ISD5100 – SERIES
AUX IN (Auxiliary Input)
The AUX IN is an additional audio input to the ISD5100-Series, such as from the microphone circuit in
a mobile phone “car kit.” This input has a nominal 694 mV p-p level at its minimum gain setting (0 dB).
See the AUX IN Amplifier Gain Settings table on page 56. Additional gain is available in 3 dB
steps (controlled by the I2C interface) up to 9 dB.
AUX IN Input Modes
CCOUP = 0.1 ìF
Gain
Resistor Ratio
(Rb/Ra)
Gain
Gain(2)
(dB)
AUX IN
Input
Setting
00
01
10
11
40.1 / 40.1
47.0 / 33.2
53.5 / 26.7
59.2 / 21
1.0
1.414
2.0
0
3
6
9
ANA IN
Input Amplifier
2.82
Note: Ra & Rb are in kΩ
NOTE: fCUTTOFF
2xRaCCCUP
AUX IN Amplifier Gain Settings
Setting(1)
0TLP I(n3p) ut
CFG0
Gain(2)
Array
Speaker
(4)
VP-P
In/Out VP-P Out VP-P
AXG1
AXG0
0 dB
3 dB
6 dB
9 dB
0.694
0.491
0.347
0.245
0
0
1
1
0
1
0
1
1.00
1.41
2.00
2.82
0.694
0.694
0.694
0.694
0.694
0.694
0.694
0.694
1.
2.
Gain from AUX IN to ANA OUT
Gain from AUX IN to ARRAY IN
3. 0TLP Input is the reference Transmission Level Point that is used for testing. This level is typically 3 dB
below clipping
4.
Differential
Publication Release Date: October, 2003
Revision 0.2
- 53 -
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