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

Analog Devices Inc. AD977BNZ

Name: AD977BNZ
Brand: Analog Devices Inc.
SKU: AD977BNZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD977BNZ

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 20-DIP (0.300", 7.62mm)

Datasheet:: AD977BNZ.pdf

Description:: IC ADC 16BIT SAR 20DIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AD977BNZ from Analog Devices is a 16-bit, 100 kSPS successive-approximation analog-to-digital converter (ADC) operating from a single 5 V supply. It features ±10 V/±5 V/±3.3 V bipolar and 0 V–10 V/0 V–5 V/0 V–4 V unipolar input ranges, on-chip 2.5 V reference, high-speed serial interface, and power-down mode consuming only 50 µW. It is used in precision industrial data acquisition systems requiring stable dc accuracy and low-power operation.

For engineers reviewing the AD977BNZ datasheet, AD977BNZ pinout, AD977BNZ application, or AD977BNZ equivalent, this page delivers verified specifications, package mapping, functional pin roles, real-world use cases, and validated alternative options - all grounded in Analog Devices' Rev. E datasheet and official pin configuration documentation.

Technical Context

The AD977BNZ implements a factory-calibrated switched-capacitor SAR architecture with internal clock generation and dual-mode serial data output (internal or external DATACLK). Its conversion control relies on R/C and CS signals, supporting both continuous and discontinuous clocking modes with SYNC frame synchronization when using external clocks.

It integrates a 2.5 V internal reference (±2 mV initial tolerance), supports external reference override (2.3 V to 2.7 V), and provides binary two's complement or straight binary output formatting via SB/BTC. Aperture delay is fixed at 40 ns, and transient response to full-scale step is 2 µs across all grades.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	16-bit - delivers 1 LSB = 305 µV for ±10 V full-scale range, enabling sub-millivolt measurement fidelity.
Throughput Rate	100 kSPS - completes one full conversion cycle every 10 µs, suitable for medium-speed process monitoring.
INL (Max)	±3 LSB - ensures monotonicity and <0.005% full-scale linearity error over temperature, critical for calibration-critical systems.
Power Dissipation	100 mW max - enables thermally constrained embedded designs without forced cooling.
Power-Down Current	50 µW - reduces standby power by >2000×, ideal for battery-backed or intermittent-sampling applications.
Reference Options	Internal 2.5 V (±0.2%) or external 2.3 V–2.7 V - allows system-level reference sharing or enhanced stability via precision external source.
Input Ranges	Configurable bipolar (±10 V, ±5 V, ±3.3 V) and unipolar (0–10 V, 0–5 V, 0–4 V) - eliminates external signal conditioning for multiple sensor types.

Pinout & Package

AD977BNZ is packaged in a 20-lead skinny SOIC (SOIC_N) with 0.3" body width and standard 0.050" lead pitch. Pin layout matches Figure 3 of Rev. E datasheet.

