Datasheet
1k
100k 10M 500M
FREQUENCY (Hz)
-20
20
60
100
GAIN (dB)
100M1M
10k
90
70
40
30
-10
80
10
0
50
PHASE
GAIN
180
144
108
72
36
0
-36
-72
-108
-144
-180
PHASE
(
°
)
0 10 20 30 40 50 60 70 80 90 100
0
10
20
30
40
50
60
70
80
90
100
ISOLATION RESISTANCE, R
ISO
(:)
CAPACITIVE LOAD, C
L
(pF)
R
ISO
25:
C
L
-
+
1 k:
×
100k
1M
10M
100M
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
CROSSTALK REJECTION (dB)
FREQUENCY (Hz)
V
S
= ±5V
LMH6654, LMH6655
www.ti.com
SNOS956D –JUNE 2001–REVISED MARCH 2013
Typical Performance Characteristics (continued)
T
J
= 25°C, V
+
= ±5V, V
−
= −5, R
F
= 25Ω for gain = +1, R
F
= 402Ω and for gain ≥ +2, and R
L
= 100Ω, unless otherwise
specified.
CrossTalk Isolation Resistance
vs. vs.
Frequency (LMH6655 only) Capacitive Load
Figure 40. Figure 41.
Open Loop Gain and Phase
vs.
Frequency
Figure 42.
APPLICATION INFORMATION
GENERAL INFORMATION
The LMH6654 single and LMH6655 dual high speed, voltage feedback amplifiers are manufactured on TI’s new
VIP10™ (Vertically Integrated PNP) complementary bipolar process. These amplifiers can operate from ±2.5V to
±6V power supply. They offer low supply current, wide bandwidth, very low voltage noise and large output swing.
Many of the typical performance plots found in the datasheet can be reproduced if 50Ω coax and 50Ω R
IN
/
ROUT
resistors are used.
CIRCUIT LAYOUT CONSIDERATION
With all high frequency devices, board layouts with stray capacitance have a strong influence on the AC
performance. The LMH6654/LMH6655 are not exception and the inverting input and output pins are particularly
sensitive to the coupling of parasitic capacitance to AC ground. Parasitic capacitances on the inverting input and
output nodes to ground could cause frequency response peaking and possible circuit oscillation. Therefore, the
power supply, ground traces and ground plan should be placed away from the inverting input and output pins.
Also, it is very important to keep the parasitic capacitance across the feedback to an absolute minimum.
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