ICL7107CMH+ - 3.5-Digit Dual-Slope ADC | Analog Devices
MPN： ICL7107CMH+ ✓ 啟用中ICL7107CMH+ 概覽
An ADC converts an analog voltage into a numeric value for measurement, control, or display. The ICL7107 belongs to the dual-slope ADC family, where an unknown input voltage is compared with a reference through integrated and de-integrated phases. This measurement technique is especially useful for slow-moving signals from sensors, resistive transducers, and laboratory instruments because its averaging behavior helps reject periodic interference present in industrial environments. Its architecture also supports ratiometric measurements in which the result depends on the ratio of input voltage to reference voltage.
The primary features of the ICL7107CMH+ include its 3.5-digit conversion format, dual-slope conversion technique, true differential analog input, true differential reference input, and direct LED display drive. The integrated display outputs reduce the component count required for common digital panel meters. The zero-integrator phase described for the ICL7106 and ICL7107 family allows the integrator to return to a defined state between measurement cycles, supporting repeatable operation in successive conversion cycles. Its operating limits, conversion time, input ranges, and reference requirements must be confirmed from the manufacturer datasheet for the selected system implementation.
The ICL7107 is intended for instrumentation rather than high-speed waveform acquisition. Dual-slope conversion prioritizes resolution and rejection of common interference over conversion speed, making it suitable for panel meters, laboratory measurement equipment, process monitoring, weighing systems, and temperature or bridge-based instrumentation. Differential measurement also helps reject common-mode voltage when the source and return paths are arranged carefully, provided the input common-mode range and reference limits are respected.
Common implementations place the ICL7107CMH+ between a sensor or bridge and a seven-segment display. The analog input is conditioned before entering the converter, while the reference and common terminals establish the measurement range. External timing, reference, and display components must follow the recommended application circuit. Care is required when routing the analog input and reference nets because long traces and high-impedance nodes can increase noise pickup, and the LED display driver outputs should not be confused with the analog measurement pins.
Designers should confirm the exact pin function for every connection using the pin-description table in the Analog Devices datasheet. The 10 mm by 10 mm MQFP footprint requires a land pattern with adequate thermal and solder-joint area, while the analog input and reference routing should be kept away from display-driver and switching-node traces. When replacing another display ADC, verify not only the conversion resolution but also input range, reference topology, display-drive capability, package dimensions, pin assignment, and conversion timing.
This page combines the manufacturer product information, package identification, family-level operating characteristics, qualified same-package order variants, and practical implementation guidance. It also highlights the measurements that must be checked before substitution, helping engineers distinguish genuine pin-compatible options from parts that merely share the same conversion category or display function.
直接替換替代品，適用於 ICL7107CMH+ — 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。
ICL7107CMH+TD
✅ 直接替換📋 參考替代品（不在目錄中）
ICL7107CMH+D
✅ 直接替換📋 參考替代品（不在目錄中）
ICL7107CMH+T
✅ 直接替換📋 參考替代品（不在目錄中）
ICL7107CMH
✅ 直接替換📋 參考替代品（不在目錄中）
ICL7107CMH+ 最大額定值與電氣特性
| Conversion Type | Dual-slope analog-to-digital conversion |
| Display Resolution | 3.5 digits |
| Manufacturer Product Description | 3 1/2-digit analog-to-digital converter |
| Package Type | 44-pin MQFP |
| Package Body Size | 10 mm x 10 mm |
| Input Configuration | True differential input |
| Reference Configuration | True differential reference |
| Display Output Type | Seven-segment LED display driver |
| Integrator Reset Feature | Zero-integrator phase |
| Ratiometric Measurement Support | Supported |
| RoHS 狀態 | unknown |
| REACH Status | unknown |
| Automotive Qualification | not_applicable |
ICL7107CMH+ 10 mm x 10 mm 腳位配置指南
ICL7107CMH+（10 mm x 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： ICL7107CMH+.
請參閱 資料表 以查看完整腳位配置。
典型應用
ICL7107CMH+ 適用於 6 應用s: Digital Panel Meters, Temperature Measurement, Weighing and Load Measurement, Laboratory Instrumentation, Process Monitoring and Control, Audio and Communication Equipment.
Digital Panel Meters
The ICL7107CMH+ fits digital panel meters because it combines a 3.5-digit dual-slope ADC with seven-segment LED display drive in one 44-pin MQFP device. The converter measures a differential analog input and then drives the display segments, reducing the need for a separate display driver and front-end counter. This integration is useful for bench meters, process indicators, and monitoring equipment where a readable numeric result is the primary interface. Before layout release, confirm the required segment count, digit common arrangement, input range, and reference voltage in the manufacturer application circuit.
