LMH6601MG/NOPB National Semiconductor, LMH6601MG/NOPB Datasheet - Page 18

• Manufacturer Part Number: LMH6601MG/NOPB
• Description: IC AMP VFA 2.4V SHUTDOWN SC70-6
• Manufacturer: National Semiconductor

Specifications of LMH6601MG/NOPB

• Amplifier Type: Voltage Feedback
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Slew Rate: 275 V/µs
• Gain Bandwidth Product: 155MHz
• -3db Bandwidth: 250MHz
• Current - Input Bias: 5pA
• Voltage - Input Offset: 1000µV
• Current - Supply: 9.6mA
• Current - Output / Channel: 180mA
• Voltage - Supply, Single/dual (±): 2.4 V ~ 5.5 V, ±1.2 V ~ 2.75 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SC-70-6, SC-88, SOT-363
• Number Of Channels: 1
• Voltage Gain Db: 66 dB
• Common Mode Rejection Ratio (min): 56 dB
• Input Offset Voltage: 2.4 mV at 5 V
• Operating Supply Voltage: 3 V, 5 V
• Supply Current: 11.5 mA at 5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• For Use With: LMH730227 - BOARD EVALUATION FOR SOIC PKGLMH730165 - BOARD EVALUATIONLMH730216 - BOARD EVAL HS MONO AMP SOT23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LMH6601MG; LMH6601MGTR

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OVERLOAD RECOVERY AND SWING CLOSE TO RAILS
The LMH6601 can recover from an output overload in less
than 20 ns. See
photos:
In
driven to one rail and then the other and then the output re-
covery is measured from the time the input crosses 0V to
when the output reaches this point.
Also, when the LMH6601 input voltage range is exceeded
near the V
reversal, as some op amps do. This is particularly advanta-
geous in applications where output phase reversal has to be
avoided at all costs, such as in servo loop control among oth-
ers. This adds to the LMH6601’s set of features which make
this device easy to use.
In addition, the LMH6601’s output swing close to either rail is
well-behaved as can be seen in the scope photo of
Figure
FIGURE 4. LMH6601’s “Clean” Swing to Either Rail
FIGURE 3. LMH6601 Output Overload Recovery
3, the input step function is set so that the output is
+
rail, the output does not experience output phase
Figure 3
below for the input and output scope
Waveform
20136407
20136443
Figure
4.
18
With some op amps, when the output approaches either one
or both rails and saturation starts to set in, there is significant
increase in the transistor parasitic capacitances which leads
to loss of Phase Margin. That is why with these devices, there
are sometimes hints of instability with output close to the rails.
With the LMH6601, as can be seen in
waveform remains free of instability throughout its range of
voltages.
SINGLE SUPPLY VIDEO APPLICATION
The LMH6601’s high speed and fast slew rate make it an ideal
choice for video amplifier and buffering applications. There
are cost benefits in having a single operating supply. Single
supply video systems can take advantage of the LMH6601’s
low supply voltage operation along with its ability to operate
with input common mode voltages at or slightly below the V
−
or reducing the value of the input and output AC coupling ca-
pacitors commonly employed in single supply video applica-
tions. This Application section shows some circuit techniques
used to help in doing just that.
DC COUPLED, SINGLE SUPPLY BASEBAND VIDEO
AMPLIFIER/DRIVER
The LMH6601 output can swing very close to either rail to
maximize the output dynamic range which is of particular in-
terest when operating in a low voltage single supply environ-
ment. Under light output load conditions, the output can swing
as close as a few milli-volts of either rail. This also allows a
video amplifier to preserve the video black level for excellent
video integrity. In the example shown below in
baseband video output is amplified and buffered by the
LMH6601 which then drives the 75Ω back terminated video
cable for an overall gain of +1 delivered to the 75Ω load. The
input video would normally have a level between 0V to ap-
proximately 0.75V.
rail. Additional cost savings can be achieved by eliminating
FIGURE 5. Single Supply Video Driver Capable of
Maintaining Accurate Video Black Level
Figure
4, the output
Figure
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5, the