ICL7135CAI+ - 4.5-Digit Dual-Slope ADC | Analog Devices
Артикул: ICL7135CAI+ ✓ АктивенICL7135CAI+ Обзор
A dual-slope ADC is an integrating analog-to-digital converter that measures input voltage by comparing a controlled integration period with a reference-driven de-integration period. This technique belongs to the wider ADC, data-converter, and semiconductor hierarchies. It is especially useful when low-frequency measurements require good noise rejection and predictable behavior with slow-changing sensor signals.
The ICL7135CAI+ provides a 4.5-digit measurement range, a 2.0000 V full-scale capability, and ±1 count in 20,000 accuracy. Its high-impedance differential input structure supports source impedances that would otherwise degrade simple resistive divider measurements. Multiplexed BCD outputs reduce the number of connections required when driving a seven-segment display, while the 28-SSOP format supports compact panel-meter and laboratory-instrument layouts.
The manufacturer describes the ICL7135 as a monolithic converter designed around a dual-slope conversion architecture. Differential input handling is central to its measurement behavior because it permits a sensor signal to be measured relative to a return or reference node. The 4.5-digit result format supports a maximum reading of 19,999 counts, while the stated ±1-count-in-20,000 accuracy establishes the conversion-error target for the product family.
Typical uses include digital panel meters, temperature measurement instruments, laboratory readouts, process monitoring, portable meters, and industrial measurement equipment. The device is particularly appropriate when a regulated reference, controlled input excitation, and a dedicated display interface are available. It is less suitable for high-speed waveform acquisition, communications, or applications requiring many conversions per second.
For implementation, follow the manufacturer pin-description and application tables when assigning the reference, integrator, input, clock, and display signals. Stable reference and input components are central to repeatable dual-slope measurements, while correct grounding and protection are necessary when external sensors connect to the measurement terminals.
This product record combines the official ICL7135 product information with distributor package, ordering, and availability details. It also distinguishes the closely related ICL7135CAI- temperature-grade variant from the ICL7135CMH-D, which uses a different 44-pin package, so engineers can assess replacement options without treating package-incompatible parts as drop-in substitutes.
Аналоги без доработки для ICL7135CAI+ — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
ICL7135CAI-
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ICL7135CAI+ Максимальные параметры и электрические характеристики
| Converter Type | Dual-slope A/D converter |
| Разрешение | 4.5 digits, 0.5-count increment |
| Maximum Reading | 19,999 counts |
| Conversion Accuracy | ±1 count in 20,000 |
| Full-Scale Voltage | 2.0000 V |
| Input Configuration | High-impedance differential input |
| Output Format | Multiplexed BCD |
| Display Compatibility | 7-segment display driver |
| Корпус | 28-SSOP, 5.30 mm width |
| Тип монтажа | Surface mount |
| Статус RoHS | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | unknown |
Руководство по цоколевке ICL7135CAI+ в корпусе 28-ssop, 5.30 mm width
Цоколевка для ICL7135CAI+ (корпус 28-ssop, 5.30 mm width). Этот аналоговый компонент имеет выводы входа, выхода и питания. Обратитесь к техническому описанию производителя для конфигураций выводов балансировки нуля, коррекции и разрешения. Идеально подходит для схем обработки сигналов и усилителей.
Нет подробных данных о распиновке для ICL7135CAI+.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
ICL7135CAI+ подходит для 6 применениеs: Digital Panel Meters, Temperature Measurement Instruments, Laboratory Digital Readouts, Industrial Process Monitoring, Portable Metering, Precision Resistance Measurement.
Digital Panel Meters
The ICL7135CAI+ fits digital panel meters because its 4.5-digit format, multiplexed BCD outputs, and 19,999-count maximum reading are directly suited to seven-segment display readouts. The converter measures a differential input and presents a stable decimal display without requiring a separate display-control microcontroller. Its ±1 count in 20,000 accuracy gives the instrument a clear precision target, while the 2.0000 V full-scale capability provides a defined conversion range. In a production design, follow the manufacturer reference and display-driver tables so the converter clock, integrator, display multiplexing, and bypass connections follow the intended timing.
Рекомендуется
Temperature Measurement Instruments
The ICL7135CAI+ is appropriate for thermometers and temperature-monitoring instruments that measure slow-changing analog temperatures. Its high-impedance differential input can support a resistive sensor or conditioned bridge signal, while the 4.5-digit resolution and ±1 count in 20,000 accuracy provide useful display precision. A regulated reference and stable sensor excitation remain necessary to preserve the converter’s stated performance. The part is better suited to a readable laboratory or industrial temperature readout than to a thermal waveform system requiring rapid sampling, and the complete measurement chain should be calibrated as a single system.
