OPA37G [BB]
Ultra-Low Noise Precision OPERATIONAL AMPLIFIERS; 超低噪声精密运算放大器
| 型号： | OPA37G |
| 厂家： | 
BURR-BROWN CORPORATION |
| 描述： | Ultra-Low Noise Precision OPERATIONAL AMPLIFIERS |
| 文件： | 总13页 (文件大小：219K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
OPA27
OPA37
OPA27
OPA27
Ultra-Low Noise Precision
OPERATIONAL AMPLIFIERS
FEATURES
APPLICATIONS
● LOW NOISE: 4.5nV/√Hz max at 1kHz
● PRECISION INSTRUMENTATION
● LOW OFFSET: 100µV max
● DATA ACQUISITION
● LOW DRIFT: 0.4µV/°C
● TEST EQUIPMENT
● HIGH OPEN-LOOP GAIN: 117dB min
● PROFESSIONAL AUDIO EQUIPMENT
● TRANSDUCER AMPLIFIER
● RADIATION HARD EQUIPMENT
● HIGH COMMON-MODE REJECTION:
100dB min
● HIGH POWER SUPPLY REJECTION:
94dB min
● FITS OP-07, OP-05, AD510, AD517
SOCKETS
7
+VCC
DESCRIPTION
The OPA27/37 is an ultra-low noise, high precision
monolithic operational amplifier.
8
Trim
1
Laser-trimmed thin-film resistors provide excellent
long-term voltage offset stability and allow superior
voltage offset compared to common zener-zap tech-
niques.
Trim
6
Output
A unique bias current cancellation circuit allows bias
and offset current specifications to be met over the full
–55°C to +125°C temperature range.
2
3
The OPA27 is internally compensated for unity-gain
stability. The decompensated OPA37 requires a closed-
loop gain ≥ 5.
–In
+In
The Burr-Brown OPA27/37 is an improved replace-
ment for the industry-standard OP-27/OP-37.
4
–VCC
International Airport Industrial Park
•
Mailing Address: PO Box 11400, Tucson, AZ 85734
FAXLine: (800) 548-6133 (US/Canada Only)
• 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
© 1984 Burr-Brown Corporation
PDS-466M
Printed in U.S.A. March, 1998
SPECIFICATIONS
At VCC = ±15V and TA = +25°C, unless otherwise noted.
OPA27/37G
TYP
PARAMETER
CONDITIONS
MIN
MAX
UNITS
INPUT NOISE(6)
Voltage, fO = 10Hz
3.8
3.3
3.2
0.09
1.7
1.0
0.4
8.0
5.6
4.5
nV/√Hz
nV/√Hz
nV/√Hz
µVp-p
pA/√Hz
pA/√Hz
pA/√Hz
f
O = 30Hz
O = 1kHz
B = 0.1Hz to 10Hz
Current,(1) fO = 10Hz
f
f
0.25
f
f
O = 30Hz
O = 1kHz
0.6
OFFSET VOLTAGE(2)
Input Offset Voltage
Average Drift(3)
±25
±0.4
0.4
±100
±1.8 (6)
2.0
µV
µV/°C
µV/mo
TA MIN to TA MAX
Long Term Stability(4)
Supply Rejection
±VCC = 4 to 18V
±VCC = 4 to 18V
94
120
±1
dB
µV/V
±20
±80
75
BIAS CURRENT
Input Bias Current
±15
10
nA
nA
OFFSET CURRENT
Input Offset Current
IMPEDANCE
Common-Mode
2 || 2.5
GΩ || pF
VOLTAGE RANGE
Common-Mode Input Range
Common-Mode Rejection
±11
100
±12.3
122
V
dB
VIN = ±11VDC
OPEN-LOOP VOLTAGE GAIN, DC
R
R
L ≥ 2kΩ
L ≥ 1kΩ
117
124
124
dB
dB
FREQUENCY RESPONSE
Gain-Bandwidth Product(5)
OPA27
OPA37
VO = ±10V,
5(6)
45 (6)
8
63
MHz
MHz
Slew Rate (5)
R
L = 2kΩ
OPA27, G = +1
OPA37, G = +5
OPA27, G = +1
OPA37, G = +5
1.7(6)
11(6)
1.9
11.9
25
V/µs
V/µs
µs
Settling Time, 0.01%
25
µs
RATED OUTPUT
Voltage Output
R
R
L ≥ 2kΩ
L ≥ 600Ω
DC, Open Loop
L = 0Ω
±12
±10
±13.8
±12.8
70
V
V
Ω
Output Resistance
Short Circuit Current
R
25
60(6)
mA
POWER SUPPLY
Rated Voltage
±15
VDC
Voltage Range,
Derated Performance
Current, Quiescent
±4
±22
5.7
VDC
mA
I
O = 0mADC
3.3
TEMPERATURE RANGE
Specification
Operating
–40
–40
+85
+85
°C
°C
