LMH6552_14 Datasheet, PDF (22/32 Pages) Texas Instruments – 1.5 GHz Fully Differential Amplifier

LMH6552
SNOSAX9H – APRIL 2007 – REVISED MARCH 2013
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357:
100:
50: ^{TWISTED PAIR}
RS = 50:
V_S
a ^61.8:
169:
+
V_CM
-
169:
27.6:
2 V_PP
50:
357:
A_V = 2 V/V
ENABLE
Figure 54. Fully Differential Cable Driver
POWER SUPPLY BYPASSING
The LMH6552 requires supply bypassing capacitors as shown in Figure 55 and Figure 56. The 0.01 µF and 0.1
µF capacitors should be leadless SMT ceramic capacitors and should be no more than 3 mm from the supply
pins. These capacitors should be star routed with a dedicated ground return plane or trace for best harmonic
distortion performance. A small capacitor, ~0.01 µF, placed across the supply rails, and as close to the chip's
supply pins as possible, can further improve HD2 performance. Thin traces or small vias will reduce the
effectiveness of bypass capacitors. Also shown in both figures is a capacitor from the V_CM and ENABLE pins to
ground. These inputs are high impedance and can provide a coupling path into the amplifier for external noise
sources, possibly resulting in loss of dynamic range, degraded CMRR, degraded balance and higher distortion.
10 PF
V⁺
0.1 PF
+
V_CM
-
0.1 PF
0.01 PF
ENABLE
0.1 PF
10 PF
V^-
0.1 PF
Figure 55. Split Supply Bypassing Capacitors
22
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