MAX140CMH+ - 3.5-Digit ADC with LED Drivers | Maxim
Référence : MAX140CMH+ ✓ ActifMAX140CMH+ Présentation
A special-purpose A/D converter converts continuously varying analog quantities into a numeric value for measurement, display, or control. The MAX140 family sits between general-purpose ADCs and application-specific display-driver ICs: it combines measurement, reference generation, positive supply generation, and seven-segment display excitation rather than requiring each function as a separate device.
According to the Analog Devices MAX140 product page, the key headline specifications are the 3.5-digit conversion format, a single +2.5 V to +7 V supply range, and direct LED-driver outputs. The integrated bandgap reference establishes the conversion reference, while the charge-pump converter generates the voltage required by the display drivers. Direct LED-drive capability can simplify instrument-panel and digital-panel-meter designs by reducing the number of external display-driver circuits.
The MAX140CMH+ uses a dual-slope conversion architecture, which is suited to metering applications that emphasize stable readings rather than high-speed sampling. The verified distributor listings classify it as a single-channel ADC with parallel word access and CMOS technology. Its 44-MQFP package provides 44 external terminals in a 10 mm by 10 mm surface-mount footprint.
Typical applications include digital panel meters, weighing scales, temperature indicators, industrial process readouts, laboratory instrumentation, and compact laboratory instruments. Because the part combines measurement, reference, charge-pump, and display functions, board designers can simplify designs that otherwise require separate display-driver and voltage-generation circuitry.
When laying out the MAX140CMH+, keep the analog input path away from the LED-driver and charge-pump outputs, provide stable bypassing at the supply pins, and verify that the chosen display operating current stays within the device's LED-drive limits. The provided web data does not enumerate the complete pin functions, so the pin assignment should be confirmed against the MAX140 datasheet before layout release.
This page consolidates verified manufacturer and distributor information, package details, sourcing observations, and drop-in alternatives for the MAX140CMH+. It also separates verified electrical facts from parameters that still require confirmation from the full manufacturer datasheet, helping engineers qualify the part without relying on unverified repackaging assumptions.
Alternatives de remplacement direct pour MAX140CMH+ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
MAX140CMH+TD
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX140CMH+D
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX140CMH+C10165
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX140CMH+ Valeurs maximales et caractéristiques électriques
| Fonction | 3.5-digit A/D converter with bandgap reference, charge-pump voltage converter, and direct LED drivers |
| Conversion Architecture | Dual slope |
| Conversion Resolution | 3.5 decimal digits |
| Number of Channels | 1 channel |
| Supply Voltage Range | +2.5 V to +7 V |
| Input Signal Type | Bipolar input |
| Output Interface | Parallel word access |
| Integrated Reference | 1 internal bandgap reference |
| Charge-Pump Converter | 1 internal charge-pump voltage converter |
| Display Driver | Direct LED drivers |
| Boîtier | 44-MQFP, 10 mm x 10 mm |
| Number of Terminals | 44 terminals |
| Type de montage | Surface mount |
| Technology | CMOS |
| Temperature Grade | Commercial |
| Production Status | Production |
| Automotive Qualification | Not indicated in the provided verified web data |
Guide de configuration des broches du MAX140CMH+ 44-mqfp, 10 mm x 10 mm
Configuration des broches du MAX140CMH+ (boîtier 44-mqfp, 10 mm x 10 mm). Ce composant de puissance comporte des bornes de grille, de drain et de source. Pour les boîtiers non polarisés, consultez la fiche technique du fabricant pour l'orientation exacte de la broche 1 et les détails de l'empreinte. Les applications courantes incluent la conception d'alimentations, la commande de moteurs et la commutation de charges.
Aucune donnée de brochage détaillée disponible pour MAX140CMH+.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
MAX140CMH+ convient pour 6 applications: Digital Panel Meters, Industrial Process Readouts, Weighing Scale Displays, Temperature Indicator Instruments, Laboratory Handheld Meters, Embedded Control Panel Displays.
Digital Panel Meters
The MAX140CMH+ fits digital panel meters because it combines a 3.5-digit measurement channel, a bandgap reference, a charge-pump converter, and direct LED drivers in one 44-MQFP package. Its single +2.5 V to +7 V supply range allows the meter to operate from one rail rather than requiring separate analog and display-support supplies. The direct-driver architecture can also reduce board area compared with a design that uses a separate display-driver IC. Before layout, confirm the display current, digit count, multiplexing requirements, and complete pin assignments from the manufacturer datasheet.
