MC44829 Datasheet, PDF (5/10 Pages) Motorola, Inc – TV AND VCR I2C PLL TUNING CIRCUIT WITH 1.3 GHz PRESCALER AND MIX/OSC DECODER

MC44829
Figure 3. Typical HF Input Impedance
–j +j
0
0.5
0.5
1.3 GHz
ZO = 50 Ω
1
1
1.0 GHz
0.5
1
2
2
2
500 MHz
50 MHz
Data Format and Bus Receiver
The circuit receives the information for tuning and control
via the I2C bus. The incoming information, consisting of a
chip address byte followed by two or four data bytes, is
treated in the I2C bus receiver. The definition of the
permissible bus protocol is shown below:
1_STA CA
2_STA CA
3_STA CA
4_STA CA
CO BA
FM FL
CO BA
FM FL
STO
STO
FM FL
CO BA
STO
STO
STA = Start Condition
STO = Stop Condition
CA = Chip Address Byte
CO = Data Byte for Control Information
BA = Band Information
FM = Data Byte for Frequency Information (MSB’s)
FL = Data Byte for Frequency Information (LSB’s)
Figure 4. Complete Data Transfer Process
SDA
SCL
S
1–7
8
9
STA ADDRESS R/W ACK
CA
1–7
8
9
DATA
ACK
1–7
8
DATA
9
P
ACK STO
MOTOROLA ANALOG IC DEVICE DATA
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