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參數(shù)資料
| 型號(hào)： | HA-2557 |
| 廠商： | Intersil Corporation |
| 英文描述： | 130MHz, Four Quadrant, Current Output Analog Multiplier |
| 中文描述： | 130MHz的，四象限，電流輸出模擬乘法器 |
| 文件頁數(shù)： | 3/10頁 |
| 文件大?。?/td> | 576K |
| 代理商： | HA-2557 |
8-3
Test Circuit and Waveform
Application Information
Operation at Reduced Supply Voltages
The HA-2557 will operate over a range of supply voltages,
±
5V to
±
15V. Use of supply voltages below
±
12V will reduce
input and output voltage ranges. See “Typical Performance
Curves” for more information. The
±
5V range is particularly
useful in video applications. At
±
5V the input voltage range is
reduced to
±
1.4V limiting the fullscale output current.
Another current output option is the HA-2556 voltage output
multiplier configured for current output with an output sens-
ing resistor (Refer to the HA-2556 data sheet).
Offset Adjustment
The channel offset voltage may be nulled by using a 20K poten-
tiometer between the V
YIO
or V
XIO
adjust pin A and B and con-
necting the wiper to V-. Reducing the channel offset voltage will
reduce AC feedthrough and improve the multiplication error.
Theory of Operation
The HA-2557 creates an output current that is the product of
the X and Y input voltages divided by a constant scale factor of
10kV
. The resulting output has the correct polarity in each of
the four quadrants defined by the combinations of positive and
negative X and Y inputs. This results in the following equation,
where X and Y are high impedance differential inputs:
To accomplish this the differential input voltages are first con-
verted into differential currents by the X and Y input transcon-
ductance stages. The currents are then scaled by a constant
reference and combined in the multiplier core. The multiplier
core is a basic Gilbert Cell that produces a differential output
current proportional to the product of X and Y input signal cur-
rents. This current is converted into the output for the HA-2557.
The purpose of the reference circuit is to provide a stable cur-
rent, used in setting the scale factor. This is achieved with a
bandgap reference circuit to produce a temperature stable
voltage of 1.2V which is forced across a NiCr resistor. Slight
adjustments to scale factor may be possible by overriding the
Output Resistance
Output Capacitance
Internal Resistor (R
Z
)
±
10V
25
25
25
Full
1.0
-
2425
2375
1.5
6.5
2500
2500
-
-
M
pF
2575
2625
POWER SUPPLY
+PSRR
-PSRR
Supply Current
NOTES:
2. Error is percent of full scale, 1% = 16
μ
A.
3. V
XCM
=
±
10V, V
YCM
= +9V, -10V.
4. Relative to full scale output.
V
S
=
±
12V to
±
17V
V
S
=
±
12V to
±
17V
Full
Full
Full
65
45
-
80
55
13
-
-
dB
dB
mA
17
FIGURE 1. AC AND TRANSIENT RESPONSE TEST CIRCUIT
V
Y
TRANSIENT RESPONSE
Electrical Specifications
V
SUPPLY
=
±
15V, Unless Otherwise Specified
(Continued)
PARAMETER
TEST CONDITIONS
TEMP.
(
o
C)
HA-2557-9
TYP
UNITS
MIN
MAX
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
+15V
V
OUT
NC
NC
NC
-15V
50
NC
V
Y
+
V
X
+
REF
NC
NC
NC
NC
X
Y
X
Vertical Scale: Top 5V/Div.
Horizontal Scale: 20ns/Div.
Bottom: 100mV/Div.
I
OUT
------------------
=
HA-2557
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相關(guān)代理商/技術(shù)參數(shù) |
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| HA2557/883 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Wideband Four Quadrant Analog Multiplier (Current Output) |
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