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Analog Devices Inc. AD677KRZ-REEL
- Part No.:
- AD677KRZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD677KRZ-REEL.pdf
- Description:
- IC ADC 16BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,470
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Product details
Overview
AD677KRZ-REEL from Analog Devices is a 16-bit, 100 kSPS autocalibrating successive-approximation ADC with on-chip sample-hold, serial output, ±5 V to ±10 V input range, and 92 dB S/(N+D) - used in precision instrumentation, data acquisition systems, and industrial process monitoring.
For engineers reviewing the AD677KRZ-REEL datasheet, AD677KRZ-REEL pinout, AD677KRZ-REEL application, or AD677KRZ-REEL equivalent, key selection factors include its 1.0 LSB INL (typ), –99 dB THD, 1 MHz full-power bandwidth, dual-supply operation (+5 V logic / ±12 V analog), and SOIC-28 packaging with AGND sense for remote ground referencing.
Technical Context
The AD677KRZ-REEL implements a switched-capacitor charge-redistribution SAR architecture across two monolithic chips (analog BiMOS II + digital DSP CMOS), enabling 16-bit no-missing-codes performance without laser trimming. Its autocalibration uses an on-chip microcontroller and calibration DAC to measure and correct capacitor mismatch errors for top nine bits, storing correction values in RAM.
It operates with TTL-compatible digital I/O, separates analog (VCC/VEE/AGND) and digital (VDD/DGND) supplies to minimize crosstalk, and supports precise signal acquisition via AGND SENSE pin for remote ground sensing - critical for long-trace sensor interfaces where ground potential differs from ADC location.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees 65,536 distinct output codes with no missing codes over full scale. |
| Sampling Rate | 100 kSPS - enables real-time capture of signals up to 50 kHz Nyquist bandwidth with minimal aliasing risk. |
| INL (Max) | ±1.5 LSB - ensures end-point linearity error ≤ ±0.0023% of full scale (±10 V range), critical for calibration-grade measurements. |
| S/(N+D) | 92 dB (typ) - delivers effective resolution >15.0 ENOB at 100 kSPS, suitable for high-fidelity signal analysis. |
| THD | –99 dB (typ) - suppresses harmonic distortion to <0.001% of fundamental, essential for spectral purity in FFT-based applications. |
| Full-Power BW | 1 MHz - supports accurate digitization of fast transients or wideband sensor outputs without amplitude roll-off. |
| Input Range | ±VREF (5–10 V) - configurable bipolar input span matching standard industrial reference voltages. |
| Power Supplies | +5 V (VDD), ±12 V (VCC/VEE) - isolated analog/digital rails reduce switching noise coupling into conversion path. |
Pinout & Package
AD677KRZ-REEL is housed in a 28-lead plastic SOIC package (R-28 option), with 22 functional pins and 6 NC terminals. The package supports surface-mount assembly and provides thermal and mechanical stability for industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SAMPLE (Pin 1) | Digital Input | Controls acquisition window; rising edge initiates sampling, falling edge triggers conversion start after aperture delay. |
| CLK (Pin 2) | Digital Input | Master clock driving 17-cycle SAR algorithm; timing-critical for accuracy - min 480 ns period required. |
| SDATA (Pin 3) | Digital Output | Serial twos-complement data output (MSB first); synchronized to SCLK rising edge or CLK falling edge. |
| DGND (Pins 4,5) | Power | Digital ground reference for VDD and logic interface; must be isolated from AGND except at single-point star ground. |
| VCC (Pin 8) | Power | +12 V analog supply for internal DAC, comparator, and input buffer - requires local 0.1 µF decoupling. |
| AGND (Pin 12) | Power | Analog ground return for VREF, VIN, and internal analog circuitry - low-impedance path essential for dc accuracy. |
| AGND SENSE (Pin 15) | Analog Input | Remote analog ground sensing point - connects to source ground to cancel common-mode offset in long-cable sensor links. |
| VIN (Pin 16) | Analog Input | Differential-input-capable analog signal terminal; 50 pF input capacitance during sample phase affects external driver design. |
| VREF (Pin 17) | Analog Input | External reference voltage input (5–10 V); sets full-scale range and directly impacts gain accuracy and noise floor. |
| VEE (Pin 21) | Power | –12 V analog supply - powers negative rail circuits; matched regulation with VCC minimizes zero-error drift. |
| VDD (Pins 22,23) | Power | +5 V digital supply for controller, output buffers, and calibration logic - separate from analog rails to prevent digital noise injection. |
| SCLK (Pin 26) | Digital Output | Derived clock for SDATA readout; frequency matches CLK but phase-aligned for reliable serial data capture. |
| BUSY (Pin 27) | Digital Output | Active-HIGH status flag indicating ongoing conversion or calibration - used for handshaking with host processor. |
| 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; stores correction coefficients in RAM for continuous high-accuracy operation. |
| Integrated sample-hold | Removes requirement for external SHA; supports 2 µs input settling time and 100 ps aperture jitter for clean transient capture. |
| Separate analog/digital grounds | Reduces digital switching noise coupling into analog path - critical for achieving <1 LSB INL in mixed-signal PCB layouts. |
| AGND SENSE pin | Enables Kelvin connection to remote sensor ground, compensating for IR drop in cables and improving dc measurement accuracy. |
| TTL-compatible I/O | Allows direct interfacing with industry-standard microcontrollers and DSPs without level-shifting circuitry. |
| Twos-complement serial output | Provides signed-data format ideal for DSP math operations; MSB-first transmission simplifies FIFO buffering in real-time systems. |
Applications
| Test & Measurement Equipment | Industrial Process Control |
|---|---|
