ICL7136CQH+ - Low-Power 3.5-Digit LCD A/D Converter | Analog Devices
料号： ICL7136CQH+ ✓ 量产中ICL7136CQH+ 概述
A 3.5-digit A/D converter is commonly used for panel meters, laboratory instruments, process monitoring, weighing equipment, and portable measurement equipment. The 3.5-digit format provides adequate resolution for displaying a signed or unsigned measurement while maintaining a compact instrument layout. Because the ICL7136 integrates the display interface, the converter can be paired directly with a compatible non-multiplexed LCD when the display and board requirements match the device's electrical and timing specifications.
The ICL7136 architecture is based on a dual-slope conversion approach, a technique commonly used in precision panel-meter converters because it provides good rejection of periodic noise when the integration and reference relationships are designed appropriately. The high input impedance helps isolate the measurement node from the converter input, allowing the sensor or signal-conditioning network to be designed around the required source impedance and measurement range. The integrated voltage reference and clock support a self-contained measurement channel, while the LCD outputs reduce the number of external display-driver connections.
The ICL7136CQH+ is particularly relevant to industrial and laboratory instrumentation where a dedicated numeric LCD readout is preferred over a high-speed sampled data converter. The package and function make it suitable for panel-meter products, handheld test equipment, digital laboratory instruments, process indicators, and data-acquisition front ends with relatively slow measurement requirements. When evaluating the device, check the electrical limits, input configuration, reference requirements, display timing, and pin-specific connection requirements in the manufacturer data sheet.
The 44-lead PLCC package is a through-hole, leaded surface-mount-style package with J-leads, making it different from small-outline and fine-pitch packages used in newer compact instruments. The principal design trade-off is integration and display convenience versus package size and the need to design around the converter's specified operating conditions. For new designs, confirm the exact package variant, temperature range, supply requirements, and pin assignment against the current Analog Devices or Maxim Integrated documentation.
直接替换替代料： ICL7136CQH+ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
ICL7136CQH+TD
✅ 直接替换📋 参考替代料（不在目录中）
ICL7136CQH+D
✅ 直接替换📋 参考替代料（不在目录中）
ICL7136CQH-D
✅ 直接替换📋 参考替代料（不在目录中）
ICL7136CQH+TD
✅ 直接替换📋 参考替代料（不在目录中）
ICL7136CQH+ 最大额定值与电气特性
| Product Type | Low-power 3.5-digit A/D converter with LCD display driver |
| Manufacturer Description | Monolithic analog-to-digital converter |
| 分辨率 | 3.5 digits |
| Conversion Architecture | Dual-slope |
| Display Interface | Direct non-multiplexed LCD drive |
| Integrated Functions | Segment drivers, segment decoders, voltage reference, and clock circuit |
| Input Impedance | Very high; exact value not stated |
| 封装 | 44-LCC (J-Lead) / 44-pin PLCC |
| Package Type | Lead chip carrier with J-leads |
| 安装类型 | Surface mount |
| RoHS 状态 | RoHS-compliant variant indicated in comparison data |
| 生命周期状态 | Production |
ICL7136CQH+ lead chip carrier with j-leads 引脚配置指南
ICL7136CQH+（lead chip carrier with j-leads 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： ICL7136CQH+.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ICL7136CQH+ 适用于 7 应用s: Digital Panel Meter, Laboratory Test Instrument, Process Indicator, Weighing Scale Display, Portable Measurement Instrument, Temperature and Sensor Readout, Digital Thermometer.
Digital Panel Meter
The ICL7136CQH+ is well suited to a digital panel meter because it combines a 3.5-digit conversion function with direct non-multiplexed LCD drive. The integrated segment drivers, decoders, reference, and clock reduce the number of external components needed to produce a readable instrument display. A designer can use the converter for a general-purpose measurement channel and connect the compatible display according to the manufacturer pin and timing requirements. Because the architecture is a dual-slope converter, the strongest fit is a slow meter measurement rather than a rapidly changing waveform. The high input impedance also helps reduce loading of the sensor bridge or resistive divider when the source network is designed correctly.
推荐
Laboratory Test Instrument
The ICL7136CQH+ fits laboratory instruments that require a stable numeric reading rather than high-speed samples. Its high-input-impedance analog front end can reduce the effect of loading on the measurement source, while the integrated voltage reference and clock support a self-contained measurement channel. The direct LCD interface is especially useful for standalone bench instruments with a non-multiplexed display. The design should confirm the required input range and reference arrangement, and should preserve separation between sensitive analog traces and display connections. Its practical advantage is reduced display-interface complexity, while its trade-off is the relatively large 44-lead PLCC footprint and a converter architecture intended for measurement-speed updates.
推荐
Process Indicator
A process indicator can use the ICL7136CQH+ to convert a slowly varying sensor signal into a readable three-and-a-half-digit LCD value. The device's very high input impedance is useful when the source is a resistive sensor or divider, because it helps avoid changing the sensor's operating point. Direct display drive removes the need for a separate LCD-driver IC and reduces board interconnections. Designers should select the external input and reference components to match the required process range, check grounding for common-mode conditions, and keep the analog input path compact. The converter is appropriate when the displayed value changes slowly and visual readability matters more than high-speed data acquisition.
