TDA9819T datasheet(8/40 Pages) PHILIPS

8 / 40 page

1998 Jul 14

Philips Semiconductors

Product speciﬁcation

Multistandard vision and sound-IF PLL with

DVB-IF processing

TDA9819

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.

The DVB output signal VO DVB can be adjusted in a range

±3 dB by a control voltage ∆Vadj 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).

Notes

1. IP = 125 mA; Tamb =70 °C; Rth(j-a) = 60 K/W.

2. Machine model class B.

THERMAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

supply voltage (pin 29)

maximum chip temperature of 125

°C;

note 1

7.0

voltage at pins 1 to 9, 11 to 13,

15, 16, 19, 22, 23 and 28 to 32

0VP

tsc(max)

maximum short-circuit time

−

V19

tuner AGC output voltage

13.2

Tstg

storage temperature

−25

+150

°C

Tamb

operating ambient temperature

−20

+70

°C

Ves

electrostatic handling voltage

note 2

−300

+300

SYMBOL

PARAMETER

CONDITIONS

VALUE

UNIT

Rth(j-a)

thermal resistance from junction to ambient

in free air

K/W

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