L64724 LSI Logic Corporation, L64724 Datasheet - Page 152

• Manufacturer Part Number: L64724
• Description: Satellite Receiver
• Manufacturer: LSI Logic Corporation

5.8 Automatic Gain Control (AGC)
5.8.1 ADC Range and Power Reference
5-20
The suggested value for
Equation 5.25
The value of
equations,
carrier_bw refers to the natural frequency
This section describes the L64724 automatic gain control (AGC) function.
When the PWR_REF register (Group 4, APR 24) is set to the
recommended value of 84, the AGC sets the ratio of the signal range to
the ADC range to 1:1.7 (see
Figure 5.9
1.7
-1.0
-1.7
Demodulator Module Functional Description
0.0
1.0
Voltage
carrier_bw
Equation 5.21
Eye Pattern and ADC Range
n
Suggested Values for
n
from
=
0.0
2
Equation 5.25
Rb MS / s
and
n
is shown in
Figure
Equation
t / Symbol Period
can be substituted in the carrier loop
5.9.)
n
5.22, for
0.5
2 * R = 3.4
Equation
n
. Rs (1/T) is the symbol rate.
a
5.25.
and
b
. Here
1.0
2S =
Input
Signal
Range