Recommandé
Industrial Process Readouts
The MAX140CMH+ is suitable for compact industrial process readouts where a bipolar sensor signal must be converted into a three-and-a-half-digit display value. The integrated bandgap reference provides the measurement reference, while the dual-slope architecture targets stable meter readings rather than high-rate waveform acquisition. Operation from a single +2.5 V to +7 V supply supports both low-voltage portable instruments and conventional control-panel electronics. Provide effective supply bypassing and keep the analog input routing separated from the LED and charge-pump outputs to preserve measurement quality.
Recommandé
Weighing Scale Displays
A weighing-scale display benefits from the MAX140CMH+ because it combines the front-end measurement function with direct seven-segment LED excitation and an internal reference. The 3.5-digit format is appropriate for displaying load cells or instrumented amplifier outputs with sufficient resolution for commercial weighing equipment. The single +2.5 V to +7 V operating range supports compact bench and portable scale designs. Use shielded analog routing, a stable reference arrangement, and the manufacturer's recommended input filtering to prevent LED-driver transients from degrading the displayed weight.
Recommandé
Temperature Indicator Instruments
The MAX140CMH+ can serve as the display front end in a temperature-indicator instrument because it accepts bipolar analog inputs, includes a bandgap reference, and provides direct LED-drive outputs. This integration supports a straightforward architecture in which a conditioned sensor or bridge amplifier feeds the ADC and the resulting digits drive the display. The single +2.5 V to +7 V supply range simplifies low-voltage instrument design. Accuracy beyond the basic 3.5-digit conversion function depends on the external sensor interface, reference behavior, and filtering, which must be verified from the full datasheet.
Recommandé
Laboratory Handheld Meters
The MAX140CMH+ is well matched to handheld laboratory meters that need local numerical readout without a communications interface. Its 3.5-digit converter, integrated reference, charge-pump converter, and direct LED drivers reduce the number of support circuits in a compact instrument. The +2.5 V to +7 V single-supply range is appropriate for battery-operated equipment using an internal step-up stage or a compatible single-rail source. Design the analog input connector and display drive current for low power, and verify the exact LED-drive limits before selecting series resistors.
Recommandé
Embedded Control Panel Displays
The MAX140CMH+ can provide a dedicated local display in an embedded control panel when a 3.5-digit bipolar measurement and direct LED drive are sufficient. Integrating the reference, charge pump, and display drivers leaves the host controller free to manage menus, logging, or system supervision rather than multiplex the display. Because the device accepts bipolar inputs, the signal-conditioning stage must translate the sensor output into the expected input range. Confirm startup behavior, display multiplexing, and blanking requirements against the manufacturer documentation before integrating it with an existing platform.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX140CMH+ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX140CMH+TD | MAX140CMH+D | MAX140CMH+C10165 |
|---|---|---|---|---|
| Package | 44-MQFP (10x10) | 44-MQFP (10x10) - same package class | 44-QFP - same 44-terminal package class | 44-MQFP (10x10) - same package |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Conversion Format | 3.5-digit ADC | 3.5-digit ADC | 3.5-digit dual-slope ADC | 3.5-digit ADC |
| Integrated Functions | Bandgap reference, charge pump, and direct LED drivers | Reference, charge pump, and direct LED drivers | MAX140 family display-driver ADC | Display driver with 3.5-digit ADC |
| Lifecycle Status | Active / production | Active | Active | Active |
Principaux différenciateurs
- Combines metering and display functions (vs MAX140CMH+TD)
- Commercial-grade production status in the MAX140 family (vs MAX140EPL+)
- Direct LED-drive integration reduces external circuitry (vs MAX140CMH+C10165)
Notes de conception
Route the bipolar analog input as a short, guarded trace away from the LED-driver and charge-pump pins. These outputs are capable of producing fast transitions that can couple into a high-impedance measurement node. A solid ground plane, a quiet analog return path, and the shortest practical connection between the source and input pins are more important than elaborate external filtering on this highly integrated meter device.
Place the supply-bypass capacitors immediately across the relevant +2.5 V to +7 V supply and ground pins, with the shortest possible return to the device ground reference. The MAX140 integrates a charge pump, so supply current contains converter and LED-drive activity even when the ADC input is stable. Validate the bypass network against the manufacturer's recommended layout and confirm that display operating current does not pull the supply outside its permitted range.
Do not treat every MAX140 ordering suffix as automatically interchangeable without checking the full ordering table. The verified sources identify MAX140CMH+TD, MAX140CMH+D, and MAX140CMH+C10165 in 44-terminal QFP-class packages, but they do not publish complete pin maps or temperature ranges for every suffix. Compare the schematic, package drawing, pin table, lifecycle status, and delivery code before treating a substitution as production-approved.
Informations de conformité
The supplied verified excerpts do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. The Xecor comparison identifies the MAX140 as EAR99 and not automotive, so AEC-Q100 is treated as not applicable to this commercial-grade device.
