YTD427 Просмотр технического описания (PDF) - Unspecified

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YTD427

ISDN DSU Analog Front End

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Chapter 4

FUNCTIONS

Receive Interface

Receive pin RXU has a high input impedance. An example of a reference circuit

of the receive interface is shown in Figure 4.1.

R=3.9k

(1%)

R=1.2k

(1%)

YTD427

RXU

SGR

Figure 4.1: Receive Interface Connection

AGC

The AGC section adjusts the gain in 0.22 dB step in the range from 0.0 to 56.1

dB at the receive signal center frequency (f=160 kHz) and amplies the receive

signal amplitude to the maximum dynamic range.

Filter

The lter section is to prevent the ADC and the peak hold section from erro-

neous operation caused by high-frequency noise.

Peak Hold section Peak hold is performed during the initial training so that the gain of the AGC

section is set to make best communication condition.

ADC

The ADC section makes an A/D conversion of the received signal and trans-

f(eArDs CitKto) pYrTovDid4e2d6Bb.yTYhTeDA4/2D6Bc.onversion timing is synchronized to the clock

Digital Interface The digital section provides the interface to YTD426B.

11

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