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| FI1216MK2 Datasheet, PDF (13/20 Pages) NXP Semiconductors – Desktop video tuner system CCIR B/G | |||
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Philips Components
Desktop video tuner
system CCIR B/G
Preliminary speciï¬cation
FI1216MK2
Ratio select bits
RSA
X
0
0
1
1
1
RSB
STEP SIZE
50 kHz
31.25 kHz (for slow picture search)
62.5 kHz (for normal picture search)
PORTS BYTE
Band switching
BAND
Low band
Mid band
High band
BIT(1)
P0
P1
P2
P3(2)
P4
P5
P6
P7
0
0
0
X
0
1
0
1
0
0
0
X
1
0
0
1
0
0
0
X
1
1
0
0
Notes
1. X = donât care; P0 to P7 are output ports on the PLL device.
2. P3 is a system switch output for customer applications.
TELEGRAM EXAMPLES (WRITE MODE)
Start - Adb - Ack - Db1 - Ack - Db2 - Ack - Cb - Ack - Pb - Ack - Stop.
Start - Adb - Ack - Cb - Ack - Pb - Ack - Db1 - Ack - Db2 - Ack - Stop.
Start - Adb - Ack - Db1 - Ack - Db2 - Ack - Cb - Ack - Stop.
Start - Adb - Ack - Db1 - Ack - Db2 - Ack - Stop.
Where:
Start = start condition
Adb = address byte
Ack = acknowledge
Db1 = divider byte 1
Db2 = divider byte 2
Cb = control byte
Pb = ports byte
Stop = stop condition.
Remark: for channel selection involving band switching, and to ensure smooth tuning to the desired channel without
causing unnecessary charge pump action, it is recommended to consider the difference between wanted channel
frequency (fw) and the current channel frequency (fc):
⢠If fw > fc, use telegram as:
Start - Adb - Ack - Db1 - Ack - Db2 - Ack - Cb - Ack - Pb - Ack - Stop.
⢠If fw < fc, use telegram as:
Start - Adb - Ack - Cb - Ack - Pb - Ack - Db1 - Ack - Db2 - Ack - Stop.
Unnecessary charge pump action will result in very low tuning voltage (VT â 0 V) which may drive the oscillator to extreme
conditions.
1997 Mar 13
13
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