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LT1466 Datasheet

  • LT1466

  • Linear Technology [Micropower Dual/Quad Precision Rail-to-R...

  • LINER

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LT1466L/LT1467L
TYPICAL PERFORMANCE CHARACTERISTICS
Channel Separation vs Frequency
130
120
CHANNEL SEPARATION (dB)
V
S
=
鹵
15V
110
100
90
80
70
60
50
40
30
100
1k
10k
FREQUENCY (Hz)
100k
1466L/67L G24
APPLICATIONS INFORMATION
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
V
+
I
1
Q12
C1
Q5
+ IN
鈥?IN
Q3 Q4
Q1 Q2
V
BIAS
V
+
Q7
Q8
BUFFER AND
OUTPUT BIAS
Q9
C2
Q10
Q11
C
C
OUT
V
鈥?/div>
Q6
D1
V
鈥?/div>
1466L/67L F01
Figure 1. Simplified Schematic
8
U
W
U W
Small-Signal Response
V
S
=
鹵2.5V
Large-Signal Response
V
S
=
鹵5V
V
S
=
鹵2.5V
A
V
= 1
1466L/67L G22
V
S
=
鹵5V
A
V
= 1
1466L/67L G23
U
U
Technology鈥檚 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
Q13

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