ICL7126CPL+ - 3.5-Digit Dual-Slope ADC | Analog Devices
Référence : ICL7126CPL+ ✓ ActifICL7126CPL+ Présentation
An integrating ADC such as the ICL7126 converts an analog input into a time-proportional digital result by repeatedly integrating the input and measuring the interval required to return to zero. Within the broader semiconductor hierarchy, the ICL7126 is a dual-slope ADC, which is an ADC, which is a data-conversion IC within integrated circuits. This makes it suitable for compact panel-meter and laboratory instrumentation designs where the display driver functions are useful.
The principal verified features include 3.5-digit measurement resolution, a 3-SPS conversion rate, low power operation, a 40-pin PDIP package, and integrated segment decoders and drivers. The integrated voltage reference and clock reduce the number of external support circuits needed for a basic digital panel meter. The device also contains the active components required to implement a complete measurement system rather than operating only as a numeric converter.
The ICL7126 uses a dual-slope conversion method, integrating both the unknown input and a known reference during successive measurement intervals. Its architecture is intended for high-input-impedance measurement systems. According to the Analog Devices product page, the monolithic converter directly drives a non-multiplexed LCD, while the Renesas datasheet identifies the ICL7126 as a plug-in replacement for the ICL7106 when only passive components are changed.
Typical uses include digital panel meters, laboratory meters, process monitoring equipment, temperature and pressure instrumentation, and other low-rate measurement systems with a three-digit display. The integrated display drivers are especially useful when the measured quantity must be presented locally without requiring a separate display controller, microprocessor, or complex display multiplexer.
The principal design consideration is that the analog front end, reference network, timing components, and LCD interface must be evaluated together rather than as independent blocks. Grounding, input filtering, reference stability, LCD contrast, and conversion timing determine whether the complete meter achieves useful accuracy. Designers should follow the manufacturer application guidance and verify the exact electrical limits against the current datasheet before finalizing component values.
This product page consolidates verified manufacturer information, distributor availability, package details, replacement guidance, and engineering-oriented application guidance. It also distinguishes the verified ICL7126 family information from replacement candidates whose individual electrical ratings still require engineering confirmation against the latest manufacturer datasheets.
Alternatives de remplacement direct pour ICL7126CPL+ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
ICL7126CPL
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ICL7126CMZ
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
TC7126IPL
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TC7126CPL
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ICL7126CSZ
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ICL7126CPL+ Valeurs maximales et caractéristiques électriques
| Product Type | 3.5-digit dual-slope analog-to-digital converter |
| Manufacturer | Analog Devices Inc./Maxim Integrated |
| Conversion Method | Dual-slope |
| Conversion Rate | 3 conversions per second |
| Display Resolution | 3.5 digits |
| Input Type | Single analog input |
| ADC Architecture | Monolithic CMOS integrating ADC |
| Integrated Voltage Reference | Yes |
| Integrated Clock | Yes |
| Seven-Segment Decoders | Yes |
| Display Drivers | Yes |
| Supported Display | Non-multiplexed LCD |
| Input Impedance | Very high input impedance |
| Power Class | Low power |
| Boîtier | 40-pin PDIP |
| Type de montage | Through-hole |
Guide de configuration des broches du ICL7126CPL+ 40-pin pdip
Configuration des broches du ICL7126CPL+ (boîtier 40-pin pdip). Ce composant analogique comporte des broches d'entrée, de sortie et d'alimentation. Consultez la fiche technique du fabricant pour les configurations des broches d'annulation d'offset, de compensation et d'activation. Idéal pour le conditionnement de signaux et les circuits amplificateurs.
Aucune donnée de brochage détaillée disponible pour ICL7126CPL+.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ICL7126CPL+ convient pour 6 applications: Digital Panel Meter, Laboratory Voltage Measurement, Temperature Instrumentation, Pressure Measurement Display, Process Monitoring Indicator, Battery-Powered Portable Instrument.
Digital Panel Meter
The ICL7126CPL+ fits a digital panel meter because it combines a 3.5-digit dual-slope ADC, seven-segment decoders, display drivers, a voltage reference, and a clock on one 40-pin PDIP device. Its 3-conversions-per-second rate is appropriate for slowly changing measurements such as voltage, current, temperature, or pressure rather than waveform acquisition. The integrated non-multiplexed LCD drive circuitry reduces the number of external components and eliminates the need for a separate display-driver IC. Design verification should confirm the LCD segment arrangement, input range, reference accuracy, and timing values from the current manufacturer datasheet.
Recommandé
Laboratory Voltage Measurement
The ICL7126CPL+ is suitable for a laboratory voltage-measurement instrument that requires a stable three-digit display rather than a high-speed data stream. Its very high input impedance helps reduce loading of the measured source, while the integrated voltage reference, clock, segment decoders, and LCD drivers establish a compact measurement channel. The 3-SPS dual-slope conversion rate supports manual or slowly updated readings. A practical instrument should still include input protection, defined reference routing, appropriate filtering, and an input range selected to preserve the converter's usable resolution.
