AFE032 datasheet(17/77 Pages) TI1

17 / 77 page

Inside the Device

Power Amplifier

TSENSE

PA_IN

PA_VS1,

PA_VS2,

PA_VS3

PA_ISET

PA_OUT1,

PA_OUT2

PA_GND1,

PA_GND2,

PA_GND3

17 k:

AFE032

www.ti.com

SBOS669A – AUGUST 2013 – REVISED DECEMBER 2013

APPLICATION INFORMATION

GENERAL DESCRIPTION

The AFE032 is an integrated, power-line communication, analog front-end device that functions in conjunction

with a microcontroller. The device conditions data generated in a microcontroller and transmits such data onto

power lines through a line-coupling circuit.

The device includes several primary functional blocks:

•

A power amplifier (PA) transmits data onto power lines through a line-coupling circuit.

•

The transmit path (Tx) consists of a high-precision, digital-to-analog converter (DAC), programmable amplifier

(TX_PGA), and low-pass filter (LPF).

•

The receive path (Rx) consists of two programmable amplifiers (RX_PGA1 and RX_PAG2) and a band-pass

filter [(an LPF and a high-pass filter (HPF)].

BLOCK DESCRIPTIONS

Power Amplifier Block

The power amplifier (PA) block consists of a high slew rate, high-voltage, and high-current operational amplifier.

The PA is configured with an inverting gain of 7 V/V, has a low-pass filter response, and maintains excellent

linearity and low distortion throughout its bandwidth. The PA is specified to operate from 7 V to 24 V and can

deliver up to ±1.9 A of continuous output current over the specified junction temperature range of –40°C to

+125°C. The PA block is shown in Figure 12.

Figure 12. PA Block Equivalent Circuit

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