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Analog Devices Inc. AD677KR-REEL
- Part No.:
- AD677KR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD677KR-REEL.pdf
- Description:
- IC ADC 16BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,676
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Product details
Overview
AD677KR-REEL from Analog Devices is a 16-bit, 100 kSPS autocalibrating successive-approximation ADC with integrated sample-hold, serial output (MSB-first, two's complement), ±5 V to ±10 V input range, and full-power bandwidth of 1 MHz. It operates from +5 V (VDD) and ±12 V (VCC/VEE) supplies and delivers 90 dB S/(N+D) and –99 dB THD at 100 kSPS for precision signal acquisition in instrumentation and data logging systems.
For engineers reviewing the AD677KR-REEL datasheet, AD677KR-REEL pinout, AD677KR-REEL application, or AD677KR-REEL equivalent, key selection considerations include its 28-pin SOIC package, on-chip autocalibration eliminating external trims, analog ground sense (AGND SENSE) for remote sensing, TTL-compatible digital I/O, and guaranteed 16-bit no-missing-codes performance across 0°C to +70°C.
Technical Context
The AD677KR-REEL implements a switched-capacitor charge-redistribution SAR architecture segmented across two monolithic dies-an analog BiMOS II ADC chip and a digital CMOS controller chip-housed in a single 28-lead SOIC package. Its autocalibration uses an on-chip microcontroller and calibration DAC to measure and correct capacitor mismatch errors for the top nine bits, storing correction values in RAM for subsequent conversions.
Conversion is initiated by a HIGH-to-LOW transition on SAMPLE after a minimum 2 µs sampling time; 17 CLK pulses execute the 16-bit conversion, with BUSY signaling active conversion/calibration. Serial output is synchronized to SCLK (derived from CLK), delivering two's complement data MSB first, with timing tightly specified for tFCD (50 ns), tCB (180–300 ns), and tCD (50–175 ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes-guarantees monotonicity and full dynamic range utilization. |
| Sampling Rate | 100 kSPS maximum-enables real-time capture of signals up to 50 kHz Nyquist bandwidth. |
| INL (Max) | ±1.5 LSB over temperature-ensures high dc accuracy without user calibration in measurement applications. |
| S/(N+D) | 90 dB typical at 100 kSPS-supports high-fidelity digitization of low-level signals in noisy environments. |
| Full Power Bandwidth | 1 MHz-allows accurate digitization of fast-rising transients and wideband sensor outputs. |
| Input Range | ±VREF (5 V to 10 V)-provides flexible scaling for bipolar industrial sensors and instrumentation front-ends. |
| Power Supply | +5 V (VDD), ±12 V (VCC/VEE)-separates analog and digital domains to minimize crosstalk and preserve SNR. |
Pinout & Package
AD677KR-REEL is housed in a 28-lead plastic small-outline IC (SOIC) package with gull-wing leads, 0.025" pitch, and JEDEC MS-012AC compliant footprint. Pin 1 is marked with a dot or bevelled corner; pins are numbered counterclockwise from pin 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SAMPLE (Pin 1) | Digital Input | Active-HIGH acquisition control; falling edge initiates conversion and freezes VIN sample after aperture delay. |
| CLK (Pin 2) | Digital Input | Master clock input; 17 rising edges required per conversion; also used to derive SCLK. |
| SDATA (Pin 3) | Digital Output | Serial two's complement output; MSB-first, synchronized to SCLK rising edge. |
| DGND (Pins 4, 5) | Power | Digital ground reference for VDD and logic I/O; must be isolated from AGND except at single-point star ground. |
| AGND (Pin 8) | Power | Analog ground reference for VCC, VEE, VIN, and VREF; primary return for analog circuitry. |
| AGND SENSE (Pin 15) | Analog Input | Remote analog ground sense connection-compensates for voltage drop between source and ADC ground. |
| VIN (Pin 16) | Analog Input | Differential input referenced to AGND; accepts ±VREF range with 50 pF input capacitance during sample. |
| VREF (Pin 17) | Analog Input | External reference input (5–10 V); sets full-scale range and directly impacts INL and gain error. |
| VEE (Pin 21) | Power | Negative analog supply (–12 V ±5%); powers internal comparator, DAC, and analog buffers. |
| VDD (Pins 22, 23) | Power | Positive digital supply (+5 V ±10%); powers controller, logic, and output drivers-separated to reduce digital noise coupling. |
| SCLK (Pin 26) | Digital Output | Derived clock for SDATA readout; synchronous with CLK but phase-adjusted for setup/hold compliance. |
| BUSY (Pin 27) | Digital Output | Active-HIGH status flag indicating ongoing conversion or calibration; used for handshaking and timing control. |
| CAL (Pin 28) | Digital Input | Asynchronous hardware reset and calibration trigger; HIGH resets internal state, LOW starts 85,532-clock-cycle calibration. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip autocalibration | Eliminates need for external trims or user calibration-corrects capacitor mismatch and offset errors in <86 ms, storing corrections in on-chip RAM. |
| Integrated sample-hold | Removes requirement for external SHA; achieves 2 µs input settling time and 100 ps aperture jitter for high-accuracy transient capture. |
| Separate analog/digital grounds | Reduces digital switching noise coupling into analog path-enables >90 dB S/(N+D) even with shared PCB layout. |
| Analog ground sense (AGND SENSE) | Compensates for IR drop in long sensor cables-maintains accuracy when signal source ground differs from ADC ground by up to ±100 mV. |
| TTL-compatible I/O | Supports direct interface to standard logic families and ADI DSPs without level-shifting-reduces BOM count and board space. |
Applications
| High-Accuracy Data Acquisition | Industrial Process Monitoring |
|---|---|
Use Scenario: Digitizing outputs from strain gauges, RTDs, and precision potentiometers in automated test equipment and calibration labs. IC Role / Device Role / Timing Role: Primary 16-bit ADC with integrated sample-hold and autocalibration-serves as the front-end digitizer in multi-channel DAQ systems. Use Value: ±1.5 LSB INL and 90 dB S/(N+D) ensure traceable metrology-grade measurements without periodic recalibration. | Use Scenario: Continuous monitoring of pressure, flow, and temperature in PLC-based factory automation systems operating over 0°C to +70°C. IC Role / Device Role / Timing Role: Bipolar input ADC interfacing to 4–20 mA transmitters via precision resistive conditioning networks. Use Value: AGND SENSE and ±12 V analog supplies enable robust operation in electrically noisy plant-floor environments. |
