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부품번호 OPA2137 기능
기능 LOW COST FET-INPUT OPERATIONAL AMPLIFIERS MicroAmplifier Series
제조업체 Burr-Brown
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OPA2137 데이터시트, 핀배열, 회로
®
OPA4137
OPA137
OPA4137
OPA2137
OPA137
OPA2137
OPA4137
SBOS089
LOW COST
FET-INPUT OPERATIONAL AMPLIFIERS
MicroAmplifier Series
FEATURES
q FET INPUT: IB = 5pA
q LOW OFFSET VOLTAGE: 1.5mV
q WIDE SUPPLY RANGE: ±2.25V to ±18V
q LOW QUIESCENT CURRENT: 220µA/channel
q EXCELLENT SPEED/POWER: 1MHz
q INPUT TO POSITIVE SUPPLY
q MicroSIZE PACKAGES: SOT-23-5, MSOP-8
q SINGLE, DUAL, AND QUAD
APPLICATIONS
q STRAIN GAGE AMPLIFIER
q PHOTODETECTOR AMPLIFIER
q PRECISION INTEGRATOR
q BATTERY-POWERED INSTRUMENTS
q TEST EQUIPMENT
q ACTIVE FILTERS
OPA137
DESCRIPTION
OPA137 series FET-input operational amplifiers are designed
for low cost and miniature applications. In addition to small
size (SOT-23-5 and MSOP-8 packages), they provide low
input bias current (5pA), low quiescent currrent (220µA/
channel), and high open-loop gain (94dB).
Either single (+4.5V to +36V) or dual (±2.25 to ±18V)
supplies can be used. The input common-mode voltage range
includes the positive supply—suitable for many single-supply
applications. Single, dual, and quad versions have identical
specifications for maximum design flexibility.
OPA137 op amps are easy to use and free from phase
inversion and overload problems found in some FET-input
amplifiers. High performance, including linearity, is main-
tained as the amplifiers swing to their specified limits. In
addition, the combination of high slew rate (3.5V/µs) and
wide bandwidth (1MHz) provide fast settling time assuring
good dynamic response. Dual and quad designs feature com-
pletely independent circuitry for lowest crosstalk and freedom
from interaction.
The single (OPA137) packages are the tiny 5-lead SOT-23-5
surface mount, SO-8 surface mount, and 8-pin DIP. The dual
(OPA2137) comes in the miniature MSOP-8 surface mount,
SO-8 surface mount, and 8-pin DIP packages. The quad
(OPA4137) packages are the SO-14 surface mount and the
14-pin DIP. All are specified from –40°C to +85°C and operate
from –55°C to +125°C. A SPICE macromodel is available for
design analysis.
NC 1
–In 2
8 NC
7 V+
OPA4137
+In 3
6 Output
Out A 1
14 Out D
Out 1
V– 2
+In 3
OPA137
V– 4
5 NC
5 V+
8-Pin DIP, SO-8
4 –In
Out A 1
–In A 2
+In A 3
V– 4
OPA2137
A
B
8 V+
7 Out B
6 –In B
5 +In B
–In A 2
+In A 3
V+ 4
+In B 5
–In B 6
Out B 7
A
B
13 –In D
D
12 +In D
11 V–
10 +In C
C
9 –In C
8 Out C
SOT-23-5
8-Pin DIP, SO-8, MSOP-8
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
© 1998 Burr-Brown Corporation
PDS-1438A
Printed in U.S.A. August, 1998




