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LTC6255 Datasheet(PDF) 13 Page - Linear Technology

Part No. LTC6255
Description  1.3MHz, 20μA Power Efficient Rail-to-Rail I/O Op Amps
Download  28 Pages
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC6255 Datasheet(HTML) 13 Page - Linear Technology

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LTC6258/LTC6259/LTC6260
6258960fa
13
For more information www.linear.com/LTC6258
OPERATION
The LTC6258 family input signal range extends beyond the
negative and positive power supplies. Figure 1 depicts a
Simplified Schematic of the amplifier. The input stage is
comprised of two differential amplifiers, a PNP stage Q1/
Q2 and NPN stage Q3/Q4 that are active over different
ranges of common mode input voltage. The PNP stage
is active between the negative power supply to approxi-
mately 1V below the positive supply. As the input voltage
approaches the positive supply, transistor Q5 will steer the
tail current I1 to the current mirror Q6/Q7, activating the
NPN differential pair and the PNP pair becomes inactive
for the remaining input common mode range. Also for the
input stage, devices Q17, Q18 and Q19 act to cancel the
bias current of the PNP input pair. When Q1/Q2 is active,
the current in Q16 is controlled to be the same as the
current Q1/Q2. Thus, the base current of Q16 is normally
equal to the base current of the input devices of Q1/Q2.
Similar circuitry (not shown) is used to cancel the base
current of Q3/Q4. The buffer and output bias stage uses
a special compensation technique to take full advantage
of the process technology to drive high capacitive loads.
The common emitter topology of Q14/Q15 enables the
output to swing from rail to rail.


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