MH88620BR
Loop Current
20
25
30
35
40
45
50
55
60
65
70
LCA Pin Connection
Connect 10kΩ from LCA to +5V.
Connect 16kΩ from LCA to +5V.
Connect 36kΩ from LCA to +5V.
Leave LCA open circuit
Connect 24kΩ from LCA to -5V
Connect 10kΩ from LCA to -5V
Connect 5.6kΩ from LCA to -5V
Connect 2.4kΩ from LCA to -5V
Connect 1.3kΩ from LCA to -5V
Connect 680kΩ from LCA to -5V
Connect LCA to -5V
Table 5 - Loop Current Setting
Preliminary Information
Reference Fig #
5a
5a
5a
5c
5b
5b
5b
5b
5b
5b
5d
MH88620BR
N1
10 x
NETBAL
N1
N2
RP
R Internal
9000
Ω
CP
RS
Z
in
= 0.1 x
1
[
RS+ 1/RP + (S x CP)
]
where S = j x w
and w = 2 x JC x f
Notes:
1) The 10xZin network must be set to 10 x the desired input Zin (impedance)
.
2) The 10 x NETBAL network must be set to10x the desired network balance.
3) Make connection between N1 and component as short as possible
.
Example
:
If RS =0Ω
,
RP = 800Ω, CP=.5nf
Then the network balance is 800Ω in
parallel with 50nF.
Figure 4 - External Network Balance Setting
+5V
R
LCA
LCA
LCA
LCA
-5V
-5V
5a
5b
5c
5d
Figure 5 - Loop Current Setting
2-154
MITEL [ MITEL NETWORKS CORPORATION ]
