Philips Components
Desktop video & FM radio module
system CCIR I
handbook, halfpage
VCC
R1
R2
R3
100 Ω
15
AS
C1
56 pF
Preliminary specification
FM1246
Video buffer
A video buffer is built into the video module to enable the
unit to drive a 75 Ω load directly.
I2C-bus load
The FM1246 contains a series resistor (R = 100 Ω) in the
SCL and SDA lines. Both lines also have a capacitive load
of typical 22 pF (see Fig.3).
PLL IC
R4
100 Ω
R5
100 Ω
C2
22 pF 14
SDA
13
SCL
C3
22 pF
CCA507
Fig.3 I2C-bus load.
70
handbook, full pagewidth
video S/N
(dB)
50
CCA651
30
10
20
1997 May 14
40
60
80
100
120
RF input level (dBµV)
Fig.4 Typical video signal-to-noise ratio versus RF input level.
16