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PDF LMH6722Q Data sheet ( Hoja de datos )
| Número de pieza | LMH6722Q | |
| Descripción | Wideband Video Op Amp | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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LMH6714/ LMH6720/
LMH6722/ LMH6722Q
October 20, 2009
Wideband Video Op Amp; Single, Single with Shutdown
and Quad
General Description
The LMH6714/LMH6720/LMH6722 series combine
National's VIP10™ high speed complementary bipolar pro-
cess with National's current feedback topology to produce a
very high speed op amp. These amplifiers provide a 400MHz
small signal bandwidth at a gain of +2V/V and a 1800V/μs
slew rate while consuming only 5.6mA from ±5V supplies.
The LMH6714/LMH6720/LMH6722 series offer exceptional
video performance with its 0.01% and 0.01° differential gain
and phase errors for NTSC and PAL video signals while driv-
ing a back terminated 75Ω load. They also offer a flat gain
response of 0.1dB to 120MHz. Additionally, they can deliver
70mA continuous output current. This level of performance
makes them an ideal op amp for broadcast quality video sys-
tems.
The LMH6714/LMH6720/LMH6722's small packages (SOIC,
SOT23 and LLP), low power requirement, low noise and dis-
tortion allow the LMH6714/LMH6720/LMH6722 to serve
portable RF applications. The high impedance state during
shutdown makes the LMH6720 suitable for use in multiplex-
ing multiple high speed signals onto a shared transmission
line. The LMH6720 is also ideal for portable applications
where current draw can be reduced with the shutdown func-
tion.
Features
■ 400MHz (AV = +2V/V, VOUT = 500mVPP) −3dB BW
■ 250MHz (AV = +2V/V, VOUT = 2VPP) -3dB BW
■ 0.1dB gain flatness to 120MHz
■ Low power: 5.6mA
■ TTL compatible shutdown pin (LMH6720)
■ Very low diff. gain, phase: 0.01%, 0.01° (LMH6714)
■ −58 HD2/ −70 HD3 at 20MHz
■ Fast slew rate: 1800V/μs
■ Low shutdown current: 500uA (LMH6720)
■ 11ns turn on time (LMH6720)
■ 7ns shutdown time (LMH6720)
■ Unity gain stable
■ Improved replacement for CLC400,401,402,404,406 and
446 (LMH6714)
■ Improved replacement for CLC405 (LMH6720)
■ Improved replacement for CLC415 (LMH6722)
■ LMH6722QSD is AEC-Q100 grade 1 qualified and is
manufactured on an automotive grade flow
Applications
■ HDTV, NTSC & PAL video systems
■ Video switching and distribution
■ Wideband active filters
■ Cable drivers
■ High speed multiplexer (LMH6720)
■ Programmable gain amplifier (LMH6720)
■ Automotive (LMH6722)
Typical Performance
Differential Gain and Phase vs. Number of Video Loads
(LMH6714)
Non-Inverting Small Signal Frequency Response
20056506
VIP10™ is a trademark of National Semiconductor Corporation.
© 2009 National Semiconductor Corporation 200565
20056528
www.national.com
1 page  
Typical Performance Characteristics (V+ = +5V, V− = −5V, AV = 2, RF = 300Ω, RL = 100Ω Unless
Specified).
Non-Inverting Small Signal Frequency Response
Non-Inverting Large Signal Frequency Response
20056506
Inverting Frequency Response
20056507
Non-Inverting Frequency Response vs. VO
20056503
Inverting Frequency Response vs. VO
20056508
Harmonic Distortion vs. Frequency
20056509
5
20056504
www.national.com
5 Page 
WIDE BAND DIGITAL PROGRAMMABLE GAIN AMPLIFIER (LMH6720 ONLY)
FIGURE 6. Wideband Digitally Controlled Programmable Gain Amplifier
Channel Switching
20056519
20056520
FIGURE 7. PGA Output
As shown in Figure 6 and Figure 7 the LMH6720 can be used
to construct a digitally controlled programmable gain amplifi-
er. Each amplifier is configured to provide a digitally se-
lectable gain. To provide for accurate gain settings, 1% or
AMPLITUDE EQUALIZATION
Sending signals over coaxial cable greater than 50 meters in
length will attenuate high frequency signal components much
more than lower frequency components. An equalizer can be
made to pre emphasize the higher frequency components so
that the final signal has less distortion. This process can be
done at either end of the cable. The circuit in Figure 8 shows
a receiver with some additional components in the feedback
loop to equalize the incoming signal. The RC networks peak
the signal at higher frequencies. This peaking is a piecewise
linear approximation of the inverse of the frequency response
of the coaxial cable. Figure 9 shows the effect of this equal-
ization on a digital signal that has passed through 150 meters
of coaxial cable. Figure 10 shows a Bode plot of the frequency
better tolerance is recommended on the feedback and gain
resistors. The gain provided by each digital code is arbitrary
through selection of the feedback and gain resistor values.
response of the circuit in Figure 8 along with equations need-
ed to design the pole and zero frequencies. Figure 11 shows
a network analyzer plot of an LMH6714/LMH6720/LMH6722
with the following component values:
RG = 309Ω
R1 = 450Ω
C1 = 470pF
R2 = 91Ω
C2 = 68pF
11 www.national.com
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LMH6722Q.PDF ] | |
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