OPA2251PA [BB]
Single-Supply, MicroPOWER OPERATIONAL AMPLIFIERS; 单电源，微功耗运算放大器
| 型号： | OPA2251PA |
| 厂家： | 
BURR-BROWN CORPORATION |
| 描述： | Single-Supply, MicroPOWER OPERATIONAL AMPLIFIERS |
| 文件： | 总10页 (文件大小：271K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
OPA241
OPA2241
OPA4241
OPA241
OPA4251
OPA4241
OPA251
OPA2251
OPA4251
OPA2251
Single-Supply, MicroPOWER
OPERATIONAL AMPLIFIERS
DESCRIPTION
OPA241 Family optimized for +5V supply.
OPA251 Family optimized for ±15V supply.
The OPA241 series and OPA251 series are specifically
designed for battery powered, portable applications. In addi-
tion to very low power consumption (25µA), these amplifi-
ers feature low offset voltage, rail-to-rail output swing, high
common-mode rejection, and high open-loop gain.
FEATURES
● MicroPOWER: IQ = 25µA
● SINGLE-SUPPLY OPERATION
● RAIL-TO-RAIL OUTPUT (within 50mV)
● WIDE SUPPLY RANGE
Single Supply: +2.7V to +36V
Dual Supply: ±1.35V to ±18V
The OPA241 series is optimized for operation at low power
supply voltage while the OPA251 series is optimized for
high power supplies. Both can operate from either single
(+2.7V to +36V) or dual supplies (±1.35V to ±18V). The
input common-mode voltage range extends 200mV below
the negative supply—ideal for single-supply applications.
They are unity-gain stable and can drive large capacitive
loads. Special design considerations assure that these prod-
ucts are easy to use. High performance is maintained as the
amplifiers swing to their specified limits. Because the initial
offset voltage (±250µV max) is so low, user adjustment is
usually not required. However, external trim pins are pro-
vided for special applications (single versions only).
● LOW OFFSET VOLTAGE: ±250µV max
● HIGH COMMON-MODE REJECTION: 124dB
● HIGH OPEN-LOOP GAIN: 128dB
● SINGLE, DUAL, AND QUAD
APPLICATIONS
● BATTERY OPERATED INSTRUMENTS
● PORTABLE DEVICES
● MEDICAL INSTRUMENTS
● TEST EQUIPMENT
The OPA241 and OPA251 (single versions) are available
in standard 8-pin DIP and SO-8 surface-mount packages.
The OPA2241 and OPA2251 (dual versions) come in 8-pin
DIP and SO-8 surface-mount packages. The OPA4241 and
OPA4251 (quad versions) are available in 14-pin DIP and
SO-14 surface-mount packages. All are fully specified
from –40°C to +85°C and operate from –55°C to +125°C.
OPA4241, OPA4251
OPA241, OPA251
OPA2241, OPA2251
Out A
–In A
+In A
V+
1
2
3
4
5
6
7
14 Out D
13 –In D
12 +In D
11 V–
Offset Trim
1
2
3
4
8
7
6
5
NC
Out A
–In A
+In A
V–
1
2
3
4
8
7
6
5
V+
A
–In
+In
V–
V+
Out B
–In B
+In B
A
B
D
C
B
Output
Offset Trim
+In B
–In B
Out B
10 +In C
8-Pin DIP, SO-8
8-Pin DIP, SO-8
9
8
–In C
Out C
14-Pin DIP, SO-14
International Airport Industrial Park
•
Mailing Address: PO Box 11400, Tucson, AZ 85734
•
Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706
•
Tel: (520) 746-1111
• Twx: 910-952-1111
Internet: http://www.burr-brown.com/
•
FAXLine: (800) 548-6133 (US/Canada Only)
•
Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1997 Burr-Brown Corporation
Printed in U.S.A. October, 1998
PDS-1406B
SPECIFICATIONS: VS = 2.7V to 5V
At TA = +25°C, RL = 100kΩ connected to VS/2, unless otherwise noted.
