MC44864

8

MOTOROLA ANALOG IC DEVICE DATA

Figure 5. TV Tuner for Automatic Alignment

VHF

UHF

12 V

AGC

DA1

Mixer

Filter

Filter

Local

Oscillator

IF

33 V

5.0 V

SCL

MC44864

PLL–D/A IC

Band Buffers

BIII

SDA

DA2

DA3

VCC3

Antenna

HF Input

XTAL

VCC2

VCC1

Clock

Data

D–to–A

Converters

NVM

Phase Cmp

Amp In

VTUN

Figure 6. Definition of Bytes

CA1_PLL Chip Address

1

1

0

0

A3

A2

A1

A0 = 0

ACK

CO_Control Information

1

R6

T

P

R3

R2

R1

R0

ACK

BA_Band Information

B7

X

B5

X

B3

X

B1

X

ACK

FM_Frequency Information (with MSB)

0

N14

N13

N12

N11

N10

N9

N8

ACK

FL_Frequency Information (with LSB)

N7

N6

N5

N4

N3

N2

N1

N0

ACK

Chip Addresses

The chip address is programmable by Pin CA.

The PLL addresses C0, C2, C4, C6 are officially allocated

to PLL–IC’s.

The addresses C8, CA, CC, CE are not officially allocated.

Care has to be taken in the application that no conflict occurs

with other devices on the same I2C Bus when using the

addresses C8 to CE.

CA Pin (13)

A3

A2

A1

A0

Address

Function

–0.04 VCC1 to

0.1 VCC1

0

0

0

0

0

1

0

0

C0

C2

1st PLL

1st DAC

Open or 0.2

VCC1to0.3VCC1

0

0

1

1

0

1

0

0

C4

C6

2nd PLL

2nd DAC

0.42 VCC1 to

0.75 VCC1

1

1

0

0

0

1

0

0

C8

CA

3rd PLL

3rd DAC

0.9 VCC1 to 1.2

VCC1

1

1

1

1

0

1

0

0

CC

CE

4th PLL

4th DAC

PLL SECTION

Data Format and Bus Receiver

The circuit receives the information for tuning and control

via I2C Bus. The incoming information is treated in the bus

receiver. The definition of the permissible bus protocol is

shown in the four examples below:

Ex. 1

STA

CA1

CO

BA

STO

Ex. 2

STA

CA1

FM

FL

STO

Ex. 3

STA

CA1

CO

BA

FM

FL

STO

Ex. 4

STA

CA1

FM

FL

CO

BA

STO

STA = Start Condition

STO = Stop Condition

CA1 = Chip Address Byte of the PLL Section

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 6 shows the five bytes of information that are

needed for circuit operation: there is a chip address, two

bytes of control and band information and two bytes of

frequency information.