
AS3515 V15
austriamicrosystems
Data Sheet, Confidential
www.austriamicrosystems.com
Revision 3.1
19
- 66
6.5
Line Inputs (2x)
6.5.1
General
AS3515 includes two identical line inputs. The blocks can work in mono differential, 2x mono single ended or in stereo single ended mode.
The volume control has an independent gain regulation for left and right channel with 32 steps @ 1.5dB each. The gain can be set from –
34.5dB to +12dB. The stage is set to mute by default. If the line input is not enabled, the volume settings are set to their default values.
Changing the volume and mute control can only be done after enabling the input.
If using the inputs as mono differential, the volume setting for the right channel should be set to 0dB.
Figure 6 Line Input
6.5.2
Parameter
Figure 7 Line Input Parameter
Symbol Parameter
Notes
Min
Typ
Max
Unit
A0
Gain
programmable gain
-34.5
12
dB
Ax
Gain Step-Size
1.5
dB
Gain Step-Precision
0.5
dB
Mute
49
kOhm
RinLINE
Input Resistance
Min Gain, single ended stereo
100
kOhm
SNR
Signal to Noise Ratio
100
dB
Mute Attenuation
100
dB
BVDD = 3.3V, TA= 25oC, fs=48kHz unless otherwise mentioned
6.5.3
Register Description
Enabling a line-input is done via a control bit in the audio settings register (AudioSet1 register 0x14h). All other line input settings are
controlled by the following registers.
Right Line In Registers (0Ah & 0Ch)
Table 18 LINE_IN1_R & LINE_IN2_R Register
Bit
Name
Description
7,6
-
5
LI1R_Mute_off
LI2R_Mute_off
0: right line input is set to mute
1: normal operation
4..0
LI1R_VOL
LI2R_VOL
volume settings for right line input, adjustable in 32 steps @ 1.5dB
11111: 12 dB gain
11110: 10.5 dB gain
..
00001: -33 dB gain
00000: -34.5 dB gain
The registers are R/W; default value is 00h
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