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LMH6628MAEP Datasheet(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LMH6628MAEP
Description  Enhanced Plastic Dual Wideband, Low Noise, Voltage Feedback Op Amp
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMH6628MAEP Datasheet(HTML) 11 Page - National Semiconductor (TI)

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(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 = 40.2
Ω, C = 47pF). R
F and RG should be of equal and low
value for parasitic insensitive operation.
20088601
FIGURE 1.
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 T
d 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.
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 A
2 (B2) is connected across R and forms
differential amplifier for the signals transmitted by driver A
2
(B
2). If RF equals RG, receiver A2 (B1) will then reject the sig-
nals from driver A
1 (B1) and pass the signals from driver B1
(A
1).
20088603
FIGURE 3.
The output of the receiver amplifier will be:
(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.
11
www.national.com
200886 Version 4 Revision 2
Print Date/Time: 2010/10/15 15:22:20


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