Use Scenario: High-accuracy voltage/current monitoring in automated calibration benches and portable multimeters. IC Role / Device Role / Timing Role: Primary 16-bit digitizer capturing sensor outputs with <±1.5 LSB INL and 92 dB dynamic range. Use Value: Enables traceable metrology-grade measurements without periodic manual recalibration due to on-chip autocalibration. | Use Scenario: Closed-loop feedback control of temperature, pressure, and flow in PLC-based manufacturing lines. IC Role / Device Role / Timing Role: Analog front-end ADC interfacing with 4–20 mA transmitters and RTD bridges via precision op-amp conditioning. Use Value: Maintains stable gain/offset over –40°C to +85°C industrial range using calibrated DAC corrections stored in on-chip RAM. |
| Medical Instrumentation | Communications Test Systems |
Use Scenario: Digitizing ECG, EEG, and patient vital signs in diagnostic equipment requiring low THD and high SNR. IC Role / Device Role / Timing Role: Bipolar-input ADC acquiring ±5 V bio-potential signals with 1 MHz full-power bandwidth for artifact rejection. Use Value: Delivers –99 dB THD and 92 dB S/(N+D) to preserve waveform fidelity during spectral analysis and arrhythmia detection. | Use Scenario: Baseband signal analysis in RF test receivers and vector signal analyzers capturing modulated IF waveforms. IC Role / Device Role / Timing Role: High-linearity ADC sampling at 100 kSPS with 16-bit resolution for IQ demodulation and constellation mapping. Use Value: Supports <–101 dB peak spurious and <–98 dB third-order IMD - enabling accurate EVM and ACLR measurements. |
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, integrated PGA and reference; higher power (120 mW), no autocalibration. | Multi-channel DAQ systems requiring channel-to-channel isolation and programmable gain. | Select AD7606C-16 when multi-input synchronization is needed; AD677KRZ-REEL remains optimal for single-channel ultra-low-distortion applications. |
| ADS8860 | 16-bit, 1 MSPS, SPI interface, internal reference; lower THD (–105 dB), no AGND sense or autocalibration. | High-speed portable instruments needing compact size and battery efficiency. | Choose ADS8860 for throughput >100 kSPS; AD677KRZ-REEL is preferred where dc accuracy, remote ground sensing, and self-calibration are mandatory. |
Compared with AD7606C-16 and ADS8860, the AD677KRZ-REEL uniquely combines autocalibration, AGND SENSE, and –99 dB THD in a single-channel architecture - making it irreplaceable for legacy or cost-sensitive precision measurement designs requiring guaranteed dc stability without external calibration infrastructure.
Availability
AD677KRZ-REEL is available at Aetrix Electronics and suitable for test & measurement equipment, industrial process control, and medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AD677KRZ-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 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 AD677KRZ-REEL belongs to Analog Devices' precision data converter product line, designed specifically for applications demanding uncompromised dc accuracy, low distortion, and robust operation in electrically noisy industrial environments.
FAQ
What is the operating temperature range for the AD677KRZ-REEL?
The AD677KRZ-REEL is rated for commercial temperature operation from 0°C to +70°C. It is not specified for extended industrial (–40°C to +85°C) operation - that grade is covered by AD677BD/AD677AD variants in ceramic DIP packages. Using AD677KRZ-REEL outside 0°C to +70°C may result in unguaranteed INL, THD, or S/(N+D) performance.
Does the AD677KRZ-REEL require an external voltage reference?
Yes, the AD677KRZ-REEL requires an external precision voltage reference applied to the VREF pin. It supports 5 V to 10 V inputs, and reference stability directly impacts gain accuracy and noise floor. Analog Devices recommends using the REF02 or ADR421 for optimal performance - the device contains no internal reference.
How does the AGND SENSE pin improve measurement accuracy in the AD677KRZ-REEL?
The AGND SENSE pin allows remote sensing of the analog ground potential at the signal source, compensating for voltage drop across PCB traces or cables. When connected to the source ground, it cancels common-mode offset errors - improving dc accuracy by up to ±2 LSB in long-distance sensor interfaces, as verified in AD677 application notes.
Can the AD677KRZ-REEL perform continuous conversions without gaps?
Yes, the AD677KRZ-REEL supports continuous conversion mode: SAMPLE can be asserted again as soon as BUSY goes LOW, even during the 17th CLK pulse. This achieves maximum throughput (100 kSPS) while ensuring full 2 µs input settling - provided tFCD (50 ns) and other timing constraints are strictly observed per the datasheet.
What is the purpose of the CAL pin on the AD677KRZ-REEL?
The CAL pin initiates asynchronous hardware reset and autocalibration: a HIGH pulse resets internal logic, then a LOW transition starts an 85,532-clock-cycle calibration sequence. BUSY goes HIGH during calibration and LOW upon completion. Calibration is recommended at power-up to ensure 16-bit accuracy; skipping it risks degradation to ~10-bit performance.
AD677KRZ-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:
- Active
- 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:
- -
AD677KRZ-REEL FAQ
1.How can I place an order for AD677KRZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD677KRZ-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 AD677KRZ-REEL reliable?
The price and inventory of AD677KRZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD677KRZ-REEL is usually 5 days.
3.What payment methods are accepted for AD677KRZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD677KRZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD677KRZ-REEL?
AD677KRZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD677KRZ-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 AD677KRZ-REEL?
For technical support, including AD677KRZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD677KRZ-REEL requirements.
6.How does Aetrix verify that AD677KRZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD677KRZ-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 AD677KRZ-REEL meets industry standards.
7.What is the process for return or replacement of AD677KRZ-REEL?
All AD677KRZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD677KRZ-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 AD677KRZ-REEL part is unused and in its original packaging.
Return procedure for AD677KRZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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