AD673JD - 8-Bit SAR ADC, 30 us | Analog Devices
MPN: AD673JD ✓ פעילAD673JD סקירה
An ADC is a data-conversion component that transforms an analog voltage into a digital number for processing, measurement, or control. Successive-approximation, or SAR, ADCs repeatedly compare the input against an internal DAC until their difference falls within the converter's resolution. The AD673JD belongs to the ADC and DAC category within integrated circuits and offers a simple parallel data interface for microprocessor-based measurement systems.
The converter's principal features include complete 8-bit conversion, no missing output codes over temperature, and support for either full or 16-bit microprocessor bus interfacing. Its integrated reference, clock, comparator, DAC, and register reduce the number of external components required in a measurement circuit. Three-state output buffers permit the data bus to be placed into a high-impedance state when multiple devices share common bus lines.
The AD673 uses a successive-approximation conversion architecture in which an internal DAC generates trial voltages during each conversion cycle. A comparator evaluates the trial voltage against the analog input, and the successive-approximation register records the binary decision sequence. The resulting eight digital outputs represent the converted input, while the conversion-status output can support processor-controlled acquisition timing.
Typical uses include industrial process measurement, instrumentation, data acquisition, embedded control, and legacy microprocessor interfaces. The device is particularly useful where an 8-bit measurement resolution is sufficient but a complete converter with an internal reference is preferred over a discrete resistor ladder and external comparator.
The principal design consideration is the negative supply requirement. Layout should keep analog input and reference paths away from digital switching traces, while decoupling should follow the connection and grounding recommendations in the manufacturer datasheet. Because the AD673JD operates with +5 V and -15 V supplies, system designers should verify negative-rail generation and signal-reference compatibility before layout release.
This product page organizes the AD673JD specifications, functional characteristics, application guidance, and same-footprint upgrade choices for faster engineering evaluation. It also identifies where the complete pin assignment and detailed electrical limits must be confirmed in the manufacturer datasheet before a new PCB is manufactured.
חלופות תחליף ישיר עבור AD673JD — 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 AD673JD (אותו גורם צורה וטביעת רגל) — שונים ב Package.
AD673SD/883B
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
AD673JNZ
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
AD673SD
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
AD673BN
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
AD673JN
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←AD673JD דירוגים מרביים ומאפיינים חשמליים
| רזולוציה | 8 bit |
| Converter Architecture | Successive approximation (SAR) |
| Maximum Conversion Time | 30 us |
| Integrated Functions | DAC, voltage reference, clock, comparator, SAR, and three-state output buffers |
| Input Polarity | Unipolar and bipolar |
| Supply Configuration | +5 V and -15 V |
| ממשק | Full or 16-bit microprocessor bus interface |
| Output Missing Codes | No missing codes over temperature |
| מארז | 20-pin ceramic dual in-line package |
| סוג הרכבה | Through-hole |
| MIL-STD-883 Version | Available per manufacturer datasheet note |
| Digital Output Type | Three-state parallel outputs |
מדריך תצורת פינים של AD673JD 20-pin ceramic dual in-line package
תצורת פינים עבור AD673JD (מארזת 20-pin ceramic dual in-line package). 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 AD673JD.
עיינו ב- גיליון נתונים עבור תצורת פינים מלאה.
יישומים טיפוסיים
AD673JD מתאים עבור 6 יישוםs: Industrial Process Measurement, Microprocessor Data Acquisition, Instrumentation and Test Equipment, Embedded Control Feedback, Legacy Equipment Maintenance, Battery-Powered Monitoring.
Industrial Process Measurement
The AD673JD fits industrial process measurement when 8-bit resolution and a 30 us maximum conversion time are sufficient for monitoring pressure, temperature, level, or position. Its complete SAR architecture combines a DAC, voltage reference, clock, comparator, and register on one chip, reducing the external circuitry needed around a microprocessor input port. The converter supports unipolar and bipolar inputs, which accommodates many sensor-output arrangements after appropriate conditioning. In an industrial design, the +5 V and -15 V supplies, input protection, grounding, and operating-temperature requirements must be handled carefully to prevent external noise or transients from reducing measurement quality.
מומלץ
Microprocessor Data Acquisition
The AD673JD is appropriate for legacy microprocessor data-acquisition systems that can use parallel digital outputs and a conversion-status signal. Its eight output bits can be connected to a bus interface, while the three-state buffers allow shared-bus operation when multiple converters or peripherals require bus release. The 30 us maximum conversion time is suitable for supervisory sampling rather than high-speed waveform capture. Because the device accepts full or 16-bit microprocessor bus interfacing according to the manufacturer datasheet, board design should account for unused bus positions, address decoding, timing, and the relationship between conversion status and data acquisition.