Рекомендуется
Laboratory Digital Readouts
The ICL7135CAI+ can form the measurement core of a laboratory digital readout when the instrument needs a stable 4.5-digit result and a direct display interface. Its dual-slope conversion method, differential input, and multiplexed BCD output simplify a display-oriented instrument without requiring a separate digital interface. The 2.0000 V full-scale range is well suited to normalized sensor outputs, but engineers should account for the complete signal path, including input filtering, reference accuracy, and integrator components. For bench equipment, printed calibration instructions and clearly identified input terminals improve usability alongside the converter’s high measurement precision.
Рекомендуется
Industrial Process Monitoring
The ICL7135CAI+ is well matched to industrial process monitoring points where a slowly changing pressure, level, or resistance signal must be shown locally. The differential input reduces sensitivity to shared return-path disturbance, and the 4.5-digit readout can resolve one count in 20,000. Its multiplexed BCD outputs support a direct seven-segment display for panel-mounted equipment. The converter is not the right choice for fast process transients, so the input path should provide sufficient filtering and the design should verify that the measured bandwidth is appropriate. Robust grounding, surge protection, and stable references are especially important in industrial environments.
Рекомендуется
Portable Metering
The ICL7135CAI+ can support portable, battery-powered meter designs when a low-noise digital readout is more important than conversion speed. Its dual-slope architecture and differential measurement are useful for stable readings from resistive probes, and the multiplexed BCD output directly serves a compact display. The product’s 4.5-digit resolution and ±1 count in 20,000 accuracy help distinguish small measurement changes in field equipment. Designers should use the manufacturer’s power, reference, and clock guidance to manage energy use and start-up behavior, and should add suitable input protection for handheld probes or external sensor connections.
Рекомендуется
Precision Resistance Measurement
The ICL7135CAI+ is suitable for a precision ohmmeter or resistance-measurement front end when the test current and reference network are carefully designed. The high-impedance differential input helps accommodate the source impedance of a resistive probe, and the 4.5-digit conversion format is appropriate for laboratory resistance readings. Its stated accuracy must be treated as converter accuracy rather than complete instrument accuracy because lead resistance, excitation drift, contact quality, and reference stability also affect the result. A four-wire arrangement, guarded traces, and calibrated current source can extend practical measurement performance without changing the converter package.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для ICL7135CAI+ — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | ICL7135CAI- |
|---|---|---|
| Package | 28-SSOP | 28-SSOP |
| Brand | Analog Devices | Analog Devices |
| Converter Type | Dual-slope A/D converter | Dual-slope A/D converter |
| Resolution | 4.5 digits | 4.5 digits |
| Maximum Reading | 19,999 counts | 19,999 counts |
| Conversion Accuracy | ±1 count in 20,000 | ±1 count in 20,000 |
| Full-Scale Voltage | 2.0000 V | 2.0000 V |
| Input Configuration | High-impedance differential input | High-impedance differential input |
| Output Format | Multiplexed BCD | Multiplexed BCD |
Ключевые отличия
- Direct multiplexed display interface (против ICL7135CMH-D)
- Defined precision for display-oriented measurement (против ICL7135CAI-)
- High-impedance differential measurement (против ICL7135CMH-D)
Заметки по проектированию
Do not substitute the ICL7135CMH-D for the ICL7135CAI+ on an existing board. The former uses a 44-pin QFP package while the target uses a 28-SSOP package, so the land pattern, pin numbering, and PCB outline are incompatible. For a no-redesign replacement, verify the complete ICL7135CAI- ordering information and operating grade against the schematic and assembly drawings.
Assign the reference, integrator, input, clock, control, and multiplexed display nets strictly from the manufacturer pin-description table. The 28-SSOP footprint provides little package spacing, so route sensitive input and reference connections away from display multiplex lines and switching-node areas. Use a stable ground reference for the converter and connect bypass capacitors close to their specified pins to reduce supply disturbance and digital coupling.
Design the reference and supply network around the manufacturer’s application guidance because measurement accuracy depends on stable reference and integrator behavior. Confirm the exact supply limits, capacitor values, and clock requirements from the current datasheet before release. Avoid adding series impedance to the reference path or placing long, high-impedance routes beside the analog input and integrator nets.
Информация о соответствии
The manufacturer product page and distributor results do not provide extractable RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations for the exact ICL7135CAI+ orderable suffix.
