AD976ANZ - 16-Bit 100kSPS SAR ADC | Analog Devices | 28-PDIP
MPN: AD976ANZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $32.5 | $32.50 |
| 10 | $29.1 | $291.00 |
| 100 | $26.05 | $2,605.00 |
| 500 | $23.8 | $11,900.00 |
| 1,000 | $22.1 | $22,100.00 |
AD976ANZ Overview
An SAR ADC is a successive-approximation-register analog-to-digital converter that uses a binary search algorithm against an internal precision DAC to resolve N bits in N clock steps. SAR ADCs are a subtype of Nyquist-rate data converters that sit within the broader data acquisition IC category, which itself is part of the signal-chain and mixed-signal semiconductor hierarchy. Compared to delta-sigma ADCs, SAR converters offer lower latency, deterministic throughput, and no pipeline delay, which makes them preferable for multiplexed multi-channel acquisition and event-triggered sampling.
Key features include 100 kSPS guaranteed throughput, single 5 V supply operation, internal 2.5 V reference (with external reference override), and analog input range of ±10 V when using proper input scaling. The AD976ANZ integrates a high-speed parallel interface that directly connects to 16-bit microprocessors and DSPs, and includes flexible analog input conditioning for unipolar (0 V to 5 V or 0 V to 10 V) and bipolar (±5 V or ±10 V) ranges using a single +5 V supply. Throughput latency is negligible, which is critical for closed-loop control and multiplexed systems.
From an architecture standpoint, the AD976 and its higher-speed sibling AD976A share Analog Devices' proprietary BiCMOS process, combining bipolar precision devices with CMOS logic for low power and high accuracy. The device is offered in three pin-compatible packages - skinny 28-pin PDIP (this AD976ANZ variant), 28-pin SOIC, and 28-pin SSOP - giving designers flexibility for prototyping, volume production, or surface-mount reflow.
Typical applications include industrial process control, multi-channel data acquisition boards, instrumentation front-ends, and medical monitoring equipment. The 100 kSPS throughput is well matched to multiplexed analog input cards that sequentially sample multiple 12- or 16-bit channels. The wide analog input range also suits vibration, strain, and pressure measurement systems where high common-mode rejection is needed.
When designing with the AD976ANZ, place the analog input decoupling capacitor as close to the AIN pin as possible, maintain solid ground stitching between the analog and digital ground planes, and ensure the REFCAP pin is properly buffered with a 2.2 µF ceramic capacitor to minimize conversion noise.
This page synthesizes distributor pricing, drop-in compatible variants, and practical PCB layout guidance not found in the manufacturer datasheet - including a same-package, same-pinout comparison against the AD976A 200 kSPS upgrade path.
Drop-in alternatives for AD976ANZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD976ANZ (same form factor and footprint) — differing in Data Interface, Input Type, Internal Reference, Architecture, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD976AANZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD976ABNZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD976ACNZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD976ARS
✅ Drop-In📋 Reference alternative (not in catalog)
AD976ARSZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD976ANZ Maximum Ratings & Electrical Characteristics
| Resolution | 16 bit |
| Sampling Rate | 100 kSPS |
| Architecture | SAR (Successive Approximation) |
| Number of Inputs | 1 single-ended |
| Data Interface | Parallel |
| Supply Voltage (Analog) | 4.75 V to 5.25 V |
| Supply Voltage (Digital) | 4.75 V to 5.25 V |
| Input Type | Single-ended |
| Input Voltage Range | Unipolar 0-5V/0-10V, Bipolar ±5V/±10V (with scaling) |
| Maximum Power Dissipation | 100 mW |
| Operating Temperature Range | -40C to +85C |
| Package | 28-pin PDIP (N-28) |
| Mounting Type | Through-Hole (DIP) |
| Reference Type | Internal 2.5V (external override supported) |
| RoHS Status | Compliant (Pb-free N suffix) |
| Lead Free | Yes |
AD976ANZ Pin Configuration
| Pin 1 | AVIN — Analog input (single-ended) |
| Pin 2 | REFCAP — Reference bypass capacitor pin |
| Pin 3 | REF — 2.5V reference output / external reference input |
| Pin 4 | AGND1 — Analog ground |
| Pin 5 | AGND2 — Analog ground |
| Pin 6 | DVDD — Digital +5V supply |
| Pin 7 | DGND — Digital ground |
| Pin 8 | DB15 — Data bit 15 (MSB) |
| Pin 9 | DB14 — Data bit 14 |
| Pin 10 | DB13 — Data bit 13 |
| Pin 11 | DB12 — Data bit 12 |
| Pin 12 | DB11 — Data bit 11 |
| Pin 13 | DB10 — Data bit 10 |
| Pin 14 | DB9 — Data bit 9 |
| Pin 15 | DB8 — Data bit 8 |
| Pin 16 | DB7 — Data bit 7 |
| Pin 17 | DB6 — Data bit 6 |
| Pin 18 | DB5 — Data bit 5 |
| Pin 19 | DB4 — Data bit 4 |
| Pin 20 | DB3 — Data bit 3 |
| Pin 21 | DB2 — Data bit 2 |
| Pin 22 | DB1 — Data bit 1 |
| Pin 23 | DB0 — Data bit 0 (LSB) |
| Pin 24 | R/C — Read/Convert control input |
| Pin 25 | CS — Chip select (active low) |
| Pin 26 | BUSY — Busy output (high during conversion) |
| Pin 27 | AVDD — Analog +5V supply |
| Pin 28 | AGND3 — Analog ground |
Typical Applications
AD976ANZ is suitable for 6 applications: Industrial Process Control Data Acquisition, Multi-Channel Data Acquisition Boards (PC/104, USB, PXI), Medical Patient Monitoring Front-End, Vibration and Strain Gauge Measurement Systems, Industrial Automation Control Systems, Portable Test & Measurement Instrumentation.
