THS6032_14 Datasheet, PDF (17/35 Pages) Texas Instruments – LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER

THS6032
www.ti.com....................................................................................................................................................... SLOS233F – APRIL 1999 – REVISED AUGUST 2009
OUTPUT AMPLITUDE
vs
FREQUENCY
4
3
V_CC(H) = ± 15 V
V_CC(L) = ± 5 V
2 ^{Gain = +1}
R_L = 25 Ω
1 VO = 0.2 VRMS
C_i = 2.2 pF
0
−1
−2
−3
C_i = 0 pF
−4
−5
100 k
1M
10 M
100 M 500 M
f − Frequency − Hz
OUTPUT AMPLITUDE
vs
FREQUENCY
4
3
V_CC(H) = ± 15 V
V_CC(L) = ± 5 V
2 ^{Gain = −1}
R_L = 25 Ω
1 VO = 0.2 VRMS
C_i = 27 pF
0
−1
C_i = 0 pF
−2
−3
−4
−5
100 k
1M
10 M
100 M 500 M
f − Frequency − Hz
C_i
V_I
1.3 kΩ
−
+
V_O
25 Ω
50 Ω
1.1 kΩ
1.1 kΩ
V_I
−
50 Ω
+
V_O
C_i
R_L = 25 Ω
Figure 41.
Figure 42.
• Proper power supply decoupling – Use a minimum of a 6.8-μF tantalum capacitor in parallel with a 0.1-μF
ceramic capacitor on each supply terminal. It may be possible to share the tantalum capacitor among several
amplifiers depending on the application, but a 0.1-μF ceramic capacitor should always be used on the supply
terminal of every amplifier. In addition, the 0.1-μF capacitor should be placed as close as possible to the
supply terminal. As this distance increases, the inductance in the connecting etch makes the capacitor less
effective. The designer should strive for distances of less than 0.1 inches between the device power terminal
and the ceramic capacitors.
• Differential power supply decoupling – The THS6032 was designed to drive low-impedance differential
signals. The 25-Ω load that each amplifier drives causes large amounts of current to flow from amplifier to
amplifier. Power-supply decoupling for differential-currents must be provided to ensure low distortion in the
THS6032. By simply connecting a 0.1-μF ceramic capacitor from the +V_CC(H) pin to the –V_CC(H) pin, along with
another 0.1-μF ceramic capacitor from the +V_CC(L) pin to the –V_CC(L) pin, differential current loops will be
minimized (see Figure 36). This will help keep the THS6032 operating at peak performance.
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