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C.
OPA241UA, PA
OPA2241UA, PA
OPA4241UA, PA
OPA251UA, PA
OPA2251UA, PA
OPA4251UA, PA
PARAMETER
CONDITION
MIN
TYP(1)
MAX
MIN
TYP(1)
MAX
UNITS
OFFSET VOLTAGE
Input Offset Voltage
VOS
±50
±100
±0.4
3
±250
±400
±100
±130
±0.6
✻
µV
µV
µV/°C
µV/V
µV/V
µV/V
T
A = –40°C to +85°C
vs Temperature
vs Power Supply
dVOS/dT
PSRR
TA = –40°C to +85°C
VS = 2.7V to 36V
VS = 2.7V to 36V
30
30
✻
✻
T
A = –40°C to +85°C
Channel Separation (dual, quad)
0.3
✻
INPUT BIAS CURRENT
Input Bias Current(2)
IB
–4
–20
–25
±2
✻
✻
nA
nA
nA
nA
T
A = –40°C to +85°C
Input Offset Current
A = –40°C to +85°C
IOS
±0.1
T
±2
NOISE
Input Voltage Noise, f = 0.1Hz to 10Hz
Input Voltage Noise Density, f = 1kHz
Current Noise Density, f = 1kHz
1
45
40
✻
✻
✻
µVp-p
nV/√Hz
fA/√Hz
en
in
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
VCM
CMRR
–0.2
80
80
(V+) –0.8
V
dB
dB
Common-Mode Rejection Ratio
A = –40°C to +85°C
V
CM = –0.2V to (V+) –0.8V
VCM = 0V to (V+) –0.8V
106
✻
T
INPUT IMPEDANCE
Differential
Common-Mode
107 || 2
109 || 4
✻
✻
Ω || pF
Ω || pF
OPEN-LOOP GAIN
Open-Loop Voltage Gain
AOL RL = 100kΩ, VO = (V–)+100mV to (V+)–100mV
RL = 100kΩ, VO = (V–)+100mV to (V+)–100mV
RL = 10kΩ, VO = (V–)+200mV to (V+)–200mV
RL = 10kΩ, VO = (V–)+200mV to (V+)–200mV
100
100
100
100
120
120
✻
✻
dB
dB
dB
dB
T
T
A = –40°C to +85°C
A = –40°C to +85°C
FREQUENCY RESPONSE
Gain-Bandwidth Product
Slew Rate
GBW
SR
35
0.01
60
✻
✻
✻
kHz
V/µs
µs
VS = 5V, G = 1
VIN • G = VS
Overload Recovery Time
OUTPUT
Voltage Output Swing from Rail(3)
VO
RL = 100kΩ to VS/2, AOL ≥ 70dB
RL = 100kΩ to VS/2, AOL ≥ 100dB
RL = 100kΩ to VS/2, AOL ≥ 100dB
RL = 10kΩ to VS/2, AOL ≥ 100dB
RL = 10kΩ to VS/2, AOL ≥ 100dB
50
75
✻
✻
mV
mV
mV
mV
mV
100
100
200
200
T
T
A = –40°C to +85°C
A = –40°C to +85°C
100
✻
Short-Circuit Current
Single Versions
Dual, Quad Versions
Capacitive Load Drive
ISC
–24/+4
–30/+4
See Typical Curve
✻
✻
✻
mA
mA
CLOAD
POWER SUPPLY
Specified Voltage Range
Operating Voltage Range
Quiescent Current (per amplifier)
VS
IQ
+2.7 to +5
✻
✻
V
V
µA
µA
T
A = –40°C to +85°C
+2.7
+36
±30
±36
✻
✻
IO = 0
IO = 0
±25
T
A = –40°C to +85°C
TEMPERATURE RANGE
Specified Range
Operating Range
Storage Range
–40
–55
–55
+85
+125
+125
✻
✻
✻
✻
✻
✻
°C
°C
°C
Thermal Resistance
8-Pin DIP
SO-8 Surface Mount
14-Pin DIP
θJA
100
150
80
✻
✻
✻
✻
°C/W
°C/W
°C/W
°C/W
SO-14 Surface Mount
100
✻ Specifications the same as OPA241UA, PA.
