TDA8725T Datasheet, PDF (2/10 Pages) NXP Semiconductors – Antenna signal processor

Philips Semiconductors
Antenna signal processor
Product specification
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
V_P
I_P
f_i
G_p
F
IP2
IP3
s_sup
VSWR
P_i(max)
PARAMETER
CONDITIONS
supply voltage (pins 8 and 9)
supply current (pins 8 and 9)
input frequency
power gain
from antenna to VCR
from antenna to TV
from VCR
noise figure
antenna linearity 2nd order
intercept point
antenna linearity 3rd order
intercept point
at 40 MHz
at 860 MHz
at 40 MHz
at 860 MHz
signal suppression
VCR input to antenna
VCR output to TV output
0 to 1 GHz
1 to 3 GHz
0 to 300 MHz
TV output to VCR output
voltage standing wave ratio
300 to 860 MHz
0 to 300 MHz
300 to 860 MHz
at the antenna input
at the outputs
maximum input power on antenna
for 1 dB gain compression
MIN.
4.75
−
40
TYP.
5.0
65
−
MAX.
5.25
−
860
UNIT
V
mA
MHz
3.5
5.0
6.5
4
5.5
7
−
0
−
6.5
9.0
10
137
140
−
119
124
−
121
124
−
108
111
−
dB
dB
dB
dB
dBµV
dBµV
dBµV
dBµV
32
37
−
dB
25
30
−
dB
35
40
−
dB
22
27
−
dB
35
40
−
dB
22
27
−
dB
−
2.5
4
−
1.5
3
−
−10
−
dBm
1995 Mar 21
2