LM614 datasheet(14/17 Pages) NSC

14 / 17 page

Application Information (Continued)

Cross-over Distortion: The LM614 has lower cross-over

distortion (a 1 V

BE deadband versus 3 VBE for the

LM124), and increased slew rate as shown in the char-

acteristic curves. A resistor pull-up or pull-down will force

class-A operation with only the PNP or NPN output tran-

sistor conducting, eliminating cross-over distortion

Capacitive Drive: Limited by the output pole caused by

the output resistance driving capacitive loads, a

pull-down resistor conducting 1 mA or more reduces the

output stage NPN r

e until the output resistance is that of

the current limit 25

Ω. 200 pF may then be driven without

oscillation.

Op Amp Input Stage

The lateral PNP input transistors, unlike most op amps, have

EBO equal to the absolute maximum supply voltage. Also,

they have no diode clamps to the positive supply nor across

the inputs. These features make the inputs look like high im-

pedances to input sources producing large differential and

common-mode voltages.

Typical Applications

DS009326-42

FIGURE 12. Simple Low Quiescent Drain Voltage

Regulator. Total supply current approximately 320 µA,

when V

IN = +5V.

DS009326-43

*10k must be low

t.c. trimpot.

FIGURE 13. Ultra Low Noise 10.00V Reference. Total

output noise is typically 14 µV

RMS.

DS009326-44

VOUT = (R1 /Pe+1)VREF

R1,R2 should be 1% metal film

Pβ should be low T.C. trim pot

FIGURE 14. Slow Rise Time Upon Power-Up,

Adjustable Transducer Bridge Driver.

Rise time is approximately 1 ms.

DS009326-46

FIGURE 15. Low Drop-Out Voltage Regulator Circuit,

drop-out voltage is typically 0.2V.

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