NOTES: (1) Measured with industry-standard noise test circuit (Figures 1 and 2). Due to errors introduced by this method, these current noise specifications should
be used for comparison purposes only. (2) Offset voltage specification are measured with automatic test equipment after approximately 0.5 seconds from power turn-
on. (3) Unnulled or nulled with 8kΩ to 20kΩ potentiometer. (4) Long-term voltage offset vs time trend line does not include warm-up drift. (5) Typical specification only
on plastic package units. Slew rate varies on all units due to differing test methods. Minimum specification applies to open-loop test. (6) This parameter guaranteed by
design.
®
2
OPA27, 37
SPECIFICATIONS
At VCC = ±15V and TA = +25°C, unless otherwise noted.
OPA27/37G
TYP
PARAMETER
CONDITIONS
MIN
MAX
UNITS
INPUT VOLTAGE(1)
Input Offset Voltage
Average Drift(2)
±48
±0.4
±220(3)
±1.8(3)
µV
µV/°C
TA MIN to TA MAX
±VCC = 4.5 to 18V
±VCC = 4.5 to 18V
Supply Rejection
90 (3)
122
dB
nA
BIAS CURRENT
Input Bias Current
±21
±150(3)
OFFSET CURRENT
Input Offset Current
E, F, G
20
135(3)
nA
VOLTAGE RANGE
Common-Mode Input Range
Common-Mode Rejection
±10.5(3)
96(3)
±11.8
V
VIN = ±11VDC
122
dB
OPEN-LOOP GAIN, DC
Open-Loop Voltage Gain
RL ≥ 2kΩ
113(3)
120
dB
RATED OUTPUT
Voltage Output
Short Circuit Current
RL = 2kΩ
O = 0VDC
±11.0(3)
±13.4
25
V
mA
V
TEMPERATURE RANGE
Specification
–40
+85
°C
NOTES: (1) Offset voltage specification are measured with automatic test equipment after approximately 0.5s from power turn-on. (2) Unnulled or nulled with 8kΩ to
20kΩ potentiometer. (3) This parameter guaranteed by design.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage................................................................................... ±22V
Internal Power Dissipation (1) ........................................................ 500mW
Input Voltage...................................................................................... ±VCC
Output Short-Circuit Duration (2) ................................................. Indefinite
Differential Input Voltage (3) ............................................................. ±0.7V
Differential Input Current (3) ........................................................... ±25mA
Storage Temperature Range .......................................... –55°C to +125°C
Operating Temperature Range .........................................–40°C to +85°C
Lead Temperature:
PACKAGE TYPE
θJA
UNITS
8-Pin Plastic DIP (P)
8-Pin SOIC (U)
100
160
°C/W
°C/W
NOTES: (1) Maximum package power dissipation vs ambient temperature. (2) To
common with ±VCC = 15V. (3) The inputs are protected by back-to-back diodes.
Current limiting resistors are not used in order to achieve low noise. If differential
input voltage exceeds ±0.7V, the input current should be limited to 25mA.
P (soldering, 10s) ....................................................................... +300°C
U (soldering, 3s) ......................................................................... +260°C
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 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.
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.
