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to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
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Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s
technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA
Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended
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is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
FAN4931
Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier
Features
Description
200 µA Supply Current per Amplifier
FAN4931 is an ultra-low cost voltage feedback amplifier
with CMOS inputs that consumes only 200 µA of supply
current, while providing ±33 mA of output short-circuit
current. This amplifier is designed to operate from 2.5 V
to 5 V supplies. The common-mode voltage range
extends beyond the negative and positive rails.
Fully Specified at +2.7 V and +5 V Supplies
3.7 MHz Bandwidth
Output Swing to within 10 mV of Either Rail
Input Voltage Range Exceeds the Rails
3 V/µs Slew Rate
25 nV/√Hz Input Voltage Noise
FAN4931 Competes with LMV931; Available in
SC70-5 Package
Applications
The FAN4931 is designed on a CMOS process and
provides 3.7 MHz of bandwidth and 3 V / μs of slew rate
at a supply voltage of 5 V. This amplifier operates and is
reliable over a wide temperature range -40°C to
+125°C. The combination of extended temperature
operation, low power, rail-to-rail performance, low
voltage operation,and tiny package optimizes this
amplifier for use in many industrial, general purpose and
battery powered applications.
Motor Control
Portable / Battery-Powered Applications
PCMCIA, USB
Mobile Communications, Cellular Phones, Pagers
Notebooks and PDAs
Sensor Interface
A/D Buffer
Active Filters
Signal Conditioning
Portable Test Instruments
Figure 1. Frequency vs. Gain
Ordering Information
Part Number
Operating Temperature Range
Package
Packing Method
FAN4931IP5X
-40 to +125°C
5-Lead SC70 Package
Tape and Reel (3000)
© 2008 Fairchild Semiconductor Corporation
FAN4931 • Rev. 1.0.2
www.fairchildsemi.com
FAN4931 — Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier
February 2013
Figure 2. Typical Application
Pin Configurations
FAN4931 — Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier
Typical Application
Figure 3. Pin Assignments
Pin Assignments
Pin #
Name
Description
1
+IN
Positive Input
2
-VS
Negative Supply
3
-IN
Negative Input
4
VOUT
Output
5
+VS
Positive Supply
© 2008 Fairchild Semiconductor Corporation
FAN4931 • Rev. 1.0.2
www.fairchildsemi.com
2
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable
above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition,
extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute
maximum ratings are stress ratings only. Functional operation under any of these conditions is NOT implied.
Performance and reliability are guaranteed only if operating conditions are not exceeded.
Symbol
Parameter
VCC
Supply Voltage
VIN
Input Voltage Range
TJ
Junction Temperature
TSTG
Storage Temperature
TL
ΘJA
ESD
Min.
Max.
Unit
0
6
V
-VS-0.5
+VS+0.5
V
+150
°C
-65
+150
°C
+300
°C
331
°C/W
Lead Soldering, 10 Seconds
Thermal Resistance
(1)
Electrostatic Discharge Capability
Human Body Model,
JESD22-A114
5
Charged Device Model,
JESD22-C101
2
kV
Note:
1.
Package thermal resistance JEDEC standard, multi-layer test boards, still air.
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
Parameter
Min.
Max.
