Philips CEM5000/00 Service Manual page 39

TDA7419
Table 6. Electrical Characteristcs (continued)
V = 8.5V; T = 25°C; R
S amb
Symbol Parameter
GENERAL
e Output Noise
NO
S/N Signal to Noise Ratio
D Distortion
S Channel Separation left/right
C
5 DESCRIPTION OF THE AUDIOPROCESSOR
5.1 Input stages
In the basic configuration, one stereo quasi-differential and three (two in case of DSO applications) single
ended stereo inputs are available.
5.1.1 Quasi-differential stereo Input (QD)
The QD input is implemented as a buffered quasi-differential stereo stage with 100k input-impedance at
each input. The attenuation is fixed to -3dB in order to adapt the incoming signal level.
5.1.2 Single-ended stereo input (SE1, SE2, SE3/AC2IN)
The input-impedance at each input is 100k and the attenuation is fixed to -3dB for incoming signals. The
input for SE3 is also configurable as part of the interface for external filters in DSO applications (AC2IN)
Figure 4. Input Stage
QD_L
QD_G
QD_R
SE1_L
SE1_R
SE2_L
SE2_R
AC2IN_L/SE3L
AC2IN_R/SE3R
8/30
= 10kΩ ; all gains = 0dB; f = 1kHz; unless otherwise specified
L
BW=20Hz to 20 kHz all gain =
0dB
BW=20Hz to 20 kHz Output
muted
all gain = 0dB flat; V
V = 1V
IN
QD
QD
SE4
SE1
SE1
SE2
SE2
SE3
SE3
Test Condition
=2V
o RMS
; all stages 0dB
RMS
Main
Source
Second
Source
Min. Typ. Max.
12
6
100
0.01
90
In Gain
Output Stage
Unit
µV
µV
dB
%
dB