Philips tda8725 DATASHEETS
INTEGRATED CIRCUITS
DATA SH EET
TDA8725T
Antenna signal processor
Product specification
File under Integrated Circuits, IC02
Philips Semiconductors
1995 Mar 21
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.
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
GENERAL DESCRIPTION
The TDA8725T has been designed to split and combine
RF signals for Picture-In-Picture (PIP) and VCR
applications.
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
V
P
I
P
f
i
G
p
supply voltage (pins 8 and 9) 4.75 5.0 5.25 V
supply current (pins 8 and 9) − 65 − mA
input frequency 40 − 860 MHz
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
IP3 antenna linearity 3rd order
intercept point
s
sup
signal suppression
at 40 MHz 137 140 − dBµV
at 860 MHz 119 124 − dBµV
at 40 MHz 121 124 − dBµV
at 860 MHz 108 111 − dBµV
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
P
i(max)
maximum input power on antenna
−−10 − dBm
for 1 dB gain compression
1995 Mar 21 2
Philips Semiconductors Product specification
Antenna signal processor TDA8725T
ORDERING INFORMATION
TYPE NUMBER
PACKAGE
NAME DESCRIPTION VERSION
TDA8725T SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
BLOCK DIAGRAM
(1)
(2)
(1) TV tuner or main tuner.
(2) VCR tuner or PIP tuner.
Fig.1 Block diagram.
1995 Mar 21 3
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