1
®
OPA234, 2234, 4234
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Out D
–In D
+In D
V–
+In C
–In C
Out C
Out A
–In A
+In A
V+
+In B
–In B
Out B
OPA4234
14-Pin DIP
SO-14
AD
BC
®
OPA234
OPA2234
OPA4234
Low Power, Precision
SINGLE-SUPPLY OPERATIONAL AMPLIFIERS
FEATURES
● WIDE SUPPLY RANGE:
Single Supply: VS = +2.7V to +36V
Dual Supply: VS = ±1.35V to ±18V
● GUARANTEED PERFORMANCE:
+2.7V, +5V, and ±15V
● LOW QUIESCENT CURRENT: 250µA/amp
● LOW INPUT BIAS CURRENT: 25nA max
● LOW OFFSET VOLTAGE: 100µV max
● HIGH CMRR, PSRR, and AOL
●SINGLE, DUAL, and QUAD VERSIONS
DESCRIPTION
The OPA234 series low cost op amps are ideal for
single supply, low voltage, low power applications. The
series provides lower quiescent current than older
“1013”-type products and comes in current industry-
standard packages and pinouts. The combination of low
offset voltage, high common-mode rejection, high power
supply rejection, and a wide supply range provides
excellent accuracy and versatility. Single, dual, and
quad versions have identical specifications for maxi-
mum design flexibility. These general purpose op amps
are ideal for portable and battery powered applications.
OPA234 series op amps operate from either single or
dual supplies. In single supply operation, the input com-
mon-mode range extends below ground and the output
can swing to within 50mV of ground. Excellent phase
margin makes the OPA234 series ideal for demanding
applications, including high load capacitance. Dual and
quad designs feature completely independent circuitry
for lowest crosstalk and freedom from interaction.
Single version packages are DIP-8, SO-8 surface-mount,
and a space-saving MSOP-8 surface-mount. Dual pack-
ages are DIP-8 and SO-8 surface-mount. Quad pack-
ages are DIP-14 and SO-14 surface-mount. All are
specified for –40°C to +85°C operation.
1
2
3
4
8
7
6
5
V+
Out B
–In B
+In B
Out A
–In A
+In A
V–
OPA2234
8-Pin DIP, SO-8
A
B
1
2
3
4
8
7
6
5
NC
V+
Output
Offset Trim
Offset Trim
–In
+In
V–
OPA234
8-Pin DIP, SO-8, MSOP-8
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/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
OPA234
OPA234
OPA2234
OPA2234
OPA4234
OPA234
OPA4234
© 1996 Burr-Brown Corporation PDS-1318B Printed in U.S.A., May, 2000
For most current data sheet and other product
information, visit www.burr-brown.com
2
®
OPA234, 2234, 4234
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.
SPECIFICATIONS: VS = +5V
At TA = 25°C, VS = +5V, RL = 10kΩ connected to VS/2 and VOUT = VS/2, unless otherwise noted.
OPA234P, U, E
OPA2234P, U
OPA234PA, UA, EA
OPA2234PA, UA
OPA4234PA, UA, U
PARAMETER CONDITION MIN TYP MAX MIN TYP MAX UNITS
OFFSET VOLTAGE
Input Offset Voltage VOS VCM = 2.5V ±40 ±100 ✻±250 µV
OPA234E, EA ±100 ±150 ✻±350 µV
vs Temperature(1) dVOS/dT Operating Temperature Range ±0.5 ±3✻✻µV/°C
vs Power Supply PSRR VS = +2.7V to +30V, VCM = 1.7V 3 10 ✻20 µV/V
