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PDF OP493 Data sheet ( Hoja de datos )
| Número de pieza | OP493 | |
| Descripción | Precision / Micropower Operational Amplifiers | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
FEATURES
Operates from +1.7 V to ؎18 V
Low Supply Current: 15 A/Amplifier
Low Offset Voltage: 75 V
Outputs Sink and Source: ؎8 mA
No Phase Reversal
Single or Dual Supply Operation
High Open-Loop Gain: 600 V/mV
Unity-Gain Stable
APPLICATIONS
Digital Scales
Strain Gages
Portable Medical Equipment
Battery Powered Instrumentation
Temperature Transducer Amplifier
GENERAL DESCRIPTION
The OP193 family of single-supply operational amplifiers fea-
tures a combination of high precision, low supply current and
the ability to operate at low voltages. For high performance in
single supply systems the input and output ranges include
ground, and the outputs swing from the negative rail to within
600 mV of the positive supply. For low voltage operation the
OP193 family can operate down to 1.7 volts or ± 0.85 volts.
The combination of high accuracy and low power operation
make the OP193 family useful for battery powered equipment.
Its low current drain and low voltage operation allow it to con-
tinue performing long after other amplifiers have ceased func-
tioning either because of battery drain or headroom.
The OP193 family is specified for single +2 volt through dual
± 15 volt operation over the HOT (–40°C to +125°C) tempera-
ture range. They are available in plastic DIPs, plus SOIC sur-
face mount packages.
*Patent pending.
Precision, Micropower
Operational Amplifiers
OP193/OP293/OP493*
PIN CONFIGURATIONS
8-Lead SO
(S Suffix)
8-Lead Epoxy DIP
(P Suffix)
NULL
–IN A
+IN A
V–
OP193
NC
V+
OUT A
NULL
NULL 1
–IN A 2
+IN A 3
V– 4
OP193
8 NC
7 V+
6 OUT A
5 NULL
NC = NO CONNECT
8-Lead SO
(S Suffix)
OUT A
–IN A
+IN A
V–
OP293
V+
OUT B
–IN B
+IN B
8-Lead Epoxy DIP
(P Suffix)
OUT A 1
–IN A 2
+IN A 3
V– 4
OP293 8 V+
7 OUT B
6 –IN B
5 +IN B
14-Lead Epoxy DIP
(P Suffix)
16-Lead Wide Body SOL
(S Suffix)
OUT A 1
–IN A 2
+IN A 3
V+ 4
+IN B 5
–IN B 6
OUT B 7
OP493
14 OUT D
13 –IN D
12 +IN D
11 V–
10 +IN C
9 –IN C
8 OUT C
OUT A
–IN A
+IN A
V+
+IN B
–IN B
OUT B
NC
OP493
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
NC
NC = NO CONNECT
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
© Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
1 page  
OP193/OP293/OP493
ELECTRICAL SPECIFICATIONS (@ VS = +2.0 V, VCM = 0.1 V, TA = +25؇C unless otherwise noted)
Parameter
Symbol Conditions
“E” Grade
Min Typ Max
“F” Grade
Min Typ Max
INPUT CHARACTERISTICS
Offset Voltage
VOS
Input Bias Current
Input Offset Current
Input Voltage Range
Large Signal Voltage Gain
IB
IOS
VCM
AVO
Long Term Offset Voltage
POWER SUPPLY
Power Supply Rejection Ratio
VOS
PSRR
Supply Current/Amplifier
Supply Voltage Range
NOISE PERFORMANCE
Voltage Noise Density
Current Noise Density
Voltage Noise
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
ISY
VS
en
in
en p-p
SR
GBP
OP193
OP193, –40°C ≤ TA ≤ +125°C
OP293
OP293, –40°C ≤ TA ≤ +125°C
OP493
OP493, –40°C ≤ TA ≤ +125°C
–40°C ≤ TA ≤ +125°C
–40°C ≤ TA ≤ +125°C
RL = 100 kΩ, 0.03 ≤ VOUT ≤ 1 V
–40°C ≤ TA ≤ +125°C
Note 1
75
175
100
175
125
225
15
2
01
60
70
150
150
250
250
350
275
375
20
4
01
60
70
300
VS = +1.7 V to +6 V,
–40°C ≤ TA ≤ +125°C
VCM = 1.0 V, RL = ∞
–40°C ≤ TA ≤ +125°C
100
94
13.2 20
25
+2 ± 18
97
90
13.2 20
25
+2 ± 18
f = 1 kHz
f = 1 kHz
0.1 Hz to 10 Hz
65 65
0.05 0.05
33
RL = 2 kΩ
10 10
25 25
Units
µV
µV
µV
µV
µV
µV
nA
nA
V
V/mV
V/mV
µV
dB
µA
µA
V
nV/√Hz
pA/√Hz
µV p-p
V/ms
kHz
WAFER TEST LIMITS (@ VS = +5.0 V, VCM = 0.1 V, VOUT = 2 V, TA = +25؇C unless otherwise noted)
Parameter
Symbol
Conditions
Limit
Units
Offset Voltage
Input Bias Current
Input Offset Current
Input Voltage Range1
Common-Mode Rejection
Power Supply Rejection Ratio
Large Signal Voltage Gain
Output Voltage Swing High
Output Voltage Swing Low
Supply Current/Amplifier
VOS
IB
IOS
VCM
CMRR
PSRR
AVO
VOH
VOL
ISY
VS = ± 15 V, VOUT = 0 V
VS = +2 V, VOUT = 1.0 V
VCM = 1.0 V
VCM = 1.0 V
0 ≤ VCM ≤ 4 V
VS = ± 1.5 V to ± 18 V
RL = 100 kΩ
IL = 1 mA
IL = –1 mA
VO = 0 V, RL = ∞, VS = ± 18 V
± 75
± 75
20
4
0 to 4
96
100
100
4.1
400
25
µV max
µV max
nA max
nA max
V min
dB min
dB min
V/mV min
V min
mV max
µA max
NOTES
Electrical tests and wafer probe to the limits shown. Due to variations in assembly methods and normal yield loss, yield after packaging is not guaranteed for standard
product dice. Consult factory to negotiate specifications based on dice lot qualifications through sample lot assembly and testing.
