Isd5100 – series – Rainbow Electronics ISD5100 User Manual
Page 52
ISD5100 – SERIES
- 52 -
ANA IN (Analog Input)
The ANA IN pin is the analog input from the telephone chip set. It can be switched (by the I
2
C
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
I
2
C
interface.
ANA IN Input Modes
ANA IN Amplifier Gain Settings
CFG0
Setting
(1)
0TLP
Input
V
P-P
(3)
AIG1 AIG0
Gain
(2)
Array
In/Out V
P-P
Speaker
Out V
P-P
(4)
6 dB
1.110
0
0
0.625
0.694
2.22
9 dB
0.785
0
1
0.883
0.694
2.22
12 dB
0.555
1
0
1.250
0.694
2.22
15 dB
0.393
1
1
1.767
0.694
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)
Gain
Setting
Resistor
Ration (Rb/Ra)
Gain Gain
2
(dB)
00
63.9 / 102
0.625
-4.1
01
77.9 / 88.1
0.88
-1.1
10
92.3 / 73.8
1.25
1.9
11
106 / 60
1.77
4.9
Note: Ra & Rb are in k
Ω
ANA IN
Input
ANA IN
Input Amplifier
NOTE:
f
CUTTOFF
2xR
a
C
CCUP
1
Ra
Rb
C
COUP =
0.1
ìF
Internal to the device