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PDF LMH6703 Data sheet ( Hoja de datos )
| Número de pieza | LMH6703 | |
| Descripción | 1.2Ghz Low Distortion Op Amp | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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May 2005
LMH6703
1.2 GHz, Low Distortion Op Amp with Shutdown
General Description
The LMH™6703 is a very wideband, DC coupled monolithic
operational amplifier designed specifically for ultra high reso-
lution video systems as well as wide dynamic range systems
requiring exceptional signal fidelity. Benefiting from Nation-
al’s current feedback architecture, the LMH6703 offers a
practical gain range of ±1 to ±10 while providing stable
operation without external compensation, even at unity gain.
At a gain of +2 the LMH6703 supports ultra high resolution
video systems with a 750 MHz 2 VPP −3 dB Bandwidth. With
12-bit distortion levels through 10 MHz (RL = 100Ω), and a
2.3nV/
input referred noise, the LMH6703 is the ideal
driver or buffer for high speed flash A/D and D/A converters.
Wide dynamic range systems such as radar and communi-
cation receivers requiring a wideband amplifier offering ex-
ceptional signal purity will find the LMH6703’s low input
referred noise and low harmonic distortion an attractive so-
lution.
Features
n −3 dB bandwidth (VOUT = 0.5 VPP, AV = +2) 1.2 GHz
n 2nd/3rd harmonics (20 MHz, SOT23-6)
−69/−90 dBc
n Low noise
2.3nV/
n Fast slew rate
4500 V/µs
n Supply current
11 mA
n Output current
90 mA
n Low differential gain and phase
0.01%/0.02˚
Applications
n RGB video driver
n High resolution projectors
n Flash A/D driver
n D/A transimpedance buffer
n Wide dynamic range IF amp
n Radar/communication receivers
n DDS post-amps
n Line driver
Connection Diagrams
8-pin SOIC
6-pin SOT23
Top View
Ordering Information
Package
8-Pin SOIC
6-Pin SOT23
Part Number
LMH6703MA
LMH6703MAX
LMH6703MF
LMH6703MFX
20110601
Top View
20110602
Package Marking
LMH6703MA
AR1A
Transport Media
95 Units/Rail
2.5k Units Tape and Reel
1k Units Tape and Reel
3k Units Tape and Reel
NSC Drawing
M08A
MF06A
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LMH™ is a trademark of National Semiconductor Corporation.
© 2005 National Semiconductor Corporation DS201106
www.national.com
1 page  
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Typical Performance Characteristics (AV = +2, RL = 100Ω, VS = ±5V, RF = 560Ω, TA = +25˚C,
SOT23-6; unless otherwise specified). (Continued)
Large Signal Frequency Response
(SOIC)
Small Signal Pulse Response
20110617
Large Signal Pulse Response
20110622
Harmonic Distortion vs. Frequency
20110623
Harmonic Distortion vs. Output Voltage
20110624
Harmonic Distortion vs. Load
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20110627
5
20110625
www.national.com
5 Page 
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Application Section (Continued)
VIDEO PERFORMANCE
20110633
FIGURE 5. Typical Video Application
The LMH6703 has been designed to provide excellent per-
formance with production quality video signals in a wide
variety of formats such as HDTV and High Resolution VGA.
NTSC and PAL performance is nearly flawless with DG of
0.01% and DP of 0.02˚. Best performance will be obtained
with back terminated loads. The back termination reduces
reflections from the transmission line and effectively masks
transmission line and other parasitic capacitance from the
amplifier output stage. Figure 5 shows a typical configuration
for driving 75Ω cable. The amplifier is configured for a gain of
two compensating for the 6 dB loss due to ROUT.
ENABLE/DISABLE
For ±5V supplies only the LMH6703 has a TTL logic com-
patible disable function. Apply a logic low (<.8V) to the SD
pin and the LMH6703 is disabled. Apply a logic high (>2.0V),
or let the pin float and the LMH6703 is enabled. Voltage, not
current, at the Shutdown pin (SD) determines the enable/
disable state. Care must be exercised to prevent the shut-
down pin voltage from going more than 0.8V below the
midpoint of the supply voltages (0V with split supplies, V+/2
with single supply biasing). Doing so could cause transistor
Q1 to Zener resulting in damage to the disable circuit (See
Figure 6). The core amplifier is unaffected by this, but the
shutdown operation could become permanently slower as a
result.
Disabled, the LMH6703 inputs and output become high im-
pedances. While disabled the LMH6703 quiescent current is
approximately 200 µA. Because of the pull up resistor on the
shutdown circuit, the ICC and IEE currents (positive and
negative supply currents respectively) are not balanced in
the disabled state. The positive supply current (ICC) is ap-
proximately 300 µA while the negative supply current (IEE) is
only 200 µA. The remaining IEE current of 100 µA flows
through the shutdown pin.
The disable function can be used to create analog switches
or multiplexers. Implement a single analog switch with one
LMH6703 positioned between an input and output. Create
an analog multiplexer with several LMH6703’s and tie the
outputs together.
20110637
FIGURE 6. SD Pin Simplified Schematic
(SOT23 Pinout Shown)
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11
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| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet LMH6703.PDF ] | |
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