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PDF LMH6715 Data sheet ( Hoja de datos )
| Número de pieza | LMH6715 | |
| Descripción | Dual Wideband Video Op Amp | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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January 2003
LMH6715
Dual Wideband Video Op Amp
General Description
The LMH6715 combines National’s VIP10™ high speed
complementary bipolar process with National’s current feed-
back topology to produce a very high speed dual op amp.
The LMH6715 provides 400MHz small signal bandwidth at a
gain of +2V/V and 1300V/µs slew rate while consuming only
5.8mA per amplifier from ±5V supplies.
The LMH6715 offers exceptional video performance with its
0.02% and 0.02˚ differential gain and phase errors for NTSC
and PAL video signals while driving up to four back termi-
nated 75Ω loads. The LMH6715 also offers a flat gain re-
sponse of 0.1dB to 100MHz and very low channel-to-
channel crosstalk of −70dB at 10MHz. Additionally, each
amplifier can deliver 70mA of output current. This level of
performance makes the LMH6715 an ideal dual op amp for
high density, broadcast quality video systems.
The LMH6715’s two very well matched amplifiers support a
number of applications such as differential line drivers and
receivers. In addition, the LMH6715 is well suited for Sallen
Key active filters in applications such as anti-aliasing filters
for high speed A/D converters. Its small 8-pin SOIC package,
low power requirement, low noise and distortion allow the
LMH6715 to serve portable RF applications such as IQ
channels.
Features
TA = 25˚C, RL = 100Ω, typical values unless specified.
n Very low diff. gain, phase: 0.02%, 0.02˚
n Wide bandwidth: 480MHz (AV = +1V/V); 400MHz (AV =
+2V/V)
n 0.1dB gain flatness to 100MHz
n Low power: 5.8mA/channel
n −70dB channel-to-channel crosstalk (10MHz)
n Fast slew rate: 1300V/µs
n Unity gain stable
n Improved replacement for CLC412
Applications
n HDTV, NTSC & PAL video systems
n Video switching and distribution
n IQ amplifiers
n Wideband active filters
n Cable drivers
n DC coupled single-to-differential conversions
Differential Gain & Phase with
Multiple Video Loads
Frequency Response vs. VOUT
20042908
© 2003 National Semiconductor Corporation DS200429
20042916
www.national.com
1 page  
Typical Performance Characteristics (TA = 25˚C, VCC = ±5V, AV = ±2V/V, RF = 500Ω, RL = 100Ω,
unless otherwise specified). (Continued)
Small Signal Pulse Response
Large Signal Pulse Response
Input-Referred Crosstalk
20042918
20042919
Settling Time vs. Accuracy
−3dB Bandwidth vs. VOUT
20042907
20042924
DC Errors vs. Temperature
20042925
5
20042926
www.national.com
5 Page 
Applications Circuits (Continued)
LOW NOISE WIDE-BANDWIDTH TRANSIMPEDANCE
AMPLIFIER
Figure 7 implements a low noise transimpedance amplifier
using both channels of the LMH6715. This circuit takes
advantage of the lower input bias current noise of the non-
inverting input and achieves negative feedback through the
second LMH6715 channel. The output voltage is set by the
value of RF while frequency compensation is achieved
through the adjustment of RT.
20042947
FIGURE 5. Differential Line Receiver with CMRR
Adjustment
NON-INVERTING CURRENT-FEEDBACK INTEGRATOR
The circuit of Figure 6 achieves its high speed integration by
placing one of the LMH6715’s amplifiers in the feedback
loop of the second amplifier configured as shown.
20042950
FIGURE 7. Low-Noise, Wide Bandwidth,
Transimpedance Amp.
20042949
FIGURE 6. Current Feedback Integrator
11 www.national.com
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LMH6715.PDF ] | |
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