LT1490A
APPLICATIO S I FOR ATIO
Gain
The open-loop gain is almost independent of load when
the output is sourcing current. This optimizes performance
TYPICAL APPLICATIO S
Square Wave Oscillator
5V
100k
59k
+
100k
1/2 LT1490A
V
OUT
–
R
50k
C
0.1µF
1490A TA02
f= 1
2RC
V
OUT
= 5V
P-P
WITH 5V SUPPLY
I
S
= 200µA
AT V
S
= 5V, R = 50k, C = 1nF
OUTPUT IS 5kHz SLEW LIMITED TRIANGLE WAVE
SI PLIFIED SCHE ATIC
V
+
Q1
D1
R1
30k
Q4
– IN
Q17
Q20
OUT
Q16
Q15
Q9
Q10
Q13
Q14
Q21
Q18
R3
1k
2µA
+IN
Q7
Q8
Q11
Q12
R2
1k
D2
Q2
D3
Q3
Q22
+
Q5
Q6
D4
D5
ONE AMPLIFIER
U
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.
Optional Output Compensation for
Capacitive Loads Greater Than 200pF
V
IN
W
U
W
U U
+
1/2 LT1490A
–
C
L
≤
10,000pF
0.22µF
150Ω
1490A TA04
W
Q19
R4
40k
R5
40k
V
–
1490A SS
9
LINER [ LINEAR TECHNOLOGY ]
