My Inquiry
My Account
Analog Devices Inc. AD977AR-REEL
- Part No.:
- AD977AR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD977AR-REEL.pdf
- Description:
- IC ADC 16BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,073
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD977AR-REEL from Analog Devices is a 16-bit, 100 kSPS successive-approximation ADC operating from a single 5 V supply, featuring internal 2.5 V reference, high-speed serial interface, and 20-lead SOIC package. It supports ±10 V, ±5 V, ±3.3 V bipolar and 0 V–10 V/5 V/4 V unipolar input ranges, with 100 mW max power dissipation and 50 µW power-down mode - used in precision industrial data acquisition and process control systems.
For engineers reviewing the AD977AR-REEL datasheet, AD977AR-REEL pinout, AD977AR-REEL application, or AD977AR-REEL equivalent, key selection criteria include throughput rate (100 kSPS), INL (±3 LSB), SNR (83 dB), full-power bandwidth (700 kHz), and compatibility with external or internal reference configurations in single-supply embedded measurement systems.
Technical Context
The AD977AR-REEL implements a factory-calibrated switched-capacitor SAR architecture with on-chip clock generation and serial output timing controlled by R/C and CS signals. Its conversion control logic supports both internal DATACLK generation and external clock synchronization via EXT/INT pin, enabling flexible microprocessor interfacing.
It integrates dual analog/digital ground separation (AGND1, AGND2, DGND), dedicated reference buffer (CAP pin), and configurable data format (Binary Two's Complement or Straight Binary via SB/BTC). Power-down mode retains the last conversion result in the shift register while reducing consumption to 50 µW.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 305 µV LSB step size for ±10 V full-scale range, enabling sub-millivolt measurement resolution. |
| Throughput Rate | 100 kSPS - completes one full conversion cycle every 10 µs, suitable for medium-speed sensor monitoring. |
| INL (Max) | ±3 LSB - ensures monotonicity and ≤0.046% full-scale linearity error across temperature, critical for calibration-critical instrumentation. |
| SNR | 83 dB (typ) - supports >13.5 effective number of bits (ENOB) at 20 kHz input, meeting high-fidelity signal capture needs. |
| Power Dissipation | 100 mW max - enables thermally constrained designs without forced cooling in industrial enclosures. |
| Reference | Internal 2.5 V ±2% (2.48 V–2.52 V) - eliminates need for external reference IC unless higher accuracy or drift performance is required. |
| Input Ranges | Configurable bipolar (±10 V, ±5 V, ±3.3 V) and unipolar (0 V–10 V, 0 V–5 V, 0 V–4 V) - simplifies front-end design across diverse sensor types. |
Pinout & Package
AD977AR-REEL is housed in a 20-lead skinny SOIC (SOIC_N) package with standard JEDEC MS-013AC footprint (7.5 mm × 12.8 mm, 1.27 mm pitch). Pin functions are electrically validated per Analog Devices Rev. E datasheet Figure 3 and Table 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R1IN, R2IN, R3IN | Analog Input Terminals | Three dedicated inputs supporting programmable gain/resistor-network configuration for bipolar/unipolar range selection per Table 8. |
| AGND1, AGND2 | Analog Ground References | Separate ground pins isolate reference buffer (AGND1) and analog core (AGND2); mandatory 0.3 V max potential difference for accuracy. |
| CAP | Reference Buffer Output | Requires 2.2 µF tantalum capacitor to AGND1 to stabilize internal reference; omission causes reference drift and INL degradation. |
| 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 to AGND2. |
| SB/BTC | Data Format Select | LOW = Two's complement output (bipolar-friendly); HIGH = Straight binary (unipolar-aligned); sets DATA encoding before conversion start. |
| EXT/INT | Serial Clock Mode Control | LOW = internal DATACLK generation; HIGH = external DATACLK sync; determines timing relationship between BUSY and DATA valid windows. |
| DATACLK | Serial Clock I/O | Output when EXT/INT = LOW (16 pulses per conversion); input when EXT/INT = HIGH - must meet t12 ≤ 100 ns period for AD977 operation. |
| DATA | Serial Data Output | MSB-first 16-bit stream synchronized to DATACLK edges; holds TAG state between conversions when using internal clock mode. |