®
3
OPA27, 37
CONNECTION DIAGRAMS
PACKAGE/ORDERING INFORMATION
OFFSET
PACKAGE
DRAWING
NUMBER(3)
Top View
P, U Packages
TEMPERATURE
RANGE ( C)
VOLTAGE
MAX ( V), 25°C
PRODUCT(1) PACKAGE
°
µ
OPA27GP
Plastic
SOIC
–40 to +85
–40 to +85
±100
±100
006
182
Offset Trim
1
2
3
4
8
7
6
5
OPA27GU(2)
Offset Trim
+VCC
NOTE: (1) Packages for OPA37 are same as for OPA27. (2) OPA27GU may
be marked OPA27U. Likewise, OPA37GU may be marked OPA37U. (3) For
detailed drawing and dimension table, please see end of data sheet, or
Appendix C of Burr-Brown IC Data Book.
–In
+In
Output
NC
–VCC
0.1µF
100kΩ
10Ω
2kΩ
22µF
DUT
4.3kΩ
OPA111
4.7µF
Scope
x1
RIN = 1MΩ
Voltage Gain
Total = 50,000
2.2µF
100kΩ
110kΩ
0.1µF
24.3kΩ
NOTE: All capacitor values are for nonpolarized capacitors only.
FIGURE 1. 0.1Hz to 10Hz Noise Test Circuit.
0.1Hz TO 10Hz NOISE
1s/div 40nV/div
FIGURE 2. Low Frequency Noise.
®
4
OPA27, 37
TYPICAL PERFORMANCE CURVES
At TA = +25°C, ±VCC = ±15VDC, unless otherwise noted.
INPUT OFFSET VOLTAGE CHANGE
DUE TO THERMAL SHOCK
INPUT OFFSET VOLTAGE WARM-UP DRIFT
+10
+20
+10
0
+5
G
TA = +25°C to TA = +70°C
Fluid Bath
+25°C +70°C
0
–5
–10
–20
TO-99
–10
0
100
0
1
2
3
4
5
6
–1
0
+1
+2
+3
+4
+5
Time From Power Turn-On (min)
Time From Thermal Shock (min)
INPUT VOLTAGE NOISE vs NOISE BANDWIDTH
(0.1Hz to Indicated Frequency)
TOTAL INPUT VOLTAGE NOISE SPECTRAL DENSITY
vs SOURCE RESISTANCE
100
80
10
1
60
R1
-
40
20
+
R1
RSOURCE = 2 x R1
10
8
6
10Hz
1kHz
0.1
0.01
4
2
1
Resistor Noise Only
RS = 0 Ω
1k
10k
100k
100
1k
Source Resistance (Ω)
10k
Noise Bandwidth (Hz)
VOLTAGE NOISE SPECTRAL DENSITY
vs SUPPLY VOLTAGE
VOLTAGE NOISE SPECTRAL DENSITY
vs TEMPERATURE
5
4
3
2
1
5
4
3
2
1
10Hz
10Hz
1kHz
1kHz
–75
–50
–25
0
+25
+50
+75 +100 +125
±5
±10
±15
±20
Ambient Temperature (°C)
Supply Voltage (VCC
)
®
5
OPA27, 37
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, ±VCC = ±15VDC, unless otherwise noted.
INPUT VOLTAGE NOISE SPECTRAL DENSITY
INPUT CURRENT NOISE SPECTRAL DENSITY
10
8
6
10
8
Current Noise Test Circuit
4
2
10kΩ
100kΩ 500kΩ
eno
DUT
6
500kΩ
1
0.8
0.6
2
In
=
√(eno
)
– (130nV)2
4
1MΩ x 100
0.4
0.2
0.1
Warning: This industry-standard equation
is inaccurate and these figures should
be used for comparison purposes only!
2
0
1
10
100
1k
10
10
10
100
Frequency (Hz)
1k
10k
Frequency (Hz)
OPEN-LOOP FREQUENCY RESPONSE
BIAS AND OFFSET CURRENT vs TEMPERATURE
Bias
140
120
100
80
20
15
10
5
20
15
10
5
OPA37
OPA27
Offset
60
40
20
0
0
0
100
1k
10k
100k
1M
10M
100M
–75
–50
–25
0
+25
+50
+75 +100 +125
Ambient Temperature (°C)
Frequency (Hz)
OPA27 CLOSED-LOOP VOLTAGE GAIN AND
PHASE SHIFT vs FREQUENCY (G = 100)
OPA37 CLOSED-LOOP VOLTAGE GAIN AND
PHASE SHIFT vs FREQUENCY (G = 100)
50
40
50
40
0
0
30
–45
30
–45
–90
–135
–180
–225
Ø
20
–90
20
G = 5
Gain
10
–135
–180
–225
10
Gain
0
0
–10
–20
–10
–20
100
1k
10k
100k
1M
10M
100M
10
100
1k
10k
100k
1M
10M
100M
Frequency (Hz)
Frequency (Hz)
®
6
OPA27, 37
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, ±VCC = ±15VDC, unless otherwise noted.
