reference, stable to ±35 ppm/°C (L/C grade), loadable to 500 μA. |
| Power Dissipation | 95 mW max at ±5 V supplies - low quiescent power enables use in thermally constrained embedded systems. |
| Dynamic SNR | Not production-tested on AD7876, but typically matches AD7875 at 72 dB @ 10 kHz - indicates usable dynamic range for medium-bandwidth signal capture. |
Pinout & Package
AD7876CNZ is housed in a 24-pin small outline IC (SOIC) package with 300 mil body width and standard 1.27 mm pitch. Pin functions are electrically identical to the DIP variant per Figure 2 of Rev. C datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RD | Read strobe input | Active-low control enabling three-state DB[11:0] outputs; must be asserted with CS low to read converted data. |
| 2 BUSY/INT | Status output | Open-drain active-low signal indicating conversion in progress (BUSY) or completion (INT pulse). |
| 3 CLK | Clock input | TTL-compatible input; tie to VSS to enable internal laser-trimmed oscillator (no external timing components required). |
| 4 DB11/HBEN | Multi-function I/O | DB11 output in 12-bit mode; HBEN control input in byte mode-selects upper/lower byte on shared data lines. |
| 20 VIN | Analog input | ±10 V differential input node referenced to AGND; 33 kΩ typical input resistance; requires proper layout isolation from digital noise. |
| 19 REF OUT | Reference output | 3.00 V precision reference source; limited to 500 μA load; decoupling required (200 Ω + 10 μF || 0.1 μF) if used externally. |
| 18 AGND | Analog ground | Dedicated ground return for track-and-hold, DAC, and reference circuitry-must be separated from DGND at single point. |
| 12 DGND | Digital ground | Ground reference for logic interface; connected to system digital plane; separation from AGND prevents digital noise coupling. |
| 17 VDD / 21 VSS | Power supplies | +5 V ±5% and −5 V ±5% analog supplies; require local 0.1 μF ceramic + 10 μF tantalum decoupling at each pin. |
Key Features
| Feature | Design Value |
|---|---|
| Complete monolithic ADC | Integrates 12-bit SAR core, 2 μs track-and-hold, 3 V reference, and interface logic-eliminates need for external clock, reference, or sample-hold ICs. |
| Laser-trimmed internal clock | Guarantees 6.5–9 μs conversion time without external timing components; reduces BOM count and layout sensitivity. |
| Three-format digital interface | Supports 12-bit parallel, two-byte, and serial output via pin-multiplexed DB[11:0], SCLK, SSTRB, and SDATA-enables flexible host processor integration. |
| Bipolar ±10 V input range | Directly interfaces with industrial transducers (e.g., strain gauges, RTD bridges) without external level-shifting or gain stages. |
| Low power operation | 95 mW max dissipation at full performance allows use in space- and thermal-constrained instrumentation modules. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous digitization of 4–20 mA current loop outputs converted to ±10 V via precision shunt resistor in PLC analog input modules. IC Role / Device Role / Timing Role: Primary sampling ADC providing 12-bit resolution at 100 kSPS with deterministic conversion latency for real-time control feedback loops. Use Value: Eliminates external reference and clock components, reducing calibration drift and improving long-term measurement stability over temperature. |
Use Scenario: Digitizing calibrated sensor outputs (e.g., pressure, temperature) in portable handheld meters requiring battery-efficient operation. IC Role / Device Role / Timing Role: Standalone ADC capturing transient events with CONVST-triggered acquisition and BUSY/INT status signaling. Use Value: 57 ns data access time enables direct connection to low-power ARM Cortex-M MCUs without glue logic or FIFO buffers. |
| Motor Drive Current Sensing | Legacy System Retrofit |
Use Scenario: Isolated phase current measurement using ±10 V-output isolated amplifiers feeding directly into AD7876CNZ in servo drive control boards. IC Role / Device Role / Timing Role: High-accuracy analog front-end ADC with bipolar input handling bidirectional current flow without polarity switching. Use Value: Twos-complement output format simplifies signed arithmetic in motor control algorithms; ±10 V range accommodates peak currents without clipping. |
Use Scenario: Replacing obsolete 12-bit ADCs (e.g., AD7572) in legacy industrial controllers where board space and pin compatibility are critical. IC Role / Device Role / Timing Role: Drop-in functional replacement offering identical SOIC-24 footprint and compatible timing (t6 = 57 ns, t16 = 120 ns). Use Value: Maintains existing PCB layout while upgrading to laser-trimmed clock accuracy and improved dc specifications (±1 LSB INL max). |
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 |
|---|---|---|---|
| AD7875CRZ | Unipolar 0 V to +5 V input range; same SOIC-24 package; identical timing and interface logic. | Requires external level-shifting for ±10 V signals; suited for single-supply systems with 0–5 V sensors. | Select when interfacing with unipolar transducers or when reference voltage must match system logic supply. |
| ADS7825U | 12-bit SAR ADC with 100 kSPS, ±10 V input, but uses external reference and requires external clock; SOIC-24 package. | Lacks integrated reference and clock-increases BOM and layout complexity; higher system-level power consumption. | Choose only if existing design already sources external 3 V reference and 2.5 MHz clock, minimizing redesign effort. |
Compared with AD7875CRZ, AD7876CNZ enables direct ±10 V acquisition without signal conditioning; compared with ADS7825U, it reduces component count and improves thermal stability via on-chip laser-trimmed reference and clock-critical for field-deployed instrumentation.
