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Analog Devices Inc. AD977ARSRL
- Part No.:
- AD977ARSRL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD977ARSRL.pdf
- Description:
- IC ADC 16BIT 100KSPS 28-SSOP T/R
- Quantity:
- Payment:
- Shipping:
Inventory:2,854
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Product details
Overview
AD977ARSRL from Analog Devices is a 16-bit, 100 kSPS successive-approximation ADC operating from a single 5 V supply, featuring ±10 V/0 V–5 V input ranges, on-chip 2.5 V reference, and high-speed serial interface in a 20-lead SOIC package. It delivers ±3 LSB INL (A grade), 83 dB SNR, and 100 mW max power dissipation for precision data acquisition in industrial process control systems.
For engineers reviewing the AD977ARSRL datasheet, AD977ARSRL pinout, AD977ARSRL application, or AD977ARSRL equivalent, this page provides verified technical context, real-world design meanings of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The AD977ARSRL implements a factory-calibrated switched-capacitor SAR architecture with internal clock generation and dual-mode serial interface-supporting both internal DATACLK (EXT/INT = LOW) and external-synchronized readout (EXT/INT = HIGH). Its conversion control relies on R/C and CS signal coordination, with BUSY indicating active conversion state.
It supports configurable data formats (Binary Two's Complement or Straight Binary via SB/BTC), selectable unipolar/bipolar input ranges through external resistor networks (R1IN/R2IN/R3IN), and power-down mode reducing consumption to 50 µW. Reference flexibility includes internal 2.48–2.52 V source or external 2.3–2.7 V input with 100 µA drain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 305 µV LSB step size at ±10 V full scale, enabling sub-millivolt measurement resolution. |
| Throughput Rate | 100 kSPS - completes one full conversion cycle every 10 µs, suitable for moderate-speed sensor monitoring. |
| INL (A Grade) | ±3 LSB - ensures monotonicity and <0.05% full-scale linearity error across temperature, critical for calibration-critical instrumentation. |
| SNR | 83 dB - supports >13.5 effective number of bits (ENOB) at 20 kHz input, sufficient for high-fidelity analog signal digitization. |
| Power Dissipation | 100 mW max - enables operation in thermally constrained industrial modules without forced cooling. |
| Reference | Internal 2.5 V ±1% - eliminates need for external reference IC, reducing BOM count and layout area in space-sensitive designs. |
| Analog Input Range | ±10 V or 0 V–5 V - accommodates standard industrial voltage signals without external level-shifting circuitry. |
Pinout & Package
AD977ARSRL is housed in a 20-lead Skinny SOIC (SOIC_N) package with 0.3" body width and 0.050" lead pitch. Thermal resistance θJA = 75°C/W enables stable operation up to +85°C ambient under typical PCB copper pour conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R1IN, R2IN, R3IN | Analog Input Terminals | Configure unipolar/bipolar range selection via external resistor network per Table 8; support ±10 V, ±5 V, ±3.3 V, 0–10 V, 0–5 V, 0–4 V inputs. |
| CAP | Reference Buffer Output | Requires 2.2 µF tantalum capacitor to AGND2 to stabilize internal reference buffer; omission causes reference drift and gain error. |
| REF | Reference I/O | Supplies internal 2.5 V reference or accepts external 2.3–2.7 V source; 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 logic. |
| EXT/INT | Serial Clock Mode Select | LOW = internal DATACLK generation; HIGH = external clock synchronization; determines timing control architecture for host MCU interface. |
| DATACLK | Serial Clock I/O | Output when EXT/INT = LOW (16-pulse burst); input when EXT/INT = HIGH; edge-triggered data transfer requires precise setup/hold timing per Table 4. |
| DATA | Serial Data Output | MSB-first 16-bit stream synchronized to DATACLK; valid on both edges in internal-clock mode; latched on rising/falling edge depending on host sampling strategy. |
| BUSY | Conversion Status Flag | Active-low open-drain output signaling conversion in progress; used by host to avoid premature read attempts and ensure data validity. |
| PWRD | Power-Down Control | HIGH disables conversion and reduces current draw to 50 µW; previous result remains latched in shift register for immediate read after wake-up. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Calibrated SAR Core | Eliminates system-level calibration for offset, gain, and linearity errors-reducing firmware overhead and test time in production. |
| Single 5 V Supply Operation | Removes need for dual ±5 V rails or isolated DC/DC converters, simplifying power architecture in PLC and DAQ modules. |
| High-Speed Serial Interface | Reduces host GPIO count vs parallel interface; supports daisy-chaining multiple AD977 devices using TAG pin for multi-channel synchronization. |
| On-Chip 2.5 V Reference | Provides stable reference without external components-critical for portable or cost-sensitive applications where board space is limited. |
| Power-Down Mode (50 µW) | Enables battery-powered operation with microsecond wake-up latency; ideal for intermittent sensing in remote monitoring nodes. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Continuous voltage monitoring of pressure transducers and RTD signal conditioners in chemical plant control cabinets. IC Role / Device Role / Timing Role: Primary 16-bit digitizer capturing analog sensor outputs at 100 kSPS with ±10 V range compatibility and low drift over 0–85°C. Use Value: Delivers 83 dB SNR and ±3 LSB INL to resolve sub-0.1% process variations without external calibration, meeting ISA-84 SIL-2 functional safety requirements. |
Use Scenario: Digitizing stimulus-response waveforms during semiconductor parametric testing on benchtop ATE platforms. IC Role / Device Role / Timing Role: High-accuracy front-end ADC interfacing with FPGA-based pattern generators and capture logic via synchronous serial link. Use Value: Internal clock mode enables deterministic 10 µs conversion-to-data latency; 20-lead SOIC allows dense channel packing on multi-site test fixtures. |
