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Analog Devices Inc. AD977ARZ-REEL
- Part No.:
- AD977ARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD977ARZ-REEL.pdf
- Description:
- IC ADC 16BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,245
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Product details
Overview
AD977ARZ-REEL 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 factory-calibrated linearity, on-chip 2.5 V reference, high-speed serial interface, and power-down mode consuming only 50 µW - deployed in precision industrial data acquisition systems requiring ±10 V bipolar input range and stable dc accuracy.
For engineers reviewing the AD977ARZ-REEL datasheet, AD977ARZ-REEL pinout, AD977ARZ-REEL application, or AD977ARZ-REEL equivalent, key selection considerations include its 100 kSPS throughput, ±3 LSB integral nonlinearity (A-grade), 83 dB SNR at 20 kHz, 20-lead SOIC package, and support for both internal/external clocking with SYNC frame synchronization.
Technical Context
The AD977ARZ-REEL implements a switched-capacitor SAR architecture with integrated reference buffer and serial output register. Its conversion control relies on dual digital inputs (R/C and CS), supporting internal clock generation or external DATACLK synchronization with optional SYNC pulse generation.
It supports configurable input ranges (±10 V, ±5 V, ±3.3 V, 0–10 V, 0–5 V, 0–4 V) via external resistor networks, and offers selectable data coding (Binary Two's Complement or Straight Binary) via SB/BTC pin. Aperture delay is fixed at 40 ns, and transient response to full-scale step is 2 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 305 µV LSB step size over ±10 V range, enabling sub-millivolt measurement fidelity. |
| Throughput Rate | 100 kSPS - completes full conversion cycle in 10 µs, suitable for medium-speed process monitoring. |
| INL (A Grade) | ±3 LSB - ensures monotonicity and <0.05% full-scale linearity error across temperature (–40°C to +85°C). |
| SNR / THD | 83 dB / –90 dB - supports >13.5 ENOB for clean spectral analysis in instrumentation applications. |
| Power Dissipation | 100 mW max active, 50 µW in power-down - enables low-thermal-load designs in space-constrained modules. |
| Analog Input Range | Configurable ±10 V, ±5 V, ±3.3 V, or 0–10 V, 0–5 V, 0–4 V - eliminates need for external signal conditioning in multi-range systems. |
| Reference | Internal 2.5 V ±2 mV (2.48–2.52 V), or external 2.3–2.7 V - allows precision calibration without external reference IC. |
| Package | 20-lead SOIC (R-20) - industry-standard footprint compatible with automated PCB assembly and thermal management up to 700 mW. |
Pinout & Package
AD977ARZ-REEL is housed in a 20-lead narrow-body SOIC (SOIC_N) package with standard 0.3-inch body width and 0.050-inch lead pitch. Pin 1 is marked by a beveled corner or dot; leads are gull-wing shaped for reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R1IN, R2IN, R3IN (Pins 1,3,4) | Analog input terminals | Configure unipolar/bipolar input range via external resistor network per Table 8; accept ±25 V absolute max. |
| CAP (Pin 5) | Reference buffer output | Requires 2.2 µF tantalum capacitor to AGND1 for internal reference stability; critical for INL performance. |
| REF (Pin 6) | Reference I/O | Supplies internal 2.5 V reference or accepts external 2.3–2.7 V source; must be decoupled to AGND2 with 2.2 µF. |
| AGND1, AGND2 (Pins 2,7) | Analog ground references | Separate ground returns for REF/CAP (AGND1) and analog core (AGND2); must be tied at single point to minimize noise coupling. |
| SB/BTC (Pin 8) | Data format select | LOW = Two's complement output (bipolar), HIGH = Straight binary (unipolar); sets MSB interpretation for host processor. |
| EXT/INT (Pin 9) | Serial clock source select | LOW = internal DATACLK generation; HIGH = external DATACLK sync; determines timing control architecture. |
| DGND (Pin 10) | Digital ground | Isolated return for digital I/O; must be connected to system DGND plane, separate from AGND except at star point. |
| SYNC (Pin 11) | Frame sync output | Active-high pulse (1 DATACLK period wide) indicating start of 16-bit data frame during external clock mode. |
| DATACLK (Pin 12) | Serial clock I/O | Output when EXT/INT = LOW; input when EXT/INT = HIGH; data valid on both edges in internal mode. |
| DATA (Pin 13) | Serial data output | MSB-first 16-bit result; level holds TAG state between conversions; requires proper setup/hold relative to DATACLK. |
| TAG (Pin 14) | Daisy-chain tag input | Injected into DATA stream after 16–17 DATACLK cycles; enables multi-ADC time-aligned readout on shared bus. |
