BB OPA237

SO-8
single/dual
®
OPA237
OPA2237
OPA4237
SSOP-16
quad
SOT-23-5
single
MSOP dual
SINGLE-SUPPLY OPERATIONAL AMPLIFIERS
MicroAmplifier ™ Series
FEATURES
DESCRIPTION
● MICRO-SIZE, MINIATURE PACKAGES
Single: SOT-23-5, SO-8
Dual: MSOP-8, SO-8
Quad: SSOP-16
The OPA237 op amp family is one of Burr-Brown’s
MicroAmplifier series of miniature products. In addition to small size, these devices feature low offset
voltage, low quiescent current, low bias current, and a
wide supply range. Single, dual, and quad versions
have identical specifications for maximum design flexibility. They are ideal for single supply, battery operated, and space-limited applications, such as PCMCIA
cards and other portable instruments.
OPA237 series op amps can operate from either single
or dual supplies. When operated from a single supply,
the input common-mode range extends below ground
and the output can swing to within 10mV of ground.
Dual and quad designs feature completely independent circuitry for lowest crosstalk and freedom from
interaction.
Single, dual, and quad are offered in space-saving
surface-mount packages. The single version is available
in the ultra-miniature 5-lead SOT-23-5 and SO-8 surface-mount. The dual version comes in a miniature
MSOP-8 and SO-8 surface-mount. The quad is available in an SSOP-16. The SSOP-16 has the same body
size as an SO-8 with 16 leads, while the MSOP-8 has the
same lead count as a SO-8 but half the size. The
SOT-23-5 is even smaller at one-fourth the size of an
SO-8. All are specified for –40°C to +85°C operation. A
macromodel is available for design analysis.
● LOW OFFSET VOLTAGE: 750µV max
● WIDE SUPPLY RANGE
Single Supply: +2.7V to +36V
Dual Supply: ±1.35V to ±18V
● LOW QUIESCENT CURRENT: 350µA max
● WIDE BANDWIDTH: 1.5MHz
APPLICATIONS
● BATTERY POWERED INSTRUMENTS
● PORTABLE DEVICES
● PCMCIA CARDS
● MEDICAL INSTRUMENTS
● TEST EQUIPMENT
OPA237
Out
1
V–
2
+In
3
5
V+
4
–In
OPA4237
SOT-23-5
OPA237
OPA2237
NC
1
8
NC
Out A
1
–In
2
7
V+
–In A
2
+In
3
6
Output
V–
4
5
NC
SO-8
+In A
3
V–
4
A
B
Out A
1
V+
7
Out B
6
–In B
5
+In B
Out D
–In A
2
15
–In D
+In A
3
14
+In D
A
8
16
D
V+
4
13
V–
+In B
5
12
+In C
–In B
6
11
–In C
Out B
7
10
Out C
NC
8
9
NC
B
C
SO-8, MSOP-8
SSOP-16
InternationalAirportIndustrialPark • MailingAddress:POBox11400,Tucson,AZ85734 • StreetAddress:6730S.TucsonBlvd.,Tucson,AZ 85706 • Tel:(520)746-1111 • Twx:910-952-1111
Internet:http://www.burr-brown.com/ • FAXLine:(800)548-6133(US/CanadaOnly) • Cable:BBRCORP • Telex:066-6491 • FAX:(520)889-1510 • ImmediateProductInfo:(800)548-6132
© 1996 Burr-Brown Corporation
PDS-1327B
Printed in U.S.A. October, 1996
SPECIFICATIONS: VS = +5V
At TA = +25°C, VS = +5V, RL = 10kΩ connected to VS/2, unless otherwise noted.
