LT1366/LT1367

LT1368/LT1369



1366fb

Typical perForMance characTerisTics

(The data presented here applies to the LT1366/LT1367/LT1368/LT1369 unless otherwise noted.)

THD + Noise vs Frequency

Large-Signal Response

(LT1366/LT1367)

Small-Signal Response

(LT1366/LT1367)

FREQUENCY (kHz)

0.01

0.001

0.01

0.1

1

0.1

1

10

LT1366 TPC28

0V

100µs/DIV

LT1366 TPC29

UNITY GAIN

2µs/DIV

LT1366 TPC30

UNITY GAIN

applicaTions inForMaTion

Rail-to-Rail Operation

TheLT1366familydiffersfromconventionalopampsinthe

design of both the input and output stages. Figure 1 shows

a simplified schematic of the amplifier. The input stage

consists of two differential amplifiers, a PNP stage Q1/Q2

and an NPN stage Q3/Q4, which are active over different

portionsoftheinputcommonmoderange.Lateraldevices

are used in both input stages, eliminating the need for

clamps across the input pins. Each input stage is trimmed

for offset voltage. A complementary output configuration

(Q23 through Q26) is employed to create an output stage

with rail-to-rail swing. The amplifier is fabricated on Linear

Q24

D7

Q23

Q25

C1

C2

Q26

D8

Q22

Q21

D6

Q17

Q16

Q18

Q15

Q19

Q20

D5

D4

D7

Q11

Q10

Q14

Q13

Q9

Q8

Q7

D2

Q1 Q2

Q5

D1

Q3 Q4

Q6

D3

Q12

OUT

– 300mV

LT1366 FO1

Figure 1. LT1366 Simplified Schematic Diagram