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Analog Devices Inc. AD977BRZ
- Part No.:
- AD977BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD977BRZ.pdf
- Description:
- IC ADC 16BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,120
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Product details
Overview
AD977BRZ 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 process control systems requiring stable dc accuracy and moderate-speed sampling.
For engineers reviewing the AD977BRZ datasheet, AD977BRZ pinout, AD977BRZ application, or AD977BRZ equivalent, this page delivers verified technical context, real-world timing behavior, confirmed package mapping to 20-lead SOIC, exact input range configuration options, and validated alternative parts with documented functional trade-offs.
Technical Context
The AD977BRZ implements a factory-calibrated switched-capacitor SAR architecture with internal clock generation and dual-mode serial data output-supporting either internal DATACLK (EXT/INT = LOW) or external clock synchronization (EXT/INT = HIGH). Its conversion control relies on R/C and CS signals, with BUSY indicating active conversion and pipeline delay ensuring results are only available after completion.
It supports binary two's complement or straight binary output coding via SB/BTC, daisy-chainable multi-device operation using TAG, and configurable reference sourcing (internal 2.48–2.52 V or external 2.3–2.7 V). 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 305 µV LSB step size for ±10 V full-scale input, enabling sub-millivolt measurement precision. |
| Throughput Rate | 100 kSPS - completes one full conversion cycle every 10 µs, suitable for medium-speed sensor monitoring and closed-loop control. |
| INL (Max) | ±3 LSB - ensures monotonicity and <0.005% full-scale linearity error over temperature, critical for calibration-sensitive instrumentation. |
| S/(N+D) | 83 dB typical - corresponds to ~13.5 effective bits at 20 kHz input, supporting high-fidelity signal capture in noise-constrained environments. |
| Power Dissipation | 100 mW max - enables thermally constrained PCB layouts without forced cooling in embedded industrial modules. |
| Power-Down Current | 50 µW - reduces system standby power by >99.9% while preserving last conversion result in shift register. |
| Analog Input Ranges | Configurable bipolar (±10 V, ±5 V, ±3.3 V) and unipolar (0–10 V, 0–5 V, 0–4 V) - eliminates need for external level-shifting circuitry in multi-range DAQ designs. |
Pinout & Package
AD977BRZ is packaged in a 20-lead narrow-body SOIC (SOIC_N) with standard 0.3-inch width and 0.050-inch lead pitch. Pin 1 is marked with a beveled corner or dot; leads are gull-wing formed for surface-mount reflow compatibility.
| 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; not multiplexed internally. |
| AGND1, AGND2 | Analog Ground References | Separate ground pins for REF and analog core-must be tied together at single-point star ground to minimize ground bounce and reference coupling. |
| CAP, REF | Reference Buffer Interface | CAP outputs buffered internal 2.5 V reference; REF accepts internal or external reference-both require 2.2 µF tantalum capacitor to AGND2 for stability. |
| SB/BTC | Data Format Select | Logic LOW selects two's complement output (for bipolar signals); HIGH selects straight binary (for unipolar signals)-no software configuration needed. |
| EXT/INT | Serial Clock Source Control | LOW enables internal DATACLK generation; HIGH enables external clock synchronization-determines whether SYNC is generated and timing dependency on host controller. |
| DATACLK, DATA, SYNC | Serial Interface Signals | DATACLK is bidirectional (input/output); DATA is MSB-first serial output; SYNC provides frame sync pulse only when EXT/INT = HIGH and external clock is active. |
| R/C, CS | Conversion & Read Control | R/C initiates sample-and-hold and conversion; CS enables serial read-both support flexible edge-triggered sequencing with ≥10 ns setup between falling edges. |
| BUSY, PWRD | Status & Power Management | BUSY goes LOW during conversion and returns HIGH upon result latching; PWRD = HIGH disables conversion and cuts power to analog section while retaining shift register contents. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Calibrated SAR Core | Eliminates field calibration for INL/DNL-guarantees ±3 LSB max INL and no missing codes across –40°C to +85°C without user adjustment. |
| Single 5 V Supply Operation | Removes need for dual ±15 V rails or isolated DC/DC converters-reduces BOM count and layout complexity in battery-powered or space-constrained systems. |
| Internal 2.5 V Reference | Stable 2.48–2.52 V output with ±2 ppm/°C drift-enables accurate absolute measurements without external voltage reference IC or trimming. |
| High-Speed Serial Interface | 16-bit MSB-first output synchronized to internal or external clock-reduces digital I/O count vs parallel ADCs and simplifies isolation or FPGA interfacing. |
| Power-Down Mode | 50 µW quiescent consumption with retained last conversion result-supports low-duty-cycle sensing in energy-harvesting or wireless sensor nodes. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Continuous acquisition of thermocouple, RTD, and strain gauge outputs in PLC-based control cabinets with ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: Primary 16-bit digitizer for analog sensor front-end; samples at 100 kSPS with 2 µs transient recovery to maintain loop update integrity after setpoint changes. Use Value: Delivers guaranteed monotonicity and ±3 LSB INL without recalibration-reducing firmware compensation overhead and improving long-term measurement repeatability. |
Use Scenario: Embedded digitizer in modular ATE mainframes performing parametric testing of op-amps, voltage references, and precision resistors. IC Role / Device Role / Timing Role: High-accuracy dc characterization engine; uses internal reference and bipolar ±10 V range to measure offset, gain, and linearity errors under automated test scripts. Use Value: Full dc specification coverage-including full-scale error drift ≤±7 ppm/°C and zero-error drift ≤±2 ppm/°C-ensures traceable metrology-grade test results. |
| Medical Instrumentation | Energy Metering Calibration |
|
Use Scenario: Signal conditioning path in portable ECG and EEG analyzers where low power and dc precision outweigh ultra-high speed requirements. IC Role / Device Role / Timing Role: Front-end ADC for filtered biopotential signals; operates in power-down mode between heartbeat-triggered acquisitions to extend battery life. Use Value: 50 µW power-down state and 100 mW active dissipation enable >24-hour runtime on coin-cell batteries while maintaining clinical-grade amplitude resolution. |
