AMC7834 Datasheet, PDF (24/93 Pages) Texas Instruments – AMC7834 12-Bit Integrated Power-Amplifier Monitor and Control System with Temperature, Current and Voltage Supervision Capabilities

AMC7834
SLAS972B – NOVEMBER 2014 – REVISED MARCH 2016
7 Detailed Description
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7.1 Overview
The AMC7834 is a highly-integrated analog-monitoring and control solution for power-amplifier (PA) biasing
capable of current, temperature, and voltage supervision. The AMC7834 integrates the following features:
• Eight, 12-bit digital-to-analog converters (DACs) with programmable output ranges
– Four bipolar DACs with selectable output ranges: –4 to 1 V, –5 to 0 V, and 0 to 5 V
– The clamp and power-on-reset (POR) voltage for these DACs is pin-configurable.
– Four auxiliary DACs with selectable output ranges: 0 to 5 V and 2.5 to 7.5 V
– The clamp and POR voltage for these DACs is fixed to AGND.
– The DACs can be configured to clamp automatically upon detection of an alarm event.
• A multi-channel, 12-bit analog-to-digital converter (ADC) for voltage, temperature, and current sensing
– Four external analog inputs: 0 to 2.5 V
– Four internal inputs for monitoring the bipolar DAC outputs
– Programmable threshold detectors
• Four high-side current-sense amplifiers
– Common mode voltages from 4 V up to 60 V
– The current sensors can optionally be set to operate as part of four independent closed-loop drain-current
controllers
• Temperature sensing capabilities
– On-chip temperature sensor
– Two remote temperature sensor diode drivers
• Four general-purpose I/O (GPIO) ports
• Internal 2.5 V precision reference
– The device can operate from an internal reference. Alternatively an external reference can be used.
• Four-wire SPI-compatible interface supporting 1.7 to 3.6 V operation
The AMC7834 device is characterized for operation over the temperature range of –40ºC to 125ºC which makes
the device suitable for harsh-condition applications. The device is available in an 8-mm × 8-mm 56-pin VQFN
PowerPAD package.
The AMC7834 high-integration makes it an ideal all-in-one, low-cost, bias-control circuit for the PAs found in
multi-channel RF communication systems. The flexible DAC output ranges allow the device to be used as a
biasing solution for a large variety of transistor technologies such as LDMOS, GaAs, and GaN. The AMC7834
feature set is similarly beneficial in general-purpose monitor and control systems.
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