Pin/Terminal	Circuit Role	Design Meaning
R1IN, R2IN, R3IN	Analog Input Terminals	Three dedicated analog inputs supporting selectable unipolar/bipolar ranges via external resistor networks per Table 8.
AGND1, AGND2	Analog Ground Returns	Separate ground pins isolate reference and analog circuitry to minimize noise coupling into conversion path.
CAP	Reference Buffer Output	Requires 2.2 µF tantalum capacitor to AGND2 to stabilize internal reference buffer; omission causes reference drift and INL degradation.
REF	Reference I/O	Provides internal 2.5 V reference or accepts external reference; must be decoupled with 2.2 µF capacitor to AGND2.
SB/BTC	Data Format Select	LOW = two's complement output (for bipolar signals); HIGH = straight binary (for unipolar signals); sets MSB interpretation.
EXT/INT	Serial Clock Mode Select	LOW = internal DATACLK generation; HIGH = external DATACLK synchronization with SYNC framing support.
DGND	Digital Ground	Isolated return for digital I/O to prevent digital switching noise from modulating analog conversion accuracy.
SYNC	Frame Sync Output	Active-high pulse synchronized to external DATACLK, indicating start of 16-bit data frame during EXT/INT = HIGH mode.
DATACLK	Serial Clock I/O	Output (EXT/INT = LOW) or input (EXT/INT = HIGH); data valid on both edges in internal mode; rising-edge latched in external mode.
DATA	Serial Data Output	MSB-first 16-bit result; level held at TAG state between conversions; supports daisy-chaining via TAG in multi-ADC systems.
TAG	Daisy-Chain Tag Input	Drives DATA output after 16–17 DATACLK cycles in EXT/INT = HIGH mode, enabling time-aligned readout from multiple AD977BNZ devices.
R/C	Read/Convert Control	Falling edge initiates sample-and-hold + conversion when CS is LOW; rising edge enables serial readout when CS is HIGH.
CS	Chip Select	Enables conversion start (R/C LOW) or serial readout (R/C HIGH); internal OR logic with R/C allows flexible control sequencing.
BUSY	Conversion Status Flag	Active-low open-drain output; LOW during conversion and data latching; used for handshaking with microcontrollers or FPGAs.
PWRD	Power-Down Enable	HIGH disables conversion and reduces current to 50 µW; previous conversion result remains latched in shift register for immediate readout.
VANA	Analog Supply	4.75 V–5.25 V nominal; requires local 0.1 µF + 10 µF decoupling to AGND2 to maintain SNR >83 dB.
VDIG	Digital Supply	4.75 V–5.25 V nominal; separate from VANA to avoid digital noise injection into analog section.

Key Features

Feature	Design Value
Factory-Calibrated SAR Core	Eliminates need for user calibration; guarantees ±3 LSB INL and ±2 LSB DNL across –40°C to +85°C without trimming.
Single 5 V Supply Operation	Removes requirement for dual ±15 V or split-rail supplies, simplifying power design and reducing BOM count in industrial PLC modules.
High-Speed Serial Interface	Reduces PCB trace count vs. parallel ADCs; 16-bit data transmitted in ≤10 µs (AD977BNZ), easing FPGA/microcontroller GPIO constraints.
Configurable Input Ranges	Hardware-selectable via external resistors (no software reconfiguration needed) supports direct connection to strain gauges, RTDs, and 4–20 mA loops.
On-Chip Reference with External Override	Enables self-contained operation or system-level reference synchronization-critical for multi-channel coherent sampling in DAQ systems.
Power-Down Mode with Data Retention	Maintains last conversion result in shift register during 50 µW sleep, allowing instant wake-up and readout without conversion latency penalty.

Applications

Industrial Process Monitoring	Automated Test Equipment (ATE)
Use Scenario: Continuous voltage/current monitoring of reactor temperature sensors, pressure transducers, and flow meters in chemical plants. IC Role / Device Role / Timing Role: Precision front-end ADC capturing slow-varying analog signals at 100 kSPS with guaranteed monotonicity and <15 ppm/°C full-scale drift. Use Value: Enables direct digitization of ±10 V industrial sensor outputs without external op-amp gain stages or reference buffers, reducing component count and calibration overhead.	Use Scenario: DC parametric testing of ICs and passive components requiring accurate voltage/current measurements under programmable bias conditions. IC Role / Device Role / Timing Role: High-accuracy measurement engine providing calibrated 16-bit readings with <±0.5% full-scale error and <100 ns aperture uncertainty. Use Value: Delivers traceable metrology-grade results without external calibration hardware, shortening test setup time and improving repeatability across ATE platforms.
Programmable Logic Controller (PLC) Analog Input Modules	Scientific Instrumentation Data Loggers
Use Scenario: Modular I/O cards in DIN-rail mounted PLCs acquiring analog field signals from 4–20 mA transmitters and thermocouples. IC Role / Device Role / Timing Role: Isolated analog input channel ADC with configurable unipolar/bipolar ranges and robust ESD-tolerant inputs (±25 V absolute max). Use Value: Supports universal input configuration via resistor network selection, eliminating need for multiple SKUs and simplifying inventory management for OEMs.	Use Scenario: Portable environmental monitors logging temperature, humidity, and air quality sensor outputs over extended periods on battery power. IC Role / Device Role / Timing Role: Low-power acquisition node performing periodic 100 kSPS bursts followed by 50 µW deep-sleep intervals between samples. Use Value: Extends battery life by >10× versus always-on ADCs while preserving full 16-bit resolution and dc accuracy during active measurement windows.

