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THS4521 датащи(PDF) 28 Page - Texas Instruments

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номер детали THS4521
подробное описание детали  VERY LOW POWER, NEGATIVE RAIL INPUT, RAIL-TO-RAIL OUTPUT, FULLY DIFFERENTIAL AMPLIFIER
PDF  43 Pages
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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THS4521 датащи(HTML) 28 Page - Texas Instruments

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Driving Capacitive Loads
1k
100
10
1
10
100
1000
C
(pF)
LOAD
RECOMMENDEDR vsC
ForFlatFrequencyResponse
O
LOAD
V
=5.0V
Gain=1V/V
S+
PP
R =1k
R =1k
Differential
V
=100mV
F
L
OUT
W
W
0.1
1
10
100
1000
Frequency(MHz)
5
0
5
10
15
20
25
-
-
-
-
-
FREQUENCYRESPONSEvsC
LOAD
R =124
C =10pF
eachoutput
W
O
L
R =37.5
C =100pFeachoutput
W
O
L
R =7.15
C =1000pFeachoutput
W
O
L
R =150
C =4.7pF
eachoutput
W
O
L
V
=5.0V,Gain=1V/V
S+
PP
R =1k
differential
R =1k
V
=100mV
F
L
OUT
W
W
THS4521
THS4522
THS4524
SBOS458B – DECEMBER 2008 – REVISED MAY 2009.................................................................................................................................................... www.ti.com
The THS4521, THS4522, and THS4524 family is
designed for a nominal capacitive load of 1 pF on
each output to ground. When driving capacitive loads
greater than 1 pF, it is recommended to use small
resistors (RO) in series with the output, placed as
close
to
the
device
as
possible.
Without
RO,
capacitance on the output interacts with the output
impedance of the amplifier and causes phase shift in
the loop gain of the amplifier that reduces the phase
margin.
This reduction in phase margin results in frequency
response peaking; overshoot, undershoot, and/or
ringing when a step or square-wave signal is applied;
and may lead to instability or oscillation. Inserting RO
isolates the phase shift from the loop gain path and
restores
the
phase
margin,
but
it
also
limits
bandwidth. Figure 66 shows the recommended
Figure 66. Recommended Series Output Resistor
values of RO versus capacitive loads (CL). Figure 67
versus Capacitive Load for Flat Frequency
shows the frequency response with various values.
Response, with RLOAD = 1 kΩ
Figure 67. Frequency Response for Various RO
and CL Values, with RLOAD = 1 kΩ
28
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Copyright © 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): THS4521 THS4522 THS4524



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