Unit
+VS
Supply Voltage
2.30
5.25
V
TA
Operating Temperature Range
-40
+125
°C
© 2008 Fairchild Semiconductor Corporation
FAN4931 • Rev. 1.0.2
FAN4931 — Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier
Absolute Maximum Ratings
www.fairchildsemi.com
3
VS=+2.7 V, G=2, RL=10 kΩ to VS/2, RF=5 kΩ; unless otherwise noted.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
Frequency Domain Response
UGBW
BWSS
GBWP
G=+1
-3dB Bandwidth
Gain Bandwidth Product
4.0
MHz
2.5
MHz
4
MHz
Time Domain Response
tR, fF
Rise and Fall Time
VO=1.0 V Step
300
ns
OS
Overshoot
VO=1.0 V Step
5
%
SR
Slew Rate
VO=3 V Step, G=-1
3
V/µs
Distortion and Noise Response
HD2
2nd Harmonic Distortion
VO=1 VPP, 10 kHz
-66
dBc
HD3
3rd Harmonic Distortion
VO=1 VPP, 10 kHz
-67
dBc
THD
Total Harmonic Distortion
VO=1 VPP, 10 kHz
0.1
%
26
nV/√Hz
en
Input Voltage Noise
DC Performance
VIO
Input Offset Voltage(2)
dVIO
Average Drift
Ibn
PSRR
AOL
IS
-6
0
+6
mV
2.1
Input Bias Current
Power Supply Rejection Ratio(2)
DC
Open-Loop Gain
DC
50
(2)
Supply Current per Amplifier
µV/°C
5
pA
73
dB
98
dB
200
300
FAN4931 — Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier
Electrical Specifications at +2.7V
µA
Input Characteristics
RIN
Input Resistance
10
GΩ
CIN
Input Capacitance
1.4
pF
-0.3 to
2.8
V
50
65
dB
0.03
0.01 to
2.69
CMIR
Input Common Mode Voltage
Range
CMRR
Common Mode Rejection Ratio(2)
DC, VCM=OV to 2.2 V
Output Characteristics
RL=10 kΩ to VS/2
VO
Output Voltage Swing(2)
RL=1 kΩ to VS/2
ISC
Short-Circuit Output Current
VS
Power Supply Operating Range
0.05 to
2.55
2.65
V
+34/-12
mA
2.5 to
5.5
V
Note:
2. 100% tested at TA=25°C.
© 2008 Fairchild Semiconductor Corporation
FAN4931 • Rev. 1.0.2
www.fairchildsemi.com
4
VS=+5 V, G=2, RL=10 kΩ to VS/2, RF= 5 kΩ; unless otherwise noted.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
Frequency Domain Response
UGBW
BWSS
GBWP
G=+1
-3dB Bandwidth
Gain Bandwidth Product
3.7
MHz
2.3
MHz
3.7
MHz
Time Domain Response
tR, fF
Rise and Fall Time
VO=1.0 V Step
300
ns
OS
Overshoot
VO=1.0 V Step
5
%
SR
Slew Rate
VO=3 V Step, G=-1
3
V/µs
VO=1 VPP, 10 kHz
-80
dBc
Distortion and Noise Response
HD2
2nd Harmonic Distortion
HD3
3rd Harmonic Distortion
VO=1 VPP, 10 kHz
-80
dBc
THD
Total Harmonic Distortion
VO=1 VPP, 10 kHz
0.02
%
25
nV/√Hz
en
Input Voltage Noise
DC Performance
VIO
Input Offset Voltage(3)
dVIO
Average Drift
Ibn
PSRR
AOL
IS
-8
Input Bias Current
Power Supply Rejection Ratio
(3)
Open-Loop Gain
DC
50
DC
0
+8
mV
2.9
µV/°C
5
pA
73
dB
102
Supply Current per Amplifier(3)
200
dB
300
FAN4931 — Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier
Electrical Specifications at +5V
µA
Input Characteristics
RIN
CIN
CMIR
CMRR
Input Resistance
Input Capacitance
Input Common Mode Voltage
Range
Common Mode Rejection Ratio
DC, VCM=0 V to VS
GΩ
1.2
pF
-0.3 to
5.1
V
58
73
dB
0.03
0.01 to
4.99
Typical
(3)
10
Output Characteristics
RL=10 kΩ to VS/2
VO
(3)
Output Voltage Swing
RL=1 kΩ to VS/2
ISC
VS
Short-Circuit Output Current
Power Supply Operating Range
0.1 to
4.9
4.95
V
±33
mA
2.5 to
5.5
V
Note:
3. 100% tested at TA=25°C.
© 2008 Fairchild Semiconductor Corporation
FAN4931 • Rev. 1.0.2
www.fairchildsemi.com
5
VS=+2.7, G=2, RL=10 kΩ to VS/2, RF=5 kΩ; unless otherwise noted.
Figure 4. Non-Inverting Frequency Response (+5)
Figure 5. Inverting Frequency Response (+5 V)
Figure 6. Non-Inverting Frequency Response
Figure 7. Inverting Frequency Response
Figure 8. Frequency Response vs. CL
Figure 9. Frequency Response vs. RL
Figure 10. Large Signal Frequency Response (+5 V)
Figure 11. Open-Loop Gain and Phase vs. Frequency
© 2008 Fairchild Semiconductor Corporation
FAN4931 • Rev. 1.0.2
FAN4931 — Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier
Typical Performance Characteristics
www.fairchildsemi.com
6
VS=+2.7, G=2, RL=10 kΩ to VS/2, RF=5 kΩ; unless otherwise noted.
