MC44S803EP FREESCALE [Freescale Semiconductor, Inc], MC44S803EP Datasheet - Page 25

• Manufacturer Part Number: MC44S803EP
• Description: Low Power CMOS Broadband Tuner
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Freescale Semiconductor
CURRENT LNA GAIN DATA REGISTER (LNAGain)
6 MSBs of the register. When controlled by an external
analog control, the analog voltage is converted to a digital
word using an analog to digital converter (ADC). The
resulting value is contained in LNA Gain Bits. The AGC
power detector at the input of the IC. This is a broadband
power detector that senses the total power at the input of the
IC. It can be used to optimize performance of the front end by
adjusting the AGC algorithm in case of high total input power.
The IF Pwr bits contain the reading from the power detector
at the second IF. It also is used to optimize performance.
Table 35. IF Power Detector Levels
MSB
D19
G5
This register holds the current LNA gain setting in the
The RF Pwr bits contain the reading from the broadband
Highest
Lowest
D18
G4
LNA Gain Bits
D17
G3
Level
4
5
7
6
2
3
1
0
D16
G2
P2
D15
1
1
1
1
0
0
0
0
G1
P1
D14
Table 34. VCO Test Register Field Description
G0
0
0
1
1
1
1
0
0
MSB
LSB
D13
P0
P2
0
1
1
0
0
1
1
0
0 - 13 Reserved
Bit #
14
15
16
17
18
19
Figure 28. LNA Gain Register Format
RF Pwr
D12
P1
Peak mV
Lock Detect LO2
Lock Detect LO1
VCO2 Out of Range Low
VCO2 Out of Range High
VCO1 Out of Range Low
VCO1 Out of Range High
< 629
1271
1113
994
881
800
700
629
D11
P0
Description
D10
P2
IF Pwr
D9
P1
Read En bit, in the LNA AGC register, must be set to 1 in
order to allow reading back of the RF AGC setting. Note that
when reading back this register, bits G2:G0 are inverted. Also
note that when in the analog mode, the readings for levels
corresponding to 0 through 9 are all read back as 9.
Table 36. RF Power Detector Levels
Highest
Lowest
D8
P0
Bit Name
D7
RH2
RH1
LD2
LD1
RL2
RL1
Level
D6
4
5
7
6
2
3
1
0
Pass
1
1
0
1
0
1
D5
P2
1
1
1
1
0
0
0
0
D4
P1
0
0
1
1
1
1
0
0
D3
P0
0
1
1
0
0
1
1
0
D2
Peak mV
MC44S803
D1
< 370
992
824
699
627
518
441
370
LSB
D0
25