NOTES: (1) VS = +5V. (2) The negative sign indicates input bias current flows out of the input terminals. (3) Output voltage swings are measured between the
output and power supply rails.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
®
OPA241, 2241, 4241
2
OPA251, 2251, 4251
SPECIFICATIONS: VS = ±15V
At TA = +25°C, RL = 100kΩ connected to ground, unless otherwise noted.
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C.
OPA241UA, PA
OPA2241UA, PA
OPA4241UA, PA
OPA251UA, PA
OPA2251UA, PA
OPA4251UA, PA
PARAMETER
CONDITION
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
OFFSET VOLTAGE
Input Offset Voltage
VOS
±100
±150
±0.6
✻
±50
±100
±0.5
3
±250
±300
µV
µV
µV/°C
µV/V
µV/V
µV/V
T
A = –40°C to +85°C
vs Temperature
vs Power Supply
dVOS/dT
PSRR
TA = –40°C to +85°C
VS = ±1.35V to ±18V
VS = ±1.35V to ±18V
✻
✻
30
30
T
A = –40°C to +85°C
Channel Separation (dual, quad)
✻
0.3
INPUT BIAS CURRENT
Input Bias Current(1)
IB
✻
✻
–4
–20
–25
±2
nA
nA
nA
nA
T
A = –40°C to +85°C
Input Offset Current
A = –40°C to +85°C
IOS
±0.1
T
±2
NOISE
Input Voltage Noise, f = 0.1Hz to 10Hz
Input Voltage Noise Density, f = 1kHz
Current Noise Density, f = 1kHz
✻
✻
✻
1
45
40
µVp-p
nV/√Hz
fA/√Hz
en
in
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
VCM
CMRR
(V–) –0.2
100
100
(V+) –0.8
V
dB
dB
Common-Mode Rejection Ratio
A = –40°C to +85°C
V
CM = –15.2V to 14.2V
✻
124
T
VCM –15V to 14.2V
=
INPUT IMPEDANCE
Differential
Common-Mode
✻
✻
107 || 2
109 || 4
Ω || pF
Ω || pF
OPEN-LOOP GAIN
Open-Loop Voltage Gain
AOL RL = 100kΩ, VO = –14.75V to +14.75V
RL = 100kΩ, VO = –14.75V to +14.75V
RL = 20kΩ, VO = –14.7V to +14.7V
RL = 20kΩ, VO = –14.7V to +14.7V
✻
✻
100
100
100
100
128
128
dB
dB
dB
dB
T
A = –40°C to +85°C
T
A = –40°C to +85°C
FREQUENCY RESPONSE
Gain-Bandwidth Product
Slew Rate
GBW
SR
✻
✻
✻
35
0.01
60
kHz
V/µs
µs
G = 1
VIN • G = VS
Overload Recovery Time
OUTPUT
Voltage Output Swing from Rail(2)
VO
RL = 100kΩ, AOL ≥ 70dB
RL = 100kΩ, AOL ≥ 100dB
RL = 100kΩ, AOL ≥ 100dB
RL = 20kΩ, AOL ≥ 100dB
RL = 20kΩ, AOL ≥ 100dB
✻
✻
50
75
mV
mV
mV
mV
mV
250
250
300
300
T
T
A = –40°C to +85°C
A = –40°C to +85°C
✻
100
Short-Circuit Current
Single Versions
Dual Versions
ISC
✻
✻
✻
–21/+4
–50/+4
See Typical Curve
mA
mA
Capacitive Load Drive
CLOAD
POWER SUPPLY
Specified Voltage Range
Operating Voltage Range
Quiescent Current (per amplifier)
VS
IQ
✻
✻
±15
V
V
µA
µA
T
A = –40°C to +85°C
✻
✻
±1.35
±18
±38
±45
IO = 0
IO = 0
±27
T
A = –40°C to +85°C
TEMPERATURE RANGE
Specified Range
Operating Range
Storage Range
✻
✻
✻
✻
✻
✻
–40
–55
–55
+85
+125
+125
°C
°C
°C
Thermal Resistance
8-Pin DIP
SO-8 Surface Mount
14-Pin DIP
θJA
✻
✻
✻
✻
100
150
80
°C/W
°C/W
°C/W
°C/W
SO-14 Surface Mount
100
✻ Specifications the same as OPA251UA, PA.
