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Dual Bipolar/JFET, Audio
Operational Amplifier
OP275
FEATURES
Excellent Sonic Characteristics
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 Voltage: 1 mV
Low Offset Current: 2 nA
Unity Gain Stable
SOIC-8 Package
PDIP-8 Package
APPLICATIONS
High Performance Audio
Active Filters
Fast Amplifiers
Integrators
GENERAL DESCRIPTION
PIN CONNECTIONS
8-Lead Narrow-Body SOIC
(S Suffix)
OUT A
1
–IN A
2
+IN A
3
V–
4
8
8-Lead PDIP
(P Suffix)
OUT A
–IN A
+IN A
V–
1
2
3
4
V+
OUT B
–IN B
+IN B
OP275
8
7
6
5
OP275
7
6
5
V+
OUT B
–IN B
+IN B
The OP275 is the first amplifier to feature the Butler Amplifier
front end. This new front end design combines both bipolar
and JFET transistors to attain amplifiers with the accuracy and
low noise performance of bipolar transistors, and the speed and
sound quality of JFETs. Total Harmonic Distortion plus Noise
equals that of previous audio amplifiers, but at much lower
supply currents.
A very low l/f corner of below 6 Hz maintains a flat noise density
response. Whether noise is measured at either 30 Hz or 1 kHz,
it is only 6 nV
Hz.
The JFET portion of the input stage gives
the OP275 its high slew rates to keep distortion low, even when
large output swings are required, and the 22 V/µs slew rate of the
OP275 is the fastest of any standard audio amplifier. Best of all,
this low noise and high speed are accomplished using less than
5 mA of supply current, lower than any standard audio amplifier.
Improved dc performance is also provided with bias and offset
currents greatly reduced over purely bipolar designs. Input offset
voltage is guaranteed at 1 mV and is typically less than 200 µV.
This allows the OP275 to be used in many dc-coupled or sum-
ming applications without the need for special selections or the
added noise of additional offset adjustment circuitry.
The output is capable of driving 600
loads to 10 V rms while
maintaining low distortion. THD + Noise at 3 V rms is a low
0.0006%.
The OP275 is specified over the extended industrial (–40°C to
+85°C) temperature range. OP275s are available in both plas-
tic DIP and SOIC-8 packages. SOIC-8 packages are available
in 2500-piece reels. Many audio amplifiers are not offered
in SOIC-8 surface-mount packages for a variety of reasons;
however, the OP275 was designed so that it would offer full
performance in surface-mount packaging.
REV. C
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 oth-
erwise under any patent or patent rights of Analog Devices. Trademarks
and registered trademarks are the property of their respective owners.
One Technology Way, P Box 9106, Norwood, MA 02062-9106, U.S.A.
.O.
www.analog.com
Tel: 781/329-4700
Fax: 781/326-8703
© 2004 Analog Devices, Inc. All rights reserved.
OP275–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
(@ V =
15.0
V, T = 25C, unless otherwise noted.)
S
A
Parameter
AUDIO PERFORMANCE
THD + Noise
Voltage Noise Density
Current Noise Density
Headroom
INPUT CHARACTERISTICS
Offset Voltage
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
Offset Voltage Drift
OUTPUT CHARACTERISTICS
Output Voltage Swing
Symbol
Conditions
V
IN
= 3 V rms,
R
L
= 2 k, f = 1 kHz
f = 30 Hz
f = 1 kHz
f = 1 kHz
THD + Noise
0.01%,
R
L
= 2 k, V
S
= ±18 V
Min
Typ
Max
Unit
e
n
i
n
0.006
7
6
1.5
>12.9
1
1.25
350
400
50
100
+10.5
%
nV
Hz
nV
Hz
pA
Hz
dBu
mV
mV
nA
nA
nA
nA
V
dB
V/mV
V/mV
V/mV
µV/°C
+13.5
+13
V
V
V
dB
dB
V
OS
I
B
I
OS
V
CM
CMRR
A
VO
V
OS
/T
V
O
–40°C
T
A
+85°C
V
CM
= 0 V
V
CM
= 0 V, –40°C
T
A
+85°C
V
CM
= 0 V
V
CM
= 0 V, –40°C
T
A
+85°C
V
CM
= ±10.5 V,
–40°C
T
A
+85°C
R
L
= 2 k
R
L
= 2 k, –40°C
T
A
+85°C
R
L
= 600
–10.5
80
250
175
100
100
2
2
106
200
2
±13.9
±13.9
+14, –16
111
R
L
= 2 k
R
L
= 2 k, –40°C
T
A
+85°C
R
L
= 600
,
V
S
= ±18 V
V
S
= ±4.5 V to ±18 V
V
S
= ±4.5 V to ±18 V,
–40°C
T
A
+85°C
V
S
= ±4.5 V to ±18 V, V
O
= 0 V,
R
L
=
,
–40°C
T
A
+85°C
V
S
= ±22 V, V
O
= 0 V, R
L
=
,
–40°C
T
A
+85°C
–13.5
–13
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current
PSRR
I
SY
85
80
4
±4.5
15
22
9
62
10
5
5.5
±22
mA
mA
V
V/µs
kHz
MHz
Degrees
%
Supply Voltage Range
DYNAMIC PERFORMANCE
Slew Rate
Full-Power Bandwidth
Gain Bandwidth Product
Phase Margin
Overshoot Factor
Specifications subject to change without notice.
