LV25450PNW Datasheet, PDF (35/40 Pages) Sanyo Semicon Device – For Automotive Applications DSP Tuner Front End

Continued from preceding page.
No.
Control block/data
(27) IF AGC amplifier circuit off
switching
NARROW_OFF
LV25450PNW
Description
• Switches off the IF AGC amplifier circuit.
1 bit
IF AGC amplifier
0
ON (normal operation)
1
OFF
(28) AM/FM wide AGC setting • Sets the AM/FM wide AGC sensitivity.
Related data
AM/FM
W_AGC0 to W_AGC3
4 bit
(29) AM/FM narrow AGC setting • Sets the AM/FM narrow AGC sensitivity.
AM/FM
N_AGC0 to N_AGC3
4 bit
(30) AM RF AGC amplifier
• Sets the AM RF AGC amplifier circuit threshold (steep) and the FM Keyed AGC
threshold (steep) and
sensitivity.
Keyed AGC setting data
4 bit
AM-RF-AGC
FM-Keyed
KEY_AGC0 to KEY_AGC3
Amp threshold (steep)
AGC threshold
AM/FM
0000
0001
0010
0011
0100
•
•
1011
1100
1101
1110
1111
1.0V
↓
↓
↓
↓
↓
↓
↓
↓
↓
↓
2.5V
0.14V
↓
↓
↓
↓
↓
↓
↓
↓
↓
↓
2.2V
(31) AM RF AGC amplifier
• Data used to set the AM RF AGC amplifier threshold (gradual) and the All Pass Filter. AM/FM
threshold (gradual) and All
Pass Filter setting data
4 bit
AM-RF-AGC
FM-Keyed AGC threshold
phase shift
APF_ADJ0 to APF_ADJ3
Amp threshold
(gradual)
the software
trimming
0000
1.0+VBE
0000
0
0001
↓
1000
1
0010
↓
0100
2
0011
↓
1100
3
0100
↓
0010
4
•
↓
•
•
•
↓
•
•
1011
↓
1101
11
1100
↓
0011
12
1101
↓
1011
13
1110
↓
0111
14
1111
2.5V+VBE
1111
15
Small
↓
↓
↓
↓
↓
↓
↓
↓
↓
↓
Large
(32) S-meter shifter control
• Controls the FM S-meter shifter circuit output value.
S_METER0 to S_METER4 5 bit
(33) Analog (narrow) IF AGC
• Corrects the sample-to-sample variations in the IF AGC clamp circuit.
clamp variations correction
ADJ_N0 to ADJ_N2
Amount of correction : ±2 dB
(34) FM PIN diode forced on
state bit
FMFETOFF
3 bit
• Forcibly sets the FM PIN diode to the on state.
1 bit
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