ICL7126CQH - 3.5-Digit LCD A/D Converter | Analog Devices
料号： ICL7126CQH ✓ 量产中ICL7126CQH 概述
The ICL7126CQH belongs to the ADC/DAC category of signal-conversion semiconductors. An A/D converter, also called an analog-to-digital converter, transforms a continuously varying analog voltage into a numeric code suitable for measurement, display, control, or data acquisition. A 3.5-digit converter can resolve approximately 1999 principal counts and is commonly used for panel meters, laboratory instruments, industrial readouts, and portable measurement systems where more resolution than a simple three-digit display provides is useful.
The manufacturer describes the ICL7126 family as a low-power device intended to drive liquid-crystal displays directly. Its integrated seven-segment decoders reduce the external logic required between the conversion result and the LCD. Direct LCD drive simplifies instrument construction by limiting the main external circuitry to the input network, timing components, display connections, and normal bypass or protection components described in the manufacturer data sheet.
The ICL7126CQH is specified in the 44-LCC J-lead package and appears on the manufacturer's product page as a production product. Analog Devices also recommends the ICL7136 for new designs, which is an important lifecycle consideration when selecting between continued use of an established converter and migration to a newer family member. The exact electrical limits, conversion timing, input impedance, reference characteristics, display-drive specifications, and environmental ratings should be taken from the ICL7126 manufacturer data sheet before release of a production circuit.
Common uses include digital panel meters, digital multimeters, laboratory measurement instruments, temperature controllers, process-monitoring displays, weighing systems, and portable data-acquisition equipment. The integrated display path is particularly useful where designers want a numeric readout without adding a separate display decoder or driver IC.
When designing around the ICL7126CQH, begin with the manufacturer pin-description table and application information rather than assigning signals by function alone. Confirm the LCD glass segment mapping, input-source range, reference arrangement, timing components, and bypass requirements directly against the data sheet. Also evaluate the suggested ICL7136 before committing to a long-lived design if the project is newly started.
This page organizes the verified package, display, resolution, interface, lifecycle, and sourcing details into an engineering-focused format. It also separates confirmed attributes from parameters that require direct comparison against the manufacturer data sheet, helping designers assess fit before committing the 44-LCC footprint to a PCB layout.
直接替换替代料： ICL7126CQH ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
ICL7126CQH-D
✅ 直接替换📋 参考替代料（不在目录中）
ICL7126CQH+D
✅ 直接替换📋 参考替代料（不在目录中）
ICL7126CQH 最大额定值与电气特性
| Product Type | 3.5-digit A/D converter with LCD display driver |
| 分辨率 | 3.5 digits |
| Display Digits or Characters | A/D 3.5 digits |
| Display Configuration | 7-segment |
| Display Type | LCD |
| 接口类型 | Direct LCD display interface |
| 封装 | 44-LCC (J-Lead) |
| Package Code | QCCJ |
| Package Shape | Square |
| Terminal Form | J Bend |
| Number of Terminals | 44 |
| Temperature Grade | Commercial |
| Conversion Method | Dual-slope A/D conversion |
| Integrated Functions | Seven-segment decoders, display drivers, reference, and clock |
| Process Technology | CMOS |
ICL7126CQH square 引脚配置指南
ICL7126CQH（square 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： ICL7126CQH.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ICL7126CQH 适用于 6 应用s: Digital Panel Meters, Laboratory Measurement Instruments, Industrial Process Readouts, Temperature Measurement Displays, Portable Data Acquisition, Weighing and Calibration Systems.
Digital Panel Meters
The ICL7126CQH fits digital panel meters that require a stable numeric LCD readout without a separate display-decoder IC. Its confirmed 3.5-digit resolution and seven-segment display architecture suit instrument scales that benefit from finer display resolution than a three-digit display. The dual-slope converter and integrated reference, clock, decoder, and display-driver blocks simplify the signal chain. Engineers should use the manufacturer data sheet to set the input range, timing, reference configuration, and segment mapping for the chosen LCD glass.
推荐
Laboratory Measurement Instruments
ICL7126CQH is appropriate for laboratory instruments where a three-and-a-half-digit LCD is the intended readout format. The integrated seven-segment decoder and LCD drivers remove several discrete display-interface functions, while the 3.5-digit result supports clear numerical readings in bench meters and process monitors. The device must be paired with suitable input conditioning and a matched display glass. Before layout release, verify timing, reference, bypass, and segment assignments against the manufacturer data sheet.