推薦
Temperature Measurement
The ICL7107CMH+ can present a resistance-based temperature sensor measurement directly on a seven-segment display. A suitable bridge or sensing network can generate a differential voltage proportional to temperature, while the converter’s true differential input and reference reduce sensitivity to shared ground offsets in the measurement path. The slow conversion behavior of dual-slope measurement is appropriate for temperature signals that change gradually. The designer must still verify the input common-mode range, excitation method, and reference polarity against the temperature sensor and sensor-amplifier circuit.
推薦
Weighing and Load Measurement
ICL7107CMH+ is appropriate for compact weighing systems in which a load-cell bridge produces a differential signal and the result is shown locally. Dual-slope conversion averages the bridge output over repeated cycles, which favors stable readings over rapid tracking. The differential reference arrangement supports ratiometric excitation when the bridge supply and converter reference share a controlled relationship. For a complete design, confirm excitation voltage, bridge sensitivity, input range, filter requirements, and whether the desired update rate is appropriate for the mechanical measurement system.
推薦
Laboratory Instrumentation
The ICL7107CMH+ provides an economical local readout for laboratory instruments that measure slow differential voltages. Its 3.5-digit format gives sufficient resolution for many voltage, resistance, and process-calibration displays without requiring a separate counter. The dual-slope architecture helps reject periodic interference encountered around motors, relays, and switching power equipment, while differential connections help control common-mode error. The instrument designer should validate input overrange behavior, reference stability, calibration method, and display settling time against the required measurement accuracy.
推薦
Process Monitoring and Control
ICL7107CMH+ is well suited to industrial process indicators that monitor a controlled variable and need a clear numeric display. A scaled transmitter or sensor can drive the differential input, and the LED output can show process state without a graphical display or communications link. The converter’s dual-slope method is advantageous where mains-related interference and slow process dynamics are present. Design work should include input protection, reference conditioning, grounding, and calibration checks so the displayed value remains repeatable over the full process range.
推薦
Audio and Communication Equipment
ICL7107CMH+ can be used as a simple level-monitoring element in professional audio, communications, or test equipment where an operator needs a local numeric indication of a controlled bias, supply, or signal level. The converter is intended for relatively slow measurements, so it should not be selected for audio waveform capture. Its integrated LED drive can eliminate a separate display counter in simple panels. The design must ensure that the measured level lies within the input and common-mode limits and that display-driver current remains compatible with the chosen LED arrangement.
推薦
推薦產品摘要
工程參考資料，適用於 ICL7107CMH+ — 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 | ICL7107CMH+TD | ICL7107CMH+D | ICL7107CMH+T | ICL7107CMH |
|---|---|---|---|---|---|
| Package | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| ADC Resolution | 3.5 digits | 3.5 digits | 3.5 digits | 3.5 digits | 3.5 digits |
| Conversion Technique | Dual-slope | Dual-slope | Dual-slope | Dual-slope | Dual-slope |
| Input Configuration | True differential | True differential | True differential | True differential | True differential |
| Reference Configuration | True differential | True differential | True differential | True differential | True differential |
| Display Output | Seven-segment LED display driver | Seven-segment LED display driver | Seven-segment LED display driver | Seven-segment LED display driver | Seven-segment LED display driver |
| Order Code | ICL7107CMH+ | ICL7107CMH+TD | ICL7107CMH+D | ICL7107CMH+T | ICL7107CMH |
主要差異化特點
- Integrated display and conversion functionality (對比MCP3424-E/SL)
- Differential measurement architecture (對比ADS1254E)
- Same-package family options for temperature and production requirements (對比ICL7107CMH+TD)
- Ratiometric instrumentation support (對比PCM1808PW)
設計說明
Assign the 44-pin MQFP land pattern from the Analog Devices package drawing and route the analog input and differential reference as short, quiet nets. Keep display-driver traces and external switching-node copper away from the measurement inputs. Place input filtering and reference components close to their associated pins, and connect the exposed thermal or ground structure according to the manufacturer package recommendation.
Protect the differential input and reference from high-impedance leakage, condensation, and contaminated PCB surfaces because small parasitic currents can affect precision measurements. Use a guarded or analog-ground layout where practical, avoid test-point current leakage near the input nodes, and follow the recommended input-filter values. Verify common-mode range at the actual connector and sensor ground because a valid differential reading can still overrange the device.
Do not approve a replacement based only on the MQFP body size. Compare numbered pin assignments, supply voltage, input range, reference polarity, display segment outputs, common digit connections, operating-temperature grade, and production packing. The ICL7107CMH+TD, ICL7107CMH+D, and ICL7107CMH+T order codes are related variants, but their suffix attributes must be checked before substitution.
Separate the analog measurement area from the LED display wiring and route display current away from the reference and input terminals. Decoupling capacitors should be located at the supply and ground pins with short, low-inductance connections. Use the manufacturer reference design and pin table to establish oscillator, reset, digit-common, and segment connections rather than inferring their functions from the package position.
合規資訊
The Analog Devices product page identifies the ICL7107 family as production, but no specific RoHS, REACH, lead-free, halogen-free, or conflict-minerals declaration appears in the supplied product information.
