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參數資料
| 型號： | LM194 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | LM194/LM394 Supermatch Pair |
| 中文描述： | LM194/LM394的Supermatch配對 |
| 文件頁數： | 1/10頁 |
| 文件大小： | 221K |
| 代理商： | LM194 |
TL/H/9241
L
December 1994
LM194/LM394 Supermatch Pair
General Description
The LM194 and LM394 are junction isolated ultra well-
matched monolithic NPN transistor pairs with an order of
magnitude improvement in matching over conventional tran-
sistor pairs. This was accomplished by advanced linear pro-
cessing and a unique new device structure.
Electrical characteristics of these devices such as drift ver-
sus initial offset voltage, noise, and the exponential relation-
ship of base-emitter voltage to collector current closely ap-
proach those of a theoretical transistor. Extrinsic emitter
and base resistances are much lower than presently avail-
able pairs, either monolithic or discrete, giving extremely low
noise and theoretical operation over a wide current range.
Most parameters are guaranteed over a current range of
1
m
A to 1 mA and 0V up to 40V collector-base voltage,
ensuring superior performance in nearly all applications.
To guarantee long term stability of matching parameters,
internal clamp diodes have been added across the emitter-
base junction of each transistor. These prevent degradation
due to reverse biased emitter currentDthe most common
cause of field failures in matched devices. The parasitic iso-
lation junction formed by the diodes also clamps the sub-
strate region to the most negative emitter to ensure com-
plete isolation between devices.
The LM194 and LM394 will provide a considerable improve-
ment in performance in most applications requiring a closely
matched transistor pair. In many cases, trimming can be
eliminated entirely, improving reliability and decreasing
costs. Additionally, the low noise and high gain make this
device attractive even where matching is not critical.
The LM194 and LM394/LM394B/LM394C are available in
an isolated header 6-lead TO-5 metal can package. The
LM394/LM394B/LM394C are available in an 8-pin plastic
dual-in-line package. The LM194 is identical to the LM394
except for tighter electrical specifications and wider temper-
ature range.
Features
Y
Emitter-base voltage matched to 50
m
V
Y
Offset voltage drift less than 0.1
m
V/
§
C
Y
Current gain (h
FE
) matched to 2%
Y
Common-mode rejection ratio greater than 120 dB
Y
Parameters guaranteed over 1
m
A to 1 mA collector
current
Y
Extremely low noise
Y
Superior logging characteristics compared to
conventional pairs
Y
Plug-in replacement for presently available devices
Typical Applications
Low Cost Accurate Square Root Circuit
I
OUT
e
10
b
5
.
10 V
IN
TL/H/9241–1
*
Trim for full scale accuracy
Low Cost Accurate Squaring Circuit
I
OUT
e
10
b
6
(V
IN
)
2
TL/H/9241–2
C
1995 National Semiconductor Corporation
RRD-B30M115/Printed in U. S. A.
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