Recommandé
Temperature Instrumentation
The ICL7126CPL+ can present a temperature-derived voltage as a local three-digit LCD reading in thermometers, process indicators, and industrial monitoring panels. The ADC's 3.5-digit format and 3-SPS update rate suit thermal signals that change more slowly than the display needs to refresh. Its integrated reference and LCD drive functions reduce system complexity compared with a separate ADC and display controller. The principal engineering task is scaling the sensor output into the converter's supported input range and validating offset, noise, and calibration errors across the intended temperature range.
Recommandé
Pressure Measurement Display
The ICL7126CPL+ is appropriate for a pressure-gauge or transducer readout because it combines measurement conversion and local display drive in one 40-pin PDIP. A pressure bridge or conditioned transmitter signal can be sampled at 3 conversions per second and shown on a three-digit LCD, which is adequate for slow pneumatic and hydraulic changes. Integrated decoders and drivers eliminate a separate display interface, while the monolithic converter provides a straightforward path from analog sensor signal to readable value. Input excitation, common-mode range, filtering, calibration, and LCD contrast remain application-specific design tasks.
Recommandé
Process Monitoring Indicator
The ICL7126CPL+ can serve as the front end of a process-monitoring indicator where a plant sensor is represented by a three-digit local display. Its low-power, single-chip integration is useful in compact panels that lack space for a separate converter and display driver, and the 3-SPS rate matches slowly changing process variables. The non-multiplexed LCD output is the relevant display interface for this application. Engineers must define electrical isolation or protection as needed, route the reference cleanly, and ensure that sensor settling time is compatible with the integration and conversion timing.
Recommandé
Battery-Powered Portable Instrument
The ICL7126CPL+ is suitable for a battery-powered portable meter because it is identified as a low-power converter and consolidates the reference, clock, and LCD drive functions into one monolithic device. A 3-SPS measurement rate avoids continuous high-rate sampling while retaining a live numerical display for resistance, voltage, or general sensor measurements. The 40-pin PDIP is easy to prototype and service on a through-hole instrument board. Battery life still requires a calculated budget using the current consumption for each operating mode, and the LCD, reference, and optional input-network losses must be included rather than evaluating only the converter core.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ICL7126CPL+ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ICL7126CPL | ICL7126CMZ | TC7126IPL | TC7126CPL | ICL7126CSZ |
|---|---|---|---|---|---|---|
| Package | 40-pin PDIP | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Microchip Technology | Microchip Technology | Analog Devices |
| ADC Type | Dual-slope ADC | Dual-slope ADC | Dual-slope ADC | Dual-slope CMOS ADC | Dual-slope CMOS ADC | Dual-slope ADC |
| Display Resolution | 3.5 digits | 3.5 digits | 3.5 digits | 3.5 digits | 3.5 digits | 3.5 digits |
| LCD Display Support | Non-multiplexed LCD with integrated segment drivers and decoders | Integrated segment drivers and decoders | Integrated segment drivers and decoders | Integrated segment drivers and decoders | 40-DIP panel-meter ADC | Integrated segment drivers and decoders |
Principaux différenciateurs
- Complete panel-meter integration (vs TC7126IPL)
- Verified 3-conversions-per-second operating rate (vs TC7126IPL)
- Direct support for non-multiplexed LCD displays (vs ICL7126CSZ)
- Very high input impedance measurement front end (vs TC7126CPL)
Notes de conception
Do not treat the integrated display drivers as permission to omit input-range and reference design. The verified ICL7126 data confirms a 3.5-digit, 3-SPS dual-slope converter with an internal reference and clock, but it does not provide the complete electrical limits in the supplied records. Before assembly, verify the current datasheet for input range, reference voltage, conversion timing, LCD outputs, and absolute maximum ratings. This is especially important when evaluating TC7126IPL or TC7126CPL as replacements, because a shared 40-pin package does not by itself prove identical pin behavior.
Route the analog input, reference connection, and sensitive timing components away from LCD segment outputs and switching-node wiring. Keep input traces short, use a continuous ground reference, and place the manufacturer's recommended input and reference capacitors close to their associated pins. The supplied information does not specify capacitance values, so component selection must follow the current ICL7126 application guidance rather than generic values. Confirm the LCD layout also because the ICL7126 is designed for a non-multiplexed display and segment mapping must match the actual glass.
Calculate the complete meter power budget rather than comparing only ADC core consumption. The 3-SPS conversion rate can reduce active measurement time, but the LCD, reference network, external input conditioning, and any status indicator also consume power. For a battery-powered instrument, use the current datasheet's operating-mode current figures to estimate average and peak demand. The provided data establishes low-power operation qualitatively but does not include a numeric current value, so a battery-life estimate based on an invented consumption figure would be unreliable.
Informations de conformité
The supplied verified results identify the ICL7126 as a production low-power 3.5-digit A/D converter but do not provide product-specific RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification statements.