Use Scenario: Calibration verification stage in smart meter production lines, measuring reference shunt voltages and transformer secondary outputs under controlled lab conditions. IC Role / Device Role / Timing Role: Bench-level validation ADC; leverages unipolar 0–5 V range and internal 2.5 V reference to verify meter ADC gain/offset against NIST-traceable standards. Use Value: Guaranteed full-scale error ≤±0.5% and zero-error ≤±10 mV eliminate need for per-unit trim-accelerating final test throughput and reducing calibration labor cost. |
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, ±10 V input, external reference only, requires external power supplies and reference buffer. | Designed for multi-channel synchronized acquisition (e.g., motor phase current/voltage), not single-channel high-precision dc measurement. | Select AD7606BSTZ when capturing correlated analog signals across ≥2 channels with matched timing; AD977BRZ remains optimal for single-input, lowest-power, self-contained dc accuracy. |
| ADS8860IDRCT | 16-bit, 1 MSPS, SPI interface, external reference required, no internal clock, 1.8 V digital I/O, lower power (15 mW active). | Targets high-speed portable instrumentation with low-voltage microcontrollers; lacks bipolar input support and integrated reference. | Choose ADS8860IDRCT for battery-powered handheld meters needing >100 kSPS; AD977BRZ is preferred when ±10 V bipolar range, internal reference, and minimal external components are mandatory. |
Compared with AD7606BSTZ and ADS8860IDRCT, the AD977BRZ uniquely combines internal 2.5 V reference, bipolar/unipolar range flexibility, and 50 µW power-down in a single-supply 20-pin SOIC-making it the only option among the three that requires zero external reference or power-supply components for basic ±10 V dc measurement.
Availability
AD977BRZ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, medical instrumentation, and energy metering calibration requiring stable component supply, long-lifecycle availability, and guaranteed traceable sourcing.
Supply support for AD977BRZ 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 AD977BRZ belongs to Analog Devices' precision data acquisition product line, designed specifically for applications demanding guaranteed dc accuracy, low power, and simplified system integration without external reference or clock components.
FAQ
What is the maximum sampling rate supported by the AD977BRZ?
The AD977BRZ supports a maximum throughput rate of 100 kSPS, corresponding to a complete conversion cycle time of 10 µs. This is fixed for the AD977 variant (as opposed to the AD977A's 200 kSPS). The timing is governed by internal SAR architecture and factory calibration-no configuration or external clock adjustment can increase this rate. The AD977BRZ achieves this performance while maintaining ±3 LSB integral nonlinearity across its full operating temperature range.
Does the AD977BRZ require an external voltage reference?
No, the AD977BRZ does not require an external voltage reference. It integrates a precision 2.5 V internal reference with ±2 ppm/°C drift and 2.48 V to 2.52 V tolerance. The REF pin can be used to source this internal reference or accept an external 2.3 V–2.7 V reference-providing design flexibility without mandating external components. When using the internal reference, a 2.2 µF tantalum capacitor must be connected between CAP and AGND2 for stability.
How is the AD977BRZ interfaced to a microcontroller or FPGA?
The AD977BRZ interfaces via a high-speed serial protocol using R/C, CS, DATACLK, DATA, and SYNC signals. It supports two modes: internal clock (EXT/INT = LOW), where DATACLK is output and DATA is valid on both edges; or external clock (EXT/INT = HIGH), where DATACLK is input and SYNC provides frame alignment. No parallel bus or complex protocol stack is needed-the microcontroller simply toggles R/C and CS to initiate conversion and reads 16-bit MSB-first data synchronized to DATACLK.
What input voltage ranges does the AD977BRZ support?
The AD977BRZ supports six factory-configured input ranges: bipolar ±10 V, ±5 V, and ±3.3 V; and unipolar 0 V–10 V, 0 V–5 V, and 0 V–4 V. Range selection is implemented externally using resistor networks connected to R1IN/R2IN/R3IN per Table 8 in the datasheet-not via digital registers. Each range maintains full 16-bit resolution and specified dc accuracy, with zero-error drift ≤±2 ppm/°C and full-scale error drift ≤±7 ppm/°C.
Can the AD977BRZ operate in power-down mode while retaining conversion data?
Yes, the AD977BRZ retains the most recent conversion result in its internal shift register when PWRD is asserted HIGH. In this 50 µW power-down state, analog conversion is disabled, but the digital output stage remains active-allowing the host to read the last valid result at any time. Recovery to full accuracy after exiting power-down takes only 1 ms when a 2.2 µF capacitor is connected to CAP, enabling rapid wake-up for burst-mode acquisition without sacrificing measurement integrity.
AD977BRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD977BRZ FAQ
1.How can I place an order for AD977BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD977BRZ 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 AD977BRZ reliable?
The price and inventory of AD977BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD977BRZ is usually 5 days.
3.What payment methods are accepted for AD977BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD977BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD977BRZ?
AD977BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD977BRZ 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 AD977BRZ?
For technical support, including AD977BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD977BRZ requirements.
6.How does Aetrix verify that AD977BRZ is sourced from the original manufacturer or authorized distributors?
All AD977BRZ 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 AD977BRZ meets industry standards.
7.What is the process for return or replacement of AD977BRZ?
All AD977BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD977BRZ, 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 AD977BRZ part is unused and in its original packaging.
Return procedure for AD977BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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