icl8013 Intersil Corporation, icl8013 Datasheet - Page 6

• Manufacturer Part Number: icl8013
• Description: 1mhz, Four Quadrant Analog Multiplier
• Manufacturer: Intersil Corporation

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
produces a proportional output voltage.
MULTIPLIER TRIMMING PROCEDURE
1. Set X
2. Apply a ±10V low frequency (≤100Hz) sweep (sine or trian-
3. Apply the sweep signal of Step 2 to X
4. Readjust Z
5. With X
FIGURE 6B. VOLTAGE GAIN WITH SIGNAL COMPRESSION
gle) to Y
put.
adjust Y
to Y
is easily accomplished with a differential scope plug-in
(A+B) by inverting one signal and adjusting Gain control for
(Output - Y
IN
IN
, adjust the Gain potentiometer for Output = Y
IN
V
IN
OS
= Y
= 10.0V
IN
with X
IN
OS
IN
for minimum Output.
) = Zero.
= 0V and adjust Z
as in Step 1, if necessary.
DC
IN
= 0V, and adjust X
and the sweep signal of Step 2 applied
V
OUT
6
V+
V-
V-
OS
for zero Output.
IN
OS
with Y
for minimum out-
IN
27
= 0V and
and
IN
. This
ICL8013
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
Therefore I O
Since Y
X
Y
1. Set trimming potentiometers at mid-scale by adjusting
2. With Z
3. With Z
4. With Z
5. Repeat Steps 2 and 3 if Step 4 required a large initial ad-
6. With Z
IN
IN
X
Y
IN
IN
voltage on pins 7, 9 and 10 (X
X
put voltage.
mum worst case variation of Output, as X
-10V to -1V.
justment.
until the output is the closest average around +10.0V
(-10V for Z
7.5K
IN
FIGURE 7B. MULTIPLIER CIRCUIT CONNECTION
5K
IN
MODULATOR
is varied from -10V through -1V.
FIGURE 7A. MULTIPLIER BLOCK DIAGRAM
IN
=
IN
IN
IN
Z
V
=
= 0V, trim Z
= 0V and X
= X
= X
IN
OUT
IN
X IN Y IN
IN
IN
= -X
3
6
1
,
(and/or Z
•
(and/or Z
V
I
X
7
O
OUT
IN
OS
= X
) as X
IN
10
ICL8013
OS
IN
Y
=
OS
=
= -10.0V adjust Y
• Y
Z IN
--------- -
IN
to hold the Output constant, as
R
IN
Z
10Z IN
---------------- -
IN
IN
Z
IN
9
X IN
= -X
OS
= -X
=
is varied from -10V to -3V.
R =
10Z IN
OS
IN
IN
OP AMP
) adjust the gain control
, Y
10
1
) adjust X
OS
4
, Z
OUTPUT =
OS
IN
OS
is varied from
OS
for zero Out-
V
) for 0V.
OUT
for mini-
=
X
X
IN
10
IN
10
Y
IN
Y
IN