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OP-184 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer OP-184
Beschreibung Precision Rail-to-Rail Input & Output Operational Amplifiers
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 20 Seiten
OP-184 Datasheet, Funktion
a
FEATURES
Single-Supply Operation
Wide Bandwidth: 4 MHz
Low Offset Voltage: 65 V
Unity-Gain Stable
High Slew Rate: 4.0 V/s
Low Noise: 3.9 nV/Hz
APPLICATIONS
Battery Powered Instrumentation
Power Supply Control and Protection
Telecom
DAC Output Amplifier
ADC Input Buffer
Precision Rail-to-Rail Input & Output
Operational Amplifiers
OP184/OP284/OP484
PIN CONFIGURATIONS
8-Lead Epoxy DIP
(P Suffix)
8-Lead SO
(S Suffix)
NULL 1
–IN A 2
+IN A 3
V– 4
OP184
8 NC
7 V+
6 OUT A
5 NULL
NC = NO CONNECT
GENERAL DESCRIPTION
The OP184/OP284/OP484 are single, dual and quad single-
supply, 4 MHz bandwidth amplifiers featuring rail-to-rail inputs
and outputs. They are guaranteed to operate from +3 to +36 (or
± 1.5 to ± 18) volts and will function with a single supply as low
as +1.5 volts.
These amplifiers are superb for single supply applications re-
quiring both ac and precision dc performance. The combination
of bandwidth, low noise and precision makes the OP184/OP284/
OP484 useful in a wide variety of applications, including filters
and instrumentation.
Other applications for these amplifiers include portable telecom
equipment, power supply control and protection, and as amplifi-
ers or buffers for transducers with wide output ranges. Sensors
requiring a rail-to-rail input amplifier include Hall effect, piezo
electric, and resistive transducers.
The ability to swing rail-to-rail at both the input and output en-
ables designers to build multistage filters in single-supply sys-
tems and to maintain high signal-to-noise ratios.
The OP184/OP284/OP484 are specified over the HOT extended
industrial (–40°C to +125°C) temperature range. The single
and dual are available in 8-pin plastic DIP plus SO surface
mount packages. The quad OP484 is available in 14-pin plastic
DIPs and 14-lead narrow-body SO packages.
8-Lead Epoxy DIP
(P Suffix)
8-Lead SO
(S Suffix)
OUT A 1
–IN A 2
+IN A 3
V– 4
OP284 8 V+
7 OUT B
6 –IN B
5 +IN B
14-Lead Epoxy DIP
(P Suffix)
14-Lead Narrow-Body SO
(S Suffix)
OUT A 1
–IN A 2
+IN A 3
V+ 4
+IN B 5
–IN B 6
OUT B 7
OP484
14 OUT D
13 –IN D
12 +IN D
11 V–
10 +IN C
9 –IN C
8 OUT C
REV. 0
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1996






OP-184 Datasheet, Funktion
OP184/OP284/OP484–Typical Performance Characteristics
300
270 VS = +3V
240 TA = +25°C
VCM = 1.5V
210
180
150
120
90
60
30
0
–100 –75 –50 –25 0 25 50 75 100
INPUT OFFSET VOLTAGE – µV
Figure 2. Input Offset Voltage
Distribution
300
250
VS = +5V
–40°C TA +125°C
200
150
100
50
0
0 0.25 0.50 0.75 1.0 1.25 1.5
OFFSET VOLTAGE DRIFT, TCVOS – µV/°C
Figure 5. Input Offset Voltage Drift
Distribution
500
400 VS = ±15V
300
200
100
0
–100
–200
–300
–400
–500
–15 –10
–5
0
5 10
COMMON MODE VOLTAGE – Volts
15
Figure 8. Input Bias Current vs.
Common-Mode Voltage
300
270 VS = +5V
240
TA = +25°C
VCM = 2.5V
210
180
150
120
90
60
30
0
–100 –75 –50 –25 0 25 50 75 100
INPUT OFFSET VOLTAGE – µV
Figure 3. Input Offset Voltage
Distribution
300
250
VS = ±15V
–40°C TA +125°C
200
150
100
50
0
0 0.25 0.50 0.75 1.0 1.25 1.5
OFFSET VOLTAGE DRIFT, TCVOS – µV/°C
Figure 6. Input Offset Voltage Drift
Distribution
1,000
VS = ±15V
100
SOURCE
SINK
10
0.01
0.1 1
LOAD CURRENT – mA
10
Figure 9. Output Voltage to Supply
Rail vs. Load Current
200
175 VS = ±15V
TA = +25°C
150
125
100
75
50
25
0
–125 –100 –75 –50 –25 0 25 50 75 100 125
INPUT OFFSET VOLTAGE – µV
Figure 4. Input Offset Voltage
Distribution
–40
–45
–50
–55
–60
–65
–70
–75
–80
–40
VCM = VS/ 2
VS = +5V
VS = ±15V
25 85
TEMPERATURE – °C
125
Figure 7. Bias Current vs.
Temperature
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
–40
VS = ±15V
VS = +5V
VS = +3V
25 85
TEMPERATURE – °C
125
Figure 10. Supply Current vs.
Temperature
–6– REV. 0