COMMON-MODE REJECTION vs FREQUENCY
POWER SUPPLY REJECTION vs FREQUENCY
OPA27
140
120
100
80
140
120
100
80
–VCC
OPA37
+VCC
60
60
OPA27
40
40
20
20
0
0
1
±5
0
10
100
1k
10k
100k
1M
10M
±25
±20
1
–75
0
10
100
1k
10k
100k
1M
10M
Frequency (Hz)
Frequency (Hz)
OPEN-LOOP VOLTAGE GAIN vs TEMPERATURE
OPEN-LOOP VOLTAGE GAIN vs SUPPLY VOLTAGE
130
125
120
115
135
130
125
120
115
RL = 2kΩ
RL = 600Ω
RL = 2kΩ
–50
–25
0
+25
+50
+75 +100 +125
±10
±15
±20
Ambient Temperature (°C)
Supply Voltage (VCC
)
COMMON-MODE INPUT VOLTAGE RANGE
vs SUPPLY VOLTAGE
SUPPLY CURRENT vs SUPPLY VOLTAGE
6
5
4
3
2
1
0
+15
+10
+5
TA = –55°C
TA = +25°C
TA = +125°C
TA = –55°C
TA = +25°C
TA = +125°C
+125°C
+25°C
–55°C
0
–5
–10
–15
±5
±10
±15
±5
±10
±15
±20
Supply Voltage (VCC
)
Supply Voltage (VCC )
®
7
OPA27, 37
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, ±VCC = ±15VDC, unless otherwise noted.
OPA27 SMALL SIGNAL TRANSIENT RESPONSE
OPA37 SMALL SIGNAL TRANSIENT RESPONSE
+60
+40
+20
0
+60
+40
+20
0
–20
–40
–60
–20
–40
–60
AVCL = +1
CL = 15pF
AV = +5
CL = 25pF
0
0.5
1.5
2.5
0
0.2
0.4
0.6
0.8
1.0
1.2
1
2
Time (µs)
Time (µs)
OPA27 LARGE SIGNAL TRANSIENT RESPONSE
OPA37 LARGE SIGNAL TRANSIENT RESPONSE
+6
+4
+2
0
+15
+10
+5
0
–2
–4
–6
–5
AVCL = +1
AV = +5
–10
–15
0
2
4
6
8
10
12
0
1
2
3
4
5
6
Time (µs)
Time (µs)
APPLICATIONS INFORMATION
OFFSET VOLTAGE ADJUSTMENT
THERMOELECTRIC POTENTIALS
The OPA27/37 offset voltage is laser-trimmed and will re-
quire no further trim for most applications. Offset voltage
drift will not be degraded when the input offset is nulled with
a 10kΩ trim potentiometer. Other potentiometer values from
1kΩ to 1MΩ can be used but VOS drift will be degraded by
an additional 0.1 to 0.2µV/°C. Nulling large system offsets
by use of the offset trim adjust will degrade drift performance
by approximately 3.3µV/°C per millivolt of offset. Large
system offsets can be nulled without drift degradation by
input summing.
The OPA27/37 is laser-trimmed to microvolt-level input
offset voltage and for very low input offset voltage drift.
Careful layout and circuit design techniques are necessary to
prevent offset and drift errors from external thermoelectric
potentials. Dissimilar metal junctions can generate small
EMFs if care is not taken to eliminate either their sources
(lead-to-PC, wiring, etc.) or their temperature difference. See
Figure 11.
Short, direct mounting of the OPA27/37 with close spacing
of the input pins is highly recommended. Poor layout can
result in circuit drifts and offsets which are an order of
magnitude greater than the operational amplifier alone.
The conventional offset voltage trim circuit is shown in
Figure 3. For trimming very small offsets, the higher resolu-
tion circuit shown in Figure 4 is recommended.
