HA-2556 查看數據表（PDF） - Intersil
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HA-2556 Datasheet PDF : 15 Pages
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HA-2556
This multiplier has the advantage over other AGC circuits, in
that the signal bandwidth is not affected by the control signal
gain adjustment.
HA-2556
1
NC 2
NC 3
NC 4
VY+ 5
6
V- 7
8
REF
X
Y
+
Σ
-
Z
16 NC
15 NC
14 NC
13
12
11 V+
10
9
1N914
5kΩ
10kΩ
+15V
20kΩ
50Ω
10kΩ
0.1µF
0.01µF
-
+
HA-5127
0.1µF
VOUT
5.6V
FIGURE 15. AUTOMATIC GAIN CONTROL
HA-2556
1
REF
NC 2
16 NC
15 NC
NC 3
14 NC
NC 4
5
Y
6
13 VX + (VGAIN)
X
12
11 V+
V- 7
8
+
Σ
-
Z
10
9
Wave Shaping Circuits
Wave shaping or curve fitting is another class of application
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 1
to 2 or nonintegral roots in the range 0.5 to 1.0 (refer to
References). This effect is displayed in Figure 17.
1
0.8
0.6
X0.7
X0.5
0.4
X1.5
0.2
X2
0
0
0.2
0.4
0.6
0.8
1
INPUT (V)
FIGURE 17. EFFECT OF NONINTEGRAL POWERS / ROOTS
A multiplier can’t do nonintegral roots “exactly”, but it can
yield a close approximation. We can approximate
nonintegral roots with equations of the form:
Vo = (1 – α)VI2N + αVIN
Vo = (1 – α)VI1N⁄ 2 + αVIN
Figure 18 compares the function VOUT = VIN0.7 to the
approximation VOUT = 0.5VIN0.5 + 0.5VIN.
1
0.8
X0.7
0.6
0.5X0.5+ 0.5X
0.4
VOUT
5kΩ
500Ω
-
VIN
+
HFA0002
FIGURE 16. VOLTAGE CONTROLLED AMPLIFIER
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.
0.2
X
0
0
0.2
0.4
0.6
0.8
1
INPUT (V)
FIGURE 18. COMPARE APPROXIMATION TO NONINTEGRAL
ROOT
This function can be easily built using an HA-2556 and a
potentiometer for easy adjustment as shown in Figures 19 and
20. If a fixed nonintegral power is desired, the circuit shown in
Figure 21 eliminates the need for the output buffer amp. These
circuits approximate the function VIMN where M is the desired
nonintegral power or root.
8
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