6 Page









OP-184 pdf, datenblatt
OP184/OP284/OP484
Referring to the op amp noise model circuit configuration illus-
trated in Figure 45, the expression for an amplifier’s total
equivalent input noise voltage for a source resistance level RS is
given by:
[ ]enT =
2 (enR)2 + (inOA × R)2 + (enOA)2, units in
V
Hz
where RS = 2R = Effective, or equivalent, circuit source
resistance,
(enOA)2 = Op amp equivalent input noise voltage spectral
power (1 Hz BW),
(inOA)2 = Op amp equivalent input noise current spectral
power (1 Hz BW),
(enR)2 = Source resistance thermal noise voltage power =
(4kTR),
k = Boltzmann’s constant = 1.38 × 10–23 J/K, and
T = Ambient temperature of the circuit, in Kelvin, =
273.15 + TA (°C)
R eNR
"NOISELESS"
e NOA
i NOA
R eNR
"NOISELESS"
i NOA
IDEAL
NOISELESS
OP AMP
RS = 2R
Figure 45. Op Amp Noise Circuit Model Used to
Determine Total Circuit Equivalent Input Noise Voltage
and Noise Figure
As a design aid, Figure 46 illustrates the total equivalent input
noise of the OP284 and the total thermal noise of a resistor for
comparison. Note that for source resistance less than 1 k, the
equivalent input noise voltage of the OP284 is dominant.
100
FREQUENCY = 1kHz
TA = +25°C
OP284 TOTAL
EQUIVALENT NOISE
10
RESISTOR THERMAL
NOISE ONLY
1
100 1k 10k 100k
TOTAL SOURCE RESISTANCE, RS
Figure 46. OP284 Total Noise vs. Source Resistance
Since circuit SNR is the critical parameter in the final analysis,
the noise behavior of a circuit is often expressed in terms of its
noise figure, NF. Noise figure is defined as the ratio of a
circuit’s output signal-to-noise to its input signal-to-noise. An
expression of a circuit’s NF in dB, and in terms of the opera-
tional amplifier’s voltage and current noise parameters defined
previously, is given by:
NF
(dB )
=
10
log
1 +


(enOA)2 + (inOA
(enRS )2
RS
)2


where NF (dB) = Noise figure of the circuit, expressed in dB,
RS = Effective, or equivalent, source resistance presented
to amplifier,
(enOA)2 = OP284 noise voltage spectral power (1 Hz BW),
(inOA)2 = OP284 noise current spectral power (1 Hz BW),
(enRS)2 = Source resistance thermal noise voltage power
= (4kTRS),
Circuit noise figure is straightforward to calculate because the
signal level in the application is not required to determine it.
However, many designers using NF calculations as the basis for
achieving optimum SNR believe that low noise figure is equal to
low total noise. In fact, the opposite is true, as illustrated in
Figure 47. Here, the noise figure of the OP284 is expressed as a
function of the source resistance level. Note that the lowest
noise figure for the OP284 occurs at a source resistance level of
10 k. However, Figure 46 shows that this source resistance
level and the OP284 generate approximately 14 nV/Hz of total
equivalent circuit noise. Signal levels in the application would
invariably be increased to maximize circuit SNR—not an option
in low voltage, single supply applications.
10
9
FREQUENCY = 1kHz
TA = +25°C
8
7
6
5
4
3
2
1
0
100 1k 10k 100k
TOTAL SOURCE RESISTANCE, RS
Figure 47. OP284 Noise Figure vs. Source Resistance
In single supply applications, therefore, it is recommended for
optimum circuit SNR to choose an operational amplifier with
the lowest equivalent input noise voltage and to choose source
resistance levels consistent in maintaining low total circuit noise.
–12–
REV. 0

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