Datasheet
Receive Path Implementation
3-7
THS6043EVM Applications
3.5 Receive Path Implementation
Test points TP1 through TP4 are located on the EVM to facilitate the addition
of the receive signal path to the signal chain as shown in Figure 3−5. When
implementing the receive path, a hybrid must be used since ADSL is full
duplex. The hybrid cancels out the TX signal and allows the RX signal from the
line to come through. The THS6043EVM does not include receive or hybrid
circuitry. Texas Instruments assumes that customers prefer to implement their
own propriety hybrid design. This makes sense as each customer knows their
nominal line impedance characteristics, and is able to match them better.
Texas Instruments does have an EVM that contains a THS6062 ADSL
receiver, and this EVM can be purchased separately to facilitate construction
of a complete ADSL transmit/receive interface.
Figure 3−5. Implementation of the Receive Signal Path
210 W
R17
2R
Line =
V Line
R5
R12
R
R18
R7
R16
+V
R19
J1
IN1
C3
C5
RX Vout−
TP4
Vout−
1:n
R6
−
+
U2A
THS6062
2
3
1
8
4
Z1
0
+V
TP3
TX Vo−
Z2
0
RX Vout+
R
J2
IN2
−V
R1
TP2
Vout+
+
−
U1A
THS6043
2
3
1
14
4
R
R23
0
+
−
U1B
THS6043
12
11
13
+
−
U2B
THS6062
6
5
7
J6
RX Vin+
TP1
TX Vo+
J7
RX Vin−
R24
0
−V
R
2R
R11
49.9 W
1 mF
49.9 W
750 W
49.9 W
49.9 W
750 W
100 W