מומלץ
Instrumentation and Test Equipment
The AD673JD can serve as the measurement front end in instrumentation where an 8-bit reading is adequate but repeatable acquisition and simple bus integration are priorities. The integrated reference and clock reduce component count and help establish a compact measurement channel, while the 30 us maximum conversion time supports moderate sampling rates. For instrumentation, the analog input should be conditioned so its voltage stays within the selected range and does not introduce excessive source impedance or noise. Good layout should separate sensitive input routing from digital bus transitions, and the negative supply must be generated cleanly if the measurement circuit is not inherently bipolar.
מומלץ
Embedded Control Feedback
The AD673JD is suitable for embedded control loops that monitor a slowly varying analog process variable and update actuator commands through a processor. Eight-bit resolution provides 256 distinguishable levels across the configured range, which is appropriate for many supervisory or coarse closed-loop functions. The 30 us conversion time is substantially faster than most mechanical control processes, allowing the processor to refresh the measurement at a useful rate. The design should confirm whether quantization resolution is acceptable, apply input filtering for noise reduction, and include startup and settling behavior in the control-loop timing analysis.
מומלץ
Legacy Equipment Maintenance
The AD673JD is particularly relevant to maintenance and repair of older analog-instrumentation systems that use an 8-bit SAR converter with a 20-pin DIP footprint. Keeping the established architecture can avoid a full board redesign when the original converter is being replaced with a documented same-family ordering option. The engineer should compare the exact suffix, temperature grade, screening, and lead finish against the removed component rather than relying on package shape alone. Stable analog layout, decoupling, input conditioning, and the original negative-supply arrangement should be preserved or deliberately revalidated during the replacement process.
מומלץ
Battery-Powered Monitoring
The AD673JD can be used in battery-powered monitoring equipment when its measurement rate and supply arrangement fit the power budget. Eight-bit resolution is adequate for coarse battery, environmental, or equipment-state monitoring, and the integrated converter functions minimize the number of separate active components. The 30 us conversion specification means acquisition itself is not normally the dominant energy cost; standby behavior, negative-rail efficiency, leakage, and processor activity may have a greater effect on battery life. Use shutdown or duty-cycling methods where possible, but verify their electrical timing and system-level behavior against the manufacturer application guidance.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור AD673JD — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | AD673SD/883B | AD673JNZ | AD673SD | AD673BN |
|---|---|---|---|---|---|
| Package | 20-pin ceramic DIP | 20-pin ceramic DIP - same | 20-pin ceramic DIP - same | 20-pin ceramic DIP - same | 20-pin ceramic DIP - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Converter Architecture | Successive approximation (SAR) | Successive approximation (SAR) | Successive approximation (SAR) | Successive approximation (SAR) | Successive approximation (SAR) |
| Maximum Conversion Time | 30 us | 30 us | 30 us | 30 us | 30 us |
| Input Polarity | Unipolar and bipolar | Unipolar and bipolar | Unipolar and bipolar | Unipolar and bipolar | Unipolar and bipolar |
| Supply Arrangement | +5 V and -15 V | +5 V and -15 V | +5 V and -15 V | +5 V and -15 V | +5 V and -15 V |
| Digital Output Interface | Three-state parallel outputs with full or 16-bit microprocessor bus support | Three-state parallel outputs with full or 16-bit microprocessor bus support | Three-state parallel outputs with full or 16-bit microprocessor bus support | Three-state parallel outputs with full or 16-bit microprocessor bus support | Three-state parallel outputs with full or 16-bit microprocessor bus support |
מבדילים עיקריים
- Complete converter integration (לעומתAD673SD)
- Documented screened family option (לעומתAD673SD/883B)
- Direct 20-pin DIP family continuity (לעומתAD673JNZ)
הערות תכנון
Design the power tree around the specified +5 V and -15 V operating arrangement, including the manufacturer footnote for +5 V with -12 V or -15 V operation. Place the required bypass capacitors close to their associated supply pins and keep the negative return path free of large switching currents. Check startup sequencing, rail ripple, and analog signal limits across temperature before releasing the PCB layout.
Route the analog input directly toward the converter and keep it away from clock, digital-output, and bus-switching traces. Use a compact ground strategy that provides a low-impedance return for the converter, reference, and input-conditioning network. If the sensor or divider is physically remote, place any input buffer close enough to prevent added noise and phase error from degrading the acquired signal.
Do not treat the 20-pin DIP outline as sufficient proof that every AD673 suffix is interchangeable. Confirm the ordering information, temperature grade, screening option, and electrical limits for the selected device. Also verify that the system can generate the negative supply and that the chosen input-conditioning network does not exceed the converter's allowable analog input range.
Account for conversion status, output settling, bus timing, and the processor's sampling instant as a complete acquisition sequence. The three-state outputs can support shared buses, but control of read and bus-enable signals must avoid contention. If the measured source has significant impedance, calculate its settling behavior within the 30 us maximum conversion interval and add filtering where the sensor's noise would otherwise affect the 8-bit result.
מידע על תאימות
The Analog Devices datasheet notes that an AD673 version is available compliant with MIL-STD-883. RoHS, REACH, lead-free, halogen-free, and conflict-minerals declarations were not identified.
