Datasheet

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