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OP193FS-REEL

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
OP193/OP293 Data Sheet
A SINGLE-SUPPLY INSTRUMENTATION AMPLIFIER
Designing a true single-supply instrumentation amplifier with
zero-input and zero-output operation requires special care. The
traditional configuration, shown in Figure 33, depends upon
Amplifier A1’s output being at 0 V when the applied common-
mode input voltage is at 0 V. Any error at the output is multiplied
by the gain of A2. In addition, current flows through Resistor R3
as A2’s output voltage increases. A1’s output must remain at 0 V
while sinking the current through R3, or a gain error results. With
a maximum output voltage of 4 V, the current through R3 is
only 2 μA, but this still produces an appreciable error.
5V
V+
V–
5V
+
–
+
–
V+
V–
R1
20kΩ
R2
1.98MΩ
–IN
+IN
V
OUT
R4
1.98MΩ
R3
20kΩ
I
SINK
A1
1/2 OP293
A2
1/2 OP293
00295-033
Figure 33. A Conventional Instrumentation Amplifier
One solution to this problem is to use a pull-down resistor. For
example, if R3 = 20 kΩ, then the pull-down resistor must be less
than 400 Ω. However, the pull-down resistor appears as a fixed
load when a common-mode voltage is applied. With a 4 V
common-mode voltage, the additional load current is 10 mA,
which is unacceptable in a low power application.
Figure 34 shows a better solution. A1’s sink current is provided
by a pair of N-channel FET transistors, configured as a current
mirror. With the values shown, the sink current of Q2 is about
340 μA. Thus, with a common-mode voltage of 4 V, the addi-
tional load current is limited to 340 μA vs. 10 mA with a 400 Ω
resistor.
5V
V+
V–
5V
Q1 Q2
5V
+
–
+
–
V+
V–
R1
20kΩ
R2
1.98MΩ
A1
1/2 OP293
A2
1/2 OP293
–IN
+IN
V
OUT
R3
20kΩ
10kΩ
R4
1.98MΩ
VN2222
00295-034
Figure 34. An Improved Single-Supply, 0 V
IN
, 0 V
OUT
Instrumentation Amplifier
A LOW POWER, TEMPERATURE TO 4 mA TO 20 mA
TRANSMITTER
A simple temperature to 4 mA to 20 mA transmitter is shown
in Figure 35. After calibration, this transmitter is accurate to
±0.5°C over the −50°C to +150°C temperature range. The
transmitter operates from 8 V to 40 V with supply rejection
better than 3 ppm/V. One half of the OP293 is used to buffer
the TEMP pin, and the other half regulates the output current
to satisfy the current summation at its noninverting input.
( )
×
++
−
×
+×
+
102
762
102
76
RR
RRR
V
RR
RRV
I
SET
TEMP
OUT
The change in output current with temperature is the derivative
of the following transfer function:
( )
102
76
R
R
RR
T
V
T
I
TEMP
OUT
×
+
∆
∆
=
∆
∆
NOTES
1. ALL RESISTORS 1/4 W, 5% UNLESS OTHERWISE NOTED.
SPAN TRIM
8
4
V
TEMP
2N1711
1
2
3
REF43GPZ
6
5
7
1N4002
R
LOAD
I
OUT
V+
8V TO 40V
R10
100Ω
1%, 1/2 W
R8
1kΩ
R9
100kΩ
V
SET
R4
20kΩ
R6
3kΩ
R7
5kΩ
ZERO
TRIM
R5
5kΩ
R2
1kΩ
1/2
OP293
–
+
1/2
OP293
–
+
R3
100kΩ
R1, 10kΩ
V
IN
V
OUT
TEMP
GND
2
6
3
4
00295-035
Figure 35. Temperature to 4 mA to 20 mA Transmitter
