ICL8013BCTX 데이터 시트보기 (PDF) - Intersil
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ICL8013BCTX Datasheet PDF : 8 Pages
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ICL8013
V+
VOUT
ZIN
IO = XIN • YIN
R= 1
10
XIN
MODULATOR
YIN
OP AMP
VOUT
=
XIN YIN
10
V-
VIN
V-
FIGURE 6B. VOLTAGE GAIN WITH SIGNAL COMPRESSION
Definition of Terms
Multiplication/Division Error: This is the basic accuracy
specification. It includes terms due to linearity, gain, and
offset errors, and is expressed as a percentage of the full
scale output.
Feedthrough: With either input at zero, the output of an
ideal multiplier should be zero regardless of the signal
applied to the other input. The output seen in a non-ideal
multiplier is known as the feedthrough.
Nonlinearity: The maximum deviation from the best
straight line constructed through the output data, expressed
as a percentage of full scale. One input is held constant and
the other swept through it nominal range. The nonlinearity is
the component of the total multiplication/division error which
cannot be trimmed out.
Typical Applications
Multiplication
In the standard multiplier connection, the Z terminal is
connected to the op amp output. All of the modulator output
current thus flows through the feedback resistor R27 and
produces a proportional output voltage.
MULTIPLIER TRIMMING PROCEDURE
1. Set XIN = YIN = 0V and adjust ZOS for zero Output.
2. Apply a ±10V low frequency (≤100Hz) sweep (sine or trian-
gle) to YIN with XIN = 0V, and adjust XOS for minimum out-
put.
3. Apply the sweep signal of Step 2 to XIN with YIN = 0V and
adjust YOS for minimum Output.
4. Readjust ZOS as in Step 1, if necessary.
5. With XIN = 10.0VDC and the sweep signal of Step 2 applied
to YIN, adjust the Gain potentiometer for Output = YIN.
This is easily accomplished with a differential scope plug-
in (A+B) by inverting one signal and adjusting Gain control
for (Output - YIN) = Zero.
FIGURE 7A. MULTIPLIER BLOCK DIAGRAM
XIN
YIN
5K
ZIN 3
6
1
ICL8013
7 10 9
7.5K
XOS YOS ZOS
OUTPUT = XIN YIN
10
4
FIGURE 7B. MULTIPLIER CIRCUIT CONNECTION
Division
If the Z terminal is used as an input, and the output of the op
amp connected to the Y input, the device functions as a
divider. Since the input to the op amp is at virtual ground,
and requires negligible bias current, the overall feedback
forces the modulator output current to equal the current
produced by Z.
Therefore IO = XIN • YIN = Z---R-I--N--- = 10ZIN
Since YIN = VOUT, VOUT = 1----0X----ZI--N--I--N--
Note that when connected as a divider, the X input must be a
negative voltage to maintain overall negative feedback.
DIVIDER TRIMMING PROCEDURE
1. Set trimming potentiometers at mid-scale by adjusting
voltage on pins 7, 9 and 10 (XOS, YOS, ZOS) for 0V.
2. With ZIN = 0V, trim ZOS to hold the Output constant, as
XIN is varied from -10V through -1V.
3. With ZIN = 0V and XIN = -10.0V adjust YOS for zero Out-
put voltage.
4. With ZIN = XIN (and/or ZIN = -XIN) adjust XOS for mini-
mum worst case variation of Output, as XIN is varied from
-10V to -1V.
5. Repeat Steps 2 and 3 if Step 4 required a large initial ad-
justment.
6. With ZIN = XIN (and/or ZIN = -XIN) adjust the gain control
until the output is the closest average around +10.0V
(-10V for ZIN = -XIN) as XIN is varied from -10V to -3V.
6
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