Industrial Process Monitoring

Automated Test Equipment (ATE)

Use Scenario: Continuous voltage/current monitoring of reactor temperature sensors, pressure transducers, and flow meters in chemical plants.

IC Role / Device Role / Timing Role: Precision front-end ADC capturing slow-varying analog signals at 100 kSPS with guaranteed monotonicity and <15 ppm/°C full-scale drift.

Use Value: Enables direct digitization of ±10 V industrial sensor outputs without external op-amp gain stages or reference buffers, reducing component count and calibration overhead.

Use Scenario: DC parametric testing of ICs and passive components requiring accurate voltage/current measurements under programmable bias conditions.

IC Role / Device Role / Timing Role: High-accuracy measurement engine providing calibrated 16-bit readings with <±0.5% full-scale error and <100 ns aperture uncertainty.

Use Value: Delivers traceable metrology-grade results without external calibration hardware, shortening test setup time and improving repeatability across ATE platforms.

Programmable Logic Controller (PLC) Analog Input Modules

Scientific Instrumentation Data Loggers

Use Scenario: Modular I/O cards in DIN-rail mounted PLCs acquiring analog field signals from 4–20 mA transmitters and thermocouples.

IC Role / Device Role / Timing Role: Isolated analog input channel ADC with configurable unipolar/bipolar ranges and robust ESD-tolerant inputs (±25 V absolute max).

Use Value: Supports universal input configuration via resistor network selection, eliminating need for multiple SKUs and simplifying inventory management for OEMs.

Use Scenario: Portable environmental monitors logging temperature, humidity, and air quality sensor outputs over extended periods on battery power.

IC Role / Device Role / Timing Role: Low-power acquisition node performing periodic 100 kSPS bursts followed by 50 µW deep-sleep intervals between samples.

Use Value: Extends battery life by >10× versus always-on ADCs while preserving full 16-bit resolution and dc accuracy during active measurement windows.

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
AD7606BSTZ	8-channel simultaneous-sampling, 16-bit, 200 kSPS, integrated PGA and anti-alias filter; requires ±5 V analog supply and external reference.	Designed for multi-channel synchronized acquisition (e.g., motor phase current sensing), not single-channel high-precision standalone use.	Select AD7606BSTZ when multi-input correlation or on-chip signal conditioning is required; AD977BNZ remains optimal for cost-sensitive, single-channel, low-power applications.
ADS8860IDRCT	16-bit, 1 MSPS, SPI interface, internal reference, 1.8 V–3.6 V supply; lower power (15 mW) but no bipolar input support and narrower input range (0–VREF).	Targeted at portable, battery-powered systems with unipolar-only sensors and aggressive power budgets; lacks industrial-grade voltage ranges and ESD robustness.	Choose ADS8860IDRCT for ultra-low-power, high-throughput unipolar applications; AD977BNZ is preferred where ±10 V input, 5 V compatibility, or industrial grounding isolation are mandatory.

Compared with AD7606BSTZ and ADS8860IDRCT, the AD977BNZ uniquely balances single-channel precision, bipolar/unipolar flexibility, 5 V simplicity, and industrial-grade robustness - making it the optimal choice for legacy-compatible, space-constrained, and thermally limited industrial DAQ nodes.

Availability

AD977BNZ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and programmable logic controller analog input modules requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for AD977BNZ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets.

