Overview
The MAX138EPL+ is a 3 ½ digit analog-to-digital converter (ADC) produced by Analog Devices Inc./Maxim Integrated. This component is part of the MAX138/MAX139 family, which includes on-board LCD display drivers for the MAX138 and LED display drivers for the MAX139. The MAX138EPL+ operates with a single power supply voltage ranging from +2.5V to +7V, enabling it to measure both positive and negative input voltages.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Supply Voltage | Single supply voltage range | +2.5V to +7V |
| Input Voltage Range | Bipolar input voltage range | Positive and negative inputs |
| Display Type | On-board display driver | LCD (MAX138) |
| Resolution | Digit resolution | 3 ½ digits |
| Charge Pump | Voltage inverter | Generates negative supply voltage |
| Package Type | Package option for MAX138EPL+ | Plastic Dual-In-Line, Wide (0.6in) |
Key Features
- Operates from a single +2.5V to +7V power supply.
- Measures both positive and negative input voltages.
- Includes an on-board LCD display driver (for MAX138).
- Features a charge-pump voltage inverter to generate a negative supply voltage.
- Internal oscillator and external charge-pump capacitor.
- Direct LED drivers for display.
Applications
The MAX138EPL+ is suitable for various applications requiring precise voltage measurement and display. These include:
- Digital multimeters and voltmeters.
- Industrial control and monitoring systems.
- Medical instrumentation.
- Automotive and aerospace systems where bipolar voltage measurement is necessary.
Q & A
- What is the operating voltage range of the MAX138EPL+?
The MAX138EPL+ operates from a single power supply voltage ranging from +2.5V to +7V.
- Can the MAX138EPL+ measure both positive and negative input voltages?
Yes, the MAX138EPL+ can measure both positive and negative input voltages due to its charge-pump voltage inverter.
- What type of display does the MAX138EPL+ support?
The MAX138EPL+ supports an on-board LCD display driver.
- What is the resolution of the MAX138EPL+ ADC?
The MAX138EPL+ has a 3 ½ digit resolution.
- Does the MAX138EPL+ require an external power supply for the display?
No, the MAX138EPL+ does not require an external power supply for the display as it is driven directly by the ADC.
- What package type is available for the MAX138EPL+?
The MAX138EPL+ is available in a Plastic Dual-In-Line, Wide (0.6in) package.
- How does the charge-pump voltage inverter work in the MAX138EPL+?
The charge-pump voltage inverter generates a negative supply voltage from the single positive supply voltage, enabling the measurement of negative input voltages.
- What are some common applications of the MAX138EPL+?
Common applications include digital multimeters, industrial control systems, medical instrumentation, and automotive/aerospace systems.
- Does the MAX138EPL+ have an internal oscillator?
Yes, the MAX138EPL+ includes an internal oscillator.
- Is the MAX138EPL+ suitable for high-temperature environments?
The MAX138EPL+ is specified over a temperature range that makes it suitable for various environmental conditions, but specific temperature limits should be checked in the datasheet.
