AMC7834 datasheet(24/97 Pages) TI2

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AMC7834

SLAS972B – NOVEMBER 2014 – REVISED MARCH 2016

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7 Detailed Description

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:

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Eight, 12-bit digital-to-analog converters (DACs) with programmable output ranges

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Four bipolar DACs with selectable output ranges: –4 to 1 V, –5 to 0 V, and 0 to 5 V

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The clamp and power-on-reset (POR) voltage for these DACs is pin-configurable.

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Four auxiliary DACs with selectable output ranges: 0 to 5 V and 2.5 to 7.5 V

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The clamp and POR voltage for these DACs is fixed to AGND.

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The DACs can be configured to clamp automatically upon detection of an alarm event.

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A multi-channel, 12-bit analog-to-digital converter (ADC) for voltage, temperature, and current sensing

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Four external analog inputs: 0 to 2.5 V

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Four internal inputs for monitoring the bipolar DAC outputs

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Programmable threshold detectors

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Four high-side current-sense amplifiers

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Common mode voltages from 4 V up to 60 V

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The current sensors can optionally be set to operate as part of four independent closed-loop drain-current

controllers

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Temperature sensing capabilities

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On-chip temperature sensor

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Two remote temperature sensor diode drivers

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Four general-purpose I/O (GPIO) ports

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Internal 2.5 V precision reference

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The device can operate from an internal reference. Alternatively an external reference can be used.

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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.

AMC7834 Datasheet(PDF) 24 Page - Texas Instruments

AMC7834 Datasheet(HTML) 24 Page - Texas Instruments

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