The AD977BNZ belongs to Analog Devices' precision SAR ADC product line, engineered for high-accuracy, low-power, single-supply data acquisition in harsh industrial environments where dc integrity and long-term stability are non-negotiable.

FAQ

What is the maximum throughput rate of the AD977BNZ?

The AD977BNZ achieves a maximum throughput rate of 100 kSPS, completing each full conversion cycle in 10 µs. This is confirmed in Table 1 of the Rev. E datasheet under "AD977–SPECIFICATIONS" and applies to all grade variants (A/B/C) across the full –40°C to +85°C operating range. The AD977BNZ is distinct from the faster AD977A (200 kSPS), and its timing parameters-including t6 (conversion time) and t7 (acquisition time)-are optimized for this 100 kSPS performance point.

Does the AD977BNZ support both bipolar and unipolar input configurations?

Yes, the AD977BNZ supports both bipolar (±10 V, ±5 V, ±3.3 V) and unipolar (0 V–10 V, 0 V–5 V, 0 V–4 V) input ranges, as specified in Tables 1 and 8 of the Rev. E datasheet. Configuration is achieved via external resistor networks connected to R1IN/R2IN/R3IN pins-not through software registers-ensuring deterministic, hardware-defined signal conditioning without firmware dependencies.

What reference options does the AD977BNZ provide?

The AD977BNZ offers dual reference capability: an internal 2.5 V reference (2.48 V to 2.52 V, ±0.2% initial tolerance) and support for external reference voltages from 2.3 V to 2.7 V. The REF pin serves as both output (internal mode) and input (external mode), and a 2.2 µF tantalum capacitor must be placed between REF and AGND2 in either configuration to ensure stability and meet specified INL and THD performance.

How does the power-down mode function in the AD977BNZ?

When the PWRD pin is driven HIGH, the AD977BNZ enters power-down mode, reducing supply current to 50 µW while retaining the most recent conversion result in its internal shift register. Conversion is inhibited, but the stored 16-bit value remains accessible via the serial interface. Recovery to full accuracy requires 1 ms after PWRD returns LOW and a 2.2 µF capacitor is connected to CAP, as documented in Table 1's "Recovery to Rated Accuracy After Power-Down" parameter.

Can the AD977BNZ interface directly with a microcontroller SPI port?

No, the AD977BNZ does not implement standard SPI protocol. Its serial interface uses a custom timing scheme with DATACLK, DATA, SYNC, and control pins (R/C, CS, EXT/INT), requiring bit-banged GPIO or FPGA logic for synchronization. It supports both internal clock generation (EXT/INT = LOW) and external clock framing (EXT/INT = HIGH with SYNC), but lacks MOSI/MISO/SS signals or CPOL/CPHA configuration-making native SPI peripheral integration impossible without protocol translation.

AD977BNZ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 20-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Number of Bits:: 16

Sampling Rate (Per Second):: 100k

Number of Inputs:: 1

Input Type:: Single Ended

Data Interface:: SPI

Configuration:: ADC

Ratio - S/H:ADC:: -

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:: 20-PDIP

Mounting Type:: Through Hole

Grade:: -

Qualification:: -

AD977BNZ FAQ

1.How can I place an order for AD977BNZ through Aetrix?

Please submit a Request for Quotation (RFQ) for AD977BNZ 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 AD977BNZ reliable?

The price and inventory of AD977BNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD977BNZ is usually 5 days.

3.What payment methods are accepted for AD977BNZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD977BNZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD977BNZ?

AD977BNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD977BNZ 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 AD977BNZ?

For technical support, including AD977BNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD977BNZ requirements.

6.How does Aetrix verify that AD977BNZ is sourced from the original manufacturer or authorized distributors?

All AD977BNZ 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 AD977BNZ meets industry standards.

7.What is the process for return or replacement of AD977BNZ?

All AD977BNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD977BNZ, 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 AD977BNZ part is unused and in its original packaging.

Return procedure for AD977BNZ:

1.Submit a request within 90 days.

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

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