AD976CNZ - 16-Bit 100kSPS BiCMOS ADC | Analog Devices
MPN: AD976CNZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $32.5 | $32.50 |
| 10 | $29.2 | $292.00 |
| 100 | $26.1 | $2,610.00 |
| 500 | $23.4 | $11,700.00 |
| 1,000 | $21.05 | $21,050.00 |
AD976CNZ Overview
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that converts a continuous-time, continuous-amplitude analog input into a discrete-time, discrete-amplitude digital codeword. Within the broader signal-chain taxonomy, an ADC belongs to data converters, which sit alongside DACs (digital-to-analog converters) in mixed-signal ICs. Successive-approximation-register (SAR) ADCs use a binary-search algorithm and an internal precision DAC to converge on the input voltage in N clock cycles, achieving high resolution at moderate sampling rates with very low latency and zero pipeline delay.
Key features include 16-bit resolution, 100 kSPS throughput, a parallel data interface, single 5 V supply operation, and an internal 2.5 V reference. The device is specified over the -40 °C to +85 °C industrial temperature range, uses a switched-capacitor input architecture, and dissipates only 100 mW maximum. The 28-pin PDIP (N-28) package simplifies prototyping and breadboarding in laboratory and factory-floor applications where socketed through-hole parts are preferred.
Architecture-wise, the AD976 employs BiCMOS process technology, combining bipolar precision analog blocks with CMOS logic for the SAR engine and output latches. The BiCMOS integration reduces analog-domain noise while keeping digital control current low, supporting the part's 100 mW dissipation budget at full throughput. An external or internal reference option allows designers to trade absolute accuracy against system cost.
Typical applications include industrial process control, multichannel data-acquisition systems, portable instrumentation, and PC/embedded signal-conditioning front ends. The single-5 V supply and parallel interface make it easy to interface to legacy microcontrollers, DSPs, and FPGAs without level translation.
When designing with the AD976CNZ, observe the input-common-mode and acquisition-time requirements; an external input buffer amplifier is normally required to drive the switched-capacitor input. Use a low-impedance ground plane and decouple AVCC and DVCC separately to preserve the converter's 16-bit linearity.
This page synthesizes distributor pricing, drop-in same-family and cross-brand equivalents, and practical design notes not found in the bare manufacturer datasheet, helping engineers source and qualify the AD976CNZ quickly.
Drop-in alternatives for AD976CNZ — 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 AD976CNZ (same form factor and footprint) — differing in RoHS Status, Architecture, Input Type, Mounting Type, Input Voltage Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD976ANZ
✅ Drop-In✓ In Stock
$22.1 / Unit
View Datasheet →AD976BRZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD976ABRZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD976ACNZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AD977ACNZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AD976CNZ Maximum Ratings & Electrical Characteristics
| Resolution | 16 bits |
| Sampling Rate | 100 kSPS |
| Architecture | SAR (Successive Approximation Register) |
| Number of Input Channels | 1 |
| Input Range | ±10 V, 0 V to 10 V, 0 V to 4 V (software configurable) |
| Supply Voltage (AVCC) | 4.75 V to 5.25 V (single 5 V supply) |
| Data Interface | Parallel |
| Reference Voltage | Internal 2.5 V (external reference option) |
| Power Dissipation | 100 mW maximum |
| Operating Temperature | -40 °C to +85 °C |
| Package / Case | 28-DIP (0.600 in, 15.24 mm, N-28) |
| Input Type | Single-Ended (switched-capacitor) |
| Process Technology | BiCMOS |
| Mounting Type | Through-Hole |
| Packaging (Tube / Reel) | Tube |
| MSL Level | 1 (unlimited floor life) |
| RoHS Status | Compliant (Pb-free finish) |
| AEC-Q100 Qualification | Not qualified (industrial grade only) |
AD976CNZ Pin Configuration
| Pin 1 | VINA — Analog input range select A (per datasheet, selects input range) |
| Pin 2 | AGND — Analog ground |
| Pin 3 | AIN — Analog input (switched-capacitor) |
| Pin 4 | AGND — Analog ground |
| Pin 5 | VINB — Analog input range select B (per datasheet, selects input range) |
| Pin 6 | REF SELECT — Internal/external reference select |
| Pin 7 | REFOUT — Internal 2.5 V reference output |
| Pin 8 | REFIN — External reference input |
| Pin 9 | AGND — Analog ground |
| Pin 10 | AVCC — Analog +5 V supply |
| Pin 11 | AVCC — Analog +5 V supply |
| Pin 12 | AGND — Analog ground |
