TDA7419

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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

Spectrum Analyzer Repeat Time

50

ms

Internal Reset Time

4.5

ms

GENERAL

Output Noise

BW=20Hz to 20 kHz all gain =

0dB

12

20

µV

BW=20Hz to 20 kHz Output

muted

615

µV

S/N

Signal to Noise Ratio

100

dB

DDistortion

0.01

0.1

%

Channel Separation left/right

80

90

dB

Table 6. Electrical Characteristcs (continued)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Output Stage

QD

QD_L

QD_R

QD_G

SE3

SE2

SE2_L

SE2_R

QD

SE1

SE2

SE3

Main

Source

Second

Source

In Gain

SE1

SE1_L

SE1_R

AC2IN_L/SE3L

AC2IN_R/SE3R

SE4