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PDF LMH6733 Data sheet ( Hoja de datos )
| Número de pieza | LMH6733 | |
| Descripción | Triple Operational Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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www.DataSheet4U.com
January 2007
LMH6733
Single Supply, 1.0 GHz, Triple Operational Amplifier
General Description
The LMH6733 is a triple, wideband, operational amplifier de-
signed specifically for use where high speed and low power
are required. Input voltage range and output voltage swing
are optimized for operation on supplies as low as 3V and up
to ±6V. Benefiting from National’s current feedback architec-
ture, the LMH6733 offers a gain range of ±1 to ±10 while
providing stable operation without external compensation,
even at unity gain. These amplifiers provide 650 MHz small
signal bandwidth at a gain of 2 V/V , a low 2.1 nV/ input
referred noise and only consume 5.5 mA (per amplifier) from
a single 5V supply.
The LMH6733 is offered in a 16-Pin SSOP package with flow
through pinout for ease of layout and is also pin compatible
with the LMH6738. Each amplifier has an individual shutdown
pin.
Features
■ Supply range 3 to 12V single supply
■ Supply range ±1.5V to ±6V split supply
■ 1.0 GHz −3 dB small signal bandwidth
(AV = +1, VS = ±5V)
■ 650 MHz −3 dB small signal bandwidth
(AV = +2, VS = 5V)
■ Low supply current (5.5 mA per op amp, VS = 5V)
■ 2.1 nV/ input noise voltage
■ 3750 V/μs slew rate
■ 70 mA linear output current
■ CMIR and output swing to 1V from each supply rail
Applications
■ HDTV component video driver
■ High resolution projectors
■ Flash A/D driver
■ D/A transimpedance buffer
■ Wide dynamic range IF amp
■ Radar/communication receivers
■ DDS post-amps
■ Wideband inverting summer
■ Line driver
Connection Diagram
16-Pin SSOP
Top View
20199110
Ordering Information
Package
16-pin SSOP
Part Number
LMH6733MQ
LMH6733MQX
VIP10™ is a trademark of National Semiconductor Corporation.
Package Marking
LH6733MQ
© 2007 National Semiconductor Corporation 201991
Transport Media
95 Units/Rail
2.5k Units Tape and Reel
NSC Drawing
MQA16
www.national.com
1 page  
Typical Performance Characteristics AV = +2, VCC = 5V, RL = 100Ω, RF = 340Ω; unless otherwise
specified).
Large Signal Frequency Response
Large Signal Frequency Response
20199111
Small Signal Frequency Response
20199112
Frequency Response vs. VOUT
20199113
Frequency Response vs. Supply Voltage
Gain Flatness
20199114
20199115
5
20199116
www.national.com
5 Page 
Application Information
20199105
FIGURE 1. Recommended Non-Inverting Gain Circuit
20199106
FIGURE 2. Recommended Inverting Gain Circuit
GENERAL INFORMATION
The LMH6733 is a high speed current feedback amplifier, op-
timized for very high speed and low distortion. The LMH6733
has no internal ground reference so single or split supply con-
figurations are both equally useful.
FEEDBACK RESISTOR SELECTION
One of the key benefits of a current feedback operational am-
plifier is the ability to maintain optimum frequency response
independent of gain by using the appropriate values for the
feedback resistor (RF). The Electrical Characteristics and
Typical Performance plots specify an RF of 340Ω, a gain of
+2 V/V and ±2.5V power supplies (unless otherwise speci-
fied). Generally, lowering RF from its 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 its
recommended value will cause overshoot, ringing and, even-
tually, oscillation.
20199103
FIGURE 3. Recommended RF vs. Gain
See Figure 3 for selecting a feedback resistor value for gains
of ±1 to ±10. Since each application is slightly different it is
worth some experimentation to find the optimal RF for a given
circuit. In general a value of RF that produces about 0.1 dB of
peaking is the best compromise between stability and maxi-
mal bandwidth. Note that it is not possible to use a current
feedback amplifier with the output shorted directly to the in-
verting input. The buffer configuration of the LMH6733 re-
quires a 324Ω feedback resistor for stable operation.
The LMH6733 has been optimized for high speed operation.
As shown in Figure 3 the suggested value for RF decreases
for higher gains. Due to the impedance of the input buffer
there is a practical limit for how small RF can go, based on the
lowest practical value of RG. This limitation applies to both
inverting and non-inverting configurations. For the LMH6733
the input resistance of the inverting input is approximately
30Ω and 20Ω is a practical (but not hard and fast) lower limit
for RG. The LMH6733 begins to operate in a gain bandwidth
limited fashion in the region where RG is nearly equal to the
input buffer impedance. Note that the amplifier will operate
with RG values well below 20Ω, however results may be sub-
stantially different than predicted from ideal models. In par-
ticular the voltage potential between the inverting and non-
inverting inputs cannot be expected to remain small.
Inverting gain applications that require impedance matched
inputs may limit gain flexibility somewhat (especially if maxi-
mum bandwidth is required). The impedance seen by the
source is RG || RT (RT is optional). The value of RG is RF /gain.
Thus for an inverting gain of −5 V/V and an optimal value for
RF the input impedance is equal to 55Ω. Using a termination
resistor this can be brought down to match a 25Ω source;
however, a 150Ω source cannot be matched. To match a
150Ω source would require using a 1050Ω feedback resistor
and would result in reduced bandwidth.
For more information see Application Note OA-13 which de-
scribes the relationship between RF and closed-loop frequen-
cy response for current feedback operational amplifiers. The
value for the inverting input impedance for the LMH6733 is
approximately 30Ω. The LMH6733 is designed for optimum
performance at gains of +1 to +10 V/V and −1 to −9 V/V.
Higher gain configurations are still useful; however, the band-
width will fall as gain is increased, much like a typical voltage
feedback amplifier.
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| PDF Descargar | [ Datasheet LMH6733.PDF ] | |
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