L64704 LSI Logic Corporation, L64704 Datasheet - Page 126
L64704
Manufacturer Part Number
L64704
Description
Satellite Decoder Technical Manual 5/97
Manufacturer
LSI Logic Corporation
Datasheet
1.L64704.pdf
(220 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
L64704BQC-60
Manufacturer:
LSI
Quantity:
20 000
- Current page: 126 of 220
- Download datasheet (2Mb)
5.7
Automatic Gain
Control (AGC)
5.7.1
ADC Range and
Power
Reference
Figure 5.11
Eye Pattern and
ADC Range
Equation 5.12
5-22
This section describes the L64704’s automatic gain control (AGC) and is
divided into the following subsections:
When the PWR_REF register (Group 4, APR 19) is set to the recom-
mended value of 84, the AGC sets the ratio of the signal range to the
Analog-to-Digital Convertor (ADC) range to 1:1.7 (see
-1.0
-1.7
Assuming that the signal power at the input of the ADC is normalized to
1 V
Q signals). The value of PWR_REF is computed from
where L = 1 if CLK_DR (Group 4, APR 14) = 0 (no internal decimation
filter is used), or L = 4 if CLK_DR = 1 or 2. R is the ADC range. For L = 1
Demodulator Module Functional Description
PWR_REF
1.7
1.0
0.0
Voltage
2
Section 5.7.1, “ADC Range and Power Reference”
Section 5.7.2, “Power Control Loop”
Section 5.7.3, “Power Level”
, the range of the signal (2S) is 2 V (the noise-free level of the I and
=
243 L
-----------------
0.0
R
2
t / Symbol Period
0.5
2 * R = 3.4
Figure
Equation
1.0
5.11).
5.12.
2S =
Input
Signal
Range
Related parts for L64704
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Mpeg-2 Audio/video Decoder
Manufacturer:
LSI Logic Corporation
Datasheet:
Part Number:
Description:
Satellite Receiver
Manufacturer:
LSI Logic Corporation
Datasheet:
Part Number:
Description:
Tuner/receiver Chipset
Manufacturer:
LSI Logic Corporation
Datasheet:
Part Number:
Description:
Tuner And Satellite Receiver Chipset Data Sheet 2/01
Manufacturer:
LSI Logic Corporation
Datasheet:
Part Number:
Description:
Smatv Qam Encoder
Manufacturer:
LSI Logic Corporation
Datasheet:
Part Number:
Description:
DVB Qam Modulator
Manufacturer:
LSI Logic Corporation
Datasheet:
Part Number:
Description:
Dvb-t Cofdm Demodulator Technical Manual 2/00
Manufacturer:
LSI Logic Corporation
Datasheet:
Part Number:
Description:
16-Bit HCMOS Multiplier / Accumulators
Manufacturer:
LSI Logic Corporation
Part Number:
Description:
Transport with Embedded CPU and Control
Manufacturer:
LSI Logic Corporation
Part Number:
Description:
32-Bit HCMOS IEEE Floating-Point Processor
Manufacturer:
LSI Logic Corporation
Part Number:
Description:
Controllers, Transport Controller with Embedded MIPS CPU (TR4101)
Manufacturer:
LSI Logic Corporation
Datasheet:
Part Number:
Description:
Variable-Length Video Shift Registers
Manufacturer:
LSI Logic Corporation