LT1782CS5 datasheet(12/16 Pages) LINER

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LT1782

typically 100dB. When the LT1782 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 LT1782 should be

operated single supply, with the output always sourcing

current and with the input voltage swing between ground

and (V+ – 0.8V). See the Typical Performance Character-

istics curves, “Total Harmonic Distortion + Noise vs Ouput

Voltage Amplitude.”

Gain

The open-loop gain is almost independent of load when

the output is sourcing current. This optimizes perfor-

Q10

40k

–IN

+IN

Q11

Q12

Q13

Q14

30k

40k

Q15

Q19

Q16

Q18

Q22

V +

Q17

Q20

Q21

OUT

SHDN

V –

1782 SS

µA

Q23

Q24

Q25

Q26

mance in single supply applications where the load is

returned to ground. The typical performance curve of

open-loop gain for various loads shows the details.

Shutdown

The 6-lead part includes a shutdown feature that disables

the part, reducing quiescent current and making the output

high impedance. The part can be shut down by bringing the

SHDN pin 1.2V or more above V –. When shut down, the

supply current is about 5

µA and the output leakage current

is less than 1

µA (V– ≤ VOUT ≤ V+). In normal operation, the

SHDN pin can be tied to V – or left floating. See the Typical

Performance Characteristics curves, “Supply Current vs

Shutdown Pin Voltage.”

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