參數(shù)資料
型號: LT1467L
廠商: Linear Technology Corporation
英文描述: Micropower Dual/Quad Precision Rail-to-Rail Input and Output Op Amps
中文描述: 微雙/四路精密軌到軌輸入和輸出運算放大器
文件頁數(shù): 8/12頁
文件大小: 274K
代理商: LT1467L
8
LT1466L/LT1467L
Figure 1. Simplified Schematic
TYPICAL PERFOR
M
A
CE CHARACTERISTICS
U
Q3
D1
C
C
Q4
Q6
1466L/67L F01
Q1
Q8
Q12
Q13
I
1
V
BIAS
Q2
Q5
–IN
+IN
V
+
V
+
V
V
BUFFER AND
OUTPUT BIAS
C1
C2
OUT
Q7
Q10
Q11
Q9
APPLICATIO
S I
FOR
ATIO
U
Rail-to-Rail Operation
The LT1466L/LT1467L differ from conventional op amps
in the design of both the input and output stages. Figure 1
shows a simplified schematic. The input stage consists of
two differential amplifiers, a PNP stage Q1-Q2 and an NPN
stage Q3-Q4, that are active over different portions of the
input common mode range. Each input stage is trimmed
for offset voltage. A complementary output configuration
(Q12-Q13) is employed to create an output stage with rail-
to-rail swing. The devices are fabricated on Linear
W
U
U
Technology’s proprietary complementary bipolar process,
which ensures very similar DC and AC characteristics for
the output devices Q12 and Q13.
First, looking at the input stage, Q5 switches the current
from current source I
1
between the two input stages.
When the input common mode voltage V
CM
is near the
negative supply, Q5 is reverse biased, so the current from
I
1
becomes the tail current for the PNP differential pair
Q1-Q2. At the other extreme, when V
CM
is near the positive
supply, the PNPs Q1-Q2 are biased off. The current from
Large-Signal Response
V
S
=
±
5V
V
S
=
±
5V
A
V
= 1
1466L/67L G23
FREQUENCY (Hz)
100
C
130
120
110
100
90
80
70
60
50
40
30
1k
10k
100k
V
S
=
±
15V
1466L/67L G24
Channel Separation vs Frequency
1466L/67L G22
V
S
=
±
2.5V
A
V
= 1
Small-Signal Response
V
S
=
±
2.5V
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