The OPA27/37 can replace 741-type operational amplifiers
by removing or modifying the trim circuit.
®
8
OPA27, 37
NOISE: BIPOLAR VERSUS FET
COMPENSATION
Low-noise circuit design requires careful analysis of all noise
sources. External noise sources can dominate in many cases,
so consider the effect of source resistance on overall opera-
tional amplifier noise performance. At low source imped-
ances, the lower voltage noise of a bipolar operational
amplifier is superior, but at higher impedances the high
current noise of a bipolar amplifier becomes a serious liabil-
ity. Above about 15kΩ the Burr-Brown OPA111 low-noise
FET operational amplifier is recommended for lower total
noise than the OPA27 (see Figure 5).
Although internally compensated for unity-gain stability, the
OPA27 may require a small capacitor in parallel with a
feedback resistor (RF) which is greater than 2kΩ. This
capacitor will compensate the pole generated by RF and CIN
and eliminate peaking or oscillation.
INPUT PROTECTION
Back-to-back diodes are used for input protection on the
OPA27/37. Exceeding a few hundred millivolts differential
input signal will cause current to flow and without external
current limiting resistors the input will be destroyed.
+VCC
Accidental static discharge as well as high current can
damage the amplifier’s input circuit. Although the unit may
still be functional, important parameters such as input offset
voltage, drift, and noise may be permanently damaged as will
any precision operational amplifier subjected to this abuse.
(1)
NOTE: (1) 10kΩ to 1MΩ
Trim Potentiometer
(10kΩ Recommended).
7
8
2
1
Transient conditions can cause feedthrough due to the
amplifier’s finite slew rate. When using the OP-27 as a unity-
gain buffer (follower) a feedback resistor of 1kΩ is recom-
mended (see Figure 6).
6
OPA27/37
3
4
±4mV Typical Trim Range
–V
CC
RF
≈ 1kΩ
FIGURE 3. Offset Voltage Trim.
+VCC
–
OPA27
Output
(1)
+
NOTE: (1) 1kΩ Trim Potentiometer.
Input
1.9V/µs
4.7kΩ
4.7kΩ
7
8
2
3
1
6
FIGURE 6. Pulsed Operation.
OPA27/37
7.87kΩ
G ≈ 40dB at 1kHz.
Metal film resistors.
Film capacitors.
RL and CL per cartridge
manufacturer’s
4
±280µV Typical Trim Range
–V
CC
0.01µF 0.03µF
FIGURE 4. High Resolution Offset Voltage Trim.
97.6kΩ
recommendations.
100Ω
2
1µF
1k
Output
6
OPA27 + Resistor
OPA37
3
EO
OPA111 + Resistor
Moving
Magnet
20kΩ
RL
CL
RS
100
Cartridge
OPA111 + Resistor
Resistor Noise Only
FIGURE 7. Low-Noise RIAA Preamplifier.
10
Resistor Noise Only
OPA27 + Resistor
1kΩ
1
100
1kΩ
2
1k
10k
100k
1M
10M
Input
6
Source Resistance, RS (Ω)
Output
OPA27
3
EO = √en2 + (inRS)2 + 4kTRS
FO = 1kHz
FIGURE 8. Unity-Gain Inverting Amplifier.
FIGURE 5. Voltage Noise Spectral Density Versus Source
Resistance.
®
9
OPA27, 37
G ≈ 50dB at 1kHz.
Metal film resistors.
Film capacitors.
RL and CL per head
manufacturer’s
4.99kΩ 0.01µF
316kΩ
1kΩ
recommendations.
1kΩ
2
3
100Ω
2
Input
1µF
6
Output
Output
6
OPA37
OPA37
250Ω
3
500pF
20kΩ
RL
CL
Magnetic Tape Head
FIGURE 10. NAB Tape Head Preamplifier.
FIGURE 9. High Slew Rate Unity-Gain Inverting Amplifier.
Total Gain = 106
10kΩ
10Ω
10Hz Low-
Pass Filter
Chart
Recorder
10mV/mm
5mm/s
DUT
G =1k
Offset
A. 741 noise with circuit well-shielded from air
currents and RFI. (Note scale change.)
5µV
B. OP-07AH with circuit well-shielded from air
currents and RFI.