Industrial Process Control Data Acquisition
The AD976ANZ is well-suited for industrial process-control cards that sequentially sample 4-16 channels of 4-20 mA or 0-10V sensor signals through an external analog multiplexer. Its 16-bit resolution gives a least-significant-bit step of 153 microvolts at the 5V unipolar full-scale range, and its 100 kSPS throughput permits channel-update rates of 6 kSPS per channel in a 16-channel system - sufficient for process variables such as temperature, pressure, and flow that update slowly. The BiCMOS switched-capacitor architecture provides excellent DC accuracy (typically ±2 LSB INL) needed for closed-loop PID control, while the single 5V supply simplifies isolated industrial power designs. The wide -40C to +85C operating range covers factory-floor environments.
Recommended
Multi-Channel Data Acquisition Boards (PC/104, USB, PXI)
Plug-in DAQ cards for PC/104, USB, or PXI form factors benefit from the AD976ANZ's parallel digital interface, which streams conversion data directly to a 16-bit system bus with negligible latency. The 100 kSPS throughput aggregates to several hundred kSPS aggregate when paired with an external 8- or 16-channel analog multiplexer, supporting instrumentation-grade DAQ boards priced for the industrial market. The single 5V analog and digital supply simplifies power-tree design on board modules with tight +5V/±12V/±15V budgets, and the 100 mW power dissipation is acceptable even in unventilated sealed enclosures. The wide input range (0-10V unipolar or ±10V bipolar with input scaling) covers most transducer and sensor outputs.
Recommended
Medical Patient Monitoring Front-End
The AD976ANZ's 16-bit resolution and 100 kSPS throughput match the requirements of patient-monitoring front-ends that digitize ECG, SpO2, temperature, and respiration channels simultaneously. The 5V single-supply operation keeps the analog signal chain simple and safe for IEC 60601-1 isolated designs, while the SAR architecture's zero pipeline delay is critical for ECG R-wave detection where sample-to-output latency must be sub-millisecond. The -40C to +85C operating range covers clinical environments, and the bipolar ±10V analog input range (with input scaling) accepts the full output span of typical ECG amplifier chains.
Recommended
Vibration and Strain Gauge Measurement Systems
Precision vibration analyzers and load-cell readout electronics require the 16-bit resolution and DC accuracy of the AD976ANZ to resolve sub-milligram strain-gauge bridge signals. The wide ±10V bipolar input range with proper scaling accepts the differential output of typical 350-ohm load-cell bridges excited at 10V, and the 100 kSPS throughput is more than sufficient for vibration analysis bandwidths up to 20 kHz. The SAR architecture's deterministic single-cycle conversion makes the AD976ANZ well-suited for triggered sampling of shock events and transient strain spikes, where pipeline-delay ADCs would smear the waveform. The internal 2.5V reference provides adequate stability for most industrial weighing applications, though a higher-precision external reference such as the AD780 may be used for laboratory-grade instrumentation.
Recommended
Industrial Automation Control Systems
PLC analog input modules and motor-control feedback subsystems use the AD976ANZ for digitizing analog setpoints, feedback signals, and encoder-derived analog outputs. Its 16-bit resolution gives the precision needed for servo-loop feedback (1 LSB at 10V full-scale = 153 microvolts), and the 100 kSPS throughput is more than enough for the typical 1-10 kHz update rates used in industrial motion control. The BiCMOS architecture's low power dissipation (100 mW max) supports dense PLC I/O cards with 8 or 16 ADC channels per board, and the 28-pin PDIP package simplifies prototype bring-up in through-hole industrial designs.
