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LF13007 датащи(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали LF13007
подробное описание детали  Digital Gain Set
Download  8 Pages
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LF13007 датащи(HTML) 5 Page - National Semiconductor (TI)

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Application Information
FLOW-THROUGH OPERATION
THE LF13006 LF13007 can be operated with control lines
CS and WR grounded In this mode new data on the digital
inputs will immediately set the new gain value Input data
cannot be latched in this mode
INPUT CURRENT
Current flowing through the input (pin 2) due to bias current
of the op amp will result in a gain error due to switch imped-
ance Normally this error is very small For example 10 nA
of bias current flowing through 3 kX of switch resistance will
result in an error of 30 mV at the summing node However
applications that have significant current flowing through the
input must take this effect into account
SETTLING TIME
Settling time is a function of the particular op amp used with
the LF130067 and the gain that is selected It can be opti-
mized and stability problems can be prevented through the
use of a lead capacitor from the inverting input to the output
of the amplifier A lead capacitor is effective whenever the
feedback around an amplifier is resistive whether with dis-
crete resistors or with the LF130067 It compensates for
the feedback pole created by the parallel resistance and
capacitance from the inverting input of the op amp to AC
ground
Settling Time Test Circuit
TLH5114 – 6
Typical Settling Time Curves
TLH5114 – 7
Unstable at CL less than 2 pF
Typical Applications
Variable Capacitance Multiplier
Ceffective e C1(gain set
)
Note Output swing at input op amp
is multiplied by set gain Signal
range may be limited
TLH5114 – 8
Variable Time Constant Filter
Time constant e
R
N
C1
N e setting of LF13006
(range e
1
128
to 1)
TLH5114 – 9
5


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