AFE20408中文资料具有输出开关和电流传感器的八通道功率放大器监视器和控制器数据手册TI规格书

描述 Description

The AFE20408 is a highly integrated power-amplifier (PA) monitor and control device capable of temperature, current, and voltage supervision.

The AFE20408 bias controller is based around eight digital-to-analog converters (DACs) with programmable output ranges. The eight gate bias outputs are switched on and off through dedicated control pins. The gate bias switches are designed for fast response and enable correct power sequencing and protection of depletion-mode transistors, such as GaAs and GaN.

The AFE20408 supervisor is based around an accurate multichannel analog-to-digital converter (ADC). The device integrates two high-voltage inputs, two high-side current-sense amplifiers and an accurate on-chip temperature sensor.

The function integration and wide operating temperature range make the AFE20408 an excellent choice as an all-in-one, bias control circuit for power amplifiers. The flexible DAC output ranges and built-in sequencing features let the device be used as a biasing controller for a large variety of transistor technologies, such as LDMOS, GaAs, and GaN.

特性 Features

Eight analog outputs

Eight monotonic DACs: 1.22mV resolution

Automatically configured output ranges:

Positive output voltage: 0V to 10V

Negative output voltage: –10V to 0V



High current drive capability

High capacitive load tolerance



Output on and off control switches

Fast switching time

Low resistance



Multichannel ADC monitor

Two high-voltage external inputs: 0V to 85V

Two high-side current-sense amplifiers: up to 85V common mode range

Local temperature sensor: ±2.5°C error



Output sequence control for start-up and shutdown events

Internal 2.5V reference

SPI and I2C interface: 1.65V to 3.6V operation

SPI: 4-wire interface

I2C: 16 target addresses



Specified temperature range: –40°C to +125°C

Operating temperature range –55°C to +150°C