Philips Semiconductors
Product specification
Multistandard vision and sound-IF PLL with
DVB-IF processing
DVB mixer
The VCO can be controlled by an external DC signal to
provide a carrier for the down-conversion of the DVB-IF
signal. The VCO frequency as a function of the voltage at
pin 16 is given in Figs 10 and 11.
DVB AGC
For the DVB operation a peak AGC detector is activated.
The peak value of (digital) QAM signal is detected and
controlled to a constant value by the variable VIF amplifier.
The detector bandwidth is adapted to the signal frequency
(3 to 11 MHz). The external AGC time constant is given by
the VIF AGC capacitor at pin 28.
TDA9819
The DVB output signal V
O DVB
can be adjusted in a range
of
±3
dB by a control voltage
∆V
adj
at pin 15. The internal
AGC can be switched off (see Table 2) and the IF gain can
be controlled by an external voltage at pin 13. The tuner
AGC is active in both instances.
DVB output buffer
The output buffer for the DVB signal has a high bandwidth
and 0 dB gain. An inverting configuration was chosen to
obtain minimum distortion. For non-DVB standards the
buffer is switched to a mute to reduce the output signal
level.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
V
P
V
n
t
sc(max)
V
19
T
stg
T
amb
V
es
Notes
1. I
P
= 125 mA; T
amb
= 70
°C;
R
th(j-a)
= 60 K/W.
2. Machine model class B.
THERMAL CHARACTERISTICS
SYMBOL
R
th(j-a)
PARAMETER
thermal resistance from junction to ambient
CONDITIONS
in free air
VALUE
60
UNIT
K/W
PARAMETER
supply voltage (pin 29)
voltage at pins 1 to 9, 11 to 13,
15, 16, 19, 22, 23 and 28 to 32
maximum short-circuit time
tuner AGC output voltage
storage temperature
operating ambient temperature
electrostatic handling voltage
note 2
CONDITIONS
maximum chip temperature of 125
°C;
0
note 1
0
−
0
−25
−20
−300
MIN.
MAX.
7.0
V
P
10
13.2
+150
+70
+300
UNIT
V
V
s
V
°C
°C
V
1998 Jul 14
8
PHILIPS [ NXP SEMICONDUCTORS ]