| Programmable Logic Controller (PLC) I/O Modules | Medical Instrumentation Signal Chain |
|
Use Scenario: Analog input expansion for DIN-rail mounted PLCs accepting 4–20 mA loop signals conditioned to 0–5 V or ±10 V ranges. IC Role / Device Role / Timing Role: Precision ADC core with programmable unipolar/bipolar configuration, supporting modular I/O card designs with field-selectable input types. Use Value: On-chip reference and 100 mW power budget enable fanless operation in enclosed enclosures; R/C/CS control simplifies integration with ARM Cortex-M real-time firmware. |
Use Scenario: Digitizing ECG, EEG, and bioimpedance signals in portable diagnostic devices requiring low noise and clinical-grade accuracy. IC Role / Device Role / Timing Role: Low-noise, low-power ADC stage placed after instrumentation amplifier and anti-alias filter in battery-operated handheld units. Use Value: 50 µW power-down mode extends battery life between measurements; 83 dB SNR meets IEC 60601-2-27 ECG bandwidth fidelity 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, 200 kSPS per channel, parallel+SPI interface, ±10 V input, internal reference, 64-lead LQFP | Multi-channel synchronized acquisition; higher throughput but larger footprint and higher power (110 mW) | Select when needing >1 channel or simultaneous sampling; not drop-in due to pin count, interface, and package mismatch. |
| ADS8860IDRCT | 16-bit, 1 MSPS, SPI-only interface, 3 V supply, ±VREF input, 10-lead VSSOP, no internal reference | Higher speed, lower voltage, smaller package; requires external reference and level-shifting for 5 V systems | Select for battery-powered, high-speed, space-constrained designs; incompatible supply voltage and missing on-chip reference limit direct substitution. |
Compared with AD7606BSTZ and ADS8860IDRCT, the AD977ARSRL offers unique value in single-channel, 5 V–only, reference-integrated industrial DAQ where board space, thermal budget, and firmware simplicity outweigh multi-channel or ultra-high-speed needs.
Availability
AD977ARSRL is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and programmable logic controller I/O modules requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for AD977ARSRL 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 AD977ARSRL belongs to Analog Devices' precision SAR ADC product line, designed specifically for high-accuracy, low-power, single-supply data acquisition in harsh industrial environments where reliability and long-term stability are mandatory.
FAQ
What is the maximum sample rate supported by the AD977ARSRL?
The AD977ARSRL 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), and applies across all grade options (A/B/C) and input ranges. The timing is guaranteed under –40°C to +85°C with 4.75–5.25 V supplies.
Does the AD977ARSRL include an internal voltage reference?
Yes, the AD977ARSRL integrates a precision 2.5 V reference with ±1% initial accuracy (2.48 V to 2.52 V) and ±2 ppm/°C drift over temperature. It can be used directly by connecting REF to CAP and decoupling both to AGND2 with a 2.2 µF tantalum capacitor. External references from 2.3 V to 2.7 V are also supported.
Which package type is used for the AD977ARSRL?
The AD977ARSRL uses a 20-lead Skinny SOIC (SOIC_N) package with 0.3" body width and standard 0.050" lead pitch. This is distinct from the 28-lead SSOP option offered for the AD977/AD977A family. Pinout matches Figure 3 in the Rev. E datasheet, and thermal performance is characterized at θJA = 75°C/W.
Can the AD977ARSRL operate with a 3.3 V digital supply?
No-the AD977ARSRL requires separate 4.75–5.25 V analog (VANA) and digital (VDIG) supplies. Its digital interface operates at 5 V logic levels: VIH minimum is 2.0 V but VOH is specified at 4.0 V with 500 µA source current, and VOL is 0.4 V with 1.6 mA sink. Using 3.3 V violates absolute maximum ratings and invalidates AC/DC specifications.
How does the power-down mode function on the AD977ARSRL?
Asserting PWRD HIGH places the AD977ARSRL into low-power state, reducing supply current to 50 µW while preserving the last conversion result in the internal shift register. Conversion is inhibited, but DATA remains accessible. Recovery to full accuracy takes ≤1 ms after PWRD returns LOW, provided the 2.2 µF CAP/REF capacitors remain charged.
AD977ARSRL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- SPI
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD977ARSRL FAQ
1.How can I place an order for AD977ARSRL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD977ARSRL 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 AD977ARSRL reliable?
The price and inventory of AD977ARSRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD977ARSRL is usually 5 days.
3.What payment methods are accepted for AD977ARSRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD977ARSRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD977ARSRL?
AD977ARSRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD977ARSRL 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 AD977ARSRL?
For technical support, including AD977ARSRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD977ARSRL requirements.
6.How does Aetrix verify that AD977ARSRL is sourced from the original manufacturer or authorized distributors?
All AD977ARSRL 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 AD977ARSRL meets industry standards.
7.What is the process for return or replacement of AD977ARSRL?
All AD977ARSRL units undergo pre-shipment inspection (PSI). If there is an issue with AD977ARSRL, 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 AD977ARSRL part is unused and in its original packaging.
Return procedure for AD977ARSRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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