推荐
Weighing Scale Display
The ICL7136CQH+ is appropriate for the display stage of a low-speed weighing system where a load-cell signal must be presented as a direct LCD reading. The converter's high input impedance helps limit loading of the load-cell and signal-conditioning network, and the integrated reference and clock simplify the timing architecture. A practical scale design still requires suitable amplification, filtering, excitation, and input-range selection around the converter. The non-multiplexed LCD outputs provide a compact instrument display without a separate display-driver circuit. Because the package is a 44-pin PLCC, the implementation favors panel-meter and laboratory formats over highly compact wearable products.
推荐
Portable Measurement Instrument
The ICL7136CQH+ can serve as the display and conversion core of a portable measurement instrument when the product uses a dedicated numeric LCD. Its integrated reference, clock, and segment-driver blocks reduce the number of discrete support functions required around a sensitive analog measurement. Low-power operation is important for portable equipment, and the manufacturer specifically identifies the ICL7136 as a low-power converter. Exact battery-life impact depends on the selected display, update interval, and external analog circuitry. The 44-lead PLCC package is less compact than modern no-lead packages, so mechanical design should account for its footprint while benefiting from direct LCD drive and simplified board interconnections.
推荐
Temperature and Sensor Readout
The ICL7136CQH+ can form the numeric readout section of a temperature, pressure, or resistance measurement instrument when the selected sensor produces a compatible slow analog signal. Its very high input impedance helps preserve the source signal when paired with a high-impedance divider or buffer. The integrated LCD interface allows the instrument to present the converted value directly, avoiding a separate display-driver stage. Engineers should establish the input range, reference voltage, source impedance, filtering, and display update timing before finalizing the circuit. This approach is most suitable for dedicated instruments with one numeric measurement and a non-multiplexed LCD rather than multiparameter systems that need simultaneous acquisition.
推荐
Digital Thermometer
The ICL7136CQH+ is compatible with a dedicated digital-thermometer concept that resolves a slow sensor signal and drives a non-multiplexed LCD directly. The device's high input impedance is advantageous when the thermometer uses a resistive sensor and high-value divider, while the integrated reference, clock, and display drivers simplify the overall meter. The external circuit still needs to establish excitation and scaling for the desired temperature range. Panel-meter-style construction is a better fit than ultra-thin wearable packaging because of the 44-pin PLCC footprint. This application also illustrates why a display-specific converter can be more efficient than a general-purpose ADC when the LCD interface is fixed, the measurement rate is low, and visual output is the primary result.
推荐
推荐产品汇总
工程参考数据： ICL7136CQH+ ——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 | ICL7136CQH+TD | ICL7136CQH+D | ICL7136CQH-D | ICL7136CQH+TD |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 44-LCC (J-Lead) / 44-pin PLCC | 44-LCC (J-Lead) / 44-pin PLCC | 44-LCC (J-Lead) / 44-pin PLCC | 44-LCC (J-Lead) / 44-pin PLCC | 44-LCC (J-Lead) / 44-pin PLCC |
| Product Type | 3.5-digit A/D converter with LCD display driver | 3.5-digit A/D converter with LCD display driver | 3.5-digit A/D converter with LCD display driver | 3.5-digit A/D converter with LCD display driver | 3.5-digit A/D converter with LCD display driver |
| Conversion Architecture | Dual-slope | Dual-slope | Dual-slope | Dual-slope | Dual-slope |
| Display Output | Direct non-multiplexed LCD drive | Direct LCD drive | Direct LCD drive | Direct LCD drive | Direct LCD drive |
| Integrated Functions | Segment drivers, segment decoders, voltage reference, and clock circuit | Segment drivers, segment decoders, voltage reference, and clock circuit | Segment drivers, segment decoders, voltage reference, and clock circuit | Segment drivers, segment decoders, voltage reference, and clock circuit | Segment drivers, segment decoders, voltage reference, and clock circuit |
| Input Impedance | Very high | Very high | Very high | Very high | Very high |
关键差异点
- Integrated display interface reduces external circuitry （对比 MCP3424-E/SL)
- Direct non-multiplexed LCD excitation （对比 ICL7116CPL+)
- Measurement-oriented dual-slope architecture （对比 ADS1254E)
设计说明
Confirm the 44-pin PLCC footprint and pin-1 orientation against the package drawing before PCB release. Place the input, reference, and decoupling networks close to their associated ICL7136CQH+ pins, and route sensitive analog traces away from switching-regulator outputs and display conductors. Because the device includes display-drive circuitry, inspect the board for ground-current paths that could couple display activity into the analog measurement node.
Do not assume every LCD can be connected directly to the converter. Verify the display is non-multiplexed, confirm the segment assignments and logic levels, and follow the manufacturer's timing and connection requirements. Also check that the external input and reference network supports the intended measurement range. A display-only connection error can prevent valid readings even when the converter itself is operating correctly.
Budget supply decoupling according to the manufacturer recommendations and keep the analog and display-return paths within the documented grounding scheme. The ICL7136CQH+ is identified as a low-power converter, but actual supply demand depends on the operating mode, display, and update interval. Validate the complete power budget at the intended supply voltage and temperature rather than sizing solely from a generic quiescent-current estimate.
合规信息
The ICL7136CQH+ comparison information identifies a RoHS-compliant variant. Other compliance attributes are not established for the exact MPN.
