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PDF OP285 Data sheet ( Hoja de datos )
| Número de pieza | OP285 | |
| Descripción | Dual 9 MHz Precision Operational Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
Dual 9 MHz Precision
Operational Amplifier
OP285*
FEATURES
Low Offset Voltage: 250 V
Low Noise: 6 nV/√ Hz
Low Distortion: 0.0006%
High Slew Rate: 22 V/s
Wide Bandwidth: 9 MHz
Low Supply Current: 5 mA
Low Offset Current: 2 nA
Unity-Gain Stable
SO-8 Package
APPLICATIONS
High Performance Audio
Active Filters
Fast Amplifiers
Integrators
GENERAL DESCRIPTION
The OP285 is a precision high-speed amplifier featuring the
Butler Amplifier front-end. This new front-end design com-
bines the accuracy and low noise performance of bipolar
transistors with the speed of JFETs. This yields an amplifier
with high slew rates, low offset and good noise performance
at low supply currents. Bias currents are also low compared
to bipolar designs.
The OP285 offers the slew rate and low power of a JFET
amplifier combined with the precision, low noise and low
drift of a bipolar amplifier. Input offset voltage is laser-trimmed
and guaranteed less than 250 µV. This makes the OP285 useful
in dc-coupled or summing applications without the need for
special selections or the added noise of additional offset
adjustment circuitry. Slew rates of 22 V/µs and a bandwidth
of 9 MHz make the OP285 one of the most accurate medium
speed amplifiers available.
PIN CONNECTIONS
8-Lead Narrow-Body SO (S-Suffix)
OUT A 1
–IN A 2
+IN A 3
V– 4
TOOPPV2I8E5W
(Not to Scale)
8 V+
7 OUT B
6 –IN B
5 +IN B
8-Lead Epoxy DIP (P-Suffix)
OUT A 1
–IN A 2
+IN A 3
V– 4
–+
+–
OP285
8 V+
7 OUT B
6 –IN B
5 +IN B
The combination of low noise, speed and accuracy can be used
to build high speed instrumentation systems. Circuits such as
instrumentation amplifiers, ramp generators, bi-quad filters and
dc-coupled audio systems are all practical with the OP285. For
applications that require long term stability, the OP285 has a
guaranteed maximum long term drift specification.
The OP285 is specified over the XIND—extended industrial—
(–40°C to +85°C) temperature range. OP285s are available in
8-pin plastic DIP and SOIC-8 surface mount packages.
*Patents pending
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 that
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: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
1 page  
11 65
10 ø M
9
GBW
8
60
55
50
7
–50 –25
0
40
25 50 75 100
TEMPERATURE – ؇C
TPC 10. Gain Bandwidth Product,
Phase Margin vs. Temperature
Typical Performance Characteristics–OP285
100
90
80
70
60
50
40
30
20
10
0
0
AVCL = +1
NEGATIVE EDGE
AVCL= +1
POSITIVE EDGE
VS = 15V
RL = 2k
VIN = 100mV p-p
100 200 300 400
LOAD CAPACITANCE – pF
500
TPC 11. Small-Signal Overshoot vs.|
Load Capacitance
16
14
–VOM
12
10
8
6 +VOM
4 TA = 25؇C
VS = 15V
2
0
100
1k
LOAD RESISTANCE – ⍀
10k
TPC 12. Maximum Output Voltage
vs. Load Resistance
30
25
20
15
10 TA = 25؇C
VS = 15V
AVCL = +1
5 RL = 2k⍀
0
1k 10k 100k 1M 10M
FREQUENCY – Hz
TPC 13. Maximum Output Swing
vs. Frequency
5.0
4.5
TA = +85؇C
4.0 TA = +25؇C
TA = –40؇C
3.5
3.0
0
5 10 15
SUPPLY VOLTAGE – V
TPC 14. Supply Current vs.
Supply Voltage
25
120
110 VS = 15V
100
90 SINK
80
70
60
50
40
SOURCE
30
20
–50 –25 0
25 50 75 100
TEMPERATURE – ؇C
TPC 15. Short Circuit Current vs.
Temperature
300
VS = 15V
250
200
150
100
50
0
–50
–25 0
25 50 75
TEMPERATURE – ؇C
100
TPC 16. Input Bias Current vs.
Temperature
5
VS = 15V
TA = 25؇C
4
3
2
1
10 100 1k 100k
FREQUENCY – Hz
TPC 17. Current Noise Density vs.
Frequency
250
–40؇C TA +85؇C
402 OP AMPS
200
150
100
50
0
0 1 2 3 4 5 6 7 8 9 10
TC VOS – V/ ؇C
TPC 18. tC VOS Distribution
REV. A
–5–
5 Page 
OP285
R1
95.3k⍀
VIN
2
3 A1
C1
2200pF
1
R2
787⍀
C2
2200pF
1
2
A2 3
R3
1.82k⍀
C3
2200pF
R4
1.87k⍀
R5
1.82k⍀
R6
4.12k⍀
5
6 A3
C4
2200pF
7
R7
100k⍀
5
6 A4
7
R9
1k⍀
R8
1k⍀
VOUT
A1, A4 = 1/2 OP285
A2, A3 = 1/2 OP285
Figure 16. A 3-Pole, 40 kHz Low-Pass Filter
A 3-Pole, 40 kHz Low-Pass Filter
The closely matched and uniform ac characteristics of the OP285
make it ideal for use in GIC (Generalized Impedance Converter)
and FDNR (Frequency Dependent Negative Resistor) filter appli-
cations. The circuit in Figure 16 illustrates a linear-phase,
3-pole, 40 kHz low-pass filter using an OP285 as an inductance
simulator (gyrator). The circuit uses one OP285 (A2 and A3)
for the FDNR and one OP285 (Al and A4) as an input buffer
and bias current source for A3. Amplifier A4 is configured in a
gain of 2 to set the pass band magnitude response to 0 dB. The
benefits of this filter topology over classical approaches are
that the op amp used in the FDNR is not in the signal path and
that the filter’s performance is relatively insensitive to compo-
nent variations. Also, the configuration is such that large signal
levels can be handled without overloading any of the filter’s
internal nodes. As shown in Figure 17, the OP285’s symmetric
slew rate and low distortion produce a clean, well-behaved
transient response.
100
90
VOUT
10V p-p
10kHz
Driving Capacitive Loads
The OP285 was designed to drive both resistive loads to 600 Ω
and capacitive loads of over 1000 pF and maintain stability. While
there is a degradation in bandwidth when driving capacitive loads,
the designer need not worry about device stability. The graph in
Figure 18 shows the 0 dB bandwidth of the OP285 with capacitive
loads from 10 pF to 1000 pF.
10
9
8
7
6
5
4
3
2
1
0
0 200 400 600 800 1000
CLOAD – pF
Figure 18. Bandwidth vs. CLOAD
10
0%
SCALE: VERTICAL – 2V/ DIV
HORIZONTAL – 10S/ DIV
Figure 17. Low-Pass Filter Transient Response
REV. A
–11–
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet OP285.PDF ] | |
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