OPA237UA, NA
OPA2237UA, EA
OPA4237UA
PARAMETER
CONDITION
OFFSET VOLTAGE
Input Offset Voltage
vs Temperature(1)
vs Power Supply (PSRR)
Channel Separation (dual and quad)
INPUT BIAS CURRENT
Input Bias Current(2)
Input Offset Current
MIN
TYP
MAX
UNITS
VCM = 2.5V
Specified Temperature Range
VS = +2.7V to +36V
±250
±2
10
0.5
±750
±5
30
µV
µV/°C
µV/V
µV/V
VCM = 2.5V
VCM = 2.5V
–10
±0.5
–40
±10
nA
nA
NOISE
Input Voltage Noise, f = 0.1 to 10Hz
Input Voltage Noise Density, f = 1kHz
Current Noise Density, f = 1kHz
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection
VCM = –0.2V to 3.5V
–0.2
78
INPUT IMPEDANCE
Differential
Common-Mode
OPEN-LOOP GAIN
Open-Loop Voltage Gain
FREQUENCY RESPONSE
Gain-Bandwidth Product
Slew Rate
Settling Time: 0.1%
0.01%
OUTPUT
Voltage Output, Positive
Negative
Positive
Negative
Positive
Negative
Short-Circuit Current
Capacitive Load Drive (stable operation)
µVp-p
nV/√Hz
fA/√Hz
1
28
60
VO = 0.5V to 4V
80
G=1
G = –1, 3V Step, CL = 100pF
G = –1, 3V Step, CL = 100pF
RL = 100kΩ to Ground
RL = 100kΩ to Ground
RL = 100kΩ to 2.5V
RL = 100kΩ to 2.5V
RL = 10kΩ to 2.5V
RL = 10kΩ to 2.5V
POWER SUPPLY
Specified Operating Voltage
Operating Range
Quiescent Current (per amplifier)
(V+) –1
0.01
(V+) –1
0.12
(V+) –1
0.5
86
(V+) –1.5
V
dB
5 • 106 || 4
5 • 109 || 2
Ω || pF
Ω || pF
88
dB
1.4
0.5
11
16
MHz
V/µs
µs
µs
(V+) –0.75
0.001
(V+) –0.75
0.04
(V+) –0.75
0.35
–10/+4
See Typical Curves
V
V
V
V
V
V
mA
+5
+2.7
170
TEMPERATURE RANGE
Specified Range
Operating Range
Storage
Thermal Resistance, θJA
5-Lead SOT-23-5
MSOP-8 Surface-Mount
SSOP-16 Surface-Mount
SO-8 Surface-Mount
–40
–55
–55
200
150
150
150
+36
350
V
V
µA
+85
+125
+125
°C
°C
°C
°C/W
°C/W
°C/W
°C/W
NOTES: (1) Guaranteed by wafer-level test to 95% confidence. (2) Positive conventional current flows into the input terminals.
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.
®
OPA237, 2237, 4237
2
SPECIFICATIONS: VS = +2.7V
At TA = +25°C, VS = +2.7V, RL = 10kΩ connected to VS/2, unless otherwise noted.
OPA237UA, NA
OPA2237UA, EA
OPA4237UA
PARAMETER
OFFSET VOLTAGE
Input Offset Voltage
vs Temperature(1)
vs Power Supply (PSRR)
Channel Separation (dual and quad)
INPUT BIAS CURRENT
Input Bias Current(2)
Input Offset Current
CONDITION
MIN
TYP
MAX
UNITS
VCM = 1V
Specified Temperature Range
VS = +2.7V to +36V
±250
±2
10
0.5
±750
±5
30
µV
µV/°C
µV/V
µV/V
VCM = 1V
VCM = 1V
–10
±0.5
–40
±10
nA
nA
NOISE
Input Voltage Noise, f = 0.1 to 10Hz
Input Voltage Noise Density, f = 1kHz
Current Noise Density, f = 1kHz
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection
VCM = –0.2V to 1.2V
–0.2
75
INPUT IMPEDANCE
Differential
Common-Mode
OPEN-LOOP GAIN
Open-Loop Voltage Gain
FREQUENCY RESPONSE
Gain-Bandwidth Product
Slew Rate
Settling Time: 0.1%
0.01%
OUTPUT
Voltage Output, Positive
Negative