Availability
AD7876CNZ is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, and motor drive current sensing requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for AD7876CNZ 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 AD787x family was designed specifically for industrial data acquisition systems requiring self-contained, low-drift 12-bit conversion with minimal external components and guaranteed ac/dc performance across temperature.
FAQ
What input voltage range does the AD7876CNZ support?
The AD7876CNZ supports a ±10 V bipolar analog input range referenced to AGND. This is implemented via internal resistive scaling (2.1R/7R/3R network) and is distinct from the ±3 V range of AD7870 or 0 V to +5 V range of AD7875. Input impedance is typically 33 kΩ, and the output code is twos complement binary with 1 LSB = 4.88 mV.
Does the AD7876CNZ require an external clock to operate?
No, the AD7876CNZ does not require an external clock. Its internal laser-trimmed oscillator is enabled by tying the CLK pin to VSS, delivering guaranteed 6.5–9 μs conversion time. An external 2.5 MHz TTL clock may be applied to CLK for tighter timing control, but it is optional-not mandatory-for basic operation.
What digital interface formats does the AD7876CNZ support?
The AD7876CNZ supports three interface formats selected via the 12/8/CLK pin: 12-bit parallel (12/8/CLK = +5 V), byte-wide (12/8/CLK = 0 V or −5 V with HBEN control), and serial (SCLK/SSTRB/SDATA, enabled when 12/8/CLK = 0 V or −5 V). All share the same physical pins (DB11–DB0, etc.) with multiplexed functionality.
Can the AD7876CNZ reference output be used externally?
Yes, the REF OUT pin provides a 3.00 V ±10 mV buried Zener reference capable of sourcing up to 500 μA. For external use, Analog Devices specifies a decoupling network: 200 Ω series resistor followed by parallel 10 μF tantalum and 0.1 μF ceramic capacitors. Load capacitance must not exceed 50 pF during conversion.
What is the operating temperature range for the AD7876CNZ part number?
The AD7876CNZ is rated for industrial temperature operation from −40°C to +85°C. The 'C' suffix denotes the industrial grade (−40°C to +85°C), and the 'N' indicates the 24-pin SOIC package. This rating is validated per Table 2 and Absolute Maximum Ratings in Rev. C datasheet.
AD7876CNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7876CNZ FAQ
1.How can I place an order for AD7876CNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7876CNZ 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 AD7876CNZ reliable?
The price and inventory of AD7876CNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7876CNZ is usually 5 days.
3.What payment methods are accepted for AD7876CNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7876CNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7876CNZ?
AD7876CNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7876CNZ 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 AD7876CNZ?
For technical support, including AD7876CNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7876CNZ requirements.
6.How does Aetrix verify that AD7876CNZ is sourced from the original manufacturer or authorized distributors?
All AD7876CNZ 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 AD7876CNZ meets industry standards.
7.What is the process for return or replacement of AD7876CNZ?
All AD7876CNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7876CNZ, 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 AD7876CNZ part is unused and in its original packaging.
Return procedure for AD7876CNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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