LV25400W_10 Datasheet, PDF (36/42 Pages) Sanyo Semicon Device – For Automotive Applications DSP Tuner Front End

LV25400W
Continued from preceding page.
No.
Control block/data
(29) AM/FM narrow AGC setting
Description
• Sets the AM/FM narrow AGC sensitivity.
D33-4 to D33-7
(30) Keyed AGC setting
4 bit
• Controls the FM keyed AGC sensitivity.
D32-8 to D32-11
4 bit
(31) AM RF AGC amplifier
• Sets the AM RF AGC amplifier circuit threshold (steep).
threshold (steep) setting
4 bit
D32-12 to D32-15
(32) AM RF AGC amplifier
• Sets the AM RF AGC amplifier circuit threshold (gradual).
threshold (gradual) setting
4 bit
D32-16 to D32-19
(33) S-meter shifter control
• Controls the FM S-meter shifter circuit output value.
D32-20 to D32-24
5 bit
(34) Analog (narrow) IF AGC
• Corrects the sample-to-sample variations in the IF AGC clamp circuit.
clamp variations correction
D32-25 to D32-28
Amount of correction : ±5 dB
(35) FM PIN diode forced on
state bit
FMFETOFF
(36) Keyed AGC connection
circuit selection
W_KEYED
4 bit
• Forcibly sets the FM PIN diode to the on state.
1 bit
• Modifies the keyed AGC connection circuit.
1 bit
Keyed AGC switch
0
Wide + narroww
1
Narrow only
(37) D31-31
D32-31
• Sub-code address
Each 1 bit
Related data
Programmable Divider Structure
FMIN
DVS
4 bits
Swallow
Counter
12 bits
fvco/N
Programmable
Divider
ferf
fvco = ferf × N
PD φE
DVS
1
0
Set divisor (N)
272 to 65535
-
Input frequency range (f (MHz))
120 ≤ f ≤ 270
-
IC internal FMIN pin
Selected
Stopped
* : Since the IC is closed internally, the input sensitivity is not specified.
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