OPA227
OPA
4
OPA
227
OPA
422
7
227
OPA
2
227
OPA2227
OPA4227
O PA
227
O PA
222
7
OPA228
OPA2228
OPA4228
SBOS110A – MAY 1998 – REVISED JANUARY 2005
High Precision, Low Noise
OPERATIONAL AMPLIFIERS
FEATURES
q
LOW NOISE: 3nV/√Hz
q
WIDE BANDWIDTH:
OPA227: 8MHz, 2.3V/
µ
s
OPA228: 33MHz, 10V/
µ
s
q
SETTLING TIME: 5
µ
s
(significant improvement over OP-27)
q
q
q
q
q
q
HIGH CMRR: 138dB
HIGH OPEN-LOOP GAIN: 160dB
LOW INPUT BIAS CURRENT: 10nA max
LOW OFFSET VOLTAGE: 75
µ
V max
WIDE SUPPLY RANGE:
±
2.5V to
±
18V
OPA227 REPLACES OP-27, LT1007, MAX427
DESCRIPTION
The OPA227 and OPA228 series op amps combine low
noise and wide bandwidth with high precision to make them
the ideal choice for applications requiring both ac and preci-
sion dc performance.
The OPA227 is unity-gain stable and features high slew rate
(2.3V/µs) and wide bandwidth (8MHz). The OPA228 is opti-
mized for closed-loop gains of 5 or greater, and offers higher
speed with a slew rate of 10V/µs and a bandwidth of 33MHz.
The OPA227 and OPA228 series op amps are ideal for
professional audio equipment. In addition, low quiescent
current and low cost make them ideal for portable applica-
tions requiring high precision.
The OPA227 and OPA228 series op amps are pin-for-pin
replacements for the industry standard OP-27 and OP-37
with substantial improvements across the board. The dual
and quad versions are available for space savings and per-
channel cost reduction.
The OPA227, OPA228, OPA2227, and OPA2228 are
available in DIP-8 and SO-8 packages. The OPA4227 and
OPA4228 are available in DIP-14 and SO-14 packages
with standard pin configurations. Operation is specified
from –40°C to +85°C.
OPA4227, OPA4228
Out A
–In A
1
2
A
D
12
11
10
B
–In B
6
7
DIP-14, SO-14
C
9
8
–In C
Out C
+In D
V–
+In C
3
4
5
14
13
Out D
–In D
q
OPA228 REPLACES OP-37, LT1037, MAX437
q
SINGLE, DUAL, AND QUAD VERSIONS
APPLICATIONS
q
q
q
q
q
q
q
DATA ACQUISITION
TELECOM EQUIPMENT
GEOPHYSICAL ANALYSIS
VIBRATION ANALYSIS
SPECTRAL ANALYSIS
PROFESSIONAL AUDIO EQUIPMENT
ACTIVE FILTERS
q
POWER SUPPLY CONTROL
SPICE model available for OPA227 at www.ti.com
OPA2227, OPA2228
OPA227, OPA228
+In A
V+
Out A
Trim
–In
+In
V–
1
2
3
4
DIP-8, SO-8
NC = Not Connected
8
7
6
5
Trim
V+
Output
NC
1
2
3
4
DIP-8, SO-8
A
B
8
7
6
5
V+
+In B
–In A
+In A
V–
Out B
–In B
Out B
+In B
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 1998-2005, Texas Instruments Incorporated
www.ti.com
SPECIFICATIONS: V
S
=
±
5V to
±
15V
OPA227 Series
At T
A
= +25°C, and R
L
= 10kΩ, unless otherwise noted.
Boldface
limits apply over the specified temperature range, T
A
= –40°C to +85°C.
