MAX139EPL+ - 3.5-Digit Dual-Slope ADC | Analog Devices
Артикул: MAX139EPL+ ✓ АктивенMAX139EPL+ Обзор
A special-purpose ADC is an integrated circuit optimized for a measurement function rather than general-purpose high-speed conversion. The MAX139EPL+ belongs to the ADC and DAC hierarchy and uses the dual-slope conversion technique, in which an unknown input is integrated over a defined interval and compared with a reference ramp. This approach is particularly useful for panel-meter and display-controller designs where moderate resolution, reference stability, and direct display excitation are more important than rapid sampling.
The MAX139 integrates a bandgap reference and a charge-pump voltage converter, reducing the number of external precision components needed in suitable instrumentation. Its direct LED drivers support multiplexed numeric displays, while its 3.5-digit resolution represents readings with an effective digit count commonly used for analog panel meters. The 2.5V to 7V single-supply range accommodates both low-voltage logic-oriented systems and conventional industrial supply environments.
According to the Analog Devices MAX139 data sheet, Rev. 2, the MAX139 is a production device with direct LED display drivers. The product is also described as a dual-slope ADC with bandgap reference and charge-pump functions. The two-channel description supplied with the verified distributor data distinguishes the device from the single-channel MAX139CPL+, although their shared 40-pin PDIP package allows the MAX139CPL+ to serve as a candidate replacement when its detailed electrical requirements are confirmed.
Typical uses include digital panel meters, process-monitoring equipment, laboratory instrumentation, temperature display instruments, and industrial control panels. The MAX139EPL+ is most appropriate where an engineer wants a dedicated display-oriented ADC with integrated drive functions rather than a high-speed general-purpose converter. It can also be used as the measurement and display front end in equipment requiring bipolar input measurement.
A key design consideration is verifying the exact LED drive topology, digit and segment connections, input range, and reference configuration before layout. Because the verified product data does not expose the complete numbered pin map, engineers should use the manufacturer's pin configuration before making a PCB or direct replacement. Do not treat the 40-pin package alone as proof of complete functional equivalence.
This page combines verified manufacturer and distributor information, price context, package details, application guidance, and an independently sourced same-family replacement candidate. It also distinguishes verified facts from electrical details that still require confirmation in the manufacturer data sheet, helping engineers reduce sourcing and redesign risk without presenting unverified specifications as guaranteed.
Аналоги без доработки для MAX139EPL+ — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с MAX139EPL+ (тот же форм-фактор и посадочное место) — отличается по Temperature Grade.
MAX139CPL+
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Открыть даташит →MAX139EPL+ Максимальные параметры и электрические характеристики
| ADC Type | Dual-slope ADC |
| Разрешение | 3.5 digits |
| Number of Channels | 2 channels |
| Supply Voltage Range | +2.5V to +7V |
| Supply Type | Single supply |
| Input Capability | Bipolar inputs |
| Integrated Reference | Bandgap reference |
| Voltage Converter | Integrated charge-pump voltage converter |
| Display Drive | Direct LED display drivers |
| Диапазон рабочих температур | -40°C to +85°C |
| Temperature Grade | Industrial |
| Корпус | 40-pin PDIP, 0.600 inch (15.24mm) body width |
| Тип монтажа | Through-hole |
| Terminal Count | 40 terminals |
| Package Shape | Rectangular PDIP |
| Статус жизненного цикла | Active production |
Руководство по цоколевке MAX139EPL+ в корпусе rectangular pdip
Цоколевка для MAX139EPL+ (корпус rectangular pdip). Этот аналоговый компонент имеет выводы входа, выхода и питания. Обратитесь к техническому описанию производителя для конфигураций выводов балансировки нуля, коррекции и разрешения. Идеально подходит для схем обработки сигналов и усилителей.
Нет подробных данных о распиновке для MAX139EPL+.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
MAX139EPL+ подходит для 6 применениеs: Digital Process Panel Meters, Temperature Monitoring Instruments, Laboratory Measurement Displays, Industrial Control Panel Readouts, Bipolar Voltage Measurement Front Ends, Process Monitoring Equipment.
Digital Process Panel Meters
MAX139EPL+ fits digital process-meter front ends that require a 3.5-digit measurement and a direct numeric display. Its dual-slope ADC architecture, integrated bandgap reference, charge-pump voltage converter, and direct LED drivers reduce the number of separate display-driver and precision-reference blocks. The single 2.5V-to-7V supply also simplifies systems operating from either low-voltage logic or an industrial rail. Because the device is specified from -40°C to +85°C, it is well matched to factory instrumentation. Engineers should confirm the exact analog-input range, segment and digit assignment, and calibration flow before finalizing the panel PCB.
Temperature Monitoring Instruments
A temperature display instrument can use MAX139EPL+ as the dedicated conversion and display front end for a resistive, thermocouple-conditioned, or other bipolar sensor signal. The 3.5-digit format is appropriate for panel-style temperature readings, while the integrated reference and charge-pump functions can support a compact analog measurement section. Direct LED drivers simplify digit and segment excitation when the instrument uses multiplexed displays. For laboratory or industrial thermal equipment, the -40°C-to-85°C device rating is relevant, but sensor linearity, cold-junction compensation, input protection, and display refresh behavior must be evaluated independently of the ADC data sheet.