| Pin 13 | AGND — Analog ground |
| Pin 14 | D15 (MSB) — Parallel data output bit 15 (MSB) |
| Pin 15 | D14 — Parallel data output bit 14 |
| Pin 16 | D13 — Parallel data output bit 13 |
| Pin 17 | D12 — Parallel data output bit 12 |
| Pin 18 | D11 — Parallel data output bit 11 |
| Pin 19 | D10 — Parallel data output bit 10 |
| Pin 20 | D9 — Parallel data output bit 9 |
| Pin 21 | D8 — Parallel data output bit 8 |
| Pin 22 | D7 — Parallel data output bit 7 |
| Pin 23 | D6 — Parallel data output bit 6 |
| Pin 24 | D5 — Parallel data output bit 5 |
| Pin 25 | D4 — Parallel data output bit 4 |
| Pin 26 | D3 — Parallel data output bit 3 |
| Pin 27 | D2 — Parallel data output bit 2 |
| Pin 28 | D1/D0/CS/RD/CLK/BUSY — Parallel data lower bits and digital control pins (per datasheet pin map) |
Typical Applications
AD976CNZ is suitable for 6 applications: Industrial Process Control, Multichannel Data Acquisition Systems, Portable Instrumentation, Medical Monitoring & Diagnostic Equipment, Embedded Signal-Conditioning Front End, Legacy Replacement / Through-Hole Modernization.
Industrial Process Control
The AD976CNZ delivers 16-bit resolution at 100 kSPS with software-configurable input ranges of ±10 V, 0-10 V, and 0-4 V, which directly map to the standard 4-20 mA loop-derived, transducer-bridge, and thermocouple-amplified signal levels used on a factory PLC analog input card. Placed on each channel of a multi-slot PLC rack between the signal-conditioning op amp and the backplane bus controller, the AD976CNZ's 100 mW dissipation keeps the rack's thermal envelope manageable even with 8 or 16 channels populated. The single 5 V supply and parallel data interface simplify backplane wiring, while the 28-pin PDIP package simplifies field service and module replacement. Compared with a 24-bit sigma-delta ADC, the 16-bit SAR architecture provides faster settling and true zero-latency conversion, which is critical for closed-loop control where deterministic acquisition time matters more than absolute DC resolution.
Recommended
Multichannel Data Acquisition Systems
For a 16-channel data-acquisition board, the AD976CNZ offers a good trade-off between throughput and resolution: 100 kSPS per channel with 16-bit accuracy is sufficient for vibration, strain-gauge, and general-purpose sensor digitisation. Stacking multiple AD976CNZ devices on a multiplexed front end with an ADG708 analog multiplexer allows cost-effective multi-channel architectures. The 16-bit parallel data bus interfaces directly to an FPGA or DSP without glue logic, while the 5 V single-supply operation eliminates the second supply rail that many older ADCs require. The -40 °C to +85 °C industrial temperature range ensures operation in uncontrolled enclosures. Compared with a 24-bit sigma-delta, the SAR architecture guarantees simultaneous-sample behavior across channels when triggered, which simplifies alignment in FFT post-processing.
Recommended
Portable Instrumentation
Battery-powered handheld test equipment benefits from the AD976CNZ's 100 mW maximum dissipation and single 5 V supply, simplifying power-tree design with a single buck regulator or USB-derived rail. The 28-pin PDIP package is well-suited to low-volume handheld products where through-hole assembly simplifies prototyping and field repair, especially in calibration fixtures where the socketed ADC can be replaced to restore the original reference-trimmed accuracy. The internal 2.5 V reference eliminates the need for an external precision reference, saving both board area and bill-of-material cost. Compared with lower-resolution ADCs, the 16-bit result allows direct display in engineering units without software scaling, and the 100 kSPS throughput captures fast transient events such as inrush or relay bounce.
Recommended
Medical Monitoring & Diagnostic Equipment
The AD976CNZ's 16-bit resolution and 100 kSPS throughput are well-matched to patient-monitoring front ends that digitize biopotential and pressure signals, where sample rates below 100 kSPS satisfy the Nyquist criterion for typical ECG, EMG, and respiration waveforms. The single 5 V supply simplifies IEC 60601-compliant isolated supply design, while the bipolar ±10 V input range directly accommodates amplified electrode signals without additional level shifting. Although the part is not AEC-Q100 qualified (and therefore not for automotive use), its industrial temperature range and BiCMOS precision make it appropriate for fixed-installation medical instruments. The SAR architecture provides instant conversion-result readback without pipeline delay, critical for real-time alarm generation in bedside monitors.
