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| 型号： | RC4200MT |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 模拟运算功能 |
| 中文描述： | ANALOG MULTIPLIER OR DIVIDER, PDSO8 |
| 封装： | SOIC-8 |
| 文件页数： | 20/25页 |
| 文件大小： | 265K |
| 代理商： | RC4200MT |
RC4200
PRODUCT SPECIFICATION
4
REV. 1.2.1 6/14/01
Notes:
1. Refer to Figure 6 for example.
2. The input circuits tend to become unstable at I1, I2, I4 < 50 A and linearity decreases when I1, I2, I4 > 250 A
(eq. @ I1 = I2 = 500 A, nonlinearity error
≈ 0.5%).
3. These specifications apply with output (I3) connected to an op amp summing junction. If desired, the output (I3) at pin (4) can
be used to drive a resistive load directly. The resistive load should be less than 700
and must be pulled up to a positive
supply such that the voltage on pin (4) stays within a range of 0 to +5V.
Frequency Response,
-3dB point
Supply Voltage
-18
4.0
-15
-9.0
-18
4.0
-15
-9.0
MHz
V
Supply Current
I1 = I2 = I4 = 150 A
TA = +25°C
4.0
mA
Electrical Characteristics (continued)
(Over operating temperature range, VS = -15V unless otherwise noted)
Parameters
Test Conditlons
4200A
4200
Min.
Typ.
Max. Min.
Typ.
Max. Units
Applications Discussion
Current Multiplier/ Divider
The basic design criteria for all circuit congurations using
the RC4200 multiplier is contained in equation (1), that is,
The current-product-balance equation restates this as:
Figure 1. Current Multiplier/Divider
I
3
I
1I2
I
4
---------
=
I
1I2
I
3I4
6
()
=
65-4200-02
RC4200
+VZ
R1
–VS
I3
3
6
4
5
8
7
1
2
I1
I2
I4
R4
VX
VY
+
R2
A
Ammeter
I1 =
VX
R1
I4 =
VZ
R4
I2 =
VY
R2
Dynamic Range and Stability
The precision dynamic range for the RC4200 is from +50
A
to +250 A inputs for I1, I2 and I4. Stability and accuracy
degrade if this range is exceeded.
To improve the stability for input currents less than 50 A,
lter circuits (RSCS) are added to each input (see Figure 2).
Figure 2. Current Multiplier/Divider with Filters
Amplier A1 is used to convert the I3 current to an output
voltage.
Multiplier: Vz = constant
≠ 0
Divider: Vy = constant
≠ 0
65-4200-03
RC4200
VY
R1
R2
I3
–
+
RO
VO
3
6
4
5
8
7
1
2
I2
I1
I4
R4
VX
RS
CS
–VS
+VZ
+VS
RS
CS
A1
RS = 10k Ohms
CS = 0.005
F
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