LT1797IS5 查看數據表（PDF） - Linear Technology

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LT1797IS5

10MHz, Rail-to-Rail Input and Output Op Amp in SOT-23

Linear Technology 

LT1797

APPLICATIONS INFORMATION

Distortion

There are two main contributors to distortion in op amps:

output crossover distortion as the output transitions from

sourcing to sinking current and distortion caused by non-

linear common mode rejection. If the op amp is operating

in the inverting mode, there is no common mode induced

distortion. If the op amp is operating in the PNP input stage

(input is not within 1.3V of V+), the CMRR is very good,

typically 96dB. When the LT1797 switches between input

stages there is significant nonlinearity in the CMRR. Lower

load resistance increases the output crossover distortion,

but has no effect on the input stage transition distortion.

For lowest distortion the LT1797 should be operated single

supply, with the output always sourcing current and with

the input voltage swing between ground and (V+ – 1.3V).

See the Typical Performance Characteristic curves.

I1

Q18

Q17

BIAS

R5

–IN

D1

R6

+IN

R1

R2

QB1

Q1

Q2

D2

1/2 SUPPLY

Q15 Q16

Q13

Q14

Q9 Q10

I2

I3

I7

R7

+1

Q3 Q4

I4

I5

Q7 Q8

Q11

Q12

Q5

Q6

R3 R4

I6

Q19

C2

R8

+1

CM

OUT

C1

Q20

1797 F01

Figure 1. Simplified Schematic

1797fb

9

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