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PDF LMH6628EP Data sheet ( Hoja de datos )
| Número de pieza | LMH6628EP | |
| Descripción | Voltage Feedback Op Amp | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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LMH6628EP
OBSOLETE
October 15, 2010
Enhanced Plastic Dual Wideband, Low Noise, Voltage
Feedback Op Amp
General Description
The National LMH6628EP is a high speed dual op amp that
offers a traditional voltage feedback topology featuring unity
gain stability and slew enhanced circuitry. The LMH6628EP's
low noise and very low harmonic distortion combine to form
a wide dynamic range op amp that operates from a single (5V
to 12V) or dual (±5V) power supply.
Each of the LMH6628EP's closely matched channels pro-
vides a 300MHz unity gain bandwidth and low input voltage
noise density (2nV/ ). Low 2nd/3rd harmonic distortion
(−65/−74dBc at 10MHz) make the LMH6628EP a perfect
wide dynamic range amplifier for matched I/Q channels.
With its fast and accurate settling (12ns to 0.1%), the
LMH6628EP is also an excellent choice for wide dynamic
range, anti-aliasing filters to buffer the inputs of hi resolution
analog-to-digital converters. Combining the LMH6628EP's
two tightly matched amplifiers in a single 8-pin SOIC package
reduces cost and board space for many composite amplifier
applications such as active filters, differential line drivers/re-
ceivers, fast peak detectors and instrumentation amplifiers.
The LMH6628EP is fabricated using National’s VIP10™ com-
plimentary bipolar process.
To reduce design times and assist in board layout, the
LMH6628EP is supported by an evaluation board
(CLC730036).
ENHANCED PLASTIC
• Extended Temperature Performance of −40°C to +85°C
• Baseline Control - Single Fab & Assembly Site
• Process Change Notification (PCN)
• Qualification & Reliability Data
• Solder (PbSn) Lead Finish is standard
• Enhanced Diminishing Manufacturing Sources (DMS)
Support
Features
■ Wide unity gain bandwidth: 300MHz
■ Low noise: 2nV/
■ Low Distortion: −65/−74dBc (10MHz)
■ Settling time: 12ns to 0.1%
■ Wide supply voltage range: ±2.5V to ±6V
■ High output current: ±85mA
■ Improved replacement for CLC428
Applications
■ High speed dual op amp
■ Low noise integrators
■ Selected Military Applications
■ Selected Avionics Applications
Ordering Information
Part Number
LMH6628MAEP
(Note 1, Note 2)
VID Part Number
V62/04624-01
TBD
NS Package Number (Note 3)
M08A
TBD
Note 1: For the following (Enhanced Plastic) version, check for availability: LMH6628MAXEP. Parts listed with an "X" are provided in Tape & Reel
and parts without an "X" are in Rails.
Note 2: FOR ADDITIONAL ORDERING AND PRODUCT INFORMATION, PLEASE VISIT THE ENHANCED PLASTIC WEB SITE AT: www.national.com/
mil
Note 3: Refer to package details under Physical Dimensions
VIP10™ is a trademark of National Semiconductor Corporation.
© 2010 National Semiconductor Corporation 200886
www.DataSheet.in
200886 Version 4 Revision 2 Print Date/Time: 2010/10/15 15:22:20
www.national.com
1 page  
Frequency Response vs. Load Resistance
Frequency Response vs. Output Amplitude
Frequency Response vs. Capacitive Load
20088625
Gain Flatness & Linear Phase
20088610
20088616
20088624
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200886 Version 4 Revision 2 Print Date/Time: 2010/10/15 15:22:20
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5 Page 
(SOIC) dual op amp evaluation board as a guide for high fre-
quency layout and as an aid in device evaluation.
ANALOG DELAY CIRCUIT (ALL-PASS NETWORK)
The circuit in Figure 1 implements an all-pass network using
the LMH6628EP. A wide bandwidth buffer (LM7121) drives
the circuit and provides a high input impedance for the source.
As shown in Figure 2, the circuit provides a 13.1ns delay (with
R = 40.2Ω, C = 47pF). RF and RG should be of equal and low
value for parasitic insensitive operation.
FIGURE 1.
20088601
In the circuit shown in Figure 3, one of the LMH6628EP's
amps is used as a "driver" and the other as a difference "re-
ceiver" amplifier. The output impedance of the "driver" is
essentially zero. The two R's are chosen to match the char-
acteristic impedance of the transmission line. The "driver" op
amp gain can be selected for unity or greater.
Receiver amplifier A2 (B2) is connected across R and forms
differential amplifier for the signals transmitted by driver A2
(B2). If RF equals RG, receiver A2 (B1) will then reject the sig-
nals from driver A1 (B1) and pass the signals from driver B1
(A1).
20088602
FIGURE 2. Delay Circuit Response to 0.5V Pulse
The circuit gain is +1 and the delay is determined by the fol-
lowing equations.
(1)
(2)
where Td is the delay of the op amp at AV = +1.
The LMH6628EP provides a typical delay of 2.8ns at its −3dB
point.
FULL DUPLEX DIGITAL OR ANALOG TRANSMISSION
Simultaneous transmission and reception of analog or digital
signals over a single coaxial cable or twisted-pair line can re-
duce cabling requirements. The LMH6628EP's wide band-
width and high common-mode rejection in a differential
amplifier configuration allows full duplex transmission of
video, telephone, control and audio signals.
FIGURE 3.
The output of the receiver amplifier will be:
20088603
(3)
Care must be given to layout and component placement to
maintain a high frequency common-mode rejection. The plot
of Figure 4 shows the simultaneous reception of signals trans-
mitted at 1MHz and 10MHz.
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200886 Version 4 Revision 2 Print Date/Time: 2010/10/15 15:22:20
www.national.com
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LMH6628EP.PDF ] | |
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