| R/C (Pin 15) | Read/Convert control | Falling edge initiates sample-and-hold and conversion; rising edge enables serial data output; defines conversion trigger. |
| CS (Pin 16) | Chip select | Falling edge with R/C LOW starts conversion; with R/C HIGH enables data readout; supports microprocessor interfacing. |
| BUSY (Pin 17) | Conversion status indicator | Active-low open-drain output; LOW during conversion (≤8 µs), HIGH when result latched and ready for readout. |
| PWRD (Pin 18) | Power-down enable | HIGH disables conversion and reduces supply current to 50 µW; retains last conversion result in shift register. |
| VANA (Pin 19) | Analog supply | 4.75–5.25 V; powers analog core and reference; requires local 0.1 µF + 10 µF decoupling to AGND2. |
| VDIG (Pin 20) | Digital supply | 4.75–5.25 V; powers logic and serial interface; requires local 0.1 µF + 10 µF decoupling to DGND. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-calibrated SAR architecture | Eliminates system-level INL calibration; guarantees ±3 LSB max INL (A grade) over full temperature range. |
| Single 5 V supply operation | Removes need for dual ±5 V rails or LDO sequencing; simplifies power design while maintaining 83 dB SNR. |
| High-speed serial interface | 16-bit MSB-first output with programmable clocking (internal/external), SYNC framing, and TAG daisy-chaining. |
| Configurable input ranges | Supports six standard unipolar/bipolar ranges via external resistors - no external op-amp gain stages required. |
| Low-power power-down mode | Reduces quiescent current to 50 µW while preserving last conversion result - ideal for battery-backed data loggers. |
| On-chip 2.5 V reference | Stable 2.48–2.52 V output with <2 ppm/°C drift; eliminates external reference IC and associated layout complexity. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Continuous voltage/current sensing in PLC analog input modules measuring motor feedback, pressure transducers, and thermocouple signals. IC Role / Device Role / Timing Role: Primary 16-bit ADC capturing synchronized multi-channel samples at 100 kSPS with ±10 V full-scale range. Use Value: Factory-calibrated INL ensures <0.05% measurement uncertainty without field recalibration, reducing maintenance cost. |
Use Scenario: DC parametric testing of semiconductor devices requiring precise voltage sourcing and measurement under bias conditions. IC Role / Device Role / Timing Role: High-accuracy digitizer for force-measure voltage readings with programmable unipolar/bipolar range switching. Use Value: Internal 2.5 V reference and ±3 LSB INL enable traceable metrology-grade measurements without external calibration hardware. |
| Scientific Instrumentation | Energy Metering Reference Design |
|
Use Scenario: Low-noise data acquisition in benchtop oscilloscopes and spectrum analyzers where harmonic distortion impacts FFT resolution. IC Role / Device Role / Timing Role: Front-end ADC delivering 83 dB SNR and –90 dB THD for clean baseband signal capture. Use Value: 85 dB typical S/(N+D) at 20 kHz supports >13.5 ENOB - sufficient for 14-bit effective resolution in lab-grade instruments. |
Use Scenario: Calibration reference channel in polyphase energy meters validating metrology IC accuracy against known standards. IC Role / Device Role / Timing Role: Precision verification ADC sampling voltage transformers at 100 kSPS with ±0.5% full-scale error tolerance. Use Value: Guaranteed ±0.5% full-scale error and ±10 mV zero error ensure compliance with IEC 62053-22 Class 0.2 accuracy 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 |
|---|---|---|---|
| AD7606BSTZ | 8-channel simultaneous-sampling, 16-bit, 200 kSPS, ±10 V input, internal reference, parallel + serial interface | Replaces discrete multiplexed ADCs in multi-sensor systems; higher channel count but larger 64-lead LQFP package | Select AD7606BSTZ when multi-channel synchronized acquisition is required; AD977ARZ-REEL remains optimal for single-channel, space-constrained, low-pin-count designs. |
| ADS8860IDRCT | 16-bit, 1 MSPS, SPI interface, external reference only, 10-lead VSSOP, 15 mW active power | Targets portable/high-speed applications; lacks internal reference and bipolar input support | Choose ADS8860IDRCT for battery-powered, high-throughput systems needing minimal power; AD977ARZ-REEL suits mains-powered industrial systems requiring ±10 V bipolar input and internal reference. |
Compared with AD7606BSTZ and ADS8860IDRCT, the AD977ARZ-REEL uniquely balances single-channel precision (±3 LSB INL), integrated 2.5 V reference, ±10 V bipolar capability, and compact SOIC packaging - making it the preferred choice for cost-sensitive, board-space-limited industrial DAQ nodes where multi-channel sync is unnecessary.
