L64780 LSI Logic Corporation, L64780 Datasheet - Page 75

• Manufacturer Part Number: L64780
• Description: Dvb-t Cofdm Demodulator Technical Manual 2/00
• Manufacturer: LSI Logic Corporation

4.4.4 Address Line 0x0A
AGC_TARGET_LSB
AGC_DISABLE
AGC_POL
Parameter Registers
0x0A
AGC_TARGET_LSB
7
AGC Target RMS Value (LSB)
These bits select the LSBs of the Target RMS value of
the AGC Loop (see
Value”). The initial condition for these bits is 0b100.
AGC Disable
This bit determines if the AGC is disabled (1) or not (0).
The initial condition for the AGC_DISABLE bit is 0,
Normal Operational Mode.
AGC Loop Polarity
This bit selects the polarity of the external AGC Loop.
If the polarity is positive (this bit is 0), the gain of the
external down-converter must increase with increasing
voltage from the AGCOUT pin.
If the polarity is negative (this bit is 1), the gain of the
external down-converter must decrease with increasing
voltage from the AGCOUT pin.
The initial condition for the AGC_POL is 1, negative.
5
AGC_DISABLE AGC_POL
Section 2.3.1, “AGC Target RMS
4
3
2
AGC_GAIN
R/W [7:5]
R/W 4
R/W 3
4-23
0