AD670JN - 8-Bit Signal Conditioning ADC | Analog Devices
MPN: AD670JN ✗ סוף ייצורAD670JN סקירה
An ADC is an analog-to-digital converter, a semiconductor in the data-converter category that translates a continuous voltage into a digital code. The AD670JN belongs to the successive-approximation-register ADC family and combines that conversion mechanism with analog signal conditioning and a parallel microprocessor interface. A SAR ADC determines its result by successively comparing the input against an internally generated DAC level. The AD670 extends this basic conversion function with an instrumentation-amplifier front end, internal precision reference, comparator, and tri-state output buffer. This integration places the device in the hierarchy of ADC, data-converter IC, signal-conditioning converter, and general-purpose semiconductor. The integrated front end is especially relevant where a sensor produces a small differential signal riding on a larger common-mode voltage, because external amplification and offset conditioning would otherwise increase component count, board area, and calibration complexity.
The primary features identified in the verified manufacturer materials include complete 8-bit signal conditioning, a differential-input instrumentation-amplifier front end, a precision internal voltage reference, a microprocessor bus interface, and a conversion speed of 10 microseconds. The differential front end supports direct connection of suitable sensor outputs and rejects common-mode voltage to the extent permitted by the device's operating limits. The internal DAC, comparator, and SAR form the conversion core, while the three-state output buffer permits controlled connection to shared data buses. Because the converter includes the major analog blocks, it can reduce external passive-component and trimming requirements. Its 8-bit resolution divides the supported measurement span into 256 codes, making it appropriate for position, level, threshold, and proportional feedback systems where one least-significant bit is adequate.
The AD670JN uses a successive-approximation conversion architecture rather than a flash, pipeline, or sigma-delta architecture. SAR conversion is well suited to this device's stated 10-microsecond speed because it combines moderate throughput with an integrated monolithic implementation. The instrumentation-amplifier front end converts the conditioned input into a form that the comparator can evaluate against the internal DAC. During conversion, the successive-approximation logic successively updates the DAC, compares its voltage with the conditioned input, and records each comparison as one bit of the 8-bit result. The internal precision reference establishes the comparison scale. A microprocessor can read the converted byte through the parallel bus when the converter indicates completion. Tri-state outputs reduce bus contention when multiple converter outputs share a bus, provided the interface is sequenced correctly.
Typical uses include industrial process measurement, laboratory instrumentation, transducer signal acquisition, closed-loop position control, and legacy embedded control equipment. The integrated front end is useful when the source is differential and its amplitude is within the AD670's input and common-mode limits. The 10-microsecond conversion rate permits sampling of relatively slow variables such as temperature, pressure, position, and analog control feedback. Because the converter resolution is only 8 bits, it should not be selected for applications requiring precise waveform reconstruction, high dynamic range, or fine quantization. The PDIP-20 package also favors through-hole legacy equipment and industrial control cards rather than compact wearable or high-density embedded systems. The obsolete lifecycle status makes continuity of supply a central selection consideration.
The primary design concern is analog input conditioning. Engineers should verify the supported bipolar or unipolar input range, input impedance, common-mode range, differential input limits, and required source impedance against the manufacturer datasheet before applying external sensors. Grounding and decoupling must preserve reference stability and minimize conversion error. The microprocessor interface timing and output enable behavior must also be observed because the tri-state bus is intended for controlled system-level access. Since exact pin assignments, supply limits, and timing values were not supplied in the verified web data, they must not be inferred from generic AD670-family descriptions. New designs should also account for obsolescence, counterfeit screening, and a possible PCB redesign if a currently supported converter offers better resolution, packaging, or lifecycle assurance.
This page consolidates the verified distributor and manufacturer information for the AD670JN, including its obsolete status, 8-bit SAR architecture, 10-microsecond conversion speed, 20-pin PDIP package, pricing indication, and engineering-oriented replacement considerations. It also distinguishes verified facts from data requiring confirmation from the full manufacturer datasheet. That distinction is important for an obsolete converter, where package variants, temperature grades, screening levels, and supply conditions can materially affect drop-in qualification.
חלופות תחליף ישיר עבור AD670JN — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם AD670JN (אותו גורם צורה וטביעת רגל) — שונים ב External Trim Requirement, Integrated Conversion Elements, Mounting Type, Operating Temperature, Package.