Positive
Negative
Positive
Negative
Short-Circuit Current
Capacitive Load Drive (stable operation)
µVp-p
nV/√Hz
fA/√Hz
1
28
60
VO = 0.5V to 1.7V
80
G=1
G = –1, 1V Step, CL = 100pF
G = –1, 1V Step, CL = 100pF
RL = 100kΩ to Ground
RL = 100kΩ to Ground
RL = 100kΩ to 1.35V
RL = 100kΩ to 1.35V
RL = 10kΩ to 1.35V
RL = 10kΩ to 1.35V
POWER SUPPLY
Specified Operating Voltage
Operating Range
Quiescent Current (per amplifier)
(V+) –1
0.01
(V+) –1
0.06
(V+) –1
0.3
85
(V+) –1.5
V
dB
5 • 106 || 4
5 • 109 || 2
Ω || pF
Ω || pF
88
dB
1.2
0.5
5
8
MHz
V/µs
µs
µs
(V+) –0.75
0.001
(V+) –0.75
0.02
(V+) –0.75
0.2
–5/+3.5
See Typical Curves
V
V
V
V
V
V
mA
+2.7
+2.7
160
TEMPERATURE RANGE
Specified Range
Operating Range
Storage
Thermal Resistance, θJA
5-Lead SOT-23-5
MSOP-8 Surface-Mount
SSOP-16 Surface-Mount
SO-8 Surface-Mount
–40
–55
–55
+36
350
V
V
µA
+85
+125
+125
°C
°C
°C
200
150
150
150
°C/W
°C/W
°C/W
°C/W
NOTES: (1) Guaranteed by wafer-level test to 95% confidence. (2) Positive conventional current flows into the input terminals.
®
3
OPA237, 2237, 4237
SPECIFICATIONS: VS = ±15V
At TA = +25°C, VS = ±15V, RL = 10kΩ connected to VS/2, unless otherwise noted.
OPA237UA, NA
OPA2237UA, EA
OPA4237UA
PARAMETER
CONDITION
OFFSET VOLTAGE
Input Offset Voltage
vs Temperature(1)
vs Power Supply (PSRR)
Channel Separation (dual and quad)
INPUT BIAS CURRENT
Input Bias Current(2)
Input Offset Current
MIN
TYP
MAX
UNITS
VCM = 0V
Specified Temperature Range
VS = ±1.35V to ±18V
±350
±2.5
10
0.5
±950
±7
30
µV
µV/°C
µV/V
µV/V
VCM = 0V
VCM = 0V
–8.5
±0.5
–40
±10
nA
nA
NOISE
Input Voltage Noise, f = 0.1 to 10Hz
Input Voltage Noise Density, f = 1kHz
Current Noise Density, f = 1kHz
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection
VCM = –15V to 13.5V
(V–) –0.2
80
INPUT IMPEDANCE
Differential
Common-Mode
OPEN-LOOP GAIN
Open-Loop Voltage Gain
FREQUENCY RESPONSE
Gain-Bandwidth Product
Slew Rate
Settling Time: 0.1%
0.01%
OUTPUT
Voltage Output, Positive
Negative
Positive
Negative
Short-Circuit Current
Capacitive Load Drive (stable operation)
VO = –14V to 13.8V
80
G=1
G = –1, 10V Step, CL = 100pF
G = –1, 10V Step, CL = 100pF
RL = 100kΩ
RL = 100kΩ
RL = 10kΩ
RL = 10kΩ
POWER SUPPLY
Specified Operating Voltage
Operating Range
Quiescent Current (per amplifier)
(V+) –1.2
(V–) +0.5
(V+) –1.2
(V–) +1
±1.35
TEMPERATURE RANGE
Specified Range
Operating Range
Storage
Thermal Resistance, θJA
5-Lead SOT-23-5
MSOP-8 Surface-Mount
SSOP-16 Surface-Mount
SO-8 Surface-Mount
90
(V+) –1.5
V
dB
5 • 106 || 4
5 • 109 || 2
Ω || pF
Ω || pF
88
dB
1.5
0.5
18
21
MHz
V/µs
µs
µs
(V+) –0.9
(V–) +0.3
(V+) –0.9
(V–) +0.85
–8/+4.5
See Typical Curves
V
V
V
V
mA
±15
±200
–40
–55
–55
200
150
150
150
NOTES: (1) Guaranteed by wafer-level test to 95% confidence. (2) Positive conventional current flows into the input terminals.