| Communications Signal Analysis | Medical Instrumentation |
Use Scenario: Capturing baseband IF signals in spectrum analyzers and software-defined radio receivers requiring wide dynamic range. IC Role / Device Role / Timing Role: High-fidelity digitizer for intermediate-frequency sampling-driven by stable system clock and buffered reference. Use Value: 1 MHz full-power bandwidth and –99 dB THD support clean capture of multi-tone signals without harmonic distortion artifacts. | Use Scenario: ECG and EEG front-ends where low-noise, high-linearity digitization of microvolt-level bio-signals is critical. IC Role / Device Role / Timing Role: Precision analog input stage-accepts differential sensor inputs, rejects common-mode noise, and provides calibrated 16-bit resolution. Use Value: On-chip autocalibration maintains accuracy across patient temperature variations and eliminates field service recalibration. |
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, ±10 V input, parallel + SPI interface; requires external reference and no autocalibration. | Multi-channel synchronized acquisition vs. single-channel high-SNR focus; higher channel density but larger footprint and higher power. | Select AD7606BSTZ when capturing multiple sensor channels with tight inter-channel timing alignment is required. |
| ADS8860IDRCT | 16-bit, 1 MSPS, pseudo-differential input, internal reference, SPI-only interface; no analog ground sense or bipolar zero calibration. | Higher speed and lower power, but limited to unipolar 0–VREF input and lacks remote ground compensation. | Select ADS8860IDRCT for battery-powered portable instruments needing >100 kSPS throughput and minimal external components. |
Compared with AD7606BSTZ and ADS8860IDRCT, the AD677KR-REEL uniquely combines autocalibration, analog ground sense, true bipolar input, and proven 100 kSPS/90 dB performance in a mature, temperature-stable SOIC package-making it optimal for legacy-replacement and high-reliability industrial measurement designs where dc accuracy and noise immunity are prioritized over speed or channel count.
Availability
AD677KR-REEL is available at Aetrix Electronics and suitable for high-accuracy data acquisition, industrial process monitoring, and medical instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for AD677KR-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.
The AD677KR-REEL belongs to Analog Devices' precision data converter product line, engineered specifically for demanding dc-accurate and ac-performance-critical measurement applications where autocalibration, noise immunity, and long-term stability are essential.
FAQ
What is the operating temperature range for the AD677KR-REEL?
The AD677KR-REEL is rated for commercial temperature operation from 0°C to +70°C. This grade is validated per the AD677K specification, with guaranteed 90 dB S/(N+D) and ±1.5 LSB INL across the full range. It does not meet industrial (–40°C to +85°C) or extended temperature specifications-those require AD677BD or AD677AD variants.
Does the AD677KR-REEL require an external voltage reference?
Yes, the AD677KR-REEL requires an external precision voltage reference applied to the VREF pin. It supports 5 V to 10 V inputs, and reference choice directly affects full-scale range, gain error, and INL. The device does not include an internal reference; recommended references include the REF02 or ADR421 for optimal performance.
How is autocalibration performed on the AD677KR-REEL?
Autocalibration on the AD677KR-REEL is initiated by driving CAL HIGH (asynchronous reset), then LOW. The internal microcontroller executes a fixed 85,532-clock-cycle routine that measures and corrects capacitor mismatch and offset errors for the top nine bits, storing correction values in on-chip RAM. Calibration must complete before reliable conversions begin.
What is the purpose of the AGND SENSE pin on the AD677KR-REEL?
The AGND SENSE pin (Pin 15) enables remote sensing of the analog ground potential at the signal source. By routing this trace alongside VIN, the AD677KR-REEL compensates for voltage drops in long cables or PCB traces-maintaining accuracy when source and ADC ground potentials differ by up to ±100 mV.
Can the AD677KR-REEL operate with a 3.3 V digital supply?
No, the AD677KR-REEL requires a +5 V ±10% digital supply (VDD) as specified in its absolute maximum and operating conditions. Using 3.3 V violates the VIH minimum (2.0 V) and VOH specification (VDD – 1 V), risking unreliable logic levels, metastability, and failure to drive SCLK/SDATA correctly. A dedicated +5 V regulator is mandatory.
AD677KR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-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:
- Serial
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- ±12V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD677KR-REEL FAQ
1.How can I place an order for AD677KR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD677KR-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 AD677KR-REEL reliable?
The price and inventory of AD677KR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD677KR-REEL is usually 5 days.
3.What payment methods are accepted for AD677KR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD677KR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD677KR-REEL?
AD677KR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD677KR-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 AD677KR-REEL?
For technical support, including AD677KR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD677KR-REEL requirements.
6.How does Aetrix verify that AD677KR-REEL is sourced from the original manufacturer or authorized distributors?
All AD677KR-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 AD677KR-REEL meets industry standards.
7.What is the process for return or replacement of AD677KR-REEL?
All AD677KR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD677KR-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 AD677KR-REEL part is unused and in its original packaging.
Return procedure for AD677KR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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