OP293FSZ Analog Devices Inc, OP293FSZ Datasheet - Page 17

• Manufacturer Part Number: OP293FSZ
• Description: IC OPAMP GP 35KHZ DUAL 8SOIC
• Manufacturer: Analog Devices Inc
• Type: General Purpose Amplifierr

Specifications of OP293FSZ

• Slew Rate: 0.015 V/µs
• Design Resources: 4 mA-to-20 mA Loop-Powered Temperature Monitor Using ADuC7060/1 (CN0145)
• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Gain Bandwidth Product: 35kHz
• Current - Input Bias: 20nA
• Voltage - Input Offset: 250µV
• Current - Supply: 30µA
• Current - Output / Channel: 25mA
• Voltage - Supply, Single/dual (±): 1.7 V ~ 36 V, ±0.85 V ~ 18 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Op Amp Type: Precision
• No. Of Amplifiers: 2
• Bandwidth: 35kHz
• Supply Voltage Range: 2V To ± 18V
• Amplifier Case Style: SOIC
• No. Of Pins: 8
• Rail/rail I/o Type: No
• Number Of Elements: 2
• Unity Gain Bandwidth Product: 0.035MHz
• Common Mode Rejection Ratio: 96dB
• Input Offset Voltage: 250uV
• Input Bias Current: 20nA
• Single Supply Voltage (typ): 3/5/9/12/15/18/24/28V
• Voltage Gain In Db: 106.02dB
• Power Supply Rejection Ratio: 97dB
• Power Supply Requirement: Single/Dual
• Shut Down Feature: No
• Single Supply Voltage (min): 2V
• Single Supply Voltage (max): 36V
• Dual Supply Voltage (min): ±1V
• Dual Supply Voltage (max): ±18V
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: SOIC N
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Compliant

From the formulas, it can be seen that if the span trim is adjusted
before the zero trim, the two trims are not interactive, which
greatly simplifies the calibration procedure.
Calibration of the transmitter is simple. First, the slope of the
output current vs. temperature is calibrated by adjusting the
span trim, R7. A couple of iterations may be required to be sure
the slope is correct.
When the span trim has been adjusted, the zero trim can be
made. Adjusting the zero trim does not affect the gain.
The zero trim can be set at any known temperature by adjusting
R5 until the output current equals:
Table 7 shows the values of R6 required for various temperature
ranges.
Table 7. R6 Values vs. Temperature
Temp Range
0°C to 70°C
−40°C to +85°C
−55°C to +150°C
A MICROPOWER VOLTAGE CONTROLLED
OSCILLATOR
The OP293 CMOS analog switch forms the precision VCO of
Figure 36. This circuit provides triangle and square wave
outputs and draws only 50 μA from a single 5 V supply. A1 acts
as an integrator; S1 switches the charging current symmetrically
to yield positive and negative ramps. The integrator is bounded
by A2, which acts as a Schmitt trigger with a precise hysteresis
of 1.67 V, set by Resistor R5, Resistor R6, and Resistor R7, and
associated CMOS switches. The resulting output of A1 is a
triangle wave with upper and lower levels of 3.33 V and 1.67 V.
The output of A2 is a square wave with almost rail-to-rail swing.
With the components shown, frequency of operation is given by
the equation:
However, the frequency can easily be changed by varying C1.
The circuit operates well up to 500 Hz.
f
I
OUT
OUT
= V
=




CONTROL
∆
T
OPERATING
∆
I
V × 10 Hz/V
FS




(
T
AMBIENT
−
T
MIN
)
+
R6
10 kΩ
6.2 kΩ
3 kΩ
4
mA
Rev. C | Page 17 of 20
V
CONTROL
1
2
3
4
5
6
7
200kΩ
200kΩ
100kΩ
IN/OUT
OUT/IN
OUT/IN
IN/OUT
CONT
CONT
V
Figure 36. Micropower Voltage Controlled Oscillator
R1
R2
SS
R3
CD4066
R4
200kΩ
S1
S2
S3
S4
2
3
75nF
C1
1/2 OP293
–
+
200kΩ
R8
A1
5V
8
4
IN/OUT
OUT/IN
OUT/IN
IN/OUT
CONT
CONT
V
1
TRIANGLE
DD
5V
OUT
200kΩ
14
13
12
11
10
9
8
R6
5V
5V
5V
R5
200kΩ
OP193/OP293
6
5
1/2 OP293
–
+
A2
R7
200kΩ
7
SQUARE
OUT