®
OPA237, 2237, 4237
µVp-p
nV/√Hz
fA/√Hz
1
28
60
4
±18
±475
V
V
µA
+85
+125
+125
°C
°C
°C
°C/W
°C/W
°C/W
°C/W
ABSOLUTE MAXIMUM RATINGS
ELECTROSTATIC
DISCHARGE SENSITIVITY
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
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.
NOTE: (1) Short circuit to ground, one amplifier per package.
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
PRODUCT
PACKAGE
PACKAGE
DRAWING
NUMBER(1)
Single
OPA237NA
5-Lead SOT-23-5
331
–40°C to +85°C
A37A
"
"
"
"
"
OPA237UA
SO-8 Surface-Mount
182
–40°C to +85°C
OPA237UA
Dual
OPA2237EA
MSOP-8 Surface-Mount
337
–40°C to +85°C
B37A
"
"
"
"
"
OPA2237UA
SO-8 Surface-Mount
182
–40°C to +85°C
OPA2237UA
Quad
OPA4237UA
SSOP-16 Surface-Mount
322
–40°C to +85°C
OPA4237UA
"
"
"
"
"
TEMPERATURE
RANGE
PACKAGE
MARKING
ORDERING
NUMBER(2)
OPA237NA-250
OPA237NA-3K
OPA237UA
OPA2237EA-250
OPA2237EA-2500
OPA2237UA
OPA4237UA-250
OPA4237UA-2500
NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) Models with -250, -2500, and
-3K are available only in Tape and Reel in the quantity indicated (e.g., -250 indicates 250 devices per reel). Ordering 3000 pieces of “OPA237NA-3K” will get a
single 3000 piece Tape and Reel. SO-8 models are available in tubes or Tape and Reel. For detailed Tape and Reel mechanical information, refer to
Appendix B of Burr-Brown IC Data Book.
®
5
OPA237, 2237, 4237
TYPICAL PERFORMANCE CURVES
At TA = +25°C and RL = 10kΩ, unless otherwise noted.
POWER SUPPLY and COMMON-MODE REJECTION
vs FREQUENCY
OPEN-LOOP GAIN/PHASE vs FREQUENCY
100
120
CL = 100pF
G
+PSR (VS = +5V, ±15V)
0
–45
Φ
VS = ±15V
40
–90
20
–135
0
PSR, CMR (dB)
60
100
Phase (°)
Voltage Gain (dB)
80
–180
VS = +2.7V, +5V
CMR (VS = +2.7V, +5V or ±15V)
80
60
40
+PSR
(VS = +2.7V)
–PSR
(VS = ±15V)
20
–20
0
10
1
100
1k
10k
100k
1M
10M
10
100
1k
Frequency (Hz)
INPUT NOISE AND CURRENT NOISE
SPECTRAL DENSITY vs FREQUENCY
1M
10M
CHANNEL SEPARATION vs FREQUENCY
Channel Separation (dB)
Voltage Noise (nV/√Hz)
Current Noise (fA/√Hz)
100k
130
1k
Current Noise
100
120
110
100
90
Voltage Noise
80
10
10
1
100
1k
10k
Dual and quad devices.
G = 1, all channels.
Quad measured channel
A to D or B to C—other
combinations yield improved
rejection.
10
100k
100
1k
Frequency (Hz)
10k
100k
Frequency (Hz)
INPUT BIAS CURRENT
vs INPUT COMMON-MODE VOLTAGE
INPUT BIAS CURRENT vs TEMPERATURE
–12
14
–11
12
Input Bias Current (nA)
Input Bias Current (nA)
10k
Frequency (Hz)
VS = +2.7V, +5V
10
8
VS = ±15V
6
VS = +5V
VS = +2.7V
–10
–9
VS = ±15V
–8
–7
–6
4
–75
–50
–25
0
25
50
75
100
–15
125
®
OPA237, 2237, 4237
–10
–5
0
5
Common-Mode Voltage (V)
Temperature (°C)
6
10
15
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C and RL = 10kΩ, unless otherwise noted.
