AMC7908数据手册TI中文资料规格书

描述 Description

The AMC7908 is a highly integrated power-amplifier (PA) monitor and control device capable of temperature, current, and voltage supervision.

The AMC7908 bias controller is based around eight digital-to-analog converters (DAC) 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 AMC7908 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 AMC7908 an excellent choice as an all-in-one, bias control circuit for the power amplifiers found in RF communication systems. 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 accuracy

• 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: –40°C to +150°C