AFE032 datasheet(18/77 Pages) TI1

18 / 77 page

18 k

´ p

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

Optional

RSET

47 PF

100 nF

PA Supply

CIN

17 k:

AFE032

SBOS669A – AUGUST 2013 – REVISED DECEMBER 2013

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Connecting the PA in a typical power line communication (PLC) application requires few additional components.

Figure 13 shows the typical connections to the PA block.

Figure 13. Typical Connections to the PA

The external capacitor (CIN) introduces a single-pole, high-pass characteristic to the PA transfer function. The CIN

and PA combination has a band-pass response because of the inherent low-pass transfer function from the PA.

The value of the high-pass cutoff frequency is determined by CIN reacting with the input resistance of the PA

circuit, and can be determined by Equation 1:

where:

•

CIN = external input capacitor and

•

fHP = desired high-pass cutoff frequency.

(1)

For example, setting CIN to 3.3 nF results in a high-pass cutoff frequency of 2.9 kHz. The voltage rating for CIN

should be determined to withstand operation up to the PA power-supply voltage.

When the transmitter is not in use, the output can be disabled and placed in a high-impedance state by following

the procedure outlined in the Power Amplifier Enable Sequence section.

Refer to the Initialization Sequence and Power Amplifier Enable Sequence sections for details on the proper

sequence when enabling the power amplifier.

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