NOTES: (1) The negative sign indicates input bias current flows out of the input terminals. (2) Output voltage swings are measured between the output and
power supply rails.
®
OPA241, 2241, 4241
3
OPA251, 2251, 4251
ABSOLUTE MAXIMUM RATINGS(1)
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
Supply Voltage, V+ to V– .................................................................... 36V
Input Voltage(2) ..................................................(V–) –0.5V to (V+) +0.5V
Output Short Circuit to Ground(3) ............................................ Continuous
Operating Temperature ..................................................–55°C to +125°C
Storage Temperature .....................................................–55°C to +125°C
Junction Temperature ...................................................................... 150°C
Lead Temperature (soldering, 10s) ................................................. 300°C
NOTES: (1) Stresses above these ratings may cause permanent damage.
(2) Input terminals are diode-clamped to the power supply rails. Input signals
that can swing more that 0.5V beyond the supply rails should be current-
limited to 5mA or less. (3) One amplifier per package.
ESD damage can range from subtle performance degrada-
tion 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
OPERATING
VOLTAGE
RANGE
PACKAGE
DRAWING
NUMBER(1)
SPECIFICATION
TEMPERATURE
RANGE
SPECIFIED
VOLTAGE
PRODUCT
PACKAGE
OPA241 SERIES
Single
OPA241PA
OPA241UA
2.7V to 5V
2.7V to 5V
2.7V to 36V
2.7V to 36V
8-Pin DIP
SO-8 Surface Mount
006
182
–40°C to +85°C
–40°C to +85°C
Dual
OPA2241PA
OPA2241UA
2.7V to 5V
2.7V to 5V
2.7V to 36V
2.7V to 36V
8-Pin DIP
SO-8 Surface Mount
006
182
–40°C to +85°C
–40°C to +85°C
Quad
OPA4241PA
OPA4241UA
2.7V to 5V
2.7V to 5V
2.7V to 36V
2.7V to 36V
14-Pin DIP
SO-14 Surface Mount
010
235
–40°C to +85°C
–40°C to +85°C
OPA251 SERIES
Single
OPA251PA
OPA251UA
±15V
±15V
2.7V to 36V
2.7V to 36V
8-Pin DIP
SO-8 Surface Mount
006
182
–40°C to +85°C
–40°C to +85°C
Dual
OPA2251PA
OPA2251UA
±15V
±15V
2.7V to 36V
2.7V to 36V
8-Pin DIP
SO-8 Surface Mount
006
182
–40°C to +85°C
–40°C to +85°C
Quad
OPA4251PA
OPA4251UA
±15V
±15V
2.7V to 36V
2.7V to 36V
14-Pin DIP
SO-14 Surface Mount
010
235
–40°C to +85°C
–40°C to +85°C
NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book.
®
OPA241, 2241, 4241
4
OPA251, 2251, 4251
TYPICAL PERFORMANCE CURVES
At TA = +25°C, and RL = 100kΩ connected to VS/2 (ground for VS = ±15V), unless otherwise noted.
Curves apply to OPA241 and OPA251 unless specified.
