ISD5100 – SERIES
ANA IN (Analog Input)
The ANA IN pin is the analog input from the telephone chip set. It can be switched (by the I2C
interface) to the speaker output, the array input or to various other paths. This pin is designed to
accept a nominal 1.11 V p-p when at its minimum gain (6 dB) setting. There is additional gain
available, if required, in 3 dB steps, up to 15 dB. The gain settings are controlled from the I2C
interface.
ANA IN Input Modes
Gain
Resistor
Gain
Gain2
(dB)
Setting Ration (Rb/Ra)
CCOUP = 0.1 ìF
00
01
10
11
63.9 / 102
77.9 / 88.1
92.3 / 73.8
106 / 60
0.625
0.88
1.25
1.77
-4.1
-1.1
1.9
ANA IN
Input
ANA IN
Input Amplifier
4.9
Note: Ra & Rb are in kΩ
NOTE: fCUTTOFF
2xRaCCCUP
ANA IN Amplifier Gain Settings
CFG0
Gain(2)
Setting(1)
0TLP I(n3p) ut
Array
Speaker
(4)
VP-P
In/Out VP-P Out VP-P
AIG1
AIG0
6 dB
9 dB
12 dB
15 dB
1.110
0.785
0.555
0.393
0
0
1
1
0
1
0
1
0.625
0.883
1.250
1.767
0.694
0.694
0.694
0.694
2.22
2.22
2.22
2.22
1. Gain from ANA IN to SP+/-
2. Gain from ANA 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. Speaker Out gain set to 1.6 (High). (Differential)
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