AS3525-A/-B C22O22
Data Sheet, Confidential
7.4.5
Audio Line Output
7.4.5.1 General
The line output is designed to provide the audio signal with typical 1Vp at a load of minimum 10kΩ, which is a minimum value for line inputs.
Additional this output amplifier is capable to drive a 32Ω load (e.g. an earpiece of a mobile phone). To achieve this operation mode can be
switched from single ended stereo to mono differential.
This output stage has an independent gain regulation for left and right channel with 32 steps @ 1.5dB each. The gain can be set from -40.5dB to
+6dB. Changing of volume and mute control can only be done after enabling the output.
If using the output in mono differential mode, the volume setting for the right channel should be set to 0dB.
Figure 49 Line Output
Stereo Mode
Mono Differential Mode (please observe that gain of right
channel amplifier has to best to 0dB)
7.4.5.2 Parameter
Table 107 Line Output Characteristics
Symbol
RL
Parameter
Output Load
Notes
Min
Typ
Max Unit
stereo mode
10k
Ohm
differential mode
32
Ohm
A0
Gain
programmable gain
-40.5
6
dB
dB
dB
dB
Gain Step-Size
Signal to Noise Ratio
Mute Attenuation
1.5
Ax
SNR
stereo mode
90
120
BVDD = 3.3V, TA= 25oC unless otherwise mentioned
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