OP490GSZ-REEL Analog Devices Inc, OP490GSZ-REEL Datasheet - Page 10

• Manufacturer Part Number: OP490GSZ-REEL
• Description: IC,Operational Amplifier,QUAD,BIPOLAR,SOP,16PIN,PLASTIC
• Manufacturer: Analog Devices Inc

Specifications of OP490GSZ-REEL

• Amplifier Type: General Purpose
• Number Of Circuits: 4
• Slew Rate: 0.012 V/µs
• Gain Bandwidth Product: 20kHz
• Current - Input Bias: 4.2nA
• Voltage - Input Offset: 600µV
• Current - Supply: 60µA
• Voltage - Supply, Single/dual (±): 1.6 V ~ 36 V, ±0.8 V ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Current - Output / Channel: -
• -3db Bandwidth: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: OP490GSZ-REELTR

OP490
INPUT VOLTAGE PROTECTION
The OP490 uses a PNP input stage with protection resistors in
series with the inverting and noninverting inputs. The high
breakdown of the PNP transistors coupled with the protection
resistors provides a large amount of input protection, allowing
the inputs to be taken 20 V beyond either supply without
damaging the amplifier.
MICROPOWER VOLTAGE-CONTROLLED
OSCILLATOR
An OP490 in combination with an inexpensive quad CMOS
switch comprise the precision V
provides triangle and square wave outputs and draws only 75 μA
from a 5 V supply. A acts as an integrator; S1 switches the
V
CONTROL
200kΩ
200kΩ
R1
R2
100kΩ
R3
CO
2
3
4
5
6
7
1
of Figure 22. This circuit
R4
200kΩ
IN/OUT
IN/OUT
CONT
CONT
V
OUT/IN
OUT/IN
SS
2
3
–
OP490
+
1/4
+15V
A
75nF
C1
11
4
Figure 22. Micropower Voltage Controlled Oscillator
S1
S2
S3
S4
1
Rev. E | Page 10 of 16
IN/OUT
OUT/IN
OUT/IN
IN/OUT
TRIANGLE
CONT
CONT
V
OUT
DD
14
13
12
11
10
9
8
+5V
charging current symmetrically to yield positive and negative
ramps. The integrator is bounded by B, which acts as a Schmitt
trigger with a precise hysteresis of 1.67 V, set by Resistors R5,
R6, and R7, and the associated CMOS switches. The resulting
output of A is a triangle wave with upper and lower levels of
3.33 V and 1.67 V. The output of B is a square wave with almost
rail-to-rail swing. With the components shown, frequency of
operation is given by the equation
but this is easily changed by varying C1. The circuit operates
well up to a few hundred hertz.
+5V
f
OUT
200kΩ
R8
= V
CONTROL
+5V
200kΩ
200kΩ
R5
R6
+15V
(Volts) × 10 Hz/V
6
5
–
+
OP490
R7
200kΩ
1/4
B
7
SQUARE
OUT