vs Time 0.2 ✻µV/mo
Channel Separation (Dual, Quad) 0.3 ✻µV/V
INPUT BIAS CURRENT
Input Bias Current(2) IBVCM = 2.5V –15 –30 ✻–50 nA
Input Offset Current IOS VCM = 2.5V ±1±5✻✻nA
NOISE f = 1kHz
Input Voltage Noise Density vn25 ✻nV/√Hz
Current Noise Density in80 ✻fA/√Hz
INPUT VOLTAGE RANGE
Common-Mode Voltage Range –0.1 (V+) –1 ✻✻V
Common-Mode Rejection CMRR VCM = –0.1V to 4V 91 106 86 ✻dB
INPUT IMPEDANCE
Differential 107 || 5 ✻Ω || pF
Common-Mode VCM = 2.5V 1010 || 6 ✻Ω || pF
OPEN-LOOP GAIN VO = 0.25V to 4V
Open-Loop Voltage Gain AOL RL = 10kΩ108 120 100 ✻dB
RL = 2kΩ86 96 86 ✻dB
FREQUENCY RESPONSE
Gain-Bandwidth Product GBW CL = 100pF 0.35 ✻MHz
Slew Rate SR 0.2 ✻V/µs
Settling Time: 0.1% G = 1, 3V Step, CL = 100pF 15 ✻µs
0.01% G = 1, 3V Step, CL = 100pF 25 ✻µs
Overload Recovery Time (VIN) (Gain) = VS16 ✻µs
OUTPUT
Voltage Output: Positive RL = 10kΩ to VS/2 (V+) –1
(V+) –0.65
✻✻ V
Negative RL = 10kΩ to VS/2 0.25 0.05 ✻✻ V
Positive RL = 10kΩ to Ground (V+) –1
(V+) –0.65
✻✻ V
Negative RL = 10kΩ to Ground 0.1 0.05 ✻✻ V
Short-Circuit Current ISC ±11 ✻mA
Capacitive Load Drive (Stable Operation)(3) G = +1 1000 ✻pF
POWER SUPPLY
Specified Operating Voltage +5 ✻V
Operating Voltage Range +2.7 +36 ✻✻V
Quiescent Current (per amplifier) IQIO = 0 250 300 ✻✻µA
TEMPERATURE RANGE
Specified Range –40 +85 ✻✻°C
Operating Range –40 +125 ✻✻°C
Storage –55 +125 ✻✻°C
Thermal Resistance
θ
JA
8-Pin DIP 100 ✻°C/W
SO-8 Surface-Mount 150 ✻°C/W
MSOP-8 Surface-Mount 220 ✻°C/W
14-Pin DIP 80 ✻°C/W
SO-14 Surface-Mount 110 ✻°C/W
✻ Specifications same as OPA234P,U,E.
NOTES: (1) Guaranteed by wafer-level test to 95% confidence level. (2) Positive conventional current flows into the input terminals. (3) See “Small-Signal Overshoot
vs Load Capacitance” typical curve.
3
®
OPA234, 2234, 4234
SPECIFICATIONS: VS = +2.7V
At TA = 25°C, VS = +2.7V, RL = 10kΩ connected to VS/2 and VOUT = VS/2, unless otherwise noted.
OPA234P, U, E
OPA2234P, U
OPA234PA, UA, EA
OPA2234PA, UA
OPA4234PA, UA, U
PARAMETER CONDITION MIN TYP MAX MIN TYP MAX UNITS
OFFSET VOLTAGE
Input Offset Voltage VOS VCM = 1.35V ±40 ±100 ✻±250 µV
OPA234E, EA ±100 ±150 ✻±350 µV
vs Temperature(1) dVOS/dT Operating Temperature Range ±0.5 ±3✻✻µV/°C
vs Power Supply PSRR VS = +2.7V to +30V, VCM = 1.7V 3 10 ✻20 µV/V
vs Time 0.2 ✻µV/mo
Channel Separation (Dual, Quad) 0.3 ✻µV/V
INPUT BIAS CURRENT
Input Bias Current(2) IBVCM = 1.35V –15 –30 ✻–50 nA
Input Offset Current IOS VCM = 1.35V ±1±5✻✻ n
NOISE f = 1kHz
Input Voltage Noise Density vn25 ✻nV/√Hz
Current Noise Density in80 ✻fA/√Hz
INPUT VOLTAGE RANGE
Common-Mode Voltage Range –0.1 (V+) –1 ✻✻V
Common-Mode Rejection CMRR VCM = –0.1V to 1.7V 91 106 86 ✻dB
INPUT IMPEDANCE
Differential 107 || 5 ✻Ω || pF
Common-Mode VCM = 1.35V 1010 || 6 ✻Ω || pF
OPEN-LOOP GAIN VO = 0.25V to 1.7V
Open-Loop Voltage Gain AOL RL = 10kΩ108 125 100 ✻dB
RL = 2kΩ86 96 86 ✻dB
