LT1490/LT1491
U
W U U
APPLICATIONS INFORMATION
Gain
mance in single supply applications where the load is
returned to ground. The typical performance photo of
Open-Loop Gain for various loads shows the details.
The open-loop gain is almost independent of load when
the output is sourcing current. This optimizes perfor-
U
TYPICAL APPLICATIONS
Square Wave Oscillator
Optional Output Compensation for
Capacitive Loads Greater Than 200pF
59k
5V
100k
100k
+
V
IN
+
1/2 LT1490
1/2 LT1490
V
OUT
C
L
≤ 10,000pF
–
–
R
50k
C
1490/91 TA02
0.22µF
150Ω
0.1µF
1
2RC
f =
1490/91 TA04
V
OUT
= 5V WITH 5V SUPPLY
P-P
I
= 200µA
S
AT V = 5V, R = 50k, C = 1nF
S
OUTPUT IS 5kHz SLEW LIMITED TRIANGLE WAVE
W
W
SI PLIFIED SCHE ATIC
+
V
Q2
Q1
Q3
Q22
D1
D2
D3
R1
30k
R2
1k
Q19
Q4
–IN
+IN
Q17
Q18
Q20
OUT
Q7
Q8
Q11 Q12
R3
1k
+
Q16
2µA
Q15
Q9
Q10
Q13
Q14
Q21
R4
40k
R5
40k
Q5
Q6
D4
D5
–
V
ONE AMPLIFIER
1490/91 SS
9
Linear [ Linear ]
