ICL7135CN 4.5-Digit Precision ADC | Texas Instruments
MPN: ICL7135CN ✗ انتهى عمره الإنتاجيICL7135CN نظرة عامة
What is a dual-slope ADC? A dual-slope ADC integrates an unknown input for a fixed interval and then measures the time required for a reference to return the integrator toward zero. This method is well suited to precision measurement because it rejects periodic noise, averages short disturbances, and can provide high effective resolution with relatively simple analog circuitry. ICL7135CN belongs to the analog-to-digital converter, data-converter, and signal-measurement semiconductor hierarchy.
Key features include 4.5-digit BCD-oriented measurement resolution, 2.0000 V full scale, multiplexed BCD output, true differential input, precision zero reading for a 0 V input, and precision null detection with true polarity at zero. The converter is intended for instrumentation applications where repeatable readings and direct display-driver compatibility matter more than high conversion throughput. Its dual-slope architecture favors noise rejection over sampling speed.
The ICL7135CN integrates a successive approximation and dual-slope conversion approach according to the verified product descriptions. The external reference and input arrangement must be selected to match the intended measurement range, while the display interface is organized for multiplexed BCD output. Because the supplied search results identify a 28-pin DIP package, the physical design should use the appropriate through-hole footprint and pin assignments shown in the manufacturer documentation.
Typical applications include digital panel meters, laboratory instruments, weighing systems, temperature measurement bridges, industrial process monitors, and precision test equipment. These systems benefit from the 4.5-digit readout, differential input capability, and ability to present decimal-aligned BCD results directly to display-driver circuitry. The relatively low conversion rate is suitable for continuously updated measurements rather than waveform acquisition or high-speed data logging.
Designers should pay particular attention to reference stability, input impedance, integrator components, timing accuracy, bypass capacitors, and display-drive timing. Use the manufacturer datasheet for the complete electrical limits and pinout, and verify the zero-input and null-detection behavior during calibration. This page combines verified distributor descriptions with engineering guidance while avoiding unverified electrical values that are not present in the supplied data.
بدائل مباشرة لـ ICL7135CN — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع ICL7135CN (نفس عامل الشكل والبصمة) — يختلف في Output Format, Package.
ICL7135CNG4
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ICL7135CPI
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ICL7135
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ICL7135C
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
TLC7135CDWR
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ICL7135CN الحدود القصوى والخصائص الكهربائية
| Product Type | 4.5-digit precision analog-to-digital converter |
| Conversion Architecture | Dual-slope |
| الدقة | 4.5 digits |
| Conversion Rate | 0.003 kSPS |
| Input Configuration | True differential input |
| Input Type | High-impedance differential input |
| Full-Scale Range | 2.0000 V |
| Accuracy | ±1 count in 20,000 |
| Output Format | Multiplexed BCD output |
| Display Interface | Display-driver output |
| Zero Input Reading | Zero reading for 0 V input |
| Null Detection | Precision null detection with true polarity at zero |
| العلبة | 28-pin DIP |
| Terminals | 28 terminals |
| نوع التركيب | Through-hole |
| Manufacturer | Texas Instruments |
| Operating Temperature Grade | Commercial |
دليل تكوين أطراف ICL7135CN 28-pin dip
تكوين الأطراف لـ ICL7135CN (حزمة 28-pin dip). يتميز هذا المكوّن التناظري بأطراف الإدخال والإخراج وإمداد الطاقة. راجع ورقة بيانات الشركة المصنعة لتكوينات طرف إلغاء الإزاحة والتعويض والتمكين. مثالي لدوائر تكييف الإشارة والمضخمات.
لا تتوفر بيانات مفصلة لمخطط التوصيلات لـ ICL7135CN.
راجع ورقة البيانات للحصول على تكوين الأطراف الكامل.
التطبيقات النموذجية
ICL7135CN مناسب لـ 6 التطبيقs: Digital Panel Meters, Precision Weighing Systems, Laboratory Temperature Measurement, Industrial Process Monitoring, Precision Test and Measurement, Slow-Variable Sensor Readout.
Digital Panel Meters
The ICL7135CN is well suited to digital panel meters because its verified 4.5-digit format and multiplexed BCD output are designed for measurement systems that update a readable decimal display. The 0.003 kSPS conversion rate is suitable for a continuously refreshed meter, while the dual-slope architecture supports averaging and rejection of periodic disturbances. A typical implementation places the converter between a conditioned sensor input and a display-driver interface, with the reference and integrator components selected from the manufacturer’s recommended circuit. The main benefit is display-oriented precision rather than fast acquisition.