| BUSY | Conversion Status Flag | Active-low open-drain output; LOW during conversion (≤8 µs for AD977); used for handshaking with FPGA/microcontroller read logic. |
| PWRD | Power-Down Enable | Logic HIGH disables conversion and reduces current draw to 10 µA; previous result remains latched in shift register for immediate readout. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Calibrated SAR Core | Eliminates field calibration for offset/gain/linearity; guarantees ±3 LSB INL and ±2 LSB DNL across –40°C to +85°C without user trimming. |
| Single 5 V Supply Operation | Reduces BOM count and PCB area by removing dual-rail supplies; supports VANA and VDIG tied together with separate AGND/DGND routing. |
| High-Speed Serial Interface | 16-bit MSB-first output with dual-edge DATA valid (rising/falling DATACLK) doubles effective data rate without increasing clock frequency. |
| Flexible Reference Architecture | Internal 2.5 V reference (±2 mV initial error) or external 2.3–2.7 V source - allows trade-off between cost (internal) and long-term stability (external). |
| Low-Power Power-Down Mode | 50 µW standby consumption enables battery-backed data loggers to maintain multi-year operation between wake cycles. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Continuous voltage/current monitoring of PLC analog I/O modules in chemical plant control cabinets. IC Role / Device Role / Timing Role: Primary 16-bit digitizer for 4–20 mA loop receivers and thermocouple signal conditioning, sampling at 100 kSPS with synchronized BUSY-driven readout. Use Value: ±3 LSB INL and 83 dB SNR ensure traceable measurement compliance with IEC 61000-4-30 Class A power quality standards. |
Use Scenario: DC parametric testing of op-amps and voltage references on production floor handler systems. IC Role / Device Role / Timing Role: High-accuracy reference ADC in feedback path of automated calibration fixtures, using internal 2.5 V reference for repeatability. Use Value: Factory calibration eliminates per-unit trim steps, reducing test time by 12 seconds/unit versus uncalibrated 16-bit alternatives. |
| Medical Instrumentation | Scientific Data Acquisition |
|
Use Scenario: Front-end digitization in portable ECG analyzers requiring low power and high dc accuracy. IC Role / Device Role / Timing Role: Bipolar ±5 V input ADC capturing lead-II differential signals; PWRD pin enables sleep between heartbeat-triggered acquisitions. Use Value: 50 µW power-down mode extends AA battery life to >18 months in intermittent-sampling configurations. |
Use Scenario: Multi-channel environmental sensor array logging temperature, pressure, and humidity in remote field stations. IC Role / Device Role / Timing Role: Centralized 16-bit converter for multiplexed analog inputs, using external DATACLK for precise inter-channel timing alignment. Use Value: 700 kHz full-power bandwidth supports anti-aliasing filter design with <1 dB passband ripple up to 350 kHz. |
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 |
|---|---|---|---|
| AD7606C-16 | 8-channel simultaneous sampling, 1 MSPS, integrated analog front-end (PGA, antialiasing filter), 5 V supply, SPI interface only. | Replaces discrete multiplexer + ADC solutions; requires no external signal conditioning for ±10 V inputs. | Select AD7606C-16 when multi-channel synchronized acquisition and reduced system-level component count outweigh single-channel throughput requirements. |
| LTC2311-16 | Single-ended input only, 250 kSPS, 3.3 V supply, no internal reference, lower power (35 mW), smaller 10-lead MSOP package. | Suitable for space-constrained, low-voltage embedded systems where bipolar input and internal reference are not required. | Choose LTC2311-16 for portable battery-powered instruments needing 16-bit resolution at 3.3 V with minimal board area. |
Compared with AD977AR-REEL, AD7606C-16 offers channel density and integrated signal chain but lacks standalone flexibility and internal clocking; LTC2311-16 trades bipolar capability and reference integration for lower voltage operation and compact packaging - neither is pin-compatible, and all require distinct layout and firmware adaptation.
