TDA9850T Philips Semiconductors, TDA9850T Datasheet - Page 10

• Manufacturer Part Number: TDA9850T
• Description: I2C-bus controlled BTSC stereo/SAP decoder
• Manufacturer: Philips Semiconductors

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