HA1-2556-9 Intersil, HA1-2556-9 Datasheet - Page 9

• Manufacturer Part Number: HA1-2556-9
• Description: IC MULTIPLIER 4QUAD VOUT 16-DIP
• Manufacturer: Intersil
• Series: HAr

Specifications of HA1-2556-9

• Function: Analog Multiplier
• Number Of Bits/stages: 4-Quadrant
• Package / Case: 16-CDIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

HA-2556. Some other possible multi-operator functions are
shown in Figures 12, 13 and 14.
Of course the HA-2556 is also well suited to standard
multiplier applications such as Automatic Gain Control and
Voltage Controlled Amplifier.
Automatic Gain Control
Figure 15 shows the HA-2556 configured in an Automatic
Gain Control or AGC application. The HA-5127 low noise
amplifier provides the gain control signal to the X input. This
control signal sets the peak output voltage of the multiplier to
match the preset reference level. The feedback network
around the HA-5127 provides a response time adjustment.
High frequency changes in the peak are rejected as noise or
the desired signal to be transmitted. These signals do not
indicate a change in the average peak value and therefore
no gain adjustment is needed. Lower frequency changes in
the peak value are given a gain of -1 for feedback to the
FIGURE 14. DIFFERENCE DIVIDED BY SUM S (For A + B ≥ 0V)
B
R
For A ≥ 0V.
A
1
5k
5k
A
and R
R
5k
1
5k
5k
2
V
V
V
V
V
V
V
V
Y
Y
FIGURE 12. DIFFERENCE OF SQUARES
set scale to 1V/%, other scale factors possible.
X
X
X
Y
Y
V
V
X
V
V
FIGURE 13. PERCENTAGE DEVIATION
+
-
+
-
-
+
+
-
Y
Y
X
X
1/5V
+
-
1/5V
+
-
1/5V
+
+
-
-
+
-
+
-
+
+
95k
-
-
R
2
X
Y
Y
X
X
Y
HA-2556
HA-2556
HA-2556
+
+
9
-
+
-
∑
-
∑
∑
Z
Z
Z
A
+
A
-
A
+
-
+
-
V
V
V
V
OUT
V
V
OUT
Z
Z
Z
Z
V
V
+
-
+
-
Z
Z
+
-
W = 100
W = 5(A
W = 10
5k
5k
B
A
B
2
A - B
B + A
A - B
-B
A
2
HA-2556
)
control input. At DC the circuit is an integrator automatically
compensating for Offset and other constant error terms.
This multiplier has the advantage over other AGC circuits, in
that the signal bandwidth is not affected by the control signal
gain adjustment.
Voltage Controlled Amplifier
A wide range of gain adjustment is available with the Voltage
Controlled Amplifier configuration shown in Figure 16. Here
the gain of the HFA0002 can be swept from 20V/V to a gain
of almost 1000V/V with a DC voltage from 0V to 5V.
Wave Shaping Circuits
for the analog multiplier. For example, where a nonlinear
sensor requires corrective curve fitting to improve linearity
the HA-2556 can provide nonintegral powers in the range of
1 to 2 or nonintegral roots in the range of 0.5 to 1.0 (refer to
“References” on page 11). This effect is displayed in
Figure 17.
Wave shaping or curve fitting is another class of application
1N914
5kΩ
FIGURE 15. AUTOMATIC GAIN CONTROL
20kΩ
V
+15V
NC
NC
NC
V-
10kΩ
Y
+
1
2
3
4
5
6
7
8
REF
Y
50Ω
HA-2556
0.1μF
Σ
10kΩ
+
-
0.01μF
X
+
Z
-
HA-5127
16
15
14
13
12
11
10
9
0.1μF
NC
NC
NC
V+
5.6V
April 29, 2008
FN2477.6
V
OUT