OPA2137 pdf, 반도체, 판매, 대치품
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = ±15V, RL = 10k, connected to ground, unless otherwise noted.
100
80
60
40
20
0
–20
1
OPEN-LOOP GAIN/PHASE vs FREQUENCY
G
–40°C
φ
+85°C
+25°C
0
–45
–90
–135
–180
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
POWER SUPPLY AND COMMON-MODE REJECTION
vs FREQUENCY
100
80
+PSRR
60 CMRR
40
–PSRR
20
0
10 100 1k
10k 100k 1M
Frequency (Hz)
INPUT VOLTAGE AND CURRENT NOISE
SPECTRAL DENSITY vs FREQUENCY
1k 1
100
Voltage Noise
10
10
Current Noise
1
1
0.1
1
10 100 1k 10k
Frequency (Hz)
100k
0.1
1M
CHANNEL SEPARATION vs FREQUENCY
140
120
100
80
Dual and quad devices.
60 G = 1, all channels.
Quad measured channel
40 A to D or B to C—other
combinations yield improved
rejection.
20
100 1k 10k
Frequency (Hz)
100k
1M
INPUT BIAS CURRENT vs TEMPERATURE
10k
1k
100
10
1
0.1
–75 –50 –25
0 25 50
Temperature (°C)
75 100 125
1n
100p
INPUT BIAS CURRENT
vs INPUT COMMON-MODE VOLTAGE
Input bias current is a
function of the voltage
between the V– supply
and the inputs.
10p
1p
–15
–10 –5
0
5 10
Common-Mode Voltage (V)
15
®
OPA137, 2137, 4137
4

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OPA2137 전자부품, 판매, 대치품
APPLICATIONS INFORMATION
OPA137 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 or larger. All circuitry is completely independent in dual
and quad versions, assuring normal performance when one
amplifier in a package is overdriven or short circuited. Many
key parameters are guaranteed over the specified tempera-
ture range, –40°C to +85°C.
OPERATING VOLTAGE
OPA137 op amps can be operated on power supplies as low
as ±2.25V. Performance remains excellent with power sup-
plies ranging from ±2.25V to ±18V (+4.5V to +36V single
supply). Most parameters vary only slightly throughout this
supply voltage range. Quiescent current and short-circuit
current vs supply voltage are shown in Typical Performance
Curves.
Operation at very low supply voltage (VS ≤ ±3V) requires
careful attention to ensure that the common-mode voltage
remains within the linear range, VCM = (V–)+3V to (V+).
Inputs may need to be biased above ground in accordance
with the common-mode voltage range restrictions for linear
operation.
INPUT VOLTAGE
The input common-mode voltage range of OPA137 series
op amps extends from (V–)+3V to the positive rail, V+. For
normal operation, inputs should be limited to this range. The
inputs may go beyond the power supplies without output
phase-reversal. Many FET-input op amps (such as TL061
types) exhibit phase-reversal of the output when the input
common-mode range is exceeded. This can occur in voltage-
follower circuits, causing serious problems in control loop
applications.
Input terminals are diode-clamped to the power supply rails
for ESD protection. If the input voltage can exceed the
negative supply by 500mV, input current should be limited
to 2mA (or less). If the input current is not adequately
limited, you may see unpredicatable behavior in the other
amplifiers in the package. This is easily accomplished with
an input resistor as shown in Figure 1. Many input signals
are inherently current-limited, therefore, a limiting resistor
may not be required.
HIGH-SIDE CURRENT SENSING
Many applications require the sensing of signals near the
positive supply. The common-mode input range of OPA137
op amps includes the positive rail, enabling them to be used
to sense power supply currents as shown in Figure 2.
R1
0.1
V+
R2
1k
Load
Zetex
Darlington
ZTX712
OPA137
20pF
VO =
R1 R3
R2
IL
R3
10k
OPA241
VO
Ground-referred
output
FIGURE 2. High-Side Current Monitor.
INPUT BIAS CURRENT
The input bias current is approximately 5pA at room tem-
perature and increases with temperature as shown in the
typical performance curve “Input Bias Current vs Tempera-
ture.”
Input Bias current also varies with common-mode voltage
and power supply voltage. This variation is dependent on
the voltage between the negative power supply and the
common-mode input voltage. The effect is shown in the
typical performance curve “Input Bias Current vs Common-
Mode Voltage.”
RF
1M
3.3pF
IOVERLOAD
2mA max
VIN
V+
OPA137
Inputs are internally
clamped to V+ and V–
V–
VOUT
FIGURE 1. Input Current Protection for Voltages Exceed-
ing the Supply Voltage.
ID
λ
Photodiode
BPW34
CD = 75pF
OPA137
VO = – RF ID
ID is proportional to
light intensity (radiant power)
FIGURE 3. Photodetector Amplifier.
7 OPA137, 2137, 4137
®

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