MH88620BR
Preliminary Information
Transmit Gain (dB)
2-Wire to Tx 20log
(Tx/2-Wire)
RTX Resistor (1%)
Notes
Value (Ω)
+6.0
+4.0
No Resistor
38.3k
Results in 0dB overall gain when used with
Mitel A-law codec (i.e. MT8965)
+3.7
0.0
32.4k
Connect GTX0 to GTX1
-3.0
5.49k
3.32k
1.43k
-6.0
-12.0
Note 1. Overall gain refers to the receive path of PCM to 2-Wire.
Note 2 See Figure 2 for Application Circuit.
Receive Gain (dB)
Rx to 2-Wire 20log
(2-Wire/ Rx)
RRX Resistor (1%)
Notes
Value (Ω)
+6.0
0.0
No Resistor
Connect GRX0 to GRX1
+3.0
-3.7
-4.0
5.49k
4.87k
4.64k
Results in 0dB overall gain when used with
Mitel A-law codec (i.e. MT8965)
-6.0
3.32k
1.43k
-12.0
Note 1. Overall gain refers to the receive path of PCM to 2-Wire.
Note 2. See Figure 2 for Application Circuit.
70
60
ILoop
45
Constant
Voltage
Region
(mA)
30
15
0
Constant
Current
Region
1kΩ
2kΩ
RLoop (ohms)
Graph 1 - ILoop/RLoop Characteristics
2-150
MITEL [ MITEL NETWORKS CORPORATION ]
