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參數(shù)資料
| 型號： | ICL8013CCTX |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | 運動控制電子 |
| 英文描述： | 1MHz, Four Quadrant Analog Multiplier |
| 中文描述： | ANALOG MULTIPLIER OR DIVIDER, 1 MHz BAND WIDTH, MBCY10 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 132K |
| 代理商： | ICL8013CCTX |
6
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 R
27
and
produces a proportional output voltage.
MULTIPLIER TRIMMING PROCEDURE
1. Set X
IN
= Y
IN
= 0V and adjust Z
OS
for zero Output.
2. Apply a
±
10V low frequency (
≤
100Hz) sweep (sine or trian-
gle) to Y
IN
with X
IN
= 0V, and adjust X
OS
for minimum out-
put.
3. Apply the sweep signal of Step 2 to X
IN
with Y
IN
= 0V and
adjust Y
OS
for minimum Output.
4. Readjust Z
OS
as in Step 1, if necessary.
5. WithX
IN
=10.0V
DC
andthesweepsignalofStep2applied
to Y
IN
, adjust the Gain potentiometer for Output = Y
IN
.
This is easily accomplished with a differential scope plug-
in (A+B) by inverting one signal and adjusting Gain control
for (Output - Y
IN
) = Zero.
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.
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 (X
OS
, Y
OS
, Z
OS
) for 0V.
2. With Z
IN
= 0V, trim Z
OS
to hold the Output constant, as
X
IN
is varied from -10V through -1V.
3. With Z
IN
= 0V and X
IN
= -10.0V adjust Y
OS
for zero Out-
put voltage.
4. With Z
IN
= X
IN
(and/or Z
IN
= -X
IN
) adjust X
OS
for mini-
mum worst case variation of Output, as X
IN
is varied from
-10V to -1V.
5. Repeat Steps 2 and 3 if Step 4 required a large initial ad-
justment.
6. With Z
IN
= X
IN
(and/or Z
IN
= -X
IN
) adjust the gain control
until the output is the closest average around +10.0V
(-10V for Z
IN
= -X
IN
) as X
IN
is varied from -10V to -3V.
V
IN
V+
V
OUT
V-
V-
FIGURE 6B. VOLTAGE GAIN WITH SIGNAL COMPRESSION
OP AMP
MODULATOR
X
IN
Y
IN
Z
IN
I
O
= X
IN
Y
IN
R =
V
OUT
=
1
10
X
IN
Y
IN
10
FIGURE 7A. MULTIPLIER BLOCK DIAGRAM
ICL8013
Z
IN
X
IN
Y
IN
5K
7.5K
7
10
9
X
OS
Y
OS
Z
OS
4
3
6
1
OUTPUT =
X
IN
Y
IN
10
FIGURE 7B. MULTIPLIER CIRCUIT CONNECTION
Therefore IO
XIN
YIN
---------
10ZIN
=
=
=
Since YIN
VOUTVOUT
,
----------------
=
=
ICL8013
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