參數(shù)資料
型號(hào)： TDA9855WP
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： I2C-bus controlled BTSC stereo/SAP decoder and audio processor
中文描述： SPECIALTY CONSUMER CIRCUIT, PQCC68
文件頁(yè)數(shù)： 12/52頁(yè)
文件大?。?/td> 345K
代理商： TDA9855WP
1997 Nov 04
12
Philips Semiconductors
Product specification
I
2
C-bus controlled BTSC stereo/SAP
decoder and audio processor
TDA9855
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
o
and the composite input
impedance (see Chapter “Characteristics”, Section INPUT LEVEL ADJUSTMENT CONTROL) must be taken into
account.
In order to prevent clipping at over-modulation (maximum deviation in the BTSC system for 100% modulation is
73 kHz).
2.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
COMP
L+R(rms)
composite input level for 100%
modulation L + R;
25 kHz deviation;
f
i
= 300 Hz; RMS value
COMP
composite input level
spreading under operating
conditions
Z
o
output impedance
f
lf
low frequency roll-off
f
hf
high frequency roll-off
THD
L,R
total harmonic distortion L + R
measured at pin COMP
162
250
363
mV
T
amb
=
20 to +70
°
C; aging;
power supply influence
0.5
+0.5
dB
note 1
25 kHz deviation L + R;
2 dB
25 kHz deviation L + R;
2 dB
f
i
= 1 kHz; 25 kHz deviation
f
i
= 1 kHz; 125 kHz deviation;
note 2
CCIR 468-2 weighted quasi
peak; L + R; 25 kHz deviation;
f
i
= 1 kHz; 75
μ
s de-emphasis
critical picture modulation
with sync only
mono signal: 25 kHz deviation,
f
i
= 1 kHz; side band: SAP
carrier frequency
±
1 kHz
50 Hz to 100 kHz;
mainly n
×
f
H
; no de-emphasis;
L + R; 25 kHz deviation,
f = 1 kHz as reference
100
low-ohmic 5
k
Hz
kHz
%
%
5
0.5
1.5
S/N
signal-to-noise ratio
L + R/noise
44
54
46
dB
dB
dB
α
SB
side band suppression mono
into unmodulated SAP carrier;
SAP carrier/side band
spectral spurious attenuation
L + R/spurious
α
SP
40
dB
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