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Analog Devices Inc. AD677AD
- Part No.:
- AD677AD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD677AD.pdf
- Description:
- IC ADC 16BIT SAR 16CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,399
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Product details
Overview
AD677AD from Analog Devices is a 16-bit, 100 kSPS autocalibrating successive-approximation ADC with on-chip sample-hold, serial output, ±1 LSB INL (typ), –99 dB THD, and 1 MHz full-power bandwidth. It operates from ±12 V analog and +5 V digital supplies, targets precision measurement and signal processing systems requiring stable dc accuracy and dynamic performance.
For engineers reviewing the AD677AD datasheet, AD677AD pinout, AD677AD application, or AD677AD equivalent, key selection criteria include its industrial temperature range (–40°C to +85°C), ceramic DIP-16 package, bipolar ±VREF input support, autocalibration architecture, and compatibility with standard DSP serial interfaces.
Technical Context
The AD677AD implements a switched-capacitor charge-redistribution SAR architecture segmented across two monolithic chips-an analog BiMOS II ADC chip and a digital CMOS controller chip-co-packaged in a single ceramic DIP. Its autocalibration uses an on-chip microcontroller and calibration DAC to measure and store capacitor mismatch corrections in RAM for real-time error compensation.
Conversion is initiated by a rising edge on SAMPLE, followed by 17 CLK pulses; output is twos-complement serial data synchronized to SCLK. The device features separate analog/digital grounds, AGND sense for remote ground referencing, and TTL-compatible logic I/O with independent VDD supply to minimize digital crosstalk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits - guarantees no missing codes over full scale |
| Sampling Rate | 100 kSPS - 10 µs total conversion time, supports real-time signal capture |
| INL (DC Accuracy) | ±1 LSB (typ) - enables high-precision dc measurements without external trimming |
| THD | –99 dB - low harmonic distortion critical for audio and instrumentation signal fidelity |
| S/(N+D) | 92 dB - high dynamic range for resolving small signals amid noise |
| Full-Power Bandwidth | 1 MHz - supports accurate digitization of fast-rising analog waveforms |
| Input Range | ±VREF (5 V to 10 V) - flexible bipolar operation compatible with standard reference sources |
| Supply Voltages | +12 V / –12 V (analog), +5 V (digital) - isolated power domains reduce coupling-induced errors |
Pinout & Package
AD677AD is housed in a 16-pin narrow ceramic dual-in-line package (DIP), rated for industrial temperature operation (–40°C to +85°C). Pin numbering follows standard DIP orientation with Pin 1 at top-left corner.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SAMPLE | Digital input controlling acquisition start; falling edge initiates conversion sequence |
| 2 | CLK | Master clock input; 17 pulses required per 16-bit conversion |
| 3 | SDATA | Serial output carrying twos-complement result MSB-first |
| 4 | DGND | Digital ground reference for logic I/O and VDD domain |
| 5 | VCC | +12 V analog supply for internal DAC, comparator, and buffers |
| 8 | AGND | Analog ground reference for VIN, VREF, and internal analog circuitry |
| 9 | AGND SENSE | Remote analog ground sensing point to compensate for ground potential differences |
| 10 | VIN | Bipolar analog input (±VREF range); connected to internal sample-hold amplifier |
| 11 | VREF | External voltage reference input (5 V to 10 V); sets full-scale range |
| 12 | VEE | –12 V analog supply; powers negative rail circuits including comparator |
| 13 | VDD | +5 V digital supply for controller, RAM, and output drivers |
| 14 | SCLK | Derived serial clock output; synchronizes SDATA read timing |
| 15 | BUSY | Active-high status indicator signaling active conversion or calibration |
| 16 | CAL | Asynchronous hardware reset and calibration trigger; initiates 85,532-clock-cycle routine |
Key Features
| Feature | Design Value |
|---|---|
| On-chip autocalibration | Eliminates need for user trim pots or external calibration circuitry; stores correction values in on-chip RAM |
| Integrated sample-hold | Capacitor-array-based acquisition eliminates external SHA components and reduces board space |
| Separate analog/digital supplies | VCC/VEE (+12 V/–12 V) and VDD (+5 V) isolation minimizes digital switching noise coupling into analog path |
| AGND sense capability | Compensates for ground potential difference between signal source and ADC, improving accuracy in distributed systems |
| TTL-compatible I/O | Ensures direct interfacing with industry-standard logic families without level-shifting circuitry |
| Twos-complement serial output | Standard format simplifies integration with ADI DSPs and microcontrollers supporting serial peripheral interfaces |
Applications
| High-Accuracy Data Acquisition | Industrial Process Monitoring |
|---|---|
Use Scenario: Digitizing sensor outputs (e.g., strain gauges, RTDs) in laboratory-grade instruments where absolute dc accuracy and long-term stability are critical. IC Role / Device Role / Timing Role: Primary 16-bit ADC performing bipolar sampling with autocalibration to maintain ±1 LSB INL over temperature. Use Value: Eliminates periodic manual recalibration and external trim components, reducing maintenance cost and system drift over –40°C to +85°C. | Use Scenario: Continuous monitoring of pressure, flow, and temperature in factory automation PLC modules operating in harsh thermal environments. IC Role / Device Role / Timing Role: High-reliability ADC handling 100 kSPS burst sampling of analog field transmitters with remote ground referencing via AGND SENSE. Use Value: Ceramic DIP-16 package and industrial temp grade ensure mechanical robustness and parametric stability under vibration and thermal cycling. |
| Audio Signal Analysis | Test & Measurement Equipment |
