TDA9850 Ver la hoja de datos (PDF) - Philips Electronics
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TDA9850 Datasheet PDF : 32 Pages
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Philips Semiconductors
I2C-bus controlled BTSC stereo/SAP decoder
Preliminary specification
TDA9850
REQUIREMENTS FOR THE COMPOSITE INPUT SIGNAL TO ENSURE CORRECT SYSTEM PERFORMANCE
SYMBOL
PARAMETER
COMPL+R(rms)
∆COMP
composite input level for 100%
modulation L + R (25 kHz
deviation); RMS value;
fi = 300 Hz
composite input level
spreading under operating
conditions
Zsource
flf
fhf
THDL,R
source impedance
low frequency roll-off
high frequency roll-off
total harmonic distortion L + R
S/N
signal-to-noise ratio
L + R/noise
critical picture modulation;
note 3
with sync only
αSB
side band suppression mono
into unmodulated SAP carrier;
SAP carrier/side band
αSP
spectral spurious attenuation
L + R/spurious
n = 1, 4, 5, 6
n = 2, 3
CONDITIONS
measured at COMP
MIN.
162
Tamb = −20 to +70 °C; aging; −0.5
power supply influence
note 1
−
25 kHz deviation L + R; −2 dB −
25 kHz deviation L + R; −2 dB 100
fi = 1 kHz; 25 kHz deviation −
fi = 1 kHz; 125 kHz deviation; −
note 2
CCIR 468-2 weighted quasi
peak; L + R; 25 kHz deviation;
fi = 1 kHz; 75 µs de-emphasis 44
54
mono signal: 25 kHz deviation, 40
fi = 1 kHz; side band: SAP
carrier frequency ±1 kHz
50 Hz to 100 kHz;
mainly n × fH; no de-emphasis;
L + R; 25 kHz deviation,
35
f = 1 kHz as reference
26
TYP.
250
MAX.
363
−
+0.5
low-ohmic 5
−
5
−
−
−
0.5
−
1.5
−
−
−
−
−
−
−
−
−
−
UNIT
mV
dB
kΩ
Hz
kHz
%
%
dB
dB
dB
dB
dB
Notes
1. Low-ohmic preferred, otherwise the signal loss and spreading at COMP, caused by ZO and the composite input
impedance (see Chapter “Characteristics”; row head “Input level adjustment control”) must be taken into account.
2. In order to prevent clipping at over-modulation (maximum deviation in the BTSC system for 100% modulation is
73 kHz).
3. For example colour bar or flat field white; 100% video modulation.
1995 Jun 19
10
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