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PDF LMH6718 Data sheet ( Hoja de datos )
| Número de pieza | LMH6718 | |
| Descripción | Dual / High Output / Programmable Gain Buffer | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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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 ±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˚. These
features are ideal for professional and consumer video ap-
plications.
The LMH6718 offers superior dynamic performance with a
130MHz small-signal bandwidth, 600V/µs slew rate and
4.2ns rise/fall times (2VSTEP). 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 100Ω load with only −84/−84dBc
second/third harmonic distortion (AV = +2, VOUT = 2VPP, 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 (AV =
+2, VOUT = 2VPP, f = 1MHz, RL = 1kΩ) and fast settling time.
The LMH6718 is fabricated using National’s VIP10™ com-
plimentary bipolar process.
Features
n 200mA output current
n .04%, .03˚ differential gain, phase
n 5.2mA supply current for 2 amplifiers
n 130MHz bandwidth (AV = +2)
n −88/−98dBc HD2/HD3 (1MHz)
n 16ns settling to 0.05%
n 600V/µs slew rate
n Nominal supply range ±2.5V to ±6V
n Improved replacement for CLC5632
Applications
n Video line driver
n Coaxial cable driver
n Twisted pair driver
n Transformer/coil driver
n High capacitive load driver
n Portable/battery powered applications
n A/D driver
n I/Q Channel Amplifier
Connection Diagram
8-Pin SOIC
Maximum Output Voltage vs. Load
Resistance
Top View
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© 2003 National Semiconductor Corporation DS200401
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www.national.com
1 page  
Typical Performance Characteristics (AV = +2, RL = 100Ω, Unless Specified).
Frequency Response vs. Gain
Frequency Response
Frequency Response RL
20040106
Frequency Response vs. RL
20040123
Gain Flatness & Linear Phase
20040125
Gain Flatness & Linear Phase
20040124
20040107
5
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www.national.com
5 Page 
Application Section (Continued)
The input is AC coupled to prevent the need for level shifting
the input signal at the source. The resistive voltage divider
biases the non-inverting input to VCC ÷ 2 = 2.5V (For VCC =
+5V)
20040140
FIGURE 2. DC Coupled, AV = +1V/V Configuration
20040143
FIGURE 5. AC Coupled, AV = +1V/V Configuration
20040141
FIGURE 3. DC Coupled, AV = +2V/V Configuration
AC COUPLED SINGLE SUPPLY OPERATION
Figure 4, Figure 5, and Figure 6 show possible non-inverting
and inverting configurations for input signals that go below
0.8V DC.
20040144
FIGURE 6. AC Coupled, AV = +2V/V Configuration
DUAL SUPPLY OPERATION
The LMH6718 operates on dual supplies as well as single
supplies. The non-inverting and inverting configurations are
shown in Figure 7, Figure 8, and Figure 9.
20040142
FIGURE 4. AC Coupled, AV = −1V/V Configuration
11 www.national.com
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LMH6718.PDF ] | |
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