Preliminary Information
MH88524
MH88524
VIN RX1
RX1
JUN1
TX1
754Ω
RX2
JUN2
754Ω
VOUT
JUN2
TX2
VOUT
TX2
V
DD
AGND
V
EE
Notes
1) In addition to the above test circuit:
Apply VIN JUN1 and measure VOUT TX2 and VOUT JUN1.
Apply VIN JUN2 and measure VOUT TX1 and VOUT JUN1
Apply VIN RX2 and measure VOUT TX1 and VOUT JUN1.
2) All ground connections are star configured (i.e., single
point ground).
+5V
-5V
CT (Crosstalk) calculation
Examples:
CT = 20xlog (VIN RX1/VOUT JUN2)
CT = 20xlog (VIN RX1/VOUT TX2)
Figure 10 - Application Circuit for Crosstalk Test
Analog Signal Input
MH88524
Digital Data Input
(2kHz max)
MT8840
TX0
TXD1
RXD0
VSS
RX1
RX1
TX1
JUN1
AGND
32kHz ASK plus
Analog Input/Output
Digital Data Output
High Pass
Filter
MH88500
TIP
JUNCTOR
GND
RING
Analog Signal Output
Low Pass
Filter
To Telephone Station
Set Input/Output
Notes:
1) See MT8840 data sheet for device details.
2) See MH88500 data sheet for device details. Note that
this device is optional in this applications circuit.
3) High Pass Filter is typically 2nd order 15kHz
4) Low Pass Filter is typically 2nd order 4kHz
Figure 11 - Application Circuit with MT8840, MH88500 and MH88524
2-81
MITEL [ MITEL NETWORKS CORPORATION ]
