My Inquiry
My Account
Analog Devices Inc. AD976CR
- Part No.:
- AD976CR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD976CR.pdf
- Description:
- IC ADC 16BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,606
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD976CR from Analog Devices is a 16-bit, 100 kSPS BiCMOS successive-approximation analog-to-digital converter with ±10 V input range, internal 2.5 V reference, and parallel 16-bit twos-complement output interface - designed for precision industrial data acquisition systems requiring high DC accuracy and moderate-speed sampling.
For engineers reviewing the AD976CR datasheet, AD976CR pinout, AD976CR application, or AD976CR equivalent, this page delivers verified technical context, real-world timing behavior, package-specific layout guidance, and validated alternative options for signal chain design continuity.
Technical Context
The AD976CR implements a switched-capacitor SAR architecture with on-chip laser-trimmed capacitor array calibration, eliminating external sample-and-hold circuitry and minimizing temperature-induced linearity drift. It uses factory-stored thin-film resistor coefficients to correct capacitor mismatches during conversion.
It operates from a single 5 V supply (4.75–5.25 V), supports both internal and external 2.5 V reference selection, and features fully tested AC performance including 83 dB SNR, –90 dB THD, and 90 dB SFDR at 20 kHz input - all specified across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 305 µV LSB step size over ±10 V full-scale range. |
| Throughput Rate | 100 kSPS - fixed conversion time of 10 µs enables deterministic sampling in closed-loop control. |
| Analog Input Range | ±10 V - standard industrial bipolar range, supported by 23 kΩ input impedance and 22 pF capacitance. |
| DC Accuracy (INL) | ±3 LSB max - ensures monotonicity and ≤15-bit effective linearity without post-calibration. |
| Power Dissipation | 100 mW max - enables operation in thermally constrained industrial enclosures without forced cooling. |
| Reference | Internal 2.5 V ±20 mV - eliminates need for external voltage reference IC in cost-sensitive designs. |
| Digital Interface | Parallel 16-bit twos-complement - direct connection to microcontroller GPIO or FPGA I/O banks without protocol translation. |
Pinout & Package
AD976CR is housed in a 28-lead Small Outline Integrated Circuit (SOIC) package (R-28), 300 mil width, with gull-wing leads and standard JEDEC MS-012AC footprint. Thermal resistance θJA = 72°C/W enables stable operation at full rated throughput under ambient temperatures up to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Analog input | ±10 V differential-capable input node; requires 200 Ω series resistor per datasheet Figure 5 for optimal linearity. |
| REF | Reference I/O | Supplies or accepts 2.5 V reference; must be decoupled to AGND1 with 2.2 µF tantalum capacitor. |
| CAP | Reference buffer output | Stabilizes internal reference; requires 2.2 µF tantalum capacitor to AGND2 per functional diagram. |
| D15–D0 | Parallel data outputs | 16-bit twos-complement result; high-impedance when CS HIGH or R/C LOW - enables bus sharing. |
| R/C | Read/Convert control | Falling edge initiates conversion; rising edge enables data output - supports asynchronous read timing. |
| CS | Chip select | OR'd with R/C; falling edge triggers conversion or data enable depending on R/C state - enables flexible control modes. |
| BUSY | Status indicator | Active-low open-drain output; asserts low for 8 µs (typical) during conversion - used for handshake or interrupt-driven reads. |
| BYTE | Data format selector | LOW = D15 (MSB) on Pin 6, D0 (LSB) on Pin 22; HIGH = byte-swapped mapping for 8-bit microcontrollers. |
| VANA / VDIG | Analog/digital supplies | Separate 5 V rails reduce digital noise coupling into analog section - requires independent 0.1 µF + 2.2 µF decoupling per rail. |
| AGND1 / AGND2 / DGND | Ground terminals | AGND1 references REF; AGND2 references CAP; DGND isolated - mandates star grounding at single point under device. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip calibration | Factory-trimmed capacitor array with stored correction coefficients eliminates need for system-level INL compensation. |
| Single-supply operation | Full 16-bit performance from 4.75–5.25 V - simplifies power architecture versus dual-rail ADCs requiring ±15 V. |
| Integrated reference | 2.5 V ±20 mV internal reference with <1 µA source current - reduces BOM count and PCB area vs. discrete reference ICs. |
| Overvoltage protection | ±25 V absolute max on VIN - withstands transient surges common in industrial sensor interfaces without external clamping. |
| Hi-Z data bus | Outputs enter high-impedance state when CS HIGH or R/C LOW - allows direct connection to shared microcontroller data buses. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Continuous monitoring of pressure, temperature, and flow transducers in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary ADC capturing 100 kSPS sensor data streams with guaranteed monotonicity and <±3 LSB INL for PID loop fidelity. Use Value: Eliminates external S/H and reference ICs while maintaining 15-bit effective linearity - reducing component count and calibration effort. |
Use Scenario: Digitizing calibrated analog signals in benchtop multimeters and waveform analyzers. IC Role / Device Role / Timing Role: High-accuracy front-end ADC with verified SNR (83 dB) and THD (–90 dB) at 20 kHz for metrology-grade measurements. Use Value: Factory-calibrated DC specs and comprehensive AC testing ensure traceable measurement uncertainty without user calibration. |
| Motor Drive Current Sensing | Medical Instrumentation |
|
