LMH6657 Datasheet, PDF (17/29 Pages) National Semiconductor (TI) – 270MHz Single Supply, Single & Dual Amplifiers

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10
V_S = ±5V
25°C
LMH6657, LMH6658
SNOSA35F – AUGUST 2002 – REVISED MARCH 2013
1 20mV
500mV
0.1
0
50
100
150
200
I_OUT (mA)
Figure 53. V_OUT vs. I_SOURCE (for Various Overdrive)
10
V_S = ±5V
25°C
1 ^-20mV
-500mV
0.1
0
50
100 150 200 250
I_OUT (mA)
Figure 54. V_OUT vs. I_SINK (for Various Overdrive)
The LMH6657/6658 output stage is designed to swing within approximately one diode drop of each supply
voltage by utilizing specially designed high speed output clamps. This allows adequate output voltage swing
even with 5V supplies and yet avoids some of the issues associated with rail-to-rail output operational amplifiers.
Some of these issues are:
• Supply current increases when output reaches saturation at or near the supply rails
• Prolonged recovery when output approaches the rails
The LMH6657/6658 output is exceedingly well-behaved when it comes to recovering from an overload condition.
As can be seen from Figure 55 below, the LMH6657/6658 will typically recover from an output overload condition
in about 18ns, regardless of the duration of the overload.
OUTPUT
INPUT
V_S = ±5V, A_V = +6, R_F = 1k
R_G = 200: R_L = OPEN
20 ns/DIV
Figure 55.
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Product Folder Links: LMH6657 LMH6658
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