AD670SD
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
AD670SD/883B
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
AD670JN דירוגים מרביים ומאפיינים חשמליים
| רזולוציה | 8 bit |
| Conversion Architecture | Successive approximation register (SAR) |
| Conversion Speed | 10 us |
| Number of Inputs | 2 |
| Input Type | Differential input |
| Integrated Front End | Instrumentation amplifier |
| Integrated Conversion Elements | DAC, comparator, SAR, precision voltage reference, and tri-state output buffer |
| ממשק | Parallel microprocessor bus interface |
| Output Resolution Levels | 256 codes |
| External Trim Requirement | No user trims required |
| External Interface Components | No external components required to interface |
| מארז | 20-pin PDIP |
| סוג הרכבה | Through-hole |
| טמפרטורת פעולה | 0C to 70C |
| סטטוס מחזור חיים | Obsolete |
| Indicative Price | $61.00 as of 2026-10-30 |
מדריך תצורת פינים של AD670JN 20-pin pdip
תצורת פינים עבור AD670JN (מארזת 20-pin pdip). רכיב אנלוגי זה כולל פיני כניסה, יציאה ואספקת מתח. יש לעיין בגיליון הנתונים של היצרן לתצורות פיני איפוס היסט, פיצוי והפעלה. אידיאלי למעגלי עיצוב אותות ומגברים.
אין נתוני פריסת פינים מפורטים עבור AD670JN.
עיינו ב- גיליון נתונים עבור תצורת פינים מלאה.
יישומים טיפוסיים
AD670JN מתאים עבור 6 יישוםs: Industrial Process Measurement, Transducer Signal Acquisition, Legacy Position Control, Laboratory Instrumentation, Microprocessor Bus Interface, Electronic Thermometer and Level Display.
Industrial Process Measurement
The AD670JN fits legacy industrial process-measurement circuits that acquire slowly changing analog variables such as pressure, level, or flow. Its integrated instrumentation-amplifier front end accepts a differential input, while the internal precision reference, DAC, comparator, and SAR reduce the external analog circuitry needed around a sensor. The 10-microsecond conversion speed is generally more than adequate for supervisory control loops that update at human or process-cycle rates. The 8-bit result provides 256 quantization levels, which can support thresholding, proportional indication, and basic feedback but not precision process analytics. Because the verified operating-temperature indication is 0C to 70C, deployment in a wider industrial enclosure requires an ambient-control plan or component requalification. Obsolete-part availability should also be considered before extending the design life of the installation.
מומלץ
Transducer Signal Acquisition
The AD670JN is appropriate for differential transducer measurement where a small sensor signal must be converted into a digital value without a separate instrumentation amplifier. Its integrated instrumentation front end, precision internal reference, and SAR conversion core are intended to provide a compact signal-conditioning path. The 10-microsecond conversion time allows the circuit to sample many slow mechanical or environmental variables, such as displacement, strain, or temperature-derived voltages. With 8-bit resolution, the converter represents the usable input span in 256 steps, so the engineer must set gain and signal range so that one code corresponds to the required measurement resolution. Source impedance, common-mode limits, and input range must be verified from the manufacturer datasheet. In obsolete equipment, retaining the AD670JN can preserve the existing sensor and board architecture without redesigning the analog front end.
מומלץ
Legacy Position Control
The AD670JN can serve as the feedback digitizer in a legacy position-control system that uses an analog position sensor and an 8-bit microprocessor controller. The differential instrumentation front end can reduce the need for separate input amplification when the sensor output meets the converter's electrical limits. Its 10-microsecond conversion speed is well matched to electromechanical position loops that change over milliseconds rather than microseconds. The resulting 8-bit command resolution can be adequate for coarse travel, indexing, or limit detection, but it will limit final positioning accuracy and may require averaging or a higher-resolution controller for precision motion. Because the converter is obsolete and rated in the verified data only from 0C to 70C, service spares should be stored under controlled conditions and qualified for any extended industrial environment.