Laboratory Measurement Displays
MAX139EPL+ is suitable for compact laboratory instruments that need a stable numerical readout rather than a rapid data stream. Its dual-slope conversion approach, integrated bandgap reference, and direct LED display drivers provide a focused instrument-building block for bench meters and measurement panels. The 2.5V-to-7V supply range supports multiple source configurations, and the 40-pin PDIP is practical for through-hole prototypes. Designers should verify input impedance, conversion timing, input overvoltage behavior, and whether the display requires multiplexed common-anode or common-cathode LED arrangements. Calibration constants and reference accuracy should be established before production use.
Industrial Control Panel Readouts
For industrial control panels, MAX139EPL+ can combine analog measurement with direct seven-segment LED excitation, reducing the component count associated with separate display drivers. Its 3.5-digit dual-slope converter is appropriate for process values where readable resolution and stable references matter more than high-speed sampling. The single-supply operation from 2.5V to 7V and the -40°C-to-85°C rating support many industrial environments. Layout must isolate display-drive currents from sensitive analog routing, and engineers should confirm available LED drive current and segment patterns in the manufacturer data sheet. Input conditioning and surge protection remain essential when the panel is connected to field wiring.
Bipolar Voltage Measurement Front Ends
MAX139EPL+ can serve as the conversion and readout section of a bipolar measurement front end because the manufacturer identifies bipolar input acceptance as a key capability. This is useful in bench instruments and industrial indicators that must present signed or referenced readings on a numeric display. The integrated bandgap reference and charge-pump voltage converter can simplify support circuitry, but they do not eliminate the need to scale the sensor signal into the supported input range. Input protection, filtering, common-mode limits, and zero calibration must be validated. The two-channel description should also be reconciled with the measurement architecture before the component is assigned to a particular analog input.
Process Monitoring Equipment
MAX139EPL+ is well suited to process-monitoring equipment that requires a dedicated analog-to-digital front end and direct display control. Its 3.5-digit dual-slope conversion, integrated reference, and LED-driver outputs align with compact pressure, flow, level, or environmental indicators. The through-hole 40-pin PDIP package is useful for prototypes and serviceable industrial products, while the 2.5V-to-7V supply range permits integration with common embedded control systems. Engineers should account for display multiplexing, input settling time, sensor excitation requirements, and production calibration. It is less appropriate where high-rate sampling, simultaneous simultaneous-channel acquisition, or a digital data interface is required.
Справочные инженерные данные для MAX139EPL+ — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | MAX139CPL+ |
|---|---|---|
| Package | 40-pin PDIP (0.600 inch, 15.24mm) | 40-pin PDIP (0.600 inch, 15.24mm) - same |
| Brand | Analog Devices | Analog Devices |
| ADC Architecture | Dual-slope | Dual-slope |
| Resolution | 3.5 digits | 3.5 digits |
| Number of Channels | 2 channels | 1 channel |
| Supply Voltage Range | +2.5V to +7V | +2.5V to +7V |
| Display Drive | Direct LED display drivers | Direct LED display drivers |
| Integrated Reference | Bandgap reference | Bandgap reference |
| Mounting Type | Through-hole | Through-hole |
Ключевые отличия
- Two-channel measurement configuration (против MAX139CPL+)
- Same-footprint substitution potential (против MAX139CPL+)
- Identical headline conversion and supply ratings (против MAX139CPL+)
- Integrated display and precision functions (против MAX139CPL+)
Заметки по проектированию
Route the analog input and reference connections away from LED digit and segment outputs, especially because display-drive currents can create ground disturbances in sensitive measurement circuits. Use a quiet analog ground region and provide a short return path for display current. Confirm the exposed pin functions in the manufacturer drawing before assigning decoupling or protection networks. The verified sources establish the 40-pin PDIP footprint but do not provide the complete pin map, so footprint matching alone is not sufficient to validate a layout.
Decouple the single supply close to the device using the capacitance and voltage ratings specified by Analog Devices. Keep charge-pump and LED-driver return currents from sharing sensitive analog paths where practical. The MAX139EPL+ accepts a 2.5V-to-7V supply, but the usable margin at 2.5V must be checked against the internal reference, display-drive, and external-component requirements. Do not substitute a supply solely by voltage rating; ripple and startup behavior also affect displayed measurement stability.
Do not treat the shared 40-pin PDIP package of MAX139CPL+ and MAX139EPL+ as proof of identical operation. MAX139EPL+ is listed as a two-channel device, while MAX139CPL+ is listed as a single-channel device. Before substitution, compare analog-input assignments, LED-drive pins, reference accuracy, conversion behavior, calibration constants, and startup requirements using the official data sheets. Also verify whether the unused MAX139EPL+ channel is required by the PCB for sensing, diagnostics, or grounding.
Информация о соответствии
The supplied manufacturer and distributor snippets do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. The device is described as an industrial-temperature ADC rather than an automotive-qualified product, so AEC-Q100 is not applicable based on the available data.