Recommended
Portable Test & Measurement Instrumentation
Handheld and benchtop test instruments use the AD976ANZ for digitizing multiple sensor inputs (voltage, current, temperature) with 16-bit accuracy. The wide analog input range (0-10V, ±5V, ±10V with scaling) covers typical probe and transducer outputs without external signal conditioning, and the single 5V operation simplifies battery-powered instrument designs. The SAR architecture provides instant conversion results on a single cycle, which is essential for digital multimeter-style displays that must update every few hundred milliseconds without visible lag. The 100 mW power dissipation suits handheld instruments where battery life is critical.
Recommended
Recommended Products Summary
Engineering reference data for AD976ANZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD976AANZ | AD976ABNZ | AD976ACNZ | AD976ARS | AD976ARSZ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-PDIP (N-28) | 28-PDIP (N-28) - same | 28-PDIP (N-28) - same | 28-PDIP (N-28) - same | 28-SOIC (R-28) | 28-SOIC (R-28) |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Sampling Rate | 100 kSPS | 200 kSPS (+100%) | 200 kSPS (+100%) | 200 kSPS (+100%) | 100 kSPS (same) | 100 kSPS (same) |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Mounting Type | Through-Hole (PDIP) | Through-Hole (PDIP) | Through-Hole (PDIP) | Through-Hole (PDIP) | Surface Mount (SOIC) | Surface Mount (SOIC) |
| Lead Free / RoHS | Yes / Compliant | Yes / Compliant | Yes / Compliant | Yes / Compliant | Yes / Compliant | Yes / Compliant |
Key Differentiators
- Pin-compatible 200 kSPS upgrade path within the same 28-pin PDIP (vs AD976AANZ)
- Through-hole 28-pin PDIP package for prototype-friendly industrial designs (vs AD976ARS / AD976ARSZ)
- Internal 2.5V reference with external override capability (vs External reference ADCs (e.g., AD677))
Design Notes
The AD976ANZ requires a clean +5V analog supply (AVDD, pin 27) and +5V digital supply (DVDD, pin 6). Use a ferrite bead or small inductor (e.g., BLM18PG221) between AVDD and the system +5V to isolate analog and digital return currents. Place a 10 µF tantalum bulk capacitor and a 0.1 µF ceramic decoupling cap as close as possible to each supply pin. The REFCAP pin (pin 2) MUST be bypassed with a 2.2 µF ceramic capacitor - omitting this cap will dramatically degrade linearity and increase noise.
Implement a star-ground topology with AGND1/AGND2/AGND3 (pins 4, 5, 28) tied together at a single point near the ADC and connected to the system ground plane. Keep digital return currents (DGND, pin 7) physically separate from the analog ground return path to avoid digital switching noise coupling into the analog input. Place the input signal traces on the analog ground side of the PCB and the parallel data bus traces on the digital ground side, with a guard trace between them. The 28-pin PDIP footprint gives designers generous space for proper analog/digital partitioning, which is harder in the SOIC variant.
Common pitfalls when using the AD976ANZ: (1) Driving the analog input directly with a high-impedance source - use an op-amp buffer such as the AD8055 or AD8628 to drive AVIN; (2) Reading data during conversion - the BUSY signal (pin 26) must be monitored and data read only after BUSY goes low; (3) Forgetting to apply R/C and CS timing - the conversion starts on the falling edge of R/C when CS is asserted; (4) Using long parallel data bus traces without series damping resistors - add 22-33 ohm resistors in series with each data line to reduce digital switching transients coupling into the analog input; (5) Driving AVDD/DVDD from the same unregulated supply without filtering - this part is sensitive to supply ripple, especially at the REFCAP pin.
To maintain 16-bit dynamic range (96 dB), keep the analog input bandwidth limited to less than half the sampling rate (Nyquist) by adding a passive anti-aliasing filter at the ADC input. A simple 2nd-order RC filter with fc = 30 kHz (R = 1 kohm, C = 5.6 nF) will adequately suppress aliasing for 100 kSPS operation. Keep the input trace length under 30 mm and use a ground guard trace on either side of the AVIN trace to prevent noise pickup. Place a small 10-100 pF capacitor (e.g., 33 pF NP0 ceramic) directly across AVIN to AGND to filter RF interference.
Compliance Information
RoHS compliant per the 'N' Pb-free suffix in AD976ANZ. AEC-Q100 not applicable - this is an industrial/consumer grade part. Halogen-free status not explicitly stated in the verified web data - set to 'unknown' per data authenticity rules.
