ha1-2546/883 Intersil Corporation, ha1-2546/883 Datasheet - Page 17

• Manufacturer Part Number: ha1-2546/883
• Description: Wideband Two Quadrant Analog Multiplier Voltage Output
• Manufacturer: Intersil Corporation

DESIGN INFORMATION
The information contained in this section has been developed through characterization by Intersil Semiconductor and is for use as
application and design information only. No guarantee is implied.
Adjusting the scale factor will tailor the control signal, V
input voltage range to match your needs. Referring to the
simplified schematic and looking for the V
will notice the unusual design. The internal reference sets up
a 1.2mA current sink for the V
signal applied to this input will be forced across the scale
factor setting resistor and set the current flowing in the V
side of the differential pair. When the current through this
resistor reaches 1.2mA, all the current available is flowing in
the one side and full scale has been reached. Normally the
1.67k
Gain Adjust pins B and C are connected together, but you
may set this resistor to any convenient value using pins 16
(GA A) and 15 (GA C).
FIGURE 2A. MULTIPLIER, V
FIGURE 2B. MULTIPLIER, V
internal resistor sets the scale factor to 2V when the
V
V
NC
NC
NC
Y
NC
NC
NC
Y
V-
V-
+
+
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
+
+
-
-
REF
REF
Y
Y
50
50
+
+
-
-
OUT
OUT
X
X
Z
Z
+
+
+
+
-
-
-
-
= V
= V
X
16
15
14
13
12
11
10
16
15
14
13
12
11
10
9
9
differential pair. The control
X
X
V
V
NC
V
V+
NC
V
V+
Y
Y
1K
1K
X
X
/ 2, SCALE FACTOR = 2V
/ 5, SCALE FACTOR = 5V
+
+
4.167K
X
input stage, you
(Continued)
V
V
OUT
OUT
HA2546
X+
X
8-19
,
In Figure 3, the HA-2546 is configured in a true Automatic
Gain Control or AGC application. The HA-5127, low noise op
amp, provides the gain control level to the X input. This level
will set the peak output voltage of the multiplier to match the
reference level. The feedback network around the HA-5127
provides stability and a response time adjustment for the
gain control circuit.
1N914
5k
FIGURE 3. AUTOMATIC GAIN CONTROL
V
20k
NC
NC
NC
Y
V-
+
+15V
10k
1
2
3
4
5
6
7
8
+
-
REF
Y
50
+
0.1 F
-
10k
X
Z
0.01 F
Spec Number
+
+
-
-
+
-
16
15
14
13
12
11
10
9
HA-5127
NC
V+
0.1 F
511050-883
3.3V
V
OUT