1Guaranteed by CMRR test.
Specifications subject to change without notice.
REV. A
–5–
5 Page 
OP193/OP293/OP493
V+
7
2
OP193 6
4
3
5
1
100kΩ
100kΩ
V–
Figure 27. High Resolution Offset Nulling Circuit
A Micropower False-Ground Generator
Some single supply circuits work best when inputs are biased
above ground, typically at 1/2 of the supply voltage. In these
cases a false ground can be created by using a voltage divider
buffered by an amplifier. One such circuit is shown in Figure 28.
This circuit will generate a false-ground reference at 1/2 of the
supply voltage, while drawing only about 27 µA from a 5 V sup-
ply. The circuit includes compensation to allow for a 1 µF by-
pass capacitor at the false-ground output. The benefit of a large
capacitor is that not only does the false ground present a very
low dc resistance to the load, but its ac impedance is low as well.
The OP193 can both sink and source more than 5 mA, which
improves recovery time from transients in the load current.
+5V OR +12V
10kΩ
240kΩ
240kΩ
0.022µF
7
2
100Ω
OP193 6
+2.5V OR +6V
3
1µF
4
1µF
Figure 28. A Micropower False-Ground Generator
A Battery Powered Voltage Reference
The circuit of Figure 29 is a battery-powered voltage reference
that draws only 17 µA of supply current. At this level, two AA
alkaline cells can power this reference for more than 18 months.
At an output voltage of 1.23 V @ 25°C, drift of the reference is
only 5.5 µV/°C over the industrial temperature range. Load
regulation is 85 µV/mA with line regulation at 120 µV/V.
Design of the reference is based on the Brokaw bandgap core
technique. Scaling of resistors R1 and R2 produces unequal cur-
rents in Q1 and Q2. The resulting ∆VBE across R3 creates a tem-
perature-proportional voltage (PTAT) which, in turn, produces
a larger temperature-proportional voltage across R4 and R5, V1.
The temperature coefficient of V1 cancels (first order) the
complementary to absolute temperature (CTAT) coefficient of
VBE1. When adjusted to 1.23 V @ +25°C, output voltage
tempco is at a minimum. Bandgap references can have start-up
problems. With no current in R1 and R2, the OP193 is beyond
its positive input range limit and has an undefined output state.
Shorting Pin 5 (an offset adjust pin) to ground forces the output
high under these circumstances and insures reliable startup
without significantly degrading the OP193’s offset drift.
R1
240kΩ
C1
1000pF
R2
1.5MΩ
V+
(+2.5V TO +36V)
7
2
OP193
35
4
6
VOUT
(1.23V @ 25°C)
1 MAT-01AH 7 Q1
Q2 2
6
3 VBE2
5 VBE1
V1
R4
130kΩ
R5 20kΩ
OUTPUT
ADJUST
R3 68kΩ
∆VBE
Figure 29. A Battery Powered Voltage Reference
A Single-Supply Current Monitor
Current monitoring essentially consists of amplifying the voltage
drop across a resistor placed in series with the current to be
measured. The difficulty is that only small voltage drops can be
tolerated, and with low precision op amps this greatly limits the
overall resolution. The single-supply current monitor of Figure
30 has a resolution of 10 µA and is capable of monitoring 30
mA of current. This range can be adjusted by changing the cur-
rent sense resistor R1. When measuring total system current, it
may be necessary to include the supply current of the current
monitor, which bypasses the current sense resistor, in the final
result. This current can be measured and calibrated (together
with the residual offset) by adjustment of the offset trim potenti-
ometer, R2. This produces a deliberate temperature dependent
offset. However, the supply current of the OP193 is also propor-
tional to temperature, and the two effects tend to track. Current
in R4 and R5, which also bypasses R1, can be adjusted via a
gain trim.
V+
TO CIRCUIT
UNDER TEST
ITEST
R1
1Ω
7
3
OP193 6
2
4
5
1
R2
100kΩ
VOUT =
100mV/mA(ITEST)
R2
9.9kΩ
R5
100Ω
R3
100kΩ
Figure 30. Single-Supply Current Monitor
REV. A
–11–
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet OP493.PDF ] | |
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