V
S
SR
BW
P
GBP
Ø
m
R
L
= 2 k
V
IN
= 100 mV, A
V
= +1,
R
L
= 600
,
C
L
= 100 pF
–2–
REV. C
OP275
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±22 V
Input Voltage
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±22 V
Differential Input Voltage
2
. . . . . . . . . . . . . . . . . . . . . . . ±7.5 V
Output Short-Circuit Duration to GND
3
. . . . . . . . . . Indefinite
Storage Temperature Range
P, S Packages . . . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Operating Temperature Range
OP275G . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
Junction Temperature Range
P, S Packages . . . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature Range (Soldering, 60 sec) . . . . . . . . . .300°C
Package Type
8-Lead Plastic DIP (P)
8-Lead SOIC (S)
JA4
103
158
JC
43
43
Unit
°C/W
°C/W
NOTES
1
Absolute maximum ratings apply to packaged parts, unless otherwise noted.
2
For supply voltages greater than ±22 V, the absolute maximum input voltage is equal
to the supply voltage.
3
Shorts to either supply may destroy the device. See data sheet for full details.
4
JA
is specified for the worst-case conditions, i.e.,
JA
is specified for device in socket
for PDIP packages;
JA
is specified for device soldered in circuit board for SOIC
packages.
ORDERING GUIDE
Model
OP275GP
OP275GS
OP275GS-REEL
OP275GS-REEL7
OP275GSZ*
OP275GSZ-REEL*
OP275GSZ-REEL7*
*Z
= Pb-free part.
Temperature Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package Description
8-Lead PDIP
8-Lead SOIC
8-Lead SOIC
8-Lead SOIC
8-Lead SOIC
8-Lead SOIC
8-Lead SOIC
Package Option
N-8
R-8
R-8
R-8
R-8
R-8
R-8
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily accumulate
on the human body and test equipment and can discharge without detection. Although the OP275 features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
REV. C
–3–
OP275–Typical Performance Characteristics
25
20
OUTPUT VOLTAGE SWING – V
1500
1000
750
500
250
0
–50
+GAIN
R
L
= 600
0
–5
–10
–15
–20
–VOM
–GAIN
R
L
= 2k
GAIN – dB
5
10
0
–10
–20
45
0
–45
–90
–GAIN
R
L
= 600
–30
–40
75
100
10k
100k
1M
10M
–135
–180
–25
0
5
10
15
20
SUPPLY VOLTAGE – V
25
–25
0
25
50
TEMPERATURE –
C
FREQUENCY – Hz
TPC 1. Output Voltage Swing
vs. Supply Voltage
TPC 2. Open-Loop Gain vs.
Temperature
TPC 3. Closed-Loop Gain and
Phase, A
V
= +1
60
60
50
40
GAIN – dB
MARKER 15 309.059Hz
MAG (A/H)
60.115dB
50
CLOSED-LOOP GAIN – dB
V
S
=
15V
T
A
= 25
C
40
30
20
10
0
–10
–20
–30
1k
A
VCL
= +100
V
S
=
15V
T
A
= 25C
50
40
30
20
10
0
100
V
S
=
15V
T
A
= 25C
A
VCL
= +1
A
VCL
= +10
A
VCL
= +100
30
20
10
0
–10
–20
10k
100k
1M
FREQUENCY – Hz
10M
MARKER 15 309.058Hz
PHASE (A/R) 90.606Deg
135
90
45
0
–45
–90
PHASE – Degrees
A
VCL
= +10
A
VCL
= +1
10k
100k
1M
10M
FREQUENCY – Hz
100M
IMPEDANCE –
1k
10k
100k
FREQUENCY – Hz
1M
10M
TPC 4. Open-Loop Gain,
Phase vs. Frequency
TPC 5. Closed-Loop Gain vs.
Frequency
TPC 6. Closed-Loop Output
Impedance vs. Frequency
120
COMMON-MODE REJECTION – dB
120
100
80
OPEN-LOOP GAIN – dB
POWER SUPPLY REJECTION – dB
100
80
60
40
20
0
100
V
S
=
15V
T
A
= 25C
100
80
60
40
20
0
10
V
S
=
15V
T
A
=
25C
–PSRR
+PSRR
GAIN
60
40
20
0
–20
–40
PHASE
V
S
=
15V
R
L
= 2k
T
A
= 25
C
Ø
m
= 58
0
45
90
135
180
225
270
PHASE – Degrees
1k
10k
100k
FREQUENCY – Hz
1M
10M
100
1k
10k
100k
FREQUENCY – Hz
1M
–60
1k
10k
100k
1M
10M
FREQUENCY – Hz
100M
TPC 7. Common-Mode
Rejection vs. Frequency
TPC 8. Power Supply Rejection vs.
Frequency
TPC 9. Open-Loop Gain,
Phase vs. Frequency
–4–
REV. C
PHASE – Degrees
10
+VOM
OPEN-LOOP GAIN – V/mV
15
T
A
= 25C
R
L
= 2k
1250
V
S
=
15V
V
O
=
15V
+GAIN
R
L
= 2k
40
30
20
V
S
=
15V
T
A
= 25
C
180
135
90
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