FREQUENCY RESPONSE
Gain-Bandwidth Product GBW CL = 100pF 0.35 ✻MHz
Slew Rate SR 0.2 ✻V/µs
Settling Time: 0.1% G = 1, 1V Step, CL = 100pF 6 ✻µs
0.01% G = 1, 1V Step, CL = 100pF 16 ✻µs
Overload Recovery Time (VIN) (Gain) = VS8✻µs
OUTPUT
Voltage Output: Positive RL = 10kΩ to VS/2 (V+) –1 (V+) –0.6 ✻✻ V
Negative RL = 10kΩ to VS/2 0.25 0.05 ✻✻ V
Positive RL = 10kΩ to Ground (V+) –1
(V+) –0.65
✻✻ V
Negative RL = 10kΩ to Ground 0.1 0.05 ✻✻ V
Short-Circuit Current ISC ±8✻mA
Capacitive Load Drive (Stable Operation)(3) G = +1 1000 ✻pF
POWER SUPPLY
Specified Operating Voltage +2.7 ✻V
Operating Voltage Range +2.7 +36 ✻✻V
Quiescent Current (per amplifier) IQIO = 0 250 300 ✻✻µA
TEMPERATURE RANGE
Specified Range –40 +85 ✻✻°C
Operating Range –40 +125 ✻✻°C
Storage –55 +125 ✻✻°C
Thermal Resistance
θ
JA
8-Pin DIP 100 ✻°C/W
SO-8 Surface-Mount 150 ✻°C/W
MSOP-8 Surface-Mount 220 ✻°C/W
14-Pin DIP 80 ✻°C/W
SO-14 Surface-Mount 110 ✻°C/W
✻ Specifications same as OPA234P,U,E.
NOTES: (1) Guaranteed by wafer-level test to 95% confidence level. (2) Positive conventional current flows into the input terminals. (3) See “Small-Signal Overshoot
vs Load Capacitance” typical curve.
4
®
OPA234, 2234, 4234
PARAMETER CONDITION MIN TYP MAX MIN TYP MAX UNITS
OFFSET VOLTAGE
Input Offset Voltage VOS VCM = 0V ±70 ±250 ✻±500 µV
OPA4234U Model ±70 ±250 µV
vs Temperature(1) dVOS/dT Operating Temperature Range ±0.5 ±5✻✻µV/°C
vs Power Supply PSRR VS = ±1.35V to ±18V, VCM = 0V 3 10 ✻20 µV/V
vs Time 0.2 ✻µV/mo
Channel Separation (Dual, Quad) 0.3 ✻µV/V
INPUT BIAS CURRENT
Input Bias Current(2) IBVCM = 0V –12 –25 ✻–50 nA
Input Offset Current IOS VCM = 0V ±1±5✻✻nA
NOISE f = 1kHz
Input Voltage Noise Density vn25 ✻nV/√Hz
Current Noise Density in80 ✻fA/√Hz
INPUT VOLTAGE RANGE
Common-Mode Voltage Range (V–) (V+) –1 ✻✻V
Common-Mode Rejection CMRR VCM = –15V to 14V 91 106 86 ✻dB
INPUT IMPEDANCE
Differential 107 || 5 ✻Ω || pF
Common-Mode VCM = 0V 1010 || 6 ✻Ω || pF
OPEN-LOOP GAIN
Open-Loop Voltage Gain AOL VO = –14.5V to 14V 110 120 100 ✻dB
FREQUENCY RESPONSE
Gain-Bandwidth Product GBW CL = 100pF 0.35 ✻MHz
Slew Rate SR 0.2 ✻V/µs
Settling Time: 0.1% G = 1, 10V Step, CL = 100pF 41 ✻µs
0.01% G = 1, 10V Step, CL = 100pF 47 ✻µs
Overload Recovery Time (VIN) (Gain) = VS22 ✻µs
OUTPUT
Voltage Output: Positive (V+) –1 (V+) –0.7 ✻✻ V
Negative (V–) +0.5
(V–) +0.15
✻✻ V
Short-Circuit Current ISC ±22 ✻mA
Capacitive Load Drive (Stable Operation)(3) G = +1 1000 ✻pF
POWER SUPPLY
Specified Operating Voltage ±15 ✻V
Operating Voltage Range ±1.35 ±18 ✻✻V
Quiescent Current (per amplifier) IQIO = 0 ±275 ±350 ✻✻µA
TEMPERATURE RANGE
Specified Range –40 +85 ✻✻°C
Operating Range –40 +125 ✻✻°C
Storage –55 +125 ✻✻°C
Thermal Resistance
θ
JA
8-Pin DIP 100 ✻°C/W
SO-8 Surface-Mount 150 ✻°C/W
MSOP-8 Surface-Mount 220 ✻°C/W
14-Pin DIP 80 ✻°C/W
SO-14 Surface-Mount 110 ✻°C/W
✻ Specifications same as OPA234P,U,E.
