FM1246/HM/PH 데이터 시트보기 (PDF) - Philips Electronics

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FM1246/HM/PH

Desktop video & FM radio module system CCIR I

Philips Electronics 

Philips Components

Desktop video & FM radio module

system CCIR I

Preliminary specification

FM1246

APPLICATION INFORMATION

A detailed description of the I2C-bus specification, with applications, is given in brochure ‘‘The I2C-bus and how to

use it’’. This brochure may be ordered using the code number 9398 393 40011.

WRITE mode

BITS

BYTE

7

MSB

6

5

4

3

2

1

0

LSB

A(1)

Address byte

1

1

0

0

0

MA1 MA0

0

A

Program divider byte 1

0

n14

n13

n12

n11

n10

n9

n8

A

Program divider byte 2

n7

n6

n5

n4

n3

n2

n1

n0

A

Control information byte 1

1

CP

T2

T1

T0

RSA RSB

OS

A

Control information byte 2 P7

P6

P5

P4

P3

P2

P1

P0

A

Note

1. A = Acknowledge.

ADDRESS SELECTION

VS = +5 V (PLL supply voltage).

MA1

0

0

1

1

MA0

0

1

0

1

ADDRESS

C0

C2

C4

C6

VOLTAGE AT PIN 15 (see note 1)

0.0VS to 0.1VS

0.2VS to 0.3VS

0.4VS to 0.6VS

0.9VS to 1.0VS

Note

1. If the AS pin is left floating, the internal bias will automatically set the address to C2.

PROGRAMMABLE DIVIDER SETTINGS (BYTES 1 AND 2)

Divider ratio:

N = 16 × {fRF(pc) + fIF(pc)}, where (pc) is picture carrier and fRF and fIF are expressed in MHz.

fosc = N⁄16 (MHz).

N = (8192 × n13) + (4096 × n12) + (2048 × n11) + (1024 × n10) + (512 × n9) + (256 × n8) + (128 × n7) + (64 × n6) +

(32 × n5) + (16 × n4) + (8 × n3) + (4 × n2) + (2 × n1) + n0

For FM radio, fIF(fm) = 10.70 MHz

N = (fRF + fIF(fm))/step size = (fRF + fIF(fm))/50 kHz = 20 × (fRF + fIF(fm))

1997 May 14

13

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