POWER SUPPLY and COMMON-MODE
REJECTION RATIO vs FREQUENCY
OPEN-LOOP GAIN/PHASE vs FREQUENCY
160
140
120
100
80
180
160
140
120
100
80
140
120
100
80
VS = ±15V
VS = ±5V
CMRR
G
+PSRR
Φ
60
60
–PSRR
40
60
40
20
40
VS = ±15V
20
VS = +5V
0
20
–20
0
0
0.01
0.1
1
10
100
1k
10k
100k
0.1
1
10
100
1k
10k
100k
Frequency (Hz)
Frequency (Hz)
INPUT VOLTAGE AND CURRENT
CHANNEL SEPARATION vs FREQUENCY
NOISE SPECTRAL DENSITY vs FREQUENCY
140
130
120
110
100
90
1k
100
10
1k
Current Noise
100
Dual and quad devices.
G = 1, all channels.
Quad measured channel
A to D or B to C—other
combinations yield improved
rejection.
Voltage Noise
80
70
10
10
100
1k
10k
100k
0.1
1
10
100
1k
10k
Frequency (Hz)
Frequency (Hz)
QUIESCENT CURRENT vs SUPPLY VOLTAGE
Per Amplifier
QUIESCENT CURRENT vs TEMPERATURE
Per Amplifier
30
28
26
24
22
40
35
30
25
20
15
VS = ±15V
VS = +5V
0
5
10
15
20
25
30
35
40
–75
–50
–25
0
25
50
75
100
125
Total Supply Voltage (V)
Temperature (°C)
®
OPA241, 2241, 4241
OPA251, 2251, 4251
5
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, and RL = 100kΩ connected to VS/2 (ground for VS = ±15V), unless otherwise noted.
Curves apply to OPA241 and OPA251 unless specified.
INPUT BIAS CURRENT
vs INPUT COMMON-MODE VOLTAGE
INPUT BIAS CURRENT vs TEMPERATURE
–5
–4
–3
–2
–1
0
–6
–4
–2
0
IB
IB
IOS
IOS
2
0
5
10
15
20
25
30
–75
–50
–25
0
25
50
75
100
125
Common-Mode Voltage (V)
Temperature (°C)
COMMON-MODE REJECTION vs TEMPERATURE
SHORT-CIRCUIT CURRENT vs TEMPERATURE
50
45
40
35
30
25
20
15
10
5
140
120
100
80
VS = ±15V
VS = ±15V
VS = +2.7V, +5V
–ISC
VS = +5V
VS = +5V
60
Single Versions
Dual, Quad Versions
40
VCM = (V–) –0.2V to (V+) –0.8V
VCM = (V–) –0.1V to (V+) –0.8V
VS = ±15V
20
+ISC, VS = +5V, ±15V (all versions)
V
CM = (V–) to (V+) –0.8V
0
0
–75
–50
–25
0
25
50
75
100
125
–75
–50
–25
0
25
50
75
100
125
Temperature (°C)
Temperature (°C)
OPEN-LOOP GAIN AND POWER
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
T = +25°C
SUPPLY REJECTION vs TEMPERATURE
(V+)
(V+) –0.1V
(V+) –0.2V
140
130
120
110
100
RL = 20kΩ, 100kΩ
T = –55°C
T = +125°C
RL = 100kΩ
(V+) –0.3V
(V–) +0.3V
T = +125°C
RL = 10kΩ
(V–) +0.2V
(V–) +0.1V
(V–)
AOL, VS = ±15V
OL, VS = +5V
T = +25°C, –55°C
PSRR
75
A
0.1
±1
±10
–75
–50
–25
0
25
50
100
125
Output Current (mA)
Temperature (°C)
®
OPA241, 2241, 4241
OPA251, 2251, 4251
6
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, and RL = 100kΩ connected to VS/2 (ground for VS = ±15V), unless otherwise noted.
Curves apply to OPA241 and OPA251 unless specified.
OPEN-LOOP GAIN vs OUTPUT VOLTAGE SWING
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
Maximum output
140
130
120
110
100
90
30
25
20
15
10
5
RL = 20kΩ
VS = ±15V
VS = +5V
voltage without
slew rate-induced
distortion.
