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TDA8725T Fiches technique(PDF) 2 Page - NXP Semiconductors

No de pièce TDA8725T
Description  Antenna signal processor
Download  10 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA8725T Fiches technique(HTML) 2 Page - NXP Semiconductors

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1995 Mar 21
2
Philips Semiconductors
Product specification
Antenna signal processor
TDA8725T
FEATURES
• 75 Ω antenna input stage
• 75 Ω VCR RF input stage
• 75 Ω VCR tuner output
• 75 Ω TV tuner output.
GENERAL DESCRIPTION
The TDA8725T has been designed to split and combine
RF signals for Picture-In-Picture (PIP) and VCR
applications.
For PIP applications, the antenna input signal is split and
fed to the main TV tuner and the PIP tuner. Good signal
suppression between the two outputs enables good quality
of the main picture when the PIP tuner is in use.
For VCR applications, the antenna input signal is split and
then fed directly to the VCR tuner and the TV tuner after
being combined with the VCR - RF signal. Good signal
suppression between the two outputs enables good quality
pictures when the TV and VCR tuners are both operating.
Good signal suppression between the VCR input and the
antenna input reduces the amount of unwanted signal on
the antenna.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
VP
supply voltage (pins 8 and 9)
4.75
5.0
5.25
V
IP
supply current (pins 8 and 9)
65
mA
fi
input frequency
40
860
MHz
Gp
power gain
from antenna to VCR
3.5
5.0
6.5
dB
from antenna to TV
4
5.5
7
dB
from VCR
0
dB
F
noise figure
6.5
9.0
10
dB
IP2
antenna linearity 2nd order
intercept point
at 40 MHz
137
140
dB
µV
at 860 MHz
119
124
dB
µV
IP3
antenna linearity 3rd order
intercept point
at 40 MHz
121
124
dB
µV
at 860 MHz
108
111
dB
µV
ssup
signal suppression
VCR input to antenna
0 to 1 GHz
32
37
dB
1 to 3 GHz
25
30
dB
VCR output to TV output
0 to 300 MHz
35
40
dB
300 to 860 MHz
22
27
dB
TV output to VCR output
0 to 300 MHz
35
40
dB
300 to 860 MHz
22
27
dB
VSWR
voltage standing wave ratio
at the antenna input
2.5
4
at the outputs
1.5
3
Pi(max)
maximum input power on antenna
for 1 dB gain compression
−−10
dBm


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