FM1246/HM/I View Datasheet(PDF) - Philips Electronics
Part Name
Description
View to exact match
FM1246/HM/I Datasheet PDF : 24 Pages
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Philips Components
Desktop video & FM radio module
system CCIR I
Preliminary speciļ¬cation
FM1246
CONTROL BYTE
Charge pump settings:
CP = 1, for fast tuning
CP = 0, for moderate speed tuning with slightly better residual oscillator FM.
It is recommended to set CP = 1 at all times in the TV mode. In the FM radio mode, set CP = 1 only during the search
tuning. Once the wanted channel is obtained, set CP = 0 to get the best signal-to-noise ratio.
Test mode settings:
T2 = T1 = 0; T0 = 1, for normal operation.
PLL disabling:
OS = 0, for normal operation
OS = 1, for switching the charge pump to the high impedance state. IDC output voltage is LOW.
Ratio select bits
RSA
X
0
1
RSB
0
1
1
STEP SIZE
50 kHz (for FM band)
31.25 kHz (for slow picture search)
62.5 kHz (for normal picture search)
PORTS BYTE
FUNCTION
TV/FM bandswitching
FM band
Low band
Mid band
High band
TV mode
Power down mode; see note 1
System I negative mode
FM radio mode
AFC; see note 2
RIF; see note 3
Mono
Mute
BIT
P7
P6
P5
P4
P3
P2
P1
P0
1
0
1
0
1
1
0
1
0
0
1
0
0
1
0
0
0
1
1
0
0
0
0
1
0
0
0
0
0
1
0
1
0
1
0
0
0
1
1
0
1
1
0
0
Notes
1. If the TV function is not required, the tuner can be switched to power-down mode. In this mode the tuner reduces the
current consumption by up to 100 mA.
2. By this setting the FM radio AFC status can be read from the A/D bits in the status byte.
3. By this setting the RF input level can be read from the A/D bits in the status byte.
1997 May 14
14
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