VS = ±15V
RL = 100kΩ
VS = +2.7V
RL = 10kΩ
VS = +5V
VS = 2.7V
80
0
10
100
1k
10k
100k
500
400
300
200
100
0
Frequency (Hz)
Output Voltage Swing from Rail (mV)
OPA241 SERIES OFFSET VOLTAGE
PRODUCTION DISTRIBUTION
OPA241 SERIES OFFSET VOLTAGE DRIFT
PRODUCTION DISTRIBUTION
30
25
20
15
10
5
20
18
16
14
12
10
8
VS = +5V
Typical production
distribution of
packaged units.
Singles, duals,
and quads included.
Typical production distribution
of packaged units. Singles,
duals, and quads included.
VS = +5V
6
4
2
0
0
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3
Offset Voltage (µV/°C)
Offset Voltage (µV)
OPA251 SERIES OFFSET VOLTAGE
PRODUCTION DISTRIBUTION
OPA251 SERIES OFFSET VOLTAGE DRIFT
PRODUCTION DISTRIBUTION
30
25
20
15
10
5
18
16
14
12
10
8
V
S = ±15V
Typical production distribution
of packaged units. Singles,
duals, and quads included.
Typical production
distribution of
packaged units.
Singles, duals,
and quads included.
VS = ±15V
6
4
2
0
0
Offset Voltage (µV)
Offset Voltage Drift (µV/°C)
®
OPA241, 2241, 4241
OPA251, 2251, 4251
7
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, and RL = 100kΩ connected to VS/2 (ground for VS ±15V), unless otherwise noted.
Curves apply to OPA241 and OPA251 unless specified.
QUIESCENT CURRENT
QUIESCENT CURRENT
PRODUCT DISTRIBUTION
PRODUCTION DISTRIBUTION
25
20
15
10
5
35
30
25
20
15
10
5
VS = +5V
Typical production
distribution of
packaged units.
Singles, duals,
Typical production distribution
of packaged units. Singles,
duals, and quads included.
VS = ±15V
Per Amplifier
and quads included.
Per Amplifier
0
0
Quiescent Current (µA)
Quiescent Current (µA)
OPA241
OPA241
SMALL-SIGNAL STEP RESPONSE
LARGE-SIGNAL STEP RESPONSE
VS = +5V, G = +1, RL = 100kΩ, CL = 100pF
VS = +5V, G + 1, RL = 100kΩ, CL = 100pF
200µs/div
200µs/div
OPA251
OPA251
SMALL-SIGNAL STEP RESPONSE
VS = ±15V, G = +1, RL = 100kΩ, CL = 500pF
LARGE-SIGNAL STEP RESPONSE
VS = ±15V, G = +1, RL = 100kΩ, CL = 500pF
2ms/div
200µs/div
®
OPA241, 2241, 4241
8
OPA251, 2251, 4251
Figures 2 and 3 show the regions where the OPA241 series
and OPA251 series have the potential for instability. As
shown, the unity gain configuration with low supplies is the
most susceptible to the effects of capacitive load. With VS =
+5V, G = +1, and IOUT = 0, operation remains stable with
load capacitance up to approximately 200pF. Increasing
supply voltage, output current, and/or gain significantly
improves capacitive load drive. For example, increasing the
supplies to ±15V and gain to 10 allows approximately
2700pF to be driven.
APPLICATIONS INFORMATION
The OPA241 and OPA251 series are unity-gain stable and
suitable for a wide range of general purpose applications.
Power supply pins should be bypassed with 0.01µF ceramic
capacitors.
OPERATING VOLTAGE
The OPA241 series is laser-trimmed for low offset voltage
and drift at low supply voltage (VS = +5V). The OPA251
series is trimmed for ±15V operation. Both products operate
over the full voltage range (+2.7V to +36V or ±1.35V to
±18V) with some compromises in offset voltage and drift
performance. However, all other parameters have similar
performance. Key parameters are guaranteed over the speci-
fied temperature range, –40°C to +85°C. Most behavior
remains unchanged throughout the full operating voltage
range. Parameters which vary significantly with operating
voltage or temperature are shown in typical performance
curves.