OPA227P, U
OPA2227P, U
PARAMETER
OFFSET VOLTAGE
Input Offset Voltage
V
OS
OT
A
= –40
°
C to +85
°
Cver
Temperature
vs Temperature
dV
OS
/dT
vs Power Supply
PSRR
T
A
= –40
°
C to +85
°
C
vs Time
Channel Separation (dual, quad)
INPUT BIAS CURRENT
Input Bias Current
T
A
= –40
°
C to +85
°
C
Input Offset Current
T
A
= –40
°
C to +85
°
C
NOISE
Input Voltage Noise, f = 0.1Hz to 10Hz
Input Voltage Noise Density, f = 10Hz e
n
f = 100Hz
f = 1kHz
Current Noise Density, f = 1kHz
i
n
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection
T
A
= –40
°
C to +85
°
C
INPUT IMPEDANCE
Differential
Common-Mode
OPEN-LOOP GAIN
Open-Loop Voltage Gain
T
A
= –40
°
C to +85
°
C
T
A
= –40
°
C to +85
°
C
FREQUENCY RESPONSE
Gain Bandwidth Product
GBW
Slew Rate
SR
Settling Time: 0.1%
0.01%
Overload Recovery Time
Total Harmonic Distortion + Noise THD+N
OUTPUT
Voltage Output
T
A
= –40
°
C to +85
°
C
T
A
= –40
°
C to +85
°
C
Short-Circuit Current
Capacitive Load Drive
POWER SUPPLY
Specified Voltage Range
Operating Voltage Range
Quiescent Current (per amplifier)
T
A
= –40
°
C to +85
°
C
TEMPERATURE RANGE
Specified Range
Operating Range
Storage Range
Thermal Resistance
SO-8 Surface Mount
DIP-8
DIP-14
SO-14 Surface Mount
✻
Specifications same as OPA227P, U.
A
OL
V
CM
CMRR
(V–)+2
120
120
CONDITION
MIN
TYP
±5
V
S
=
±2.5V
to
±18V
MAX
±75
±2
±
2
OPA227PA, UA
OPA2227PA, UA
OPA4227PA, UA
MIN
TYP
±10
MAX
±200
UNITS
µV
µV
µV/°C
µV/V
µV/V
µV/mo
µV/V
dB
nA
nA
nA
nA
nVp-p
nVrms
nV/√Hz
nV/√Hz
nV/√Hz
pA/√Hz
✻
✻
V
dB
dB
Ω
|| pF
Ω
|| pF
dB
dB
dB
dB
MHz
V/µs
µs
µs
µs
%
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
V
V
V
V
mA
±
0.1
0.2
0.2
110
±0.5
±
100
±
0.6
±
0.3
✻
✻
✻
✻
±
200
±
2
✻
✻
dc
f = 1kHz, R
L
= 5kΩ
I
B
I
OS
±2.5
±2.5
±
10
±
10
±10
±10
✻
✻
✻
✻
✻
✻
90
15
3.5
3
3
0.4
(V+)–2
138
✻
✻
✻
✻
✻
✻
✻
✻
✻
V
CM
= (V–)+2V to (V+)–2V
V
CM
= (V–)+2V to (V+)–2V
V
O
= (V–)+2V to (V+)–2V, R
L
= 10kΩ
V
O
= (V–)+3.5V to (V+)–3.5V, R
L
= 600Ω
132
132
132
132
10
7
|| 12
10
9
|| 3
160
160
✻
✻
✻
✻
✻
✻
✻
✻
G = 1, 10V Step, C
L
= 100pF
G = 1, 10V Step, C
L
= 100pF
V
IN
• G = V
S
f = 1kHz, G = 1, V
O
= 3.5Vrms
R
L
=
R
L
=
R
L
=
R
L
=
10kΩ
10kΩ
600Ω
600Ω
(V–)+2
(V–)+2
(V–)+3.5
(V–)+3.5
8
2.3
5
5.6
1.3
0.00005
(V+)–2
(V+)–2
(V+)–3.5
(V+)–3.5
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
I
SC
C
LOAD
V
S
I
Q
I
O
= 0
I
O
= 0
±45
See Typical Curve
±5
±2.5
±15
±18
±3.8
±
4.2
+85
+125
+150
150
100
80
100
±3.7
V
V
mA
mA
°C
°C
°C
°C/W
°C/W
°C/W
°C/W
θ
JA
–40
–55
–65
✻
✻
✻
2
OPA227, 2227, 4227
OPA228, 2228, 4228
www.ti.com
SBOS110A
SPECIFICATIONS: V
S
=
±
5V to
±
15V
OPA228 Series
At T
A
= +25°C, and R
L
= 10kΩ, unless otherwise noted.