NOTES: (1) Guaranteed by wafer-level test to 95% confidence level. (2) Positive conventional current flows into the input terminals. (3) See “Small-Signal Overshoot
vs Load Capacitance” typical curve.
SPECIFICATIONS: VS = ±15V
At TA = 25°C, VS = ±15V, RL = 10kΩ connected to ground, unless otherwise noted.
OPA234P, U, E
OPA2234P, U
OPA234PA, UA, EA
OPA2234PA, UA
OPA4234PA, UA, U
5
®
OPA234, 2234, 4234
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.
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.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V+ to V–.................................................................... 36V
Input Voltage .....................................................(V–) –0.7V to (V+) +0.7V
Output Short-Circuit(1) .............................................................. Continuous
Operating Temperature ..................................................–40°C to +125°C
Storage Temperature .....................................................–55°C to +125°C
Junction Temperature...................................................................... 150°C
Lead Temperature (soldering, 10s)................................................. 300°C
NOTE: (1) Short-circuit to ground, one amplifier per package.
PACKAGE SPECIFIED
DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT
PRODUCT PACKAGE NUMBER RANGE MARKING NUMBER(1) MEDIA
Single
OPA234EA MSOP-8 Surface-Mount 337 –40°C to +85°C A34(2) OPA234EA/250 Tape and Reel
"""""OPA234EA/2K5 Tape and Reel
OPA234E MSOP-8 Surface-Mount 337 –40°C to +85°C A34(2) OPA234E/250 Tape and Reel
"""""OPA234E/2K5 Tape and Reel
OPA234PA Plastic DIP-8 006 –40°C to +85°C OPA234PA OPA234PA Rails
OPA234P """OPA234P OPA234P Rails
OPA234UA SO-8 Surface-Mount 182 –40°C to +85°C OPA234UA OPA234UA Rails
OPA234U """OPA234U OPA234U Rails
Dual
OPA2234PA Plastic DIP-8 006 –40°C to +85°C OPA2234PA OPA2234PA Rails
OPA2234P """OPA2234P OPA2234P Rails
OPA2234UA SO-8 Surface-Mount 182 –40°C to +85°C OPA2234UA OPA2234UA Rails
OPA2234U """OPA2234U OPA2234U Rails
Quad
OPA4234PA Plastic DIP-8 006 –40°C to +85°C OPA4234PA OPA4234PA Rails
OPA4234P """OPA4234P OPA4234P Rails
OPA4234UA SO-8 Surface-Mount 182 –40°C to +85°C OPA4234UA OPA4234UA Rails
OPA4234U """OPA4234U OPA4234U Rails
NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces
of “OPA234E//2K5” will get a single 2500-piece Tape and Reel. (2) The grade will be marked on the Reel.
PACKAGE/ORDERING INFORMATION
6
®
OPA234, 2234, 4234
INPUT NOISE AND CURRENT NOISE
SPECTRAL DENSITY vs FREQUENCY
1
1k
100
10
Voltage Noise (nV/√Hz)
Current Noise (fA/√Hz)
Frequency (Hz)
10 100 1k 10k 100k
Current Noise
Voltage Noise
TYPICAL PERFORMANCE CURVES
At TA = +25°C and RL = 10kΩ unless otherwise noted.
