MAX139CPL+ - 3.5-Digit ADC with LED Drivers | Analog Devices
MPN： MAX139CPL+ ✓ 啟用中MAX139CPL+ 概覽
An ADC converts an analog input voltage into a numeric value for measurement, display, or control. The MAX139 belongs to the dual-slope ADC family within the broader ADC/DAC and integrated-circuit hierarchy. Dual-slope conversion is useful when stable, repeatable readings are more important than very high conversion speed, particularly in panel meters where input noise and reference accuracy directly affect the displayed result.
Key features include 3.5-digit resolution, an internal reference, an integrated charge pump, and direct LED drivers. The direct-driver outputs reduce the external circuitry needed to illuminate a multiplexed or segmented numeric display. Operating from +2.5V to +7V also allows the converter to fit systems that cannot provide the higher supply voltage associated with many older display-driver designs. The device accepts bipolar input signals, supporting measurement systems in which the sensed voltage may cross a defined midpoint.
The architecture combines a dual-slope conversion process with the MAX139 family’s integrated display support. Its internal reference and charge pump support the converter’s measurement and display functions, while the direct LED-driver outputs are intended to reduce system complexity. The Analog Devices product page identifies the MAX139 as a production device and lists a Data Sheet, Rev. 2, together with a product-selection table for family members.
Typical uses include digital panel meters, laboratory and bench instrumentation, industrial process readouts, laboratory equipment, weighing or counting displays, and compact embedded measurement panels. The combination of a 2.5V-to-7V supply range and direct LED drivers is especially useful where a numeric indication must be produced without a separate display-driver IC.
When designing a new board, verify the complete pinout, recommended input and reference network, LED current limits, bypass-capacitor requirements, and maximum input conditions against the manufacturer data sheet before layout is released. MAX139CPL+, MAX139CPL, and MAX139EPL-family variants use the same 40-pin PDIP format, but temperature grade, lead-free status, and electrical details must be checked rather than inferred from the suffix.
This page consolidates verified manufacturer and distributor information, package details, pricing, family alternatives, and application guidance. It adds selection context beyond a distributor listing while clearly identifying parameter values that still require confirmation from the manufacturer documentation.
直接替換替代品，適用於 MAX139CPL+ — 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。
MAX139EPL+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX139EPL
✅ 直接替換📋 參考替代品（不在目錄中）
MAX139CPL
✅ 直接替換📋 參考替代品（不在目錄中）
MAX139CPL+ 最大額定值與電氣特性
| ADC Resolution | 3.5 digits |
| Conversion Architecture | Dual-slope ADC |
| Number of ADC Channels | 1 channel |
| 工作電源電壓 | +2.5V to +7V |
| Input Signal Type | Bipolar input |
| Internal Reference | Integrated |
| Charge Pump | Integrated |
| Display Output | Direct LED drivers |
| Package Type | PDIP-40 |
| 腳位數 | 40 pins |
| Package Dimensions | 0.600 in (15.24 mm) wide |
| 安裝方式 | Through-hole |
| Temperature Grade | Commercial |
| Manufacturer Document Revision | Data Sheet Rev. 2 |
MAX139CPL+ 0.600 in (15.24 mm) wide 腳位配置指南
MAX139CPL+（0.600 in (15.24 mm) wide 封裝）的腳位配置。 此功率元件具有閘極、汲極與源極端子。對於非極性封裝，請參閱製造商資料表以取得確切的第 1 腳方向與佈局詳細資訊。常見應用包括電源設計、馬達驅動與負載切換。
無詳細腳位定義資料： MAX139CPL+.
請參閱 資料表 以查看完整腳位配置。
典型應用
MAX139CPL+ 適用於 6 應用s: Digital Panel Meters, Laboratory Bench Instrumentation, Industrial Process Readouts, Laboratory Equipment Counters, Precision Weighing Displays, Embedded Measurement Displays.
Digital Panel Meters
The MAX139CPL+ fits digital panel meters because it combines a 3.5-digit dual-slope ADC with direct LED drivers in one 40-pin PDIP device. Its one-channel measurement architecture and +2.5V-to-+7V operating range suit compact displays that must present a measured voltage, current, or resistance value without a separate display-driver IC. The internal reference and charge pump also reduce the number of supporting functions an instrument must provide. During design, verify the permitted input network, LED current limits, conversion timing, and display multiplexing arrangement against Data Sheet, Rev. 2. The commercial temperature-grade classification must also fall within the enclosure’s expected temperature range.
推薦
Laboratory Bench Instrumentation
The MAX139CPL+ is appropriate for laboratory bench instruments that use a stable numeric readout rather than rapid waveform acquisition. Its dual-slope, 3.5-digit architecture supports repeatable panel-style measurements, while the integrated reference, charge pump, and direct LED drivers can simplify the display path. The single +2.5V-to-+7V supply range permits use with common low-voltage analog systems and reduces the need for a more complex power arrangement. Designers should confirm input accuracy, conversion time, and LED-drive limits in the official data sheet because those values were not included in the verified search extract. A stable reference layout and suitable grounding remain essential for credible instrument readings.
