ICL7137CDL - Dual-Slope 4.5-Digit ADC | Analog Devices
料号： ICL7137CDL ✗ 停产ICL7137CDL 概述
A dual-slope ADC is a type of integrating analog-to-digital converter that measures an unknown input voltage by integrating it for a fixed interval and then measuring the time required to return the integrator to zero. This technique provides good noise immunity for slowly changing signals, including outputs from temperature sensors, pressure transducers, strain gauges, and slow analog measurement systems. The ICL7137 family also incorporates auto-zeroing and auto-calibration functions intended to reduce offset and gain-related errors.
The principal operating characteristics include a commercial temperature range of 0 C to +70 C, bipolar supply operation, automatic calibration, and supply current below 200 uA excluding display current. The low power consumption makes the converter suitable for battery-operated instruments and portable measurement equipment. The direct LED-display interface reduces the need for external display drivers, while the 40-pin DIP package supports conventional through-hole PCB assembly and prototyping.
ICL7137CDL is most appropriate for precision digital voltmeters, panel meters, laboratory measurement equipment, temperature controllers, load-cell instrumentation, and general-purpose slow-rate data acquisition. When designing around the converter, the input signal range, reference voltage, integration period, system resolution, and display driver requirements must be evaluated together. A stable reference and carefully routed analog inputs are important because both directly influence conversion accuracy and repeatability.
Thermal and supply design should account for the component's bipolar supply arrangement and the power contribution from the display. The datasheet should be consulted for the complete electrical limits, recommended operating conditions, input and reference topology, timing relationships, and pin descriptions before laying out a new board. Commercial temperature grade makes this suffix appropriate for indoor laboratory and industrial equipment where the specified ambient range is respected.
This page consolidates the verified product characteristics, comparison limits, application guidance, and replacement considerations. It also identifies unresolved technical fields explicitly so engineers can distinguish documented operating facts from parameters that must be confirmed in the manufacturer datasheet before production release.
直接替换替代料： ICL7137CDL ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ICL7137CDL （相同外形与封装尺寸） ——差异在于 Product Type, Package, Conversion Architecture, Display Interface, Display Output.
ICL7137CPL+
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →ICL7137CQ
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ICL7136CDL
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →ICL7136CPL
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ICL7116CPL+
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →ICL7137CDL 最大额定值与电气特性
| Product Type | 4.5-digit dual-slope analog-to-digital converter |
| Converter Architecture | Dual-slope integrating ADC |
| Supply Configuration | Bipolar power supply |
| 工作温度范围 | 0 C to +70 C |
| Temperature Grade | Commercial |
| Supply Current Excluding LED Display Current | Under 200 uA |
| Calibration | Automatic calibration |
| Display Interface | Direct light-emitting diode display drive |
| Terminal Count | 40 terminals |
| Package Type | DIP through-hole package |
| Package Shape | Rectangular |
| 安装类型 | Through-hole |
| Input Resolution | 4.5 digits |
| AEC-Q100 Qualification | Not applicable |
ICL7137CDL rectangular 引脚配置指南
ICL7137CDL（rectangular 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： ICL7137CDL.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ICL7137CDL 适用于 6 应用s: Digital Panel Meter, Digital Voltmeter, Temperature Measurement Instrument, Pressure Transducer Readout, Load-Cell Instrumentation, Laboratory Data-Acquisition Front End.
Digital Panel Meter
The ICL7137CDL fits standalone digital panel meters because it combines a 4.5-digit dual-slope conversion system with a direct LED-display interface. Its converter supply current below 200 uA, excluding display current, supports low-power portable instruments while the automatic-calibration function helps maintain measurement consistency. The meter designer must accommodate the 40-terminal DIP footprint and verify the required display-drive topology in the manufacturer datasheet. A stable reference and low-leakage analog input path are important for repeatable readings, while the bipolar supply architecture requires an appropriate dual-rail source and decoupling network.
Digital Voltmeter
A digital voltmeter can use the ICL7137CDL when low-rate, high-resolution measurement and direct seven-segment display drive are priorities. The dual-slope architecture is well matched to stable DC inputs, while the 4.5-digit indication provides more resolution than a basic three-and-a-half-digit meter. The under-200-uA converter supply requirement helps limit battery consumption, although display and input-network current must be added to the complete power budget. Designers should select the input divider, reference, integration components, and bypass capacitors from the manufacturer application information.