Rev. D | Page 16 of 20
Data Sheet OP193/OP293
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:
( )
mA4+−
∆
∆
=
MIN
AMBIENT
OPERATING
FS
OUT
TT
T
I
I
Table 7 shows the values of R6 required for various temperature
ranges.
Table 7. R6 Values vs. Temperature
Temp Range R6
0°C to 70°C 10 kΩ
−40°C to +85°C 6.2 kΩ
−55°C to +150°C 3 kΩ
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:
f
OUT
= V
CONTROL
V × 10 Hz/V
However, the frequency can easily be changed by varying C1.
The circuit operates well up to 500 Hz.
8
4
1
2
3
6
5
7
5V
S3
S4
S1
1
IN/OUT
2
OUT/IN
CONT
12
OUT/IN
10
3
OUT/IN
S2
CONT
13
4
IN/OUT
6
CONT
5
CONT
7
IN/OUT
8
IN/OUT
11
OUT/IN
9
14
5V
5V
CD4066
5V
–
+
–
+
5V
SQUARE
OUT
TRIANGLE
OUT
A1
1/2 OP293
A2
1/2 OP293
C1
75nF
R5
200kΩ
R1
200kΩ
R7
200kΩ
R6
200kΩ
R8
200kΩ
R4
200kΩ
R3
100kΩ
R2
200kΩ
V
CONTROL
V
DD
V
SS
00295-036
Figure 36. Micropower Voltage Controlled Oscillator
Rev. D | Page 17 of 20
OP193/OP293 Data Sheet
OUTLINE DIMENSIONS
C
O
N
T
R
O
L
L
I
N
G
D
I
M
E
N
S
I
O
N
S A
RE
I
N M
I
LL
IM
E
TE
RS
;
IN
CH
D
IM
E
NS
IO
N
S
(
I
N
P
A
R
E
N
T
H
E
S
E
S
)
A
R
E
R
O
U
N
D
ED
-
OF
F M
I
LL
IM
E
TE
R
EQ
UI
V
AL
EN
T
S F
OR
R
E
F
E
R
E
N
C
E
O
N
L
Y
A
N
D
A
R
E
N
O
T
A
P
P
R
OP
RI
A
TE
F
OR
US
E
IN
DE
S
IG
N.
CO
MP
L
IA
N
T T
O J
E
DE
C S
T
AN
DA
R
DS
M
S-
01
2
-
A
A
0
1
2
4
0
7-
A
0
.2
5
(0
.0
0
98
)
0
.
1
7
(
0
.
0
0
6
7
)
1
.
27
(0
.
05
00
)
0
.
4
0
(
0
.
0
1
5
7
)
0
.
5
0
(
0
.
0
1
9
6
)
0.
2
5
(
0
.
0
0
9
9
)
45
°
8
°
0°
1
.
7
5
(
0
.
0
6
8
8
)
1.
3
5
(
0
.
0
5
3
2
)
S
E
A
T
I
N
G
P
L
A
N
E
0
.
2
5
(
0
.
0
0
9
8
)
0
.
10
(0
.
00
4
0
)
4
1
8
5
5.
0
0 (
0.
1
96
8)
4
.
8
0
(
0
.
1
8
9
0
)
4
.0
0 (
0
.
1
5
7
4
)
3
.
8
0
(
0
.
1
4
9
7
)
1
.
2
7
(
0
.
0
5
0
0
)
B
S
C
6
.
2
0
(
0
.
2
4
4
1
)
5
.8
0 (
0
.
2
2
8
4
)
0
.
5
1
(
0
.
0
2
0
1
)
0
.
3
1
(
0
.0
1
22
)
C
O
P
L
A
N
A
R
I
T
Y
0
.
1
0
Figure 37. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body (R-8)
Dimensions shown in millimeters and (inches)
ORDERING GUIDE
Model
1
Temperature Range Package Description Package Option
OP193FS-REEL −40°C to +125°C 8-Lead SOIC_N S-Suffix (R-8)
OP193FSZ −40°C to +125°C 8-Lead SOIC_N S-Suffix (R-8)
OP193FSZ-REEL −40°C to +125°C 8-Lead SOIC_N S-Suffix (R-8)
OP193FSZ-REEL7 −40°C to +125°C 8-Lead SOIC_N S-Suffix (R-8)
OP293ESZ −40°C to +125°C 8-Lead SOIC_N S-Suffix (R-8)
OP293ESZ-REEL −40°C to +125°C 8-Lead SOIC_N S-Suffix (R-8)
OP293ESZ-REEL7 −40°C to +125°C 8-Lead SOIC_N S-Suffix (R-8)
OP293FSZ −40°C to +125°C 8-Lead SOIC_N S-Suffix (R-8)
OP293FSZ-REEL
−40°C to +125°C
8-Lead SOIC_N
S-Suffix (R-8)
OP293FSZ-REEL7 −40°C to +125°C 8-Lead SOIC_N S-Suffix (R-8)
1
Z = RoHS Compliant Part.
Rev. D | Page 18 of 20
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

OP193FS-REEL

Mfr. #:
Buy OP193FS-REEL
Manufacturer:
Analog Devices Inc.
Description:
Precision Amplifiers Prec Micropower SGL 1.7-18V
Lifecycle:
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