Use Scenario: Capturing wide-dynamic-range audio waveforms in spectrum analyzers and acoustic test benches requiring >90 dB SFDR. IC Role / Device Role / Timing Role: Precision ADC delivering –99 dB THD and 92 dB S/(N+D) at 100 kSPS for baseband audio digitization. Use Value: Full-power bandwidth of 1 MHz supports accurate reconstruction of harmonics up to 500 kHz, essential for distortion analysis. | Use Scenario: Embedded digitizer in portable oscilloscopes and multimeters needing calibrated, repeatable measurements across multiple ranges. IC Role / Device Role / Timing Role: Autocalibrating ADC providing traceable accuracy without factory recalibration cycles; supports ±VREF scaling for multi-range front ends. Use Value: On-chip calibration DAC and RAM storage enable one-time power-up calibration, reducing production test time and BOM count. |
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 analog front end, SPI interface, ±10 V input, no internal reference | Multi-channel data loggers requiring phase-coherent sampling across sensors | Select AD7606C-16 when channel density and simultaneous capture outweigh single-channel speed and autocalibration simplicity |
| ADS8860 | 16-bit, 1 MSPS, pseudo-differential input, SPI interface, internal reference, lower power (15 mW) | Battery-powered portable instruments needing higher throughput and lower supply current | Select ADS8860 when sampling rate >100 kSPS and power budget <50 mW are mandatory; AD677AD preferred for dc-critical industrial use |
Compared with AD7606C-16 and ADS8860, the AD677AD offers superior dc accuracy (±1 LSB INL typ) and built-in autocalibration for long-term stability, but lacks multi-channel capability and modern low-power design-making it optimal for legacy-replacement and high-stability single-channel measurement systems.
Availability
AD677AD is available at Aetrix Electronics and suitable for industrial process monitoring, high-accuracy data acquisition, and test & measurement equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AD677AD 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 AD677AD belongs to Analog Devices' legacy high-precision SAR ADC product line, designed specifically for industrial and instrumentation applications demanding uncompromised dc accuracy, autocalibration, and robust operation over –40°C to +85°C.
FAQ
What is the operating temperature range of the AD677AD?
The AD677AD is specified for industrial operation from –40°C to +85°C. This rating is confirmed in the Ordering Guide and DC Specifications tables, where AD677AD is explicitly listed under the A, B Grades column with TMIN = –40°C and TMAX = +85°C. Its ceramic DIP-16 package supports reliable thermal performance across this full range without derating.
Does the AD677AD require external calibration components?
No, the AD677AD does not require external calibration components. Its on-chip autocalibration circuitry-including a microcontroller, calibration DAC, and RAM-measures and corrects capacitor mismatch errors internally. As stated in the Product Highlights and Functional Description, this eliminates user adjustments and external trim components, and the AD677AD achieves ±1 LSB INL (typ) post-calibration without external support.
What package type is used for the AD677AD?
The AD677AD uses a 16-pin narrow ceramic dual-in-line package (DIP), designated as "D-16" in the Ordering Guide. This is distinct from plastic DIP (N-16) and SOIC (R-28) variants. The ceramic construction provides superior thermal stability and hermeticity, supporting the device's industrial temperature rating and long-term parameter consistency.
How does the AD677AD handle ground referencing for remote analog sources?
The AD677AD provides dedicated AGND SENSE (Pin 9) to remotely sense the ground potential of the analog signal source. As described in the Pin Description and Applications section, this feature compensates for voltage drops between the source ground and the ADC's local AGND, improving measurement accuracy when VIN is routed over distance-especially critical in distributed industrial sensor networks.
What is the minimum recommended reference voltage for the AD677AD?
The AD677AD supports a VREF input range of 5 V to 10 V, as specified in the DC Specifications table under "VOLTAGE REFERENCE INPUT RANGE." The minimum recommended value is 5 V; operation below this violates the Absolute Maximum Ratings and compromises linearity, noise, and full-scale accuracy. Reference stability and low-noise design are emphasized in the Applications section for optimal performance.
AD677AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD677AD FAQ
1.How can I place an order for AD677AD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD677AD 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 AD677AD reliable?
The price and inventory of AD677AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD677AD is usually 5 days.
3.What payment methods are accepted for AD677AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD677AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD677AD?
AD677AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD677AD 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 AD677AD?
For technical support, including AD677AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD677AD requirements.
6.How does Aetrix verify that AD677AD is sourced from the original manufacturer or authorized distributors?
All AD677AD 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 AD677AD meets industry standards.
7.What is the process for return or replacement of AD677AD?
All AD677AD units undergo pre-shipment inspection (PSI). If there is an issue with AD677AD, 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 AD677AD part is unused and in its original packaging.
Return procedure for AD677AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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