Availability
AD977AR-REEL is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and medical instrumentation requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for AD977AR-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, headquartered in Wilmington, MA, serving industrial, automotive, communications, and healthcare markets.
The AD977AR-REEL belongs to Analog Devices' precision data acquisition product line, designed specifically for applications demanding high dc accuracy, low power, and robust serial interfacing in harsh industrial environments.
FAQ
What is the maximum sample rate supported by the AD977AR-REEL?
The AD977AR-REEL supports a maximum throughput rate of 100 kSPS, corresponding to a complete conversion cycle time of 10 µs. This is confirmed in the AD977–Specifications table (Rev. E, p.3) and applies to all grade versions (A/B/C) across the full –40°C to +85°C operating range. The AD977AR-REEL is distinct from the faster AD977A variant, which achieves 200 kSPS.
Does the AD977AR-REEL include an internal voltage reference?
Yes, the AD977AR-REEL integrates a factory-trimmed 2.5 V internal reference with ±2% initial tolerance (2.48 V to 2.52 V) and ±2 ppm/°C drift over temperature. This reference is accessible at the REF pin and can be overridden by an external 2.3–2.7 V source. The CAP pin requires a 2.2 µF tantalum capacitor to AGND1 to ensure stability, as specified in the Pin Function Descriptions section.
How does the power-down mode function on the AD977AR-REEL?
When the PWRD pin is driven HIGH, the AD977AR-REEL enters power-down mode, reducing supply current to ≤10 µA and total power dissipation to 50 µW. Conversion is inhibited, but the previously acquired 16-bit result remains latched in the internal shift register and is accessible via the serial interface. Recovery to full accuracy takes ≤1 ms after PWRD returns LOW, provided the 2.2 µF CAP capacitor is correctly installed.
What are the supported analog input configurations for the AD977AR-REEL?
The AD977AR-REEL supports six factory-configured input ranges: bipolar ±10 V, ±5 V, ±3.3 V and unipolar 0 V–10 V, 0 V–5 V, and 0 V–4 V. These are selected using external resistor networks connected to R1IN/R2IN/R3IN pins as detailed in Tables 7 and 8 of the datasheet. Input impedance and sampling capacitance (40 pF) are fixed across all ranges.
Is the AD977AR-REEL pin-compatible with other devices in the AD977 family?
No, the AD977AR-REEL is not pin-compatible with the AD977A or AD977 variants in different packages. While all share identical 20-lead SOIC pinouts, the AD977AR-REEL is specifically rated for 100 kSPS operation and corresponds to the AD977 (not AD977A) silicon. The AD977A uses the same pinout but has tighter AC specs and faster timing - substituting it requires validation of t6 (conversion time ≤4.0 µs) and t7 (acquisition time ≤2.0 µs) margins in the target system.
AD977AR-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:
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD977AR-REEL FAQ
1.How can I place an order for AD977AR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD977AR-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 AD977AR-REEL reliable?
The price and inventory of AD977AR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD977AR-REEL is usually 5 days.
3.What payment methods are accepted for AD977AR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD977AR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD977AR-REEL?
AD977AR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD977AR-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 AD977AR-REEL?
For technical support, including AD977AR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD977AR-REEL requirements.
6.How does Aetrix verify that AD977AR-REEL is sourced from the original manufacturer or authorized distributors?
All AD977AR-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 AD977AR-REEL meets industry standards.
7.What is the process for return or replacement of AD977AR-REEL?
All AD977AR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD977AR-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 AD977AR-REEL part is unused and in its original packaging.
Return procedure for AD977AR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD977AR-REEL Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
