OP249 Datasheet, PDF (10/17 Pages) Analog Devices – Dual, Precision JFET High Speed Operational Amplifier

OP249
+IN
–IN
V+
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
V_{OUT 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.
V–
Figure 39. Simplified Schematic (1/2 OP249)
1/2
OP249
+3V
5k⍀
+18V
1/2
OP249
+3V
5k⍀
–18V
Figure 40. Burn-In Circuit
A) OP249
B) LT1057
C) AD712
Figure 41. Large-Signal Transient Response, A_V = +1,
V_IN = 20 V p-p, Z_L = 2 kΩ//200 pF, V_S = ±15 V
–10–
REV. C