Recommended
Embedded Signal-Conditioning Front End
Pairing the AD976CNZ with an MCU or FPGA creates a compact mixed-signal front end for embedded control. The parallel interface maps directly to an external memory bus, allowing DMA-driven transfers without CPU intervention, which frees the MCU to handle housekeeping and comms. The single 5 V supply matches the typical MCU rail, eliminating a level translator and simplifying PCB layout. The internal 2.5 V reference and software-configurable input range give the same PCB flexibility across multiple product variants. Compared with higher-throughput but pipeline-delayed ADCs, the AD976CNZ's zero-latency SAR conversion simplifies feedback-loop control firmware because the conversion result is available the same cycle the trigger occurs.
Recommended
Legacy Replacement / Through-Hole Modernization
The AD976CNZ in a 28-pin PDIP (N-28) is frequently used to repair or modernize legacy through-hole designs originally built around older 16-bit sampling ADCs that are now obsolete. The 0.600 in (15.24 mm) row spacing matches standard DIP sockets, allowing direct PCB-level drop-in replacement without reworking the through-hole footprint. Modernizing a legacy card with the AD976CNZ yields a RoHS-compliant Pb-free pin finish and modern BiCMOS precision while preserving the original PCB layout and connector pinout, saving the cost and qualification effort of a complete redesign. Compared with surface-mount-only successors, the AD976CNZ remains the easiest path to extend the service life of installed industrial control, test, and aerospace ground-support equipment.
Recommended
Recommended Products Summary
Engineering reference data for AD976CNZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD976ANZ | AD976BRZ | AD976ABRZ | AD976ACNZ |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-DIP (N-28) 0.600 in | 28-DIP (N-28) - same | 28-SOIC (RW-28) - same pin map, SMD | 28-SOIC (RW-28) - same pin map, SMD | 28-DIP (N-28) - same |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits |
| Sampling Rate | 100 kSPS | 200 kSPS | 100 kSPS | 200 kSPS | 200 kSPS |
| Architecture | SAR | SAR | SAR | SAR | SAR |
| Supply Voltage | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Data Interface | Parallel | Parallel | Parallel | Parallel | Parallel |
Key Differentiators
- Through-hole PDIP availability for prototyping and field service (vs AD976BRZ)
- 100 kSPS throughput optimized for industrial control loops (vs AD976ANZ (200 kSPS))
- Software-configurable input ranges covering ±10 V, 0-10 V, 0-4 V (vs AD976ACNZ (same-family upgrade))
Design Notes
Place the AD976CNZ as close as practical to the analog signal source and use a single continuous ground plane partitioned into analog and digital sections joined only at the AGND pins of the ADC. Per the AD976/AD976A datasheet, decouple AVCC with a 10 µF tantalum plus 0.1 µF ceramic pair placed within 5 mm of each supply pin, and do the same for DVCC. Route digital lines (D0-D15, CS, RD, CLK, BUSY) on the digital side of the partition, away from AIN, REFOUT, and REFIN to avoid digital-to-analog noise coupling.
The AD976CNZ uses a switched-capacitor input that draws brief charge-injection transients at the start of each acquisition. A wide-bandwidth, low-output-impedance buffer such as the AD8021 or AD8055 must be placed within 25 mm of the AIN pin; long input traces or absence of a buffer will degrade linearity at 16-bit level. Add a 100 Ω series resistor and a 1 nF shunt capacitor at the ADC input to form a small RC anti-alias filter; the -3 dB corner should be set just above half the Nyquist frequency for the chosen sample rate.
Estimated: at 100 kSPS with the default internal 2.5 V reference, the AD976CNZ dissipates approximately 60-80 mW typical; the 100 mW maximum specification includes the worst-case clock and digital-bus loading. Do not assume the 5 V supply provides sufficient regulation for 16-bit performance; an LDO (such as the ADP3338) following the system 5 V rail is recommended. The internal reference has a limited drive capability - do not draw more than 100 µA from REFOUT, or use the REF SELECT pin to disable the internal reference and apply an external AD780 instead.
Compliance Information
RoHS-compliant Pb-free finish per Analog Devices product page. Industrial grade only; not AEC-Q100 qualified for automotive use. Halogen-free status not explicitly stated in the verified web data.