Temperature Measurement Instrument
The ICL7137CDL can form the measurement front end of a temperature instrument when the sensor output changes slowly and requires a readable local display. Its 4.5-digit dual-slope conversion, automatic calibration, and direct LED-display drive reduce the need for a separate counter and display driver. For thermocouple or RTD designs, the front end still requires amplification, excitation where applicable, linearization, and careful reference routing. Verify the full input range and conversion timing because those limits are necessary for choosing the integration period, display scale, and sensor gain.
Pressure Transducer Readout
The ICL7137CDL suits pressure-transducer readouts in which the sensor produces a slowly changing analog voltage and the operator needs a local numerical display. The integrating dual-slope conversion method is appropriate for suppressing periodic interference, while automatic calibration supports stable instrument performance. A bridge-amplifier or transmitter interface will normally precede the converter. The reference and analog input must remain away from display-driver and switching traces to avoid measurement error, and the completed circuit should be calibrated across the intended pressure and temperature range.
Load-Cell Instrumentation
The ICL7137CDL can be used in a basic load-cell indicator where a slow millivolt-level signal is converted for direct display. The four-and-a-half-digit dual-slope format provides useful resolution for weighing and force-measurement equipment, while the direct LED-display interface supports an economical human-readable output. The load-cell amplifier must provide differential excitation and suitable gain before the converter input. Reference stability, input protection, guarding, grounding, and calibration procedures are critical to repeatable readings, especially when the mechanical system has low-level output signals.
Laboratory Data-Acquisition Front End
The ICL7137CDL can serve as a low-rate laboratory measurement front end when direct display feedback is useful and the input signal changes slowly. Its under-200-uA converter supply current is advantageous in compact or battery-powered instruments, and the direct LED-display interface permits operation without a separate display counter. The device is not a high-throughput waveform converter, so applications requiring rapid sampling should use a different ADC architecture. For laboratory use, verify input bandwidth, reference stability, conversion timing, and error specifications before selecting component values and calibration intervals.
工程参考数据： ICL7137CDL ——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 | ICL7137CPL | ICL7137CQ | ICL7136CDL | ICL7136CPL | ICL7116CPL |
|---|---|---|---|---|---|---|
| Product Type | 4.5-digit dual-slope ADC | Dual-slope ADC | Dual-slope ADC | 4.5-digit dual-slope ADC | Dual-slope ADC | Low-power dual-slope ADC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | DIP-40 through-hole | DIP-40 through-hole | DIP-40 through-hole | DIP-40 through-hole | DIP-40 through-hole | DIP-40 through-hole |
| Conversion Architecture | Dual-slope integrating conversion | Dual-slope integrating conversion | Dual-slope integrating conversion | Dual-slope integrating conversion | Dual-slope integrating conversion | Dual-slope integrating conversion |
| Supply Configuration | Bipolar power supply | Bipolar power supply | Bipolar power supply | Bipolar power supply | Bipolar power supply | Bipolar power supply |
| Terminal Count | 40 terminals | 40 terminals | 40 terminals | 40 terminals | 40 terminals | 40 terminals |
关键差异点
- Direct LED-display integration （对比 ICL7136CDL)
- Documented low converter power consumption （对比 ICL7116CPL)
- Commercial-grade 40-pin DIP implementation （对比 ICL7137CQ)
设计说明
Assign the PCB from the manufacturer pin-description table and keep analog input and reference traces away from display-driver outputs. Place the integration, reference, and bypass components close to their associated pins to minimize leakage and pickup. Because the ICL7137CDL uses a 40-pin DIP, provide adequate spacing for through-hole assembly and avoid placing switching nodes beneath the analog signal path.
Design the bipolar supply so the positive and negative rails remain within the datasheet limits and start in the required sequence. Decouple each supply rail near the device and account separately for converter current and LED display current. The under-200-uA specification excludes display loading, so battery and linear-regulator sizing must include the external display network and any required driver components.
Do not treat a package-compatible family member as a drop-in replacement without comparing pin names and timing behavior. In particular, ICL7136 and ICL7116 variants may differ in display scaling, reference requirements, conversion timing, or temperature grade. Verify the exact suffix, operating limits, and pinout, then perform accuracy and display-output tests on the intended board before production release.
合规信息
The verified product information does not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. The ICL7137CDL is a commercial 0 C to +70 C analog-to-digital converter and is not identified as an AEC-Q100 automotive-qualified device.