One method of improving capacitive load drive in the unity
gain configuration is to insert a resistor inside the feedback
loop as shown in Figure 4. This reduces ringing with large
capacitive loads while maintaining dc accuracy. For ex-
ample, with VS = ±1.35V and RS = 5kΩ, the OPA241 series
and OPA251 series perform well with capacitive loads in
excess of 1000pF. Without the series resistor, capacitive
load drive is typically 200pF for these conditions. However,
this method will result in a slight reduction of output voltage
swing.
OFFSET VOLTAGE TRIM
100k
VS = +2.7V
VS = +5V
Operation above
selected gain curve
not recommended
As mentioned previously, offset voltage of the OPA241
series is laser-trimmed at +5V. The OPA251 series is trimmed
at ±15V. Because the initial offset is so low, user adjustment
is usually not required. However, the OPA241 and OPA251
(single op amp versions) provide offset voltage trim connec-
tions on pins 1 and 5. Offset voltage can be adjusted by
connecting a potentiometer as shown in Figure 1. This
adjustment should be used only to null the offset of the op
amp, not to adjust system offset or offset produced by the
signal source. Nulling offset could degrade the offset drift
behavior of the op amp. While it is not possible to predict the
exact change in drift, the effect is usually small.
10k
1k
G = 10
G = –1
G = +1
Sinking
Sourcing
100
–1
–0.1
–0.01
0
0.01
0.1
1
Output Current (mA)
FIGURE 2. Stability—Capacitive Load versus Output Cur-
rent for Low Supply Voltage.
V+
OPA241 and OPA251 (single op amps) only.
0.01µF
Use offset adjust pins only to null
offset voltage of op amp—see text.
7
2
3
6
OPA241
100k
5
VS = ±15V
Operation above
selected gain curve
not recommended
1
4
0.01µF
100kΩ
10k
1k
G = 10
G = +1
Trim Range: ±2mV
(V–) = 0V for single-supply operation.
G = –1
V–
FIGURE 1. OPA241 and OPA251 Offset Voltage Trim
Circuit.
Sinking
Sourcing
100
CAPACITIVE LOAD AND STABILITY
–1
–0.1
–0.01
0
0.01
0.1
1
Output Current (mA)
The OPA241 series and OPA251 series can drive a wide
range of capacitive loads. However, all op amps under
certain conditions may be unstable. Op amp configuration,
gain, and load value are just a few of the factors to consider
when determining stability.
FIGURE 3. Stability—Capacitive Load versus Output Cur-
rent for ±15V Supplies.
®
OPA241, 2241, 4241
OPA251, 2251, 4251
9
RS
5kΩ
OPA241
VOUT
VIN
CL
FIGURE 4. Series Resistor in Unity Gain Configuration Improves Capacitive Load Drive.
RH
10Ω
To Load
R5
383kΩ
IH
High-Side
Current Sense
R3
38.3kΩ
R1
V+
38.3kΩ
–In
+In
Out
A1
OPA241
VO = 10 • IH • RH
V–
V+ for A1, A2
R4
20kΩ
R2
19.1kΩ
+
R2 and R4 divide down the
common-mode input to A1.
2.7V to ±15V
R8
100kΩ
V– for A1, A2
V+
–In
A2
OPA241
Out
VO = 10 • IL • RL
+In
Low-Side
Current Sense
V–
R7
9.09kΩ
Common-mode range of A2
extends to V– for low-side sensing.
R6
10kΩ
RL
10Ω
Optional for IB Cancellation
(R7 = R6 II R8)
To Load
IL
NOTE: Low and high-side sensing circuits can be used independently.
FIGURE 5. Low and High-Side Battery Current Sensing.
®
OPA241, 2241, 4241
10
OPA251, 2251, 4251
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