LMH6718 Dual, High Output, Programmable Gain Buffer
January 2003
LMH6718
Dual, High Output, Programmable Gain Buffer
General Description
The LMH6718 is a dual, low cost high speed (130MHz)
buffer which features user programmable gains of +2, +1,
and -1V/V. The LMH6718 also has a new output stage that
delivers high output drive current (200mA), but consumes
minimal quiescent supply current (2.6mA/Amp) from a
鹵
5V
supply. Its current feedback architecture, fabricated in an
advanced complementary bipolar process, maintains consis-
tent performance over a wide range of signal levels, and has
a linear phase response up to one half of the -3dB frequency.
The LMH6718 offers 0.1dB gain flatness to 30MHz and
differential gain and phase errors of .04% and .03藲. These
features are ideal for professional and consumer video ap-
plications.
The LMH6718 offers superior dynamic performance with a
130MHz small-signal bandwidth, 600V/碌s slew rate and
4.2ns rise/fall times (2V
STEP
). The combination of low quies-
cent current, high output current drive, and high speed per-
formance makes the LMH6718 well suited for many battery
powered personal communication/computing systems. The
ability to drive low impedance, high capacitive loads, makes
the LMH6718 ideal for single ended cable applications. It
also drives low impedance loads with minimum distortion.
The LMH6718 will drive a 100鈩?load with only 鈭?4/鈭?4dBc
second/third harmonic distortion (A
V
= +2, V
OUT
= 2V
PP
, f =
1MHz). It is also optimized for driving high currents into
single-ended transformers and coils. When driving the input
of high resolution A/D converters, the LMH6718 provides
excellent -88/-98dBc second/third harmonic distortion (A
V
=
+2, V
OUT
= 2V
PP
, f = 1MHz, R
L
= 1k鈩? and fast settling time.
The LMH6718 is fabricated using National鈥檚 VIP10
鈩?/div>
com-
plimentary bipolar process.
Features
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200mA output current
.04%, .03藲 differential gain, phase
5.2mA supply current for 2 amplifiers
130MHz bandwidth (A
V
= +2)
鈭?8/鈭?8dBc HD2/HD3 (1MHz)
16ns settling to 0.05%
600V/碌s slew rate
Nominal supply range
鹵
2.5V to
鹵
6V
Improved replacement for CLC5632
Applications
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Video line driver
Coaxial cable driver
Twisted pair driver
Transformer/coil driver
High capacitive load driver
Portable/battery powered applications
A/D driver
I/Q Channel Amplifier
Connection Diagram
8-Pin SOIC
Maximum Output Voltage vs. Load
Resistance
20040116
Top View
20040164
漏 2003 National Semiconductor Corporation
DS200401
www.national.com
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