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參數(shù)資料
| 型號(hào)： | HA-2547 |
| 廠商： | Intersil Corporation |
| 英文描述： | 100MHz, Two Quadrant, Current Output, Analog Multiplier |
| 中文描述： | 100MHz時(shí)，兩個(gè)象限，電流輸出，模擬乘法器 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 836K |
| 代理商： | HA-2547 |
5
The transfer equation for the HA-2547 is:
SF = Scale Factor
R
Z
= 2.5kV (Internal)
V
X
, V
Y
= Differential Inputs
The scale factor is used to maintain the output of the
multiplier within the normal operating range of
±
5V. The
scale factor can be defined by the user by way of an optional
external resistor, R
EXT
, and the Gain Adjust pins: Gain
Adjust A (GA A), Gain Adjust B (GA B), and Gain Adjust C
(GA C). The scale factor is determined as follows:
SF = 2, when GA B is shorted to GA C
SF
≈
(1.2)(R
EXT
), when R
EXT
is connected between GA A
and GA C (R
EXT
is in k
)
SF
≈
(1.2)(R
EXT
+ 1.667k
), when R
EXT
is connected to
GA B and GA C (R
EXT
is in k
).
The scale factor can be adjusted from 2 to 5. It should be
noted that any adjustments to the scale factor will affect the
AC performance of the control channel, V
X
. The normal
input operating range of V
X
is equal to the scale factor value.
A typical multiplier configuration is shown in Figure 3. The
ideal transfer function for this configuration is shown below,
illustrating two quadrant operation:
The V
X
- pin is usually connected to ground so that when
V
X
+ is negative there is no signal at the output, i.e. two
quadrant operation. If the V
X
input is a negative going signal
the V
X
+ pin maybe grounded and the V
X
- pin used as the
input. The V
Y
- terminal is usually grounded allowing V
Y
+ to
swing
±
5V. R
Z
is normally used as a feedback resistor for an
external op amp to provide an accurate current-to-voltage
conversion. The scale factor is normally set to 2 by
connecting GA B to GA C. Therefore, the transfer function
becomes:
The multiplication error is trimmed to be minimum at full
scale, V
X
= 2V and V
Y
=
±
5V. When V
Y
=
±
5V, the worst
case multiplication error occurs when V
X
≈
0.8V (Refer to
typical performance curves).
Operation At Various Supply Voltages
The HA-2547 will operate over a range of supply voltages,
±
8V to
±
15V. Use of supply voltages below
±
12V will cause
degradation of electrical parameters.
Offset Adjustment
The signal channel offset voltage may be nulled by using a
20K potentiometer between V
YIO
Adjust pins A and B and
connecting the wiper to V-. Reducing the signal channel
offset voltage will reduce V
X
AC feedthrough and improve
the multiplication error.
I
OUT
V
Z
---------------
V
---------------------------------------------------------------
, where
V
–
(
)
V
Z
V
–
(
)
=
=
when V
X+
V
X-
–
)
0
≥
V
OUT
0,
=
when V
X+
V
X-
–
)
0
<
V
OUT
V
---------------------------------------------------------------
,
V
–
(
)
V
V
–
(
)
=
VOUT
---------------------------------
(
)
(
)
=
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
+15V
V
X
REF
-
+
-15V
+15V
-15V
V
Y
V
OUT
R
L
-
+
-
+
X
FIGURE 3.
HA-2547
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