מומלץ
Laboratory Instrumentation
AD670JN can be retained in laboratory instrumentation that requires a simple, self-contained analog measurement channel rather than a high-resolution data-acquisition converter. The internal instrumentation amplifier, precision voltage reference, and tri-state output buffer reduce external support parts, while the parallel microprocessor bus permits direct connection to an embedded controller. The 10-microsecond conversion speed supports slow laboratory variables such as temperature, light level, pressure, and operator controls. An 8-bit ADC is most useful when the measured quantity requires display, alarm, or coarse closed-loop resolution rather than calibrated scientific analysis. For new instruments, engineers should compare the obsolete AD670JN against supported converters with wider temperature grades, better resolution, and available documentation. For repair of an existing instrument, exact package and pin verification remains essential before fitting AD670SD or AD670SD/883B.
מומלץ
Microprocessor Bus Interface
The AD670JN is suited to legacy embedded systems that acquire one or two analog channels and present the result through a parallel microprocessor bus. Its three-state output buffer supports shared-bus architectures when software sequences the output-enable function correctly, and the integrated reference removes the need for a separate reference component in a basic measurement channel. The 8-bit word width and 10-microsecond conversion time align with an 8-bit controller performing supervisory measurement or threshold control. Engineers should implement handshaking around conversion completion and avoid bus contention when another peripheral shares the data lines. The device's 20-pin PDIP footprint is advantageous when maintaining older through-hole control boards. However, its obsolete status and 0C to 70C operating-temperature indication make it unsuitable by default for new extended-temperature embedded products without qualification and a deliberate long-term sourcing plan.
מומלץ
Electronic Thermometer and Level Display
The AD670JN can digitize a scaled temperature or tank-level signal for a basic display, alarm, or relay-control system. Its instrumentation front end and internal precision reference support a compact analog channel, while the 8-bit result is generally adequate for coarse level indications and simple threshold switching. The 10-microsecond conversion speed is more than adequate because thermal and liquid-level signals usually change slowly. For practical accuracy, the engineer must account for sensor nonlinearity, analog gain, offset, and the fact that 256 codes divide only the selected input span; resolution beyond one code requires averaging, calibration, or a better converter. The component's through-hole PDIP-20 package helps serviceability, but its obsolete lifecycle and commercial temperature rating limit its suitability for safety-critical or harsh-environment installations.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור AD670JN — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | AD670SD | AD670SD/883B |
|---|---|---|---|
| Package | 20-pin PDIP | 20-pin PDIP | 20-pin PDIP |
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 8 bit | 8 bit | 8 bit |
| Conversion Architecture | SAR | SAR | SAR |
| Signal-Conditioning Front End | Instrumentation amplifier with differential input | AD670-family signal-conditioning front end | AD670-family signal-conditioning front end |
| Qualification Designation | No 883B designation shown | No 883B designation shown | 883B ordering designation |
מבדילים עיקריים
- Complete integrated signal-conditioning ADC (לעומתAD670SD)
- Legacy-compatible 20-pin PDIP footprint (לעומתAD670SD/883B)
- 10-microsecond conversion capability (לעומתAD670SD/883B)
הערות תכנון
Do not assume that a family-level or package-level cross-reference proves a safe drop-in replacement. Compare the official pin table, supply voltage, analog input range, common-mode limits, differential input range, reference behavior, acquisition timing, output timing, and temperature grade for AD670JN, AD670SD, and AD670SD/883B. The supplied web snippets establish family and package relationships but do not provide a complete pin-to-pin comparison, so physical substitution requires datasheet-level qualification.
Preserve the original board's analog and digital partitioning when repairing a system with AD670JN. Keep the input path away from the parallel microprocessor bus, provide a low-impedance ground reference, and use the same grounding topology recommended by the manufacturer datasheet. Since the ADC includes an internal reference and instrumentation front end, board-level bypass and grounding still influence noise and conversion repeatability. Record every component change so a later calibration or replacement decision remains traceable.
Verify the exact supply-voltage tolerance and sequencing requirements from the official datasheet before energizing replacement boards; these values were not present in the verified web data and therefore are not specified here. Inspect electrolytic capacitors and inspect for leakage or dried-out filtering because an obsolete board may have been stored for many years. Prefer a controlled power-up sequence and avoid hot-swapping a through-hole converter unless its pins and the surrounding circuit have been qualified for that procedure.
מידע על תאימות
The verified web results did not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable because the AD670JN is an industrial/legacy analog-to-digital converter rather than an automotive-qualified device in the supplied data.