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LMH6720 Datasheet(PDF) 10 Page - Texas Instruments

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Part # LMH6720
Description  LMH6714/ LMH6720/ LMH6722/ LMH6722Q Wideband Video Op Amp; Single, Single
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LMH6720 Datasheet(HTML) 10 Page - Texas Instruments

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1
2
3
4
5
6
7
8
9
10
0
100
200
300
400
500
600
700
GAIN (V/V)
1
10
100
1000
FREQUENCY (MHz)
-8
-7
-6
-5
-4
-3
-2
-1
0
1
RF = 400:
RF = 600:
RF = 147:
RF = 300:
AV = 2V/V
VOUT = 0.5VPP
LMH6714, LMH6720
LMH6722, LMH6722-Q1
SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013
www.ti.com
APPLICATION SECTION
FEEDBACK RESISTOR SELECTION
One of the key benefits of a current feedback operational amplifier is the ability to maintain optimum frequency
response independent of gain by using appropriate values for the feedback resistor (RF). The Electrical
Characteristics and Typical Performance plots specify an RF of 300Ω, a gain of +2V/V and ±5V power supplies
(unless otherwise specified). Generally, lowering RF from it's recommended value will peak the frequency
response and extend the bandwidth while increasing the value of RF will cause the frequency response to roll off
faster. Reducing the value of RF too far below it's recommended value will cause overshoot, ringing and,
eventually, oscillation.
Figure 31. Frequency Response vs. RF
Figure 31 shows the LMH6714/LMH6720/LMH6722's frequency response as RF is varied (RL = 100Ω, AV = +2).
This plot shows that an RF of 147Ω results in peaking. An RF of 300Ω gives near maximal bandwidth and gain
flatness with good stability. An RF of 400Ω gives excellent stability with only a small bandwidth penalty. Since all
applications are slightly different it is worth some experimentation to find the optimal RF for a given circuit. Note
that it is not possible to use a current feedback amplifier with the output shorted directly to the inverting input.
The buffer configuration of the LMH6714/LMH6720/LMH6722 requires a 600
Ω feedback resistor for stable
operation.
For more information see Application Note OA-13 (SNOA366) which describes the relationship between RF and
closed-loop frequency response for current feedback operational amplifiers. The value for the inverting input
impedance for the LMH6714/LMH6720/LMH6722 is approximately 180
Ω. The LMH6714/LMH6720/LMH6722 is
designed for optimum performance at gains of +1 to +6 V/V and
−1 to −5V/V. When using gains of ±7V/V or
more the low values of RG required will make inverting input impedances very low.
When configuring the LMH6714/LMH6720/LMH6722 for gains other than +2V/V, it is usually necessary to adjust
the value of the feedback resistor. Figure 32 and Figure 33 provide recommended feedback resistor values for a
number of gain selections.
Figure 32. RF vs. Non-Inverting Gain
10
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Copyright © 2002–2013, Texas Instruments Incorporated
Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1


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