موصى به
Precision Weighing Systems
The ICL7135CN can serve as the measurement ADC in a precision weighing system using a bridge-derived differential signal. Its true differential input is useful when the sensor output is small and referenced to a common midpoint, while the 2.0000 V full-scale capability provides a defined measurement range when the analog front end is scaled correctly. The 4.5-digit readout is appropriate for displaying mass, force, or calibrated engineering units. Designers should provide low-noise excitation and shielding, then verify zero and full-scale calibration against the complete datasheet limits.
موصى به
Laboratory Temperature Measurement
The ICL7135CN is appropriate for a laboratory temperature instrument that converts a stable bridge or sensor voltage into a readable 4.5-digit result. Its high-impedance differential input can reduce loading of the sensing network, and the dual-slope method is well matched to slowly changing temperature signals. The display output can show degrees, set points, or alarm thresholds without requiring a high-rate waveform capture path. For accurate results, keep the sensor wiring short, isolate it from switching converters, and verify reference stability during warm-up.
موصى به
Industrial Process Monitoring
The ICL7135CN can be used in industrial process monitoring when a slowly varying pressure, level, or flow signal requires a stable numeric indication. The 0.003 kSPS conversion rate is sufficient for supervisory displays and process readouts, while the true differential input supports ratiometric or bridge-based sensing. The long integration behavior helps reject recurring electrical interference when the layout is controlled. The converter should be paired with protected input conditioning, calibration storage, and a display or communications interface appropriate to the enclosure and grounding strategy.
موصى به
Precision Test and Measurement
The ICL7135CN is useful in a precision test instrument that measures a calibrated voltage and presents a decimal-aligned result. Its 4.5-digit format and ±1-count-in-20,000 accuracy are aligned with bench-top displays and calibration workflows. The differential input can reject common-mode variation when driven through suitable analog circuitry, and the slow conversion rate is not a limitation for a meter measuring settled values. Use a stable reference, low-leakage input paths, and a controlled ground plane to preserve the intended measurement performance.
موصى به
Slow-Variable Sensor Readout
The ICL7135CN fits a readout system for slow-changing sensor values such as level, pressure, or light level when the design objective is a stable displayed measurement rather than real-time waveform analysis. The dual-slope conversion process averages over a defined interval, while the multiplexed BCD output simplifies connection to digit-oriented display drivers. The design should minimize leakage around high-impedance inputs and keep the analog ground and reference routing away from switching nodes. Calibration sequence and display timing should follow the manufacturer’s recommended application circuit.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ ICL7135CN — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | ICL7135CNG4 | ICL7135CPI | ICL7135 | ICL7135C | TLC7135CDWR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Type | 4.5-digit precision ADC | ICL7135-family ADC | ICL7135-family ADC | High-precision 4.5-digit ADC | ICL7135C-family ADC | TLC7135-family ADC |
| Package | 28-pin DIP | 28-pin DIP | 28-pin DIP | 28-pin DIP | 28-pin DIP | 28-pin package designation requires verification |
أبرز الفروقات
- Supported same-package replacement path (مقابلICL7135CNG4)
- Precision display-oriented conversion (مقابلICL7135CPI)
- Dual-slope noise-oriented architecture (مقابلTLC7135CDWR)
ملاحظات التصميم
Do not select TLC7135CDWR as a drop-in replacement without checking the physical package. The supplied comparison identifies ICL7135CN as a 28-pin DIP and TLC7135CDWR as a different package designation. For a direct PCB substitution, start with ICL7135CNG4 or ICL7135CPI only after comparing the complete pinout, supply limits, timing, and temperature grade in the manufacturer documentation.
Protect the high-impedance differential input path from leakage, moisture, and nearby switching nodes. Route the sensor and reference connections away from display-driver and clock circuitry, use guarding where appropriate, and keep analog and digital return currents separated as far as the enclosure allows. The dual-slope architecture can reject periodic noise, but poor layout can still corrupt the integrated measurement.
Use the manufacturer’s recommended reference, integrator, bypass, and display-interface layout rather than improvising a generic ADC layout. Keep the analog components and input traces close to the converter, provide local decoupling, and maintain a stable reference path. Because the verified data identifies a 28-pin through-hole DIP, confirm the board spacing and pin numbering before fabrication.
The supplied data does not provide ICL7135CN supply voltage, current, or power-dissipation limits, so do not estimate them from the package or conversion rate. Consult the complete manufacturer datasheet, then size the supply and bypass network for the stated operating and absolute maximum ratings. Validate startup, zero-input behavior, and reference settling with the intended display-driver load.
The 0.003 kSPS conversion rate is appropriate for settled measurements, not rapid event capture. Confirm that the system can tolerate the visible update interval and that the display multiplexing scheme matches the converter output timing. Do not substitute a high-speed ADC without redesigning the input network, calibration procedure, processing, and display timing.
معلومات الامتثال
The supplied search data does not provide RoHS, REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 statements. The part is identified as commercial-grade by a distributor result, but commercial grade alone does not establish AEC-Q100 qualification.
