TDA8730 Datasheet, PDF (5/10 Pages) NXP Semiconductors – PLL FM demodulator for DBS signals

Philips Semiconductors
PLL FM demodulator for DBS signals
Preliminary specification
TDA8730
FUNCTIONAL DESCRIPTION
The TDA8730 is a PLL FM
demodulator intended for use in
satellite tuners. It can
demodulate frequency
deviations ranging from
13.5 MHz_(p-p) (DBS services) up
to 25 MHz(p-p) (FSS services)
and offers a high demodulation
linearity. The circuit is optimized
for operation at 479.5 MHz (the
European IF for satellite tuners)
and can handle the various
broadcasting standards that are
in use (including MAC).
Due to the PLL principle,
demodulation noise threshold
extension is possible. The high
sensitivity of the balanced IF
input reduces the additional
gain, required in the tuner.
An on chip AGC circuit delivers a
gain control signal for use by the
tuner IF amplifier, and a voltage
regulator makes the circuit
insensitive supply voltage
changes.
LIMITING VALUES
In accordance with the Absolute Maximum System (IEC 134)
SYMBOL
V_DD
I_DD
I_O(source)
V_AGC
t_sc
V_AGC(adj)
T_stg
T_j
T_amb
PARAMETER
supply voltage
input voltage
output source current
AGC output voltage
max short circuit time of outputs
AGC threshold adjustment voltage
storage temperature
junction temperature
operating ambient temperature
MIN.
−0.3
−0.3
−
−
10
−0.3
−55
−
−25
MAX.
11
V_DD
10
11
−
V_DD
150
150
85
UNIT
V
V
mA
V
s
V
°C
°C
°C
THERMAL RESISTANCE
SYMBOL
R_{th j-a}
PARAMETER
from-junction-to-ambient in free air
TYP.
55
MAX. UNIT
−
K/W
March 1991
5