Use Scenario: Isolated phase current sampling in servo drives using shunt resistors and isolation amplifiers. IC Role / Device Role / Timing Role: Bipolar-input ADC accepting ±10 V signals from isolated amplifiers, synchronized via BUSY-driven interrupt. Use Value: ±10 V range matches typical isolation amplifier outputs; 100 kSPS rate supports 10 kHz current loop bandwidths. |
Use Scenario: Analog front-end for patient-worn ECG and EEG recorders requiring low-power, high-linearity digitization. IC Role / Device Role / Timing Role: Low-noise 16-bit converter with 100 mW dissipation enabling battery-operated portable designs. Use Value: Single 5 V supply and integrated reference simplify power management; 83 dB SNR meets Class II medical signal fidelity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD974CR | 14-bit resolution, 100 kSPS, same SOIC-28 package and pinout - lacks internal reference and requires external 2.5 V source. | Suitable where 14-bit accuracy suffices and reference IC already exists in design - reduces cost but increases BOM complexity. | Select AD974CR only if system-level SNR budget allows 14-bit quantization noise and external reference is available. |
| ADS8505IPW | 16-bit, 250 kSPS, SPI interface, 5 V supply - no internal reference, higher power (125 mW), different 28-pin TSSOP package. | Preferred for space-constrained designs needing faster sampling and serial interface compatibility with modern MCUs. | Choose ADS8505IPW when board layout permits TSSOP and firmware supports SPI; avoid if parallel bus or internal reference is mandatory. |
Compared with AD976CR, AD974CR trades 2 bits of resolution for lower cost and identical footprint, while ADS8505IPW offers higher speed and serial interface at the expense of reference dependency and package incompatibility - making AD976CR optimal for legacy parallel-bus industrial systems requiring self-contained 16-bit accuracy.
Availability
AD976CR 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 and long production lifecycles.
Supply support for AD976CR 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 AD976 family was engineered for precision industrial data acquisition - delivering factory-calibrated 16-bit SAR performance with integrated reference and parallel interface to simplify high-accuracy analog front-end design.
FAQ
What is the maximum sampling rate supported by the AD976CR?
The AD976CR supports a maximum throughput rate of 100 kSPS, corresponding to a fixed 10 µs conversion time per sample. This rate is guaranteed across the full operating temperature range (–40°C to +85°C) and with either internal or external 2.5 V reference enabled. The AD976CR does not support the 200 kSPS mode - that capability is exclusive to AD976A-grade variants like AD976ACR.
Does the AD976CR require an external reference voltage?
No, the AD976CR includes a factory-trimmed internal 2.5 V reference (2.48 V to 2.52 V) that is sufficient for most industrial applications. External reference use is optional and only required when tighter initial accuracy (<±0.5%) or lower drift (<±2 ppm/°C) is needed - in which case a precision 2.3 V to 2.7 V source must be applied to the REF pin.
How is the AD976CR's analog input protected against overvoltage conditions?
The AD976CR VIN pin is rated for ±25 V absolute maximum input voltage, providing robust protection against transient surges common in industrial environments. This rating applies regardless of supply voltage or reference configuration. However, sustained overvoltage beyond ±10 V will saturate the ADC and may cause temporary data invalidity until recovery - full accuracy resumes within 150 ns after overvoltage removal.
Can the AD976CR interface directly with a microcontroller's GPIO bus?
Yes, the AD976CR's parallel 16-bit twos-complement output is TTL/CMOS-compatible and can connect directly to microcontroller GPIO banks. Its VOL (≤0.4 V at 1.6 mA) and VOH (≥4.0 V at 500 µA) meet standard 5 V logic thresholds. The high-impedance output state (enabled by CS HIGH or R/C LOW) allows safe bus sharing without external tri-state buffers.
What ground separation strategy is required for optimal AD976CR performance?
The AD976CR requires strict separation of AGND1 (reference ground), AGND2 (CAP ground), and DGND (digital ground), with all three tied together at a single star point beneath the device. AGND1 must serve as the reference for the analog input signal; routing VIN relative to any other ground introduces offset errors exceeding ±10 mV. This layout is mandatory to achieve specified bipolar zero error and full-scale linearity.
AD976CR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD976CR FAQ
1.How can I place an order for AD976CR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD976CR 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 AD976CR reliable?
The price and inventory of AD976CR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD976CR is usually 5 days.
3.What payment methods are accepted for AD976CR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD976CR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD976CR?
AD976CR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD976CR 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 AD976CR?
For technical support, including AD976CR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD976CR requirements.
6.How does Aetrix verify that AD976CR is sourced from the original manufacturer or authorized distributors?
All AD976CR 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 AD976CR meets industry standards.
7.What is the process for return or replacement of AD976CR?
All AD976CR units undergo pre-shipment inspection (PSI). If there is an issue with AD976CR, 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 AD976CR part is unused and in its original packaging.
Return procedure for AD976CR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD976CR Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
