ICL7136CMH - Low-Power 3.5-Digit ADC | Analog Devices
MPN： ICL7136CMH ✓ 啟用中ICL7136CMH 概覽
An ADC is a semiconductor that converts an analog voltage into a numeric value. The ICL7136 belongs to the dual-slope ADC family, a class of converters that integrates an input signal over a fixed interval and measures the resulting integration time against a reference. This technique is well suited to instruments where predictable behavior, rejection of periodic interference, and usable resolution matter more than very high conversion speed.
Key features include automatic calibration, true differential input, and a differential reference arrangement. Automatic calibration helps establish a repeatable measurement baseline, while the dual-slope architecture rejects interference signals common in industrial environments. Differential measurements also support ratiometric sensing, where output code depends on the ratio of an unknown input to a related reference.
The ICL7136 integrates a 3.5-digit BCD-to-seven-segment display driver, allowing measured values to be presented directly on common digital display devices. This combination of measurement and display excitation simplifies panel-meter, laboratory-instrument, and industrial-control designs by reducing the number of external interface components.
Typical uses include digital panel meters, temperature measurement systems, resistive and bridge transducers, laboratory meters, and process-monitoring equipment. The differential input and reference architecture is particularly useful in ratiometric measurements, where sensing-element drift can be reduced when the excitation and measurement paths share corresponding variations.
When designing around the ICL7136CMH, preserve the analog and reference layout implied by the manufacturer application guidance, use suitable input and reference filtering, and verify display-drive compatibility with the selected seven-segment display. Because the MQFP-44 package has fine-pitch leads and a thermal pad, assembly and layout planning should account for lead geometry, soldering process, and thermal dissipation.
This product page consolidates the confirmed ICL7136 family characteristics, sourcing information, same-package alternatives, and practical selection guidance. It helps engineers compare the commercial-grade ICL7136 variants by package, temperature range, supply voltage, and power rating before committing to a PCB footprint.
直接替換替代品，適用於 ICL7136CMH — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
ICL7136CMH+TD
✅ 直接替換📋 參考替代品（不在目錄中）
ICL7136CMH+D
✅ 直接替換📋 參考替代品（不在目錄中）
ICL7136CQH+TD
✅ 直接替換📋 參考替代品（不在目錄中）
ICL7136CQH+D
✅ 直接替換📋 參考替代品（不在目錄中）
ICL7136CMH 最大額定值與電氣特性
| ADC Type | 3.5-digit dual-slope A/D converter |
| 解析度 | 3.5 digits |
| Number of Input Channels | 1 channel |
| Input Architecture | True differential |
| Reference Architecture | Differential reference |
| Calibration | Automatic calibration |
| Display Output | 3.5-digit, seven-segment display driver |
| 工作電源電壓 | 9 V |
| Power Dissipation | 500 mW (1/2 W) |
| Minimum Operating Temperature | 0 °C |
| Maximum Operating Temperature | 70 °C |
| Package Type | MQFP-44 (10 mm × 10 mm) |
| 腳位數 | 44 pins |
| 安裝類型 | Surface mount |
| Screening Level | Commercial |
| Technology | CMOS |
| RoHS 狀態 | RoHS compliant |
ICL7136CMH mqfp-44 (10 mm × 10 mm) 腳位配置指南
ICL7136CMH（mqfp-44 (10 mm × 10 mm) 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： ICL7136CMH.
請參閱 資料表 以查看完整腳位配置。
典型應用
ICL7136CMH 適用於 6 應用s: Digital Panel Meters, Temperature Measurement Instruments, Resistive and Bridge Transducers, Laboratory Digital Meters, Process Monitoring Equipment, Precision DC Voltage Display.
Digital Panel Meters
The ICL7136CMH fits digital panel meters because it combines a 3.5-digit dual-slope conversion system with seven-segment display-driver outputs. That integration can reduce the external circuitry needed to convert a measured voltage into a visible numerical result. The confirmed 9 V operating supply and 0 °C to 70 °C commercial range suit instrument-grade panel equipment operating in controlled ambient conditions. Differential input and reference connections also support grounded or floating sensor arrangements when correctly referenced. Designers should verify display polarity, segment drive requirements, and timing behavior against the manufacturer pin description and typical application circuit before finalizing the PCB.
推薦
Temperature Measurement Instruments
The ICL7136CMH is appropriate for thermometer and temperature-controller front ends that require a readable low-resolution measurement rather than rapid waveform acquisition. Its 3.5-digit dual-slope ADC provides a direct path from a conditioned sensor voltage to a seven-segment display, while true differential input and differential reference support carefully referenced measurements. Automatic calibration helps establish a repeatable operating baseline. The sensor signal must remain within the converter’s permitted input and reference ranges, and the circuit should include suitable filtering and protection. For thermocouple systems, a dedicated cold-junction and linearization stage remains necessary before the ICL7136 input stage.
推薦
Resistive and Bridge Transducers
The ICL7136CMH is well suited to resistive and strain-bridge measurements because its differential input and differential reference support ratiometric sensing. In a ratiometric arrangement, the reference is derived from the same excitation used by the bridge, helping compensate for excitation variation. The dual-slope conversion method also rejects periodic interference common in industrial environments. Engineers should keep input and reference routing balanced, provide filtering at the transducer interface, and account for lead and contact resistance. The 0 °C to 70 °C operating range limits unrestricted industrial deployment unless the selected operating environment remains within that interval.
