Philips Components
Desktop video & FM radio module
system M, N
Preliminary specification
FM1236
PLL disabling:
OS = 0, for normal operation
OS = 1, for switching the charge pump to the high impedance state.
Ratio select bits
RSA
X
0
1
RSB
0
1
1
50 kHz
31.25 kHz
62.5 kHz
STEP SIZE
PORTS BYTE
FUNCTION
TV/FM bandswitching
FM band
Low band
Mid band
High band
TV mode
Power down mode; see note 1
System M, N 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 Feb 03
14