OP249

–10–

REV. C

+IN

–IN

V+

V–

Figure 39. Simplified Schematic (1/2 OP249)

1/2

OP249

+3V

5k

+18V

–18V

1/2

OP249

+3V

5k

Figure 40. Burn-In Circuit

APPLICATIONS INFORMATION

The OP249 represents a reliable JFET amplifier design, featur-

ing an excellent combination of dc precision and high speed. A

rugged output stage provides the ability to drive a 600

Ω load

and still maintain a clean ac response. The OP249 features a

large signal response that is more linear and symmetric than

previously available JFET input amplifiers—compare the

OP249’s large-signal response, as illustrated in Figure 41, to

other industry standard dual JFET amplifiers.

Typically, JFET amplifier’s stewing performance is simply specified

as just a number of volts/

µs. There is no discussion on the qual-

ity, i e., linearity, symmetry, etc., of the stewing response.

A) OP249

B) LT1057

C) AD712