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Industrial Process Readouts
The MAX139CPL+ can support industrial process-readout equipment when the process signal can be conditioned into the converter’s permitted bipolar input range and the commercial-grade temperature classification meets the installation conditions. Its 3.5-digit dual-slope measurement system and direct LED drivers are useful for local temperature, pressure, position, or level indications. The +2.5V-to-+7V supply range is compatible with embedded 5V systems, while the 40-pin PDIP format supports through-hole assembly. Engineers must verify the complete electrical limits, input conditioning, settling requirements, and reference accuracy before design release. If the operating environment exceeds the commercial-grade range, the E-grade family options should be investigated instead.
推薦
Laboratory Equipment Counters
The MAX139CPL+ is suitable for counting and classification equipment that needs a readable three-and-a-half-digit result rather than a high-speed data-conversion stream. The dual-slope conversion method, one measurement channel, integrated reference, and direct LED drivers provide the core functions required for a simple counter or totalizer. Its single +2.5V-to-+7V supply supports integration into compact laboratory apparatus and reduces regulator complexity. The key engineering tradeoff is measurement speed: the converter is intended for displayed values rather than continuous high-rate sampling. Confirm conversion time, input filtering, display refresh requirements, and segment-drive current in the manufacturer documentation before selecting external resistors and indicator components.
推薦
Precision Weighing Displays
The MAX139CPL+ can form the measurement and display core of a compact weighing indicator because it provides a 3.5-digit result, integrated reference, charge pump, and direct LED drivers. The bipolar-input capability is useful when a load-cell or bridge signal is conditioned around a midpoint, while the +2.5V-to-+7V supply range suits low-voltage embedded systems. Direct LED-drive outputs can reduce the component count needed for a segmented numeric display. Accuracy still depends on the external analog front end, reference accuracy, layout, and system calibration rather than the converter alone. Verify the specified input ranges, sampling behavior, and settling time against the official data sheet before assigning production tolerances.
推薦
Embedded Measurement Displays
The MAX139CPL+ is well matched to embedded instruments that require a local numeric measurement and LED indication from a low-voltage supply. Its one-channel dual-slope ADC, 3.5-digit resolution, internal reference, charge pump, and direct LED drivers consolidate several functions into a single 40-pin PDIP. This is useful in compact test fixtures, environmental monitors, and service equipment where a numerical indication is more useful than a high-bandwidth data stream. The designer should preserve clean input grounding, follow the manufacturer bypass-capacitor recommendations, and verify that the display current and refresh timing suit the chosen LEDs. Commercial-grade limits must be checked against the enclosure temperature, while regulated industrial environments may justify evaluating the E-grade alternatives.
推薦
推薦產品摘要
工程參考資料，適用於 MAX139CPL+ — 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 | MAX139EPL+ | MAX139EPL | MAX139CPL |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | PDIP-40 | PDIP-40 | PDIP-40 | PDIP-40 |
| ADC Resolution | 3.5 digits | 3.5 digits | 3.5 digits | 3.5 digits |
| Conversion Architecture | Dual-slope | Dual-slope | Dual-slope | Dual-slope |
| Number of ADC Channels | 1 channel | 1 channel | 1 channel | 1 channel |
| Operating Supply Voltage | +2.5V to +7V | +2.5V to +7V | +2.5V to +7V | +2.5V to +7V |
| Display Drive | Direct LED drivers | Direct LED drivers | Direct LED drivers | Direct LED drivers |
| Lead-Finish Suffix | + suffix present | + suffix present | + suffix absent | + suffix absent |
主要差異化特點
- Integrated measurement and display functions (對比MAX139EPL+)
- Pin-compatible 40-pin PDIP footprint (對比MAX139CPL)
- Commercial-grade ordering option (對比MAX139EPL+)
設計說明
Follow the manufacturer’s recommended input, reference, supply, and bypass-capacitor placement exactly. Because this is a precision dual-slope measurement device, long input traces and poorly decoupled supply paths can introduce errors that are not apparent from the 3.5-digit resolution alone. Keep the measurement input away from LED-drive and charge-pump switching nodes, use a compact ground return for the analog section, and verify that the selected package’s 40-pin PDIP footprint matches the schematic before fabrication.
Do not treat MAX139CPL, MAX139EPL, MAX139EPL+, and MAX139CPL+ as identical without checking the ordering information. The verified comparison data shows the same 40-pin PDIP architecture and major conversion characteristics, but the E/C grade and plus-suffix distinctions affect temperature classification or lead condition. Review absolute-maximum ratings, operating temperature, lead-free status, and any changed electrical limit for the exact replacement before approving it for production.
The MAX139CPL+ operates from +2.5V to +7V, but that range does not remove the need for local supply decoupling. Place the manufacturer-recommended bypass capacitors close to their designated pins and keep supply routing away from sensitive analog inputs. Confirm the actual rail voltage, startup sequence, and display-drive current requirement for the selected board. If the display consumes significant current, verify that supply droop does not disturb the measurement and reference networks.
Separate the measurement path from the direct LED-drive outputs and the internal charge-pump activity as far as the through-hole layout permits. Use a compact analog ground region around the converter and route display-current returns away from reference and input connections. These measures help prevent display transitions and charge-pump coupling from becoming visible in the final reading. The exact reference, input, and bypass topology must be taken from Analog Devices Data Sheet, Rev. 2.
合規資訊
The verified data identifies a + suffix ordering code but does not explicitly state the lead-free, RoHS, REACH, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred. AEC-Q100 is not applicable because this is not identified as an automotive-qualified device.
