THS6022_16 Datasheet, PDF (31/44 Pages) Texas Instruments – 250-mA DUAL DIFFERENTIAL LINE DRIVER

THS6022
www.ti.com
SLOS225D – SEPTEMBER 1998 – REVISED JULY 2007
ADSL
The THS6022 was primarily designed as a line driver and line receiver for ADSL (asymmetrical digital subscriber
line). The driver output stage has been sized to provide full ADSL power levels of 13 dBm onto the telephone
lines. Although actual driver output peak voltages and currents vary with each particular ADSL application, the
THS6022 is specified for a minimum full output current of 200 mA at its full output voltage of approximately 12 V.
This performance meets the demanding needs of ADSL at the client side end of the telephone line. A typical
ADSL schematic is shown in Figure 60
15 V
THS6022
Driver 1
V_I+
+
_
0.1 mF
+
6.8 mF
1 kW
1 kW
-15 V
0.1 mF
15 V
THS6022
Driver 2
V_I-
+
_
0.1 mF
6.8 mF
+
+
6.8 mF
1 kW
1 kW
–15 V
0.1 mF
6.8 mF
+
50 W
50 W
1:1
Telephone Line
100 W
2 kW
1 kW
2 kW
1 kW
1 kW
15 V
0.1 mF
–
V_O+
+
THS6062
Receiver 1
–15 V
1 kW
15 V
0.1 mF
–
V_O–
+ _THS6062
Receiver 2
–15 V
0.01 mF
Figure 60. THS6022 ADSL Application
S0287-01
The ADSL transmit band consists of 255 separate carrier frequencies each with its own modulation and
amplitude level. With such an implementation, it is imperative that signals put onto the telephone line have as
low a distortion as possible. This is because any distortion either interferes directly with other ADSL carrier
frequencies or it creates intermodulation products that interfere with ADSL carrier frequencies.
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