0.5µV
0.5µV
0.5µV
0.5µV
C. OPA27AJ with circuit well-shielded from air
currents and RFI. (Represents ultimate
OPA27 performance potential.)
D. OPA27 with circuit unshielded and exposed
to normal lab bench-top air currents.
(External thermoelectric potentials far
exceed OPA27 noise.)
E. OPA27 with heat sink and shield which
protects input leads from air currents.
Conditions same as (D).
FIGURE 11. Low Frequency Noise Comparison.
®
10
OPA27, 37
3
2
Gain = 100
For gain = 1000 use INA106 differential amplifier.
–In
6
Bandwidth ≈ 500kHz
OPA37
Burr-Brown INA105
Differential Amplifier
RF
5kΩ
25kΩ
25kΩ
2
3
5
6
RG
101Ω
Input Stage Gain = 1 + 2RF/RG
RF
5kΩ
25kΩ
Output
2
25kΩ
6
OPA37
3
+In
1
FIGURE 12. Low Noise Instrumentation Amplifier.
1kΩ
0.1µF
200Ω
2
100Ω
100kΩ
0.1µF
Output
6
500pF
OPA37
3
2
3
2kΩ
Output
6
1MΩ
OPA27
EDO 6166
Transducer
NOTE: Use metal film resistors
and plastic film capacitor. Circuit
must be well shielded to achieve
low noise.
Frequency Response
≈ 1kHz to 50kHz
Dexter 1M
Thermopile
Detector
FIGURE 13. Hydrophone Preamplifier.
Responsivity ≈ 2.5 x 104V/W
Output Noise ≈ 30µVrms, 0.1Hz to 10Hz
20pF
FIGURE 14. Long-Wavelength Infrared Detector Amplifier.
TTL INPUT GAIN
9.76kΩ
“1”
“0”
+1
–1
Balance
Trim
500Ω
10kΩ
Input
2
3
Output
6
8
4.99kΩ
OPA27
D1
D2
S1
S2
1
4.75kΩ
4.75kΩ
1kΩ
TTL
In
DG188
Offset
Trim
+VCC
FIGURE 15. High Performance Synchronous Demodulator.
®
11
OPA27, 37
Gain = –1010V/V
Full Power Bandwidth ≈ 180kHz
Gain Bandwidth ≈ 500MHz
Equivalent Noise Resistance ≈ 50Ω
Input
20Ω
20Ω
20Ω
20Ω
20Ω
2kΩ
Signal-to-Noise Ratio √N
since amplifier noise is
uncorrelated.
2
3
2kΩ
2kΩ
2kΩ
2kΩ
2kΩ
6
6
6
6
6
OPA37
2kΩ
2
3
OPA37
2kΩ
2kΩ
2
3
2
6
OPA37
OPA37
3
Output
2kΩ
2
3
OPA37
2kΩ
2
3
OPA37
N = 10 Each OPA37EZ
FIGURE 16. Ultra-Low Noise “N” Stage Parallel Amplifier.
®
12
OPA27, 37
5V
5V
+10V
0V
+10V
0V
–10V
–10V
5µs
RS = 50Ω
5µs
1kΩ
RS = 50Ω
1kΩ
2
6
2
3
Output
OPA37
3
6
250Ω
Output
OPA27
Input
500pF
Input
FIGURE 18. High Slew Rate Unity-Gain Buffer.
FIGURE 17. Unity-Gain Buffer.
+15V
10µF/20V
+
100Ω
10kΩ
200Ω
20kΩ
1
2
3
VIRTEC V1000
Planar Tunnel
Diode
2
100µF/20V
Tantalum
50Ω
Input
6
6
OPA27
0.01µF
OPA37
2
3
Output
Video
Output
+
10kΩ
10kΩ
RFC
200Ω
500pF
3
Siemens LHI 948
FIGURE 19. RF Detector and Video Amplifier.
FIGURE 20. Balanced Pyroelectric Infrared Detector.
4.8V
+
1kΩ
2
6
0
OPA27
Airpax
Magnetic
Pickup
3
Output
–
fOUT RPM X N
Where N = Number of Gear Teeth
FIGURE 21. Magnetic Tachometer.
®
13
OPA27, 37
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