INPUT BIAS CURRENT
vs INPUT COMMON-MODE VOLTAGE
Common-Mode Voltage (V)
Input Bias Current (nA)
–17
–16
–15
–14
–13
–12
–11
–10–15 –10 –5 0 5 10 15
V
S
= +5V
V
S
= +2.7V
V
S
= ±15V
INPUT BIAS AND INPUT OFFSET CURRENT
vs TEMPERATURE
Ambient Temperature (°C)
Input Bias, Input Offset Current (nA)
–20
–15
–10
–5
0
+5–75 –50 –25 0 25 50 75 100 125
V
S
= +2.7V, +5V
I
OS
V
S
= ±15V I
B
OPEN-LOOP GAIN/PHASE vs FREQUENCY
0.1
140
120
100
80
60
40
20
0
–20
0
–30
–60
–90
–120
–150
–180
Voltage Gain (dB)
Phase (°)
Frequency (Hz)
1 10 100 1k 10k 100k 1M
C
L
= 100pF
G
φ
V
O
= 0.25V
V
S
= +5V
±15V
V
O
= V
S
2
V
S
= +2.7V
CMR
+PSR
POWER SUPPLY AND COMMON-MODE REJECTION
vs FREQUENCY
Frequency (Hz)
PSR, CMR (dB)
120
110
100
90
80
70
60
50
40
30
20
10
010 100 1k 10k 100k 1M
–PSR
V
S
= +2.7V, +5V
or ±15V
V
S
= +2.7V or +5V
V
S
= ±15V
CHANNEL SEPARATION vs FREQUENCY
Frequency (Hz)
Channel Separation (dB)
160
140
120
100
80 10 100 1k 10k 100k
Dual and quad devices.
G = 1, all channels.
Quad measured channel
A to D or B to C—other
combinations yield improved
rejection.
R
L
= 10kΩ
7
®
OPA234, 2234, 4234
TYPICAL PERFORMANCE CURVES (Cont.)
At TA = +25°C and RL = 10kΩ unless otherwise noted.
OFFSET VOLTAGE
PRODUCTION DISTRIBUTION
Percent of Amplifiers (%)
Offset Voltage (µV)
0
25
25
50
75
125
100
150
175
0.3% 0.1%
200
200
175
150
125
100
75
50
25
20
15
10
5
0
V
S
= +2.7V, +5V
Typical production
distribution of packaged
units. Single, dual, and
quad units included.
0.1%
OFFSET VOLTAGE
PRODUCTION DISTRIBUTION
Percent of Amplifiers (%)
Offset Voltage (µV)
0
100
200
300
400
500
–500
–400
–300
–200
–100
30
25
20
15
10
5
0
V
S
= ±15V
Typical production
distribution of packaged
units. Single, dual,
and quad units included.
0.2%
0.3%
0.7%
0.1% 0.5%
OFFSET VOLTAGE DRIFT
PRODUCTION DISTRIBUTION
Percent of Amplifiers (%)
Offset Voltage Drift (µV/°C)
3
3.5
4
4.5
5
0.5
1
1.5
2
2.5
35
30
25
20
15
10
5
0
0.1% 0.1%
0.2%
0.5%
0.3%
V
S
= +5V Typical production
distribution of packaged
units. Single, dual,
and quad units included.
OFFSET VOLTAGE DRIFT
PRODUCTION DISTRIBUTION
Percent of Amplifiers (%)
Offset Voltage Drift (µV/°C)
30
25
20
15
10
5
0
0.5
1.5
2
1
3
3.5
2.5
4
4.5
5
5.5
6
6.5
7
8
7.5
V
S
= ±15V Typical production
distribution of packaged
units. Single, dual,
and quad units included.
0.1% 0.1%0.1%
0.1%
0.2%
0.4% 0.3%
OFFSET VOLTAGE DRIFT
PRODUCTION DISTRIBUTION
Percent of Amplifiers (%)
Offset Voltage Drift (µV/°C)
3
3.5
4
4.5
5
0.5
1
1.5
2
2.5
35
30
25
20
15
10
5
0
0.1% 0.1%0.2% 0.1%
0.3%
V
S
= +2.7V Typical production
distribution of packaged
units. Single, dual,
and quad units included.