Boldface
limits apply over the specified temperature range, T
A
= –40°C to +85°C.
OPA228P, U
OPA2228P, U
PARAMETER
OFFSET VOLTAGE
Input Offset Voltage
V
OS
OT
A
= –40
°
C to +85
°
Cver
Temperature
vs Temperature
dV
OS
/dT
vs Power Supply
PSRR
T
A
= –40
°
C to +85
°
C
vs Time
Channel Separation (dual, quad)
INPUT BIAS CURRENT
Input Bias Current
T
A
= –40
°
C to +85
°
C
Input Offset Current
T
A
= –40
°
C to +85
°
C
NOISE
Input Voltage Noise, f = 0.1Hz to 10Hz
Input Voltage Noise Density, f = 10Hz e
n
f = 100Hz
f = 1kHz
Current Noise Density, f = 1kHz
i
n
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection
T
A
= –40
°
C to +85
°
C
INPUT IMPEDANCE
Differential
Common-Mode
OPEN-LOOP GAIN
Open-Loop Voltage Gain
T
A
= –40
°
C to +85
°
C
T
A
= –40
°
C to +85
°
C
FREQUENCY RESPONSE
Minimum Closed-Loop Gain
Gain Bandwidth Product
GBW
Slew Rate
SR
Settling Time: 0.1%
0.01%
Overload Recovery Time
Total Harmonic Distortion + Noise THD+N
OUTPUT
Voltage Output
T
A
= –40
°
C to +85
°
C
T
A
= –40
°
C to +85
°
C
Short-Circuit Current
Capacitive Load Drive
POWER SUPPLY
Specified Voltage Range
Operating Voltage Range
Quiescent Current (per amplifier)
T
A
= –40
°
C to +85
°
C
TEMPERATURE RANGE
Specified Range
Operating Range
Storage Range
Thermal Resistance
SO-8 Surface Mount
DIP-8
DIP-14
SO-14 Surface Mount
✻
Specifications same as OPA228P, U.
A
OL
V
CM
CMRR
(V–)+2
120
120
CONDITION
MIN
TYP
±5
V
S
=
±2.5V
to
±18V
MAX
±75
±2
±
2
OPA228PA, UA
OPA2228PA, UA
OPA4228PA, UA
MIN
TYP
±10
MAX
±200
UNITS
µV
µV
µV/°C
µV/V
µV/V
µV/mo
µV/V
dB
nA
nA
nA
nA
nVp-p
nVrms
nV/√Hz
nV/√Hz
nV/√Hz
pA/√Hz
✻
✻
V
dB
dB
Ω
|| pF
Ω
|| pF
dB
dB
dB
dB
V/V
MHz
V/µs
µs
µs
µs
%
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
V
V
V
V
mA
±
0.1
0.2
0.2
110
±0.5
±
100
±
0.6
±
0.3
✻
✻
✻
✻
±
200
±
2
✻
✻
dc
f = 1kHz, R
L
= 5kΩ
I
B
I
OS
±2.5
±2.5
±
10
±
10
±10
±10
✻
✻
✻
✻
✻
✻
90
15
3.5
3
3
0.4
(V+)–2
138
✻
✻
✻
✻
✻
✻
✻
✻
✻
V
CM
= (V–)+2V to (V+)–2V
V
CM
= (V–)+2V to (V+)–2V
V
O
= (V–)+2V to (V+)–2V, R
L
= 10kΩ
V
O
= (V–)+3.5V to (V+)–3.5V, R
L
= 600Ω
132
132
132
132
10
7
|| 12
10
9
|| 3
160
160
✻
✻
✻
✻
✻
✻
✻
✻
G = 5, 10V Step, C
L
= 100pF, C
F
=12pF
G = 5, 10V Step, C
L
= 100pF, C
F
=12pF
V
IN
• G = V
S
f = 1kHz, G = 5, V
O
= 3.5Vrms
R
L
=
R
L
=
R
L
=
R
L
=
10kΩ
10kΩ
600Ω
600Ω
(V–)+2
(V–)+2
(V–)+3.5
(V–)+3.5
5
33
11
1.5
2
0.6
0.00005
(V+)–2
(V+)–2
(V+)–3.5
(V+)–3.5
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
I
SC
C
LOAD
V
S
I
Q
I
O
= 0
I
O
= 0
±45
See Typical Curve
±5
±2.5
±15
±18
±3.8
±
4.2
+85
+125
+150
150
100
80
100
±3.7
V
V
mA
mA
°C
°C
°C
°C/W
°C/W
°C/W
°C/W
θ
JA
–40
–55
–65
✻
✻
✻
OPA227, 2227, 4227
OPA228, 2228, 4228
SBOS110A
www.ti.com
3
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage ..................................................................................