推薦
Laboratory Digital Meters
The ICL7136CMH can serve as the measurement core of a laboratory digital meter when the required readout is approximately 3.5 digits. It combines dual-slope measurement, automatic calibration, differential analog connections, and seven-segment display drive in one device. This architecture is useful for handheld or bench instruments designed around stable readings rather than rapid conversion. Input conditioning determines accuracy more than the converter alone, so designers should establish input range, overrange behavior, reference quality, and filtering before populating the board. The commercial temperature range and MQFP-44 footprint should be checked against the enclosure’s thermal conditions and assembly capabilities.
推薦
Process Monitoring Equipment
The ICL7136CMH is applicable to slow-changing process variables that can be represented by a 3.5-digit panel display. Its dual-slope conversion approach, automatic calibration, and differential reference structure suit monitoring equipment where repeatable readings and common-mode interference rejection are important. A transducer can drive the differential input while a corresponding excitation-derived reference improves ratiometric behavior. The converter does not replace the required signal-conditioning amplifier, protection network, or sensor excitation regulator. Firmware or display control should also be designed around the converter’s conversion and blanking behavior rather than treating it as a conventional high-speed successive-approximation ADC.
推薦
Precision DC Voltage Display
The ICL7136CMH can provide a direct digital presentation of a conditioned DC voltage. Differential input and reference connections allow the converter to operate within a carefully defined analog system, while automatic calibration supports stable display readings. This is useful for power-supply test panels, laboratory monitors, and service equipment where a numerical reading is more useful than raw samples. The front end must keep the measured signal within the input range and protect the inputs from transients. Because the confirmed architecture performs approximately 3.5-digit measurement, engineers should set expectations accordingly and use the manufacturer conversion timing, input filter, and display-driver guidance in the final design.
推薦
推薦產品摘要
工程參考資料，適用於 ICL7136CMH — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ICL7136CMH+TD | ICL7136CMH+D | ICL7136CQH+TD | ICL7136CQH+D |
|---|---|---|---|---|---|
| Package | MQFP-44 (10 mm × 10 mm) | MQFP-44 (10 mm × 10 mm) | MQFP-44 (10 mm × 10 mm) | MQFP-44 (10 mm × 10 mm) | MQFP-44 (10 mm × 10 mm) |
| Brand | Analog Devices | Maxim Integrated | Analog Devices | Analog Devices | Analog Devices |
| ADC Type | 3.5-digit dual-slope A/D converter | 3.5-digit dual-slope A/D converter | 3.5-digit dual-slope A/D converter | 3.5-digit dual-slope A/D converter | 3.5-digit dual-slope A/D converter |
| Operating Supply Voltage | 9 V | 9 V | 9 V | 9 V | 9 V |
| Display Driver | 3.5-digit seven-segment display driver | 3.5-digit seven-segment display driver | 3.5-digit seven-segment display driver | 3.5-digit seven-segment display driver | 3.5-digit seven-segment display driver |
| Calibration | Automatic calibration | Automatic calibration | Automatic calibration | Automatic calibration | Automatic calibration |
| Input Type | True differential input | True differential input | True differential input | True differential input | True differential input |
主要差異化特點
- Integrated measurement and display function (對比ICL7136CM44)
- Directly identified commercial ordering configuration (對比ICL7136CQH+TD)
- Automatic calibration with differential measurement (對比ICL7136CMH+D)
設計說明
Place the input, reference, supply, and decoupling connections according to the manufacturer’s typical application circuit. Keep the true-differential input paths compact and symmetrical so that noise or resistance differences do not unbalance the measurement. Connect the MQFP-44 thermal pad to the recommended copper plane, but avoid accidental shorts between the pad and signal pins. Confirm land geometry against the package drawing before releasing artwork.
Use symmetric input routing and place input and reference filtering close to the converter. The dual-slope architecture rejects periodic interference, but it does not eliminate unwanted RF pickup or poor grounding. Keep display-driver connections away from sensitive analog inputs, provide a clean reference connection, and use a local supply bypass path. Validate the completed board with slow input ramps and expected noise sources rather than relying only on a static meter reading.
The confirmed commercial configuration has a 500 mW power-dissipation rating. Estimated: at a 9 V supply and a 500 mW dissipation limit, the absolute theoretical current limit is 55.6 mA before allowing for display drive and other loads; use the actual operating current and ambient temperature for a more representative thermal calculation. Provide copper area under the MQFP package and verify the assembled temperature rise against the device limit.
Do not treat the 3.5-digit ADC as a high-speed converter or substitute a part based only on the MQFP-44 package name. Verify ordering suffix, 9 V supply, temperature range, display polarity, reference polarity, and every pin connection. The ICL7136CQH+TD comparison record lists 733 mW power dissipation, but a higher power rating alone does not prove drop-in compatibility across all operating conditions.
合規資訊
The ICL7136CMH comparison record identifies the device as RoHS compliant. AEC-Q100 qualification is not applicable to this commercial-grade ADC, and no separate REACH, lead-free, halogen-free, or conflict-minerals conclusions were identified.