推荐
Industrial Process Readouts
The ICL7126CQH can be used in industrial process-monitoring equipment that presents a sensor-derived measurement on an LCD. A 3.5-digit format provides approximately 1999 principal counts, while direct seven-segment drive reduces the need for external display logic. Commercial temperature grade makes the part appropriate for many indoor industrial environments, subject to the exact environmental limits in the data sheet. Protection, isolation, calibration, and input filtering must be designed around the measured signal and operating environment.
推荐
Temperature Measurement Displays
ICL7126CQH is suitable for a compact temperature display when the sensor signal is conditioned to the converter's supported input range. Its integrated LCD path supports a clear 3.5-digit readout for thermometers, controllers, and environmental monitors. The external circuit should include the required sensor conditioning, input filtering, and reference components defined by the manufacturer application guidance. Verify the glass segment layout and startup behavior during prototype bring-up to prevent errors that resemble incorrect temperature readings.
推荐
Portable Data Acquisition
ICL7126CQH supports portable measurement products where a compact LCD provides immediate local feedback from a low-power acquisition system. The integrated conversion and display functions reduce board-area requirements, and the 3.5-digit readout offers useful resolution for portable scales, calibrators, and field-service instruments. Battery-operated designs still require careful attention to the converter's actual supply current and power-dissipation limits. Confirm those figures and the permitted input configuration directly from the manufacturer data sheet.
推荐
Weighing and Calibration Systems
ICL7126CQH can form the display section of a compact weighing or calibration instrument when the load-cell or sensor output is properly scaled. The 3.5-digit seven-segment readout provides a clear numerical result for bench scales and portable calibrators, while integrated decoding reduces display-interface complexity. A production design should validate zeroing, span, excitation stability, input filtering, and display calibration. The manufacturer timing and reference recommendations should be followed because they directly affect repeatability and initial reading recovery.
推荐
推荐产品汇总
工程参考数据： ICL7126CQH ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ICL7126CQH-D | ICL7126CQH+D |
|---|---|---|---|
| Manufacturer | Analog Devices | Analog Devices | Analog Devices |
| Package | 44-LCC (J-Lead) | 44-LCC (J-Lead) | 44-LCC (J-Lead) |
| Package Code | QCCJ | QCCJ | QCCJ |
| Terminal Count | 44 | 44 | 44 |
| Terminal Form | J Bend | J Bend | J Bend |
| Conversion Method | Dual-slope | Dual-slope | Dual-slope |
| Resolution | 3.5 digits | 3.5 digits | 3.5 digits |
| Display Output | Direct 7-segment LCD | Direct 7-segment LCD | Direct 7-segment LCD |
| Lifecycle Recommendation | ICL7126 production; ICL7136 suggested for new designs | ICL7126 family ordering code | ICL7126 family ordering code |
关键差异点
- Integrated display interface reduces external circuitry （对比 AD779JN)
- Purpose-built 3.5-digit numerical readout （对比 ADS1254E)
- Established production family with manufacturer-supported migration path （对比 ICL7136)
设计说明
Use the manufacturer's pin-description table and LCD glass segment map before assigning tracks on the 44-LCC J-lead board. Keep the analog input and reference paths away from display segment outputs, especially when the converter is used with long LCD interconnects. The 44-LCC footprint has more pins than many low-cost microcontroller packages, so verify pad geometry and assembly clearances against the QCCJ drawing before committing the board outline.
Follow the manufacturer input-voltage, reference, and bypass requirements exactly. The confirmed package and converter architecture do not by themselves establish allowable supply combinations, so do not infer a safe rail from another ICL family member. Place required bypass capacitors close to their specified pins, maintain the recommended grounding topology, and keep switching-regulator and display-return currents out of the analog input and reference paths.
Do not treat mechanically similar LCDs as electrically interchangeable. Segment outputs, common-drive arrangements, and pin assignments can differ between display glasses. Validate the ICL7126CQH-to-LCD connection against the display datasheet and the converter pin table, then check every digit and annunciator segment during production test. Also verify the exact ICL7126 ordering suffix before treating ICL7126CQH-D or ICL7126CQH+D as a procurement substitute.
Plan the analog input and reference network close to the converter while allowing the display signals to reach the LCD connector without crossing sensitive measurement nodes. Confirm whether the chosen LCD interface uses common or segment-drive arrangements described in the data sheet. Maintain accessible test points for input, reference, and display timing so calibration and troubleshooting can be performed without redesigning the board.
合规信息
The verified records identify a commercial-grade integrated circuit but do not provide exact-ordering-code RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 is not applicable because this is a commercial measurement IC rather than an automotive-qualified claim shown in the records.