OFFSET VOLTAGE
PRODUCTION DISTRIBUTION
OFFSET VOLTAGE
PRODUCTION DISTRIBUTION
9
VS = +2.7V, +5V
8
7.5
5
2.5
0.2%
0.4%
0.7%
5
4
3
2
0.1%
0.1%
0
–950
–850
–750
–650
–550
–450
–350
–250
–150
–50
50
150
250
350
450
550
650
750
850
950
750
650
550
450
350
250
50
150
–50
–150
–250
–450
–550
–650
–750
–350
Offset Voltage (µV)
Offset Voltage (µV)
OFFSET VOLTAGE DRIFT
PRODUCTION DISTRIBUTION
OFFSET VOLTAGE DRIFT
PRODUCTION DISTRIBUTION
30
16
Typical production
distribution of packaged
units. Single, dual,
and quad units included.
25
20
15
10
5
0.2%
Typical production
distribution of packaged
units. Single, dual,
and quad units included.
VS = +5V
14
Percent of Amplifiers (%)
VS = +2.7V
12
10
8
6
4
0.6% 0.2% 0.4%
2
0.2%
0
0.2%
Typical production
distribution of packaged
units. Single, dual,
and quad units included.
AOL, CMR, PSR (dB)
6
4
2
8
7
7.5
6
6.5
5
5.5
4
4.5
3
CMR
AOL
PSR
110
8
0.2%
0.4%
3.5
AOL, CMR, PSR vs TEMPERATURE
120
12
VS = ±15V
2
Offset Voltage Drift (µV/°C)
OFFSET VOLTAGE DRIFT
PRODUCTION DISTRIBUTION
10
2.5
1
0.5
11.5
10.5
9.5
8.5
7.5
6.5
5.5
4.5
3.5
2.5
1.5
0.5
0
Offset Voltage Drift (µV/°C)
VS = +2.7V, +5V, ±15V
100
VS = ±15V
VS = +2.7V, +5V
90
80
VS = +2.7V, +5V
70
0.4%
VS = ±15V
60
–75
8
7.5
7
6
6.5
5.5
5
4
4.5
3.5
3
2.5
2
1.5
1
0
0.5
Percent of Amplifiers (%)
VS = ±15V
6
1
0
Percent of Amplifiers (%)
7
Typical production
distribution of packaged
units. Single, dual,
and quad units included.
1.5
10
Typical production
distribution of packaged
units. Single, dual,
and quad units included.
Percent of Amplifiers (%)
Percent of Amplifiers (%)
12.5
–50
–25
0
25
50
75
100
125
Temperature (°C)
Offset Voltage Drift (µV/°C)
®
7
OPA237, 2237, 4237
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C and RL = 10kΩ, unless otherwise noted.
SMALL-SIGNAL STEP RESPONSE
G = 1, C L = 100pF, VS = +5V
20mV/div
20mV/div
SMALL-SIGNAL STEP RESPONSE
G = 1, CL = 220pF, VS = +5V
2µs/div
1µs/div
LARGE-SIGNAL STEP RESPONSE
G = 1, C L = 100pF, VS = +5V
SETTLING TIME vs GAIN
100
VS = ±15V,
10V Step
1V/div
Settling Time (µs)
VS = +5V,
3V Step
10
VS = +2.7V,
1V Step
0.01%
0.1%
1
–1
10µs/div
–10
–100
Gain (V/V)
SMALL-SIGNAL OVERSHOOT
vs LOAD CAPACITANCE
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
70
V+
(V+) –1
+25°C
(V+) –1.5
(V+) –2
+125°C
+125°C
Sinking Current
(V–) +1.5
50
–55°C
(V–) +2
(V–) +1
+125°C
0
1
30
10
+25°C
V–
40
20
–55°C
(V–) +0.5
G = +1, VS = +2.7V, +5V
G = +1, VS = ±15V
G = –1, VS = +2.7V, +5V
G = –1, VS = ±15V
G = –2, VS = +2.7V, +5V
G = –2, VS = ±15V
G = –10, VS = +2.7V,
+5V, ±15V
60
Sourcing Current
Overshoot (%)
Output Voltage Swing (V)
(V+) –0.5
0
2
3
4
10
5
1k
Load Capacitance (pF)
Output Current (mA)
®
OPA237, 2237, 4237
100
8
10k
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C and RL = 10kΩ, unless otherwise noted.
