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 amplies 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.
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