A
OL
, CMR, PSR vs TEMPERATURE
Ambient Temperature (°C)
A
OL
, CMR, PSR (dB)
140
130
120
110
100
90
80
70
60–75 –50 –25 0 25 50 75 100 125
CMR
PSR
V
CM
= (V–) –0.02V to (V+) –1V
A
OL
V
S
= +2.7V
V
S
= +5V
V
S
= ±15V
8
®
OPA234, 2234, 4234
TYPICAL PERFORMANCE CURVES (Cont.)
At TA = +25°C and RL = 10kΩ unless otherwise noted.
LARGE-SIGNAL STEP RESPONSE
G = 1, C
L
= 100pF, V
S
= +5V
1V/div
10µs/div
SMALL-SIGNAL STEP RESPONSE
G = 1, C
L
= 10,000pF, V
S
= +5V
20mV/div
20µs/div
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
V+
(V+) –0.5
(V+) –1
(V+) –1.5
(V+) –2
(V+) –2.5
(V+) –3
(V–) +3
(V–) +2.5
(V–) +2
(V–) +1.5
(V–) +1
(V–) +0.5
V– 0 ±5 ±10
125°C
85°C
25°C
±15
Output Current (mA)
Output Voltage Swing (V)
–55°C
–55°C
–40°C
25°C
85°C
125°C
–40°C
High output current may
not be available at low
supply voltages due to
output swing limitations.
SMALL-SIGNAL OVERSHOOT
vs LOAD CAPACITANCE
70
60
50
40
30
20
10
0
10pF 100pF 1nF 10nF 100nF
Load Capacitance
Overshoot (%)
G = –1,
G = +2
G = +1,
V
S
= +2.7, +5V
G = +1,
V
S
= ±15V G = ±10
G = –2
V
O
= 100mVp-p
SMALL-SIGNAL STEP RESPONSE
G = 1, C
L
= 100pF, V
S
= +5V
2µs/div
20mV/div
SETTLING TIME vs CLOSED-LOOP GAIN
Gain (V/V)
Settling Time (µs)
1000
100
10
1±1 ±10 ±100
V
S
= ±15V,
10V Step
V
S
= +2.7V,
1V Step
C
L
= 100pF
0.1%
0.01%
V
S
= +5V,
3V Step
9
®
OPA234, 2234, 4234
QUIESCENT CURRENT AND SHORT-CIRCUIT CURRENT
vs TEMPERATURE
Temperature (°C)
Quiescent Current (µA)
525
450
375
300
225
150
75
0
Short-Circuit Current (mA)
70
60
50
40
30
20
10
0
–75 –50 –25 0 25 50 75 100 125
±I
SC
±I
Q
V
S
= +2.7V
V
S
= +5V
V
S
= +2.7V or +5V
V
S
= ±15V
APPLICATIONS INFORMATION
OPA234 series op amps are unity-gain stable and suitable
for a wide range of general-purpose applications. Power
supply pins should be bypassed with 10nF ceramic capaci-
tors.
OPERATING VOLTAGE
OPA234 series op amps operate from single (+2.7V to
+36V) or dual (±1.35V to ±18V) supplies with excellent
performance. Specifications are production tested with
+2.7V, +5V, and ±15V supplies. Most behavior remains
unchanged throughout the full operating voltage range.
Parameters which vary significantly with operating volt-
age are shown in typical performance curves.
OFFSET VOLTAGE TRIM
Offset voltage of OPA234 series amplifiers is laser trimmed
and usually requires no user adjustment. The OPA234
(single op amp version) provides offset voltage trim con-
nections 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.
FIGURE 1. OPA234 Offset Voltage Trim Circuit.
V+
V–
100kΩ
OPA234 single op amp only.
Use offset adjust pins only to null
offset voltage of op amp—see text.
Trim Range: ±4mV typ
(V–) = 0V for single supply operation.
OPA234 6
7
5
4
3
2
1
10nF
10nF
TYPICAL PERFORMANCE CURVES (Cont.)
At TA = +25°C and RL = 10kΩ unless otherwise noted.
MAXIMUM OUTPUT VOLTAGE
vs FREQUENCY
100k
Frequency (Hz)
1k 10k
30
25
20
15
10
5
0
Output Voltage (Vp-p)
V
S
= ±2.7V
V
S
= +5V
Maximum output voltage
without slew-rate induced
distortion
V
S
= ±15V
