Overview
The MAX138EQH, produced by Analog Devices Inc./Maxim Integrated, is a sophisticated integrated circuit designed for specific control and measurement tasks. This component is part of the MAX138 series, which is primarily used for RF LDMOS bias control in various applications, including cellular base stations and industrial process control. The MAX138EQH integrates multiple functions such as high-side current sensing, temperature measurement, and gate-bias voltage control, making it a versatile and efficient solution for complex systems.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage (Analog) | 4.75V to 5.25V |
| Supply Voltage (Digital) | 2.7V to 5.25V |
| Gate-Drive Supply Voltage | 4.75V to 11.0V |
| Analog Supply Current | 3.2mA |
| Digital Supply Current | 3.1mA |
| Gate-Drive Supply Current | 4.5mA |
| Operating Temperature Range | -40°C to +85°C |
| Package Type | 48-pin thin QFN |
| Serial Interface | I²C/SPI-compatible |
| Current Sense Amplifier Gain | 2, 10, or 25 |
| Gate-Bias Voltage Range | 0 to 5V, 0 to 10V |
Key Features
- Integrated high-side current-sense PGA with gains of 2, 10, or 25
- ±0.5% accuracy for sense voltage between 75mV and 250mV
- Adjustable low noise 0 to 5V, 0 to 10V output gate-bias voltage ranges with ±10mA gate drive
- Fast clamp to 0V for LDMOS protection
- 8-bit DAC control of gate-bias voltage and 10-bit DAC control of gate-bias offset with temperature
- Internal die temperature measurement and external temperature measurement by diode-connected transistor
- Internal 12-bit ADC for temperature, current, and voltage measurements
- Selectable I²C-/SPI-compatible serial interface with speeds up to 16MHz
Applications
- RF LDMOS bias control in cellular base stations
- Industrial process control
Q & A
- What is the primary function of the MAX138EQH?
The MAX138EQH is primarily used for RF LDMOS bias control and includes features such as high-side current sensing, temperature measurement, and gate-bias voltage control. - What are the supply voltage ranges for the MAX138EQH?
The MAX138EQH operates from a 4.75V to 5.25V analog supply, a 2.7V to 5.25V digital supply, and a 4.75V to 11.0V gate-drive supply. - What types of serial interfaces does the MAX138EQH support?
The MAX138EQH supports I²C and SPI serial interfaces with speeds up to 16MHz. - What is the accuracy of the current sense amplifier in the MAX138EQH?
The current sense amplifier has an accuracy of ±0.5% for sense voltages between 75mV and 250mV. - What is the operating temperature range of the MAX138EQH?
The operating temperature range is -40°C to +85°C. - What package type is the MAX138EQH available in?
The MAX138EQH is available in a 48-pin thin QFN package. - Does the MAX138EQH have internal temperature measurement capabilities?
Yes, the MAX138EQH includes internal die temperature measurement and external temperature measurement by a diode-connected transistor. - What is the resolution of the gate-bias voltage control in the MAX138EQH?
The gate-bias voltage control uses 8-bit coarse and 10-bit fine DACs, providing up to 18 bits of resolution. - Does the MAX138EQH support power-saving features?
While specific power-saving modes are not detailed for the MAX138EQH, it is designed to be efficient with its supply currents. - What are some common applications of the MAX138EQH?
Common applications include RF LDMOS bias control in cellular base stations and industrial process control.
