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參數(shù)資料
| 型號： | LH0094CD |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬運算功能 |
| 英文描述： | Multifunction Converter |
| 中文描述： | ANALOG MULTIPLE FUNCTIONS, 0.01 MHz BAND WIDTH, MDIP16 |
| 封裝： | METAL CAN, DIP-16 |
| 文件頁數(shù)： | 3/10頁 |
| 文件大小： | 189K |
| 代理商： | LH0094CD |
Applications Information
GENERAL INFORMATION
Power supply bypass capacitors (0.1
m
F) are recommended
for all applications.
The LH0094 series is designed for positive input signals
only. However, negative input up to the supply voltage will
not damage the device.
A clamp diode (Figure 1) is recommended for those applica-
tions in which the inputs may be subjected to open circuit or
negative input signals.
For basic applications (multiply, divide, square, square root)
it is possible to use the device without any external adjust-
ments or components. Two matched resistors are provided
internally to set m for square or square root.
When using external resistors to set m, such resistors
should be as close to the device as possible.
SELECTION OF RESISTORS TO SET m
Internal Matched Resistors
R
A
and R
B
are matched internal resistors. They are
100
X
g
10%, but matched to 0.1%.
(a) m
e
2
*
(b) m
e
0.5
*
TL/H/5695–2
*
No external resistors required, strap as indicated
External Resistors
The exponent is set by 2 external resistors or it may be
continuously varied by a single trim pot. (R1
a
R2
s
500
X
.
(a) m
e
1
TL/H/5695–3
(b) m
k
1
m
e
R2
R1
a
R2R1
a
R2
&
200
X
(c) m
l
1
m
e
R1
a
R2
R2
TL/H/5695–4
ACCURACY (ERROR)
The accuracy of the LH0094 is specified for both externally
adjusted and unadjusted cases.
Although it is customary to specify the errors in percent of
full-scale (10V), it is seen from the typical performance
curves that the actual errors are in percent of reading. Thus,
the specified errors are overly conservative for small input
voltages. An example of this is the LH0094 used in the mul-
tiplication mode. The specified typical error is 0.25% of full-
scale (25 mV). As seen from the curve, the unadjusted error
is
&
25 mV at 10V input, but the error is less than 10 mV for
inputs up to 1V. Note also that if either the multiplicand or
the multiplier is at less than 10V, (5V for example) the unad-
justed error is less. Thus, the errors specified are at full-
scaleDthe worst case.
The LH0094 is designed such that the user is able to exter-
nally adjust the gain and offset of the deviceDthus trim out
all of the errors of conversion. In most applications, the gain
adjustment is the only external trim needed for super accu-
racyDexcept in division mode, where a denominator offset
adjust is needed for small denominator voltages.
EXPONENTS
The LH0094 is capable of performing roots to 0.1 and pow-
ers up to 10. However, care should be taken when applying
these exponentDotherwise, results may be misinterpreted.
For example, consider the
(/10
th power of a number: i.e.,
0.001 raised to 0.1 power is 0.5011; 0.1 raised to the 0.1
power is 0.7943; and 10 raised to the 0.1 power is 1.2589.
Thus, it is seen that while the input has changed 4 decades,
the output has only changed a little more than a factor of 2.
It is also seen that with as little as 1 mV of offset, the output
will also be greater than zero with zero input.
3
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