t4225b ATMEL Corporation, t4225b Datasheet - Page 9

• Manufacturer Part Number: t4225b
• Description: Low-cost Time-code Receiver
• Manufacturer: ATMEL Corporation

Rev. A3, 03-Dec-98
Figure 17 shows a typical diagram to control sensitivity
by measuring the voltage at INT vs. Vi
(e.g., generator frequency 77.5 kHz) is coupled to the in-
put of the circuit via a transformer with a 50-
termination. In order to avoid a load at the INT Pin, the
voltage should be measured with a meter input resistance
> 1 G
(1)
(2)
Layout
W
normal curve
no optimal layout conditions
!
Generator
signal
(e.g., 77.5 kHz)
Ra = Rb = 50
La = Lb = 88 H
W
50
Rg
m
Ra La
n
95 10212
. The input signal
Lb
–10 dB
Rb
Figure 18.
Figure 19.
W
IN1
IN
95 11210
1.0
0.9
0.8
0.7
0.6
0.5
T4225B
–20
VCC
1
2
0
INT
20
Figure 17.
V
in
40
( dB
m
V )
(Ri > G
V
60
T4225B
INT
95 11213
80
W
)
95 11208
100
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