MAXIMUM OUTPUT VOLTAGE
vs FREQUENCY
QUIESCENT CURRENT vs TEMPERATURE
30
300
Quiescent Current (µA)
VS = ±15V
Maximum output voltage
without slew-rate induced
distortion
20
15
10
VS = +5V
5
VS = ±15V
250
200
150
VS = +5V
VS = +2.7V
100
VS = +2.7V
0
50
1k
10k
100k
1M
–75
–50
–25
Frequency (Hz)
0
25
50
75
100
125
Temperature (°C)
SHORT-CIRCUIT CURRENT vs TEMPERATURE
12
Short-Circuit Current (mA)
Output Voltage (Vp-p)
25
VS = +5V
10
8
VS = ±15V
VS = +2.7V
6
_
ISC
4
+
ISC
2
VS = ±15V
VS = +2.7V
VS = +5V
0
–75
–50
–25
0
25
50
75
100
125
Temperature (°C)
®
9
OPA237, 2237, 4237
APPLICATIONS INFORMATION
+5V supply with a 10kΩ load to VS/2 is used. OPA237
series op amps remain stable with capacitive loads up to
4,000pF, if sinking current and up to 10,000pF, if sourcing
current. Furthermore, in single supply applications where
the load is connected to ground, the op amp is only
sourcing current, and as shown in Figure 1, can drive
10,000pF with output currents up to 1.5mA.
OPA237 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 capacitors.
OPERATING VOLTAGE
OPA237 series op amps operate from single (+2.7V to
+36V) or dual (±1.35V to ±18V) supplies with excellent
performance. Most behavior remains unchanged throughout the full operating voltage range. Parameters which
vary significantly with operating voltage are shown in
typical performance curves. Specifications are production
tested with +2.7V, +5V, and ±15V supplies.
100k
Capacitive Load (pF)
OPERATION NOT
RECOMMENDED
OUTPUT CURRENT AND STABILITY
OPA237 series op amps can drive large capacitive loads.
However, under certain limited output conditions any op
amp may become unstable. Figure 1 shows the region
where the OPA237 has a potential for instability. These
load conditions are rarely encountered, especially for single
supply applications. For example, take the case when a
10k
1k
VS = +5V, ±15V
100
VS = +2.7V
10
–1.5
–2
–1
–0.5
0
0.5
1
To Load
R5
383kΩ
IH
High-Side
Current Sense
R3
38.3kΩ
V+
–In
A1
+In OPA237
V+ for A1, A2
R4
20kΩ
R2
19.1kΩ
Out
VO = 10 • IH • RH
V–
+
2.7V to ±15V
R2 and R4 divide down the
common-mode input to A1.
R8
100kΩ
V– for A1, A2
V+
–In
A2
+In OPA237
V–
R7
9.09kΩ
R6
10kΩ
RL
10Ω
Out
VO = 10 • IL • RL
Low-Side
Current Sense
Common-mode range of A2
extends to V– for low-side sensing.
Optional for IB Cancellation
(R7 = R6 II R8)
To Load
IL
NOTE: Low and high-side sensing circuits can be used independently.
FIGURE 2. Low and High-Side Battery Current Sensing.
®
OPA237, 2237, 4237
2
FIGURE 1. Stability-Capacitive Load vs Output Current.
RH
10Ω
R1
38.3kΩ
1.5
Output Current (mA)
10