THS6032 Datasheet, PDF (28/31 Pages) Texas Instruments – LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER

THS6032
LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER
SLOS233C – APRIL1999 – REVISED MARCH 2000
APPLICATION INFORMATION
general configurations (continued)
1.1 kΩ
1.1 kΩ
1/2 THS6032
–
VI
+
75 Ω
75 Ω
75 Ω Transmission Line
N Lines
75 Ω
75 Ω
75 Ω
VO1
VON
Figure 54. Video Distribution Amplifier Application
driving a capacitive load
Driving capacitive loads with high performance amplifiers is not a problem as long as certain precautions are
taken. The first is to realize that the THS6032 has been internally compensated to maximize its bandwidth and
slew rate performance. When the amplifier is compensated in this manner, capacitive loading directly on the
output will decrease the device’s phase margin leading to high frequency ringing or oscillations. Therefore, for
capacitive loads of greater than 10 pF, it is recommended that a resistor be placed in series with the output of
the amplifier, as shown in Figure 55. A minimum value of 10 Ω should work well for most applications. For
example, in ADSL systems, setting the series resistor value to 12.5 Ω both isolates any capacitance loading
and provides the proper line impedance matching at the source end.
1.1 kΩ
Input
1.1 kΩ
_
THS6032
+
10 Ω
Output
CLOAD
Figure 55. Driving a Capacitive Load
evaluation board
Evaluation boards are available for the THS6032. Each board has been configured for proper thermal
management of the THS6032 depending on package selection. The circuitry has been designed for a typical
ADSL application as shown previously in this document. To order the evaluation board, contact your local TI
sales office or distributor.
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