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LT1490 View Datasheet(PDF) - Linear Technology

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Description
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LT1490 Datasheet PDF : 12 Pages
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LT1490/LT1491
APPLICATIONS INFORMATION
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.
TYPICAL APPLICATIONS
Square Wave Oscillator
5V
100k
100k
59k
+
1/2 LT1490
R
50k
C
0.1µF
1490/91 TA02
VOUT
f= 1
2RC
VOUT = 5VP-P WITH 5V SUPPLY
IS = 200µA
AT VS = 5V, R = 50k, C = 1nF
OUTPUT IS 5kHz SLEW LIMITED TRIANGLE WAVE
Optional Output Compensation for
Capacitive Loads Greater Than 200pF
VIN
+
1/2 LT1490
CL 10,000pF
0.22µF
150
1490/91 TA04
W
W
SI PLIFIED SCHE ATIC
Q1
R1
30k
Q4
+
2µA
R2
1k
– IN
R3
1k
+ IN
Q2
D1
D2
Q7 Q8
Q11 Q12
Q9
Q10
Q13
Q3
D3
V+
Q22
Q15
Q14
Q19
Q17
Q16 Q18
Q20
OUT
Q21
Q5
Q6
ONE AMPLIFIER
D4 D5
R4
R5
40k
40k
V
1490/91 SS
9
 

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