FM1236SLASHHMF datasheet(13/20 Pages) PHILIPS

13 / 20 page

1997 Feb 03

Philips Components

Preliminary speciﬁcation

Desktop video & FM radio module

system M, N

FM1236

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

Note

1. A = Acknowledge.

ADDRESS SELECTION

VS = +5 V (PLL supply voltage)

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

CONTROL BYTE

Charge pump settings:

CP = 1, for fast tuning

CP = 0, for moderate speed tuning with slightly better residual oscillator FM.

It is recommended to set CP = 1 at all times in the TV mode. In the FM radio mode, set CP = 1 only during the search

tuning. Once the wanted channel is obtained, set CP = 0 to get the best signal-to-noise ratio.

Test mode settings:

T2 = T1 = 0; T0 = 1, for normal operation.

BYTE

BITS

MSB

654321

LSB

A(1)

Address byte

MA1

MA0

Program divider byte 1

n14

n13

n12

n11

n10

Program divider byte 2

Control information byte 1

RSA

RSB

Control information byte 2

MA1

MA0

ADDRESS

VOLTAGE AT PIN 15 (see note 1)

0 to 0.1VS

0.2 to 0.3VS

0.4 to 0.6VS

0.9VS to VS

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