Availability
AD977ARZ-REEL is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, scientific instrumentation, and energy metering reference designs requiring stable component supply and long-term obsolescence management.
Supply support for AD977ARZ-REEL 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, automotive, communications, and healthcare markets since 1965.
The AD977ARZ-REEL belongs to Analog Devices' precision data acquisition product line, engineered for high-accuracy, medium-speed industrial and instrumentation applications where dc linearity, reference integration, and robust serial interfacing are critical.
FAQ
What is the maximum throughput rate of the AD977ARZ-REEL?
The AD977ARZ-REEL achieves a maximum throughput rate of 100 kSPS, completing each full conversion cycle in 10 µs. This is confirmed in the AD977 specifications table (Rev. E, Table 1), where "Throughput Rate" is specified as 100 kHz across all A/B/C grades. The AD977A variant supports 200 kSPS, but AD977ARZ-REEL is the 100 kSPS version.
Does the AD977ARZ-REEL include an internal voltage reference?
Yes, the AD977ARZ-REEL integrates a precision 2.5 V internal reference with a typical value of 2.50 V and a guaranteed range of 2.48 V to 2.52 V (±2 mV). It can be used directly via the REF pin or overridden by an external 2.3–2.7 V source. The internal reference is buffered at the CAP pin, requiring a 2.2 µF tantalum capacitor to AGND1 for stability.
What package type is used for the AD977ARZ-REEL?
The AD977ARZ-REEL is packaged in a 20-lead narrow-body SOIC (SOIC_N) with standard 0.3-inch body width and 0.050-inch lead pitch. This is explicitly stated in the "Features" section and confirmed in the "Outline Dimensions" section (Page 32) of the Rev. E datasheet. The "RZ" suffix denotes the SOIC package, and "-REEL" indicates tape-and-reel packaging.
Can the AD977ARZ-REEL operate with bipolar input ranges?
Yes, the AD977ARZ-REEL supports bipolar input ranges of ±10 V, ±5 V, and ±3.3 V, as well as unipolar ranges of 0–10 V, 0–5 V, and 0–4 V. Configuration is achieved using external resistor networks connected to R1IN/R2IN/R3IN pins, as detailed in Tables 7 and 8 of the datasheet. Bipolar zero error is specified at ±10 mV (A grade).
How does the power-down mode function on the AD977ARZ-REEL?
When the PWRD pin is driven HIGH, the AD977ARZ-REEL enters power-down mode, reducing total supply current to 50 µW while retaining the last conversion result in its internal shift register. Conversion is inhibited, but the serial interface remains accessible. Recovery to full accuracy takes 1 ms when a 2.2 µF capacitor is connected to CAP, as specified in Table 1 under "Recovery to Rated Accuracy After Power-Down".
AD977ARZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -
AD977ARZ-REEL FAQ
1.How can I place an order for AD977ARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD977ARZ-REEL 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 AD977ARZ-REEL reliable?
The price and inventory of AD977ARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD977ARZ-REEL is usually 5 days.
3.What payment methods are accepted for AD977ARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD977ARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD977ARZ-REEL?
AD977ARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD977ARZ-REEL 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 AD977ARZ-REEL?
For technical support, including AD977ARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD977ARZ-REEL requirements.
6.How does Aetrix verify that AD977ARZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD977ARZ-REEL 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 AD977ARZ-REEL meets industry standards.
7.What is the process for return or replacement of AD977ARZ-REEL?
All AD977ARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD977ARZ-REEL, 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 AD977ARZ-REEL part is unused and in its original packaging.
Return procedure for AD977ARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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