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PDF LMH6702 Data sheet ( Hoja de datos )
| Número de pieza | LMH6702 | |
| Descripción | Ultra Low Distortion / Wideband Op Amp | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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June 2003
LMH6702
Ultra Low Distortion, Wideband Op Amp
General Description
The LMH6702 is a very wideband, DC coupled monolithic
operational amplifier designed specifically for wide dynamic
range systems requiring exceptional signal fidelity. Benefit-
ing from National’s current feedback architecture, the
LMH6702 offers unity gain stability at exceptional speed
without need for external compensation.
With its 720MHz bandwidth (AV = 2V/V, VO = 2VPP), 10-bit
distortion levels through 60MHz (RL = 100Ω), 1.83nV/
input referred noise and 12.5mA supply current, the
LMH6702 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 LMH6702’s low input
referred noise and low harmonic and intermodulation distor-
tion make it an attractive high speed solution.
The LMH6702 is constructed using National’s VIP10™ com-
plimentary bipolar process and National’s proven current
feedback architecture. The LMH6702 is available in SOIC
and SOT23-5 packages.
Features
VS = ±5V, TA = 25˚C, AV = +2V/V, RL = 100Ω, VOUT = 2VPP,
Typical unless Noted:
n 2nd/3rd Harmonics (5MHz, SOT23-5)
−100/−96dBc
n −3dB Bandwidth (VOUT = 2VPP)
n Low noise
720MHz
1.83nV/
n Fast settling to 0.1%
13.4ns
n Fast slew rate
3100V/µs
n Supply current
12.5mA
n Output current
80mA
n Low Intermodulation Distortion (75MHz)
−67dBc
n Improved Replacement for CLC409 and CLC449
Applications
n Flash A/D driver
n D/A transimpedance buffer
n Wide dynamic range IF amp
n Radar/communication receivers
n Line driver
n High resolution video
Inverting Frequency Response
Harmonic Distortion vs. Load and Frequency
20039002
© 2003 National Semiconductor Corporation DS200390
20039007
www.national.com
1 page  
Typical Performance Characteristics (TA = 25˚C, VS = ±5V, RL = 100Ω, Rf = 237Ω; Unless Speci-
fied).
Non-Inverting Frequency Response
Inverting Frequency Response
20039001
Frequency Response for Various RL’s, AV = +2
20039002
Frequency Response for Various RL’s, AV = +4
Step Response, 2VPP
20039018
Step Response, 6VPP
20039017
20039005
5
20039006
www.national.com
5 Page 
Application Section (Continued)
DC ACCURACY AND NOISE
Example below shows the output offset computation equa-
tion for the non-inverting configuration using the typical bias
current and offset specifications for AV = + 2:
Output Offset : VO = (±IBN · RIN ± VIO) (1 + RF/RG) ± IBI · RF
Where RIN is the equivalent input impedance on the non-
inverting input.
Example computation for AV = +2, RF = 237Ω, RIN = 25Ω:
VO = (±6µA · 25Ω ± 1mV) (1 + 237/237) ± 8µA · 237 =
±4.20mV
A good design, however, should include a worst case calcu-
lation using Min/Max numbers in the data sheet tables, in
order to ensure "worst case" operation.
Further improvement in the output offset voltage and drift is
possible using the composite amplifiers described in Appli-
cation Note OA-7. The two input bias currents are physically
unrelated in both magnitude and polarity for the current
feedback topology. It is not possible, therefore, to cancel
their effects by matching the source impedance for the two
inputs (as is commonly done for matched input bias current
devices).
The total output noise is computed in a similar fashion to the
output offset voltage. Using the input noise voltage and the
two input noise currents, the output noise is developed
through the same gain equations for each term but com-
bined as the square root of the sum of squared contributing
elements. See Application Note OA-12 for a full discussion of
noise calculations for current feedback amplifiers.
PRINTED CIRCUIT LAYOUT
Generally, a good high frequency layout will keep power
supply and ground traces away from the inverting input and
output pins. Parasitic capacitances on these nodes to
ground will cause frequency response peaking and possible
circuit oscillations (see Application Note OA-15 for more
information). National Semiconductor suggests the following
evaluation boards as a guide for high frequency layout and
as an aid in device testing and characterization:
Device
LMH6702MF
LMH6702MA
Package
SOT23-5
SOIC
Evaluation Board
Part Number
CLC730216
CLC730227
These free evaluation boards are shipped when a device
sample request is placed with National Semiconductor.
11 www.national.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet LMH6702.PDF ] | |
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