±18V
Signal Input Terminals, Voltage ........................ (V–) –0.7V to (V+) +0.7V
Current ....................................................... 20mA
(2)
.............................................................. Continuous
Output Short-Circuit
Operating Temperature .................................................. –55°C to +125°C
Storage Temperature ..................................................... –65°C to +150°C
Junction Temperature ...................................................................... 150°C
Lead Temperature (soldering, 10s) ................................................. 300°C
NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability. (2) Short-circuit to ground, one amplifier per package.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may be
more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
PACKAGE/ORDERING INFORMATION
For the most current package and ordering information, see
the Package Option Addendum located at the end of this
datasheet, or refer to our web site at www.ti.com.
4
OPA227, 2227, 4227
OPA228, 2228, 4228
www.ti.com
SBOS110A
TYPICAL PERFORMANCE CURVES
At T
A
= +25°C, R
L
= 10kΩ, and V
S
=
±15V,
unless otherwise noted.
OPEN-LOOP GAIN/PHASE vs FREQUENCY
180
160
140
120
A
OL
(dB)
OPEN-LOOP GAIN/PHASE vs FREQUENCY
0
180
160
140
120
Phase (°)
A
OL
(dB)
0
OPA227
G
–20
–40
–60
–80
OPA228
–20
–40
G
–60
Phase (°)
100
80
60
40
20
0
–20
0.01 0.10
1
10
100
1k
φ
100
80
60
40
20
0
–20
0.01 0.10
1
10
100
1k
–80
–100
–120
–140
–160
–180
–200
10k 100k 1M 10M 100M
φ
–100
–120
–140
–160
–180
–200
10k 100k 1M 10M 100M
Frequency (Hz)
Frequency (Hz)
POWER SUPPLY AND COMMON-MODE
REJECTION RATIO vs FREQUENCY
140
120
INPUT VOLTAGE AND CURRENT NOISE
SPECTRAL DENSITY vs FREQUENCY
100k
PSRR, CMRR (dB)
100
80
60
40
-20
–0
0.1
1
10
100
1k
10k
100k
1M
Frequency (Hz)
+PSRR
–PSRR
Voltage Noise (nV/√Hz)
Current Noise (fA/√Hz)
+CMRR
10k
Current Noise
1k
100
10
Voltage Noise
1
0.1
1
10
100
1k
10k
Frequency (Hz)
TOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY
0.01
V
OUT
= 3.5Vrms
0.01
TOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY
V
OUT
= 3.5Vrms
OPA227
OPA228
THD+Noise (%)
0.001
THD+Noise (%)
0.001
0.0001
G = 1, R
L
= 10kΩ
0.0001
G = 1, R
L
= 10kΩ
0.00001
20
100
1k
Frequency (Hz)
10k
20k
0.00001
20
100
1k
Frequency (Hz)
10k
50k
OPA227, 2227, 4227
OPA228, 2228, 4228
SBOS110A
www.ti.com
5
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