THS6022_16 Datasheet, PDF (27/44 Pages) Texas Instruments – 250-mA DUAL DIFFERENTIAL LINE DRIVER

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THS6022
SLOS225D – SEPTEMBER 1998 – REVISED JULY 2007
SLEW RATE—SATURATION
16
SLEW RATE—LINEAR
16
12
12
8
8
4
4
0
0
−4
−8
−12
−16
0
SR ≅ 1300 V/µs
V_CC = ±15 V
Gain = 5
R_F = 1 kΩ
R_L = 50 Ω
t_r/t_f = 10 ns
10 20 30 40 50 60 70 80 90 100
t − Time − ns
G048
Figure 53.
−4
−8
−12
−16
0
SR = 3500 V/µs
V_CC = ±15 V
Gain = 5
R_L = 1 kΩ
R_F = 50 Ω
t_r/t_f = 900 ns
10 20 30 40 50 60 70 80 90 100
t − Time − ns
G049
Figure 54.
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 THS6022 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 decreases the device 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 15 Ω should work well for most applications. For
example, in 75-Ω transmission systems, setting the series resistor value to 75 Ω both isolates any capacitance
loading and provides the proper line impedance matching at the source end.
1 kW
Input
1 kW
_
THS6022
+
15 W
Output
C_LOAD
Figure 55. Driving a Capacitive Load
S0278-02
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