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
scaled with the value of RCONVERT and provides an output
impedance of typically 1MΩ. The equation for IOUT becomes:
IOUT = A------5×-----B-- × -R----C----O-----N-1---V----E----R----T--
Video Fader
The Video Fader circuit provides a unique function. Here Ch B
is applied to the minus Z input in addition to the minus Y input.
In this way, the function in Figure 11 is generated. VMIX will
control the percentage of Ch A and Ch B that are mixed
together to produce a resulting video image or other signal.
A
VX+
+
-
VX-
1/5V
B
VY+
+
-
VY-
HA-2556
X
+
∑
-
Y
Z
VOUT RCONVERT
A
VZ +
+
-
VZ -
IOUT
FIGURE 10. CURRENT OUTPUT
The Balance equation looks like:
(VMIX) × (ChA – ChB) = 5(VOUT – ChB)
Which simplifies to:
VOUT
=
Ch
B
+
V-----M-----I-X--
5
( Ch
A
–
Ch
B
)
When VMIX is 0V the equation becomes VOUT = Ch B and
Ch A is removed, conversely when VMIX is 5V the equation
becomes VOUT = Ch A eliminating Ch B. For VMIX values
0V ≤ VMIX ≤ 5V the output is a blend of Ch A and Ch B.
Ch A
Ch B
NC
NC
NC
VY+
VY-
-15V
1
REF
2
16
NC
15
NC
3
4
5 +-
6
7
8
14
NC
+-
13
VX + VMIX
(0V to 5V)
12
11
+
Σ
-
+-
10
9
+15 V
VZ -
VZ +
VOUT
50Ω
FIGURE 11. VIDEO FADER
Other Applications
As shown above, a function may contain several different
operators at the same time and use only one 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.
A
5K
B
5K
VX+
+
-
VX-
1/5V
VY+
+
-
VY-
HA-2556
X
+
∑
-
Y
Z
W = 5(A2-B2)
A
5K
VZ +
+
-
VZ -
5K
FIGURE 12. DIFFERENCE OF SQUARES
R1
5K
A
95K
VX-
R2
+
-
VX+
1/5V
VY+
+
-
VY-
HA-2556
X
+
∑
-
Y
Z
A-B
VOUT W = 100 A
A
VZ +
+
B
-
VZ -
R1 and R2 set scale to 1V/%, other scale factors possible.
For A 0V.
FIGURE 13. PERCENTAGE DEVIATION
VX-
+
-
VX+
HA-2556
X
VOUT
A
A-B
W = 10 B + A
1/5V
+
∑
VY+
+
Y
-
Z
VZ +
+
B
-
-
A
5K
VY-
VZ -
5K
FIGURE 14. DIFFERENCE DIVIDED BY SUM S (For A + B ≥ 0V)
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
control input. At DC the circuit is an integrator automatically
compensating for Offset and other constant error terms.
7
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