Figure 12. 2nd and 3rd Harmonic Distortion
Figure 13. 2nd Harmonic Distortion vs. VO
Figure 14. 3rd Harmonic Distortion vs. VO
Figure 15. CMRR VS=5 V
Figure 16. PSRR VS=5 V
Figure 17. Output Swing vs. Load
Figure 18. Pulse Response vs. Common-Mode
Voltage
Figure 19. Input Voltage Noise
© 2008 Fairchild Semiconductor Corporation
FAN4931 • Rev. 1.0.2
FAN4931 — Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier
Typical Performance Characteristic
www.fairchildsemi.com
7
General Description
Overdrive Recovery
The FAN4931 amplifier is a single-supply, generalpurpose, voltage-feedback amplifier, fabricated on a biCMOS process. It features a rail-to-rail input and output
and is unity gain stable. The typical non-inverting circuit
schematic is shown in Figure 20.
Overdrive of an amplifier occurs when the output and/or
input ranges are exceeded. The recovery time varies
based on whether the input or output is overdriven and
by how much the range is exceeded. The FAN4931
typically recovers in less than 500 ns from an overdrive
condition. Figure 22 shows the FAN4931 amplifier in an
overdriven condition.
Figure 20. Typical Non-Inverting Configuration
Figure 22. Overdrive Recovery
Input Common-Mode Voltage
Driving Capacitive Loads
The common-mode input range extends to 300 mV below
ground and to 100 mV above VS in single-supply
operation. Exceeding these values does not cause phase
reversal; however, if the input voltage exceeds the rails
by more than 0.5 V, the input ESD devices begin to
conduct. The output stays at the rail during this overdrive
condition. If the absolute maximum input VIN (700 mV
beyond either rail) is exceeded, externally limit the input
current to ±5 mA, as shown in Figure 21.
Figure 8 illustrates the response of the amplifier. A small
series resistance (RS) at the output, illustrated in Figure
23, improves stability and settling performance. RS values
in Figure 8 were chosen to achieve maximum bandwidth
with less than 2 dB of peaking. For maximum flatness,
use a larger RS. Capacitive loads larger than 500 pF
require the use of RS.
Figure 23. Typical Topology for Driving a
Capacitive Load
Figure 21. Circuit for Input Current Protection
Power Dissipation
Driving a capacitive load introduces phase-lag into the
output signal, which reduces phase margin in the
amplifier. The unity gain follower is the most sensitive
configuration. In a unity gain follower configuration, the
amplifier requires a 300 Ω−series resistor to drive a
100 pF load.
The maximum internal power dissipation allowed is
directly related to the maximum junction temperature. If
the maximum junction temperature exceeds 150°C,
performance degradation occurs. If the maximum junction
temperature exceeds 150°C for an extended time, device
failure may occur.
© 2008 Fairchild Semiconductor Corporation
FAN4931 • Rev. 1.0.2
FAN4931 — Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier
Application Information
www.fairchildsemi.com
8
General layout and supply bypassing play major roles in
high-frequency performance. Fairchild evaluation boards
help guide high-frequency layout and aid in device testing
and characterization. Follow the steps below as a basis
for high-frequency layout:
Evaluation Board Information
The following evaluation board is available to aid in the
testing and layout of this device.
Include 6.8 μF and 0.01 μF ceramic capacitors.
Place the 6.8 μF capacitor within 0.75 inches of the
power pin.
Place the 0.01 μF capacitor within 0.1 inches of the
power pin.
Evaluation
Board
Description
Products
FAN4931-011
Single-Channel,
Dual-Supply,
5 -Lead SC70
FAN4931IP5X
Evaluation board schematics are shown in Figure 24;
layouts are shown in Figure 25-Figure 26.
Remove the ground plane under and around the part,
especially near the input and output pins, to reduce
parasitic capacitance.
Minimize all trace lengths to reduce series inductances.
Refer to the evaluation board layouts shown in Figure 24Figure 26 for more information.
When evaluating only one channel, complete the
following on the unused channel:
Ground the non-inverting input.
Short the output to the inverting input.
FAN4931 — Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier
Layout Considerations
Figure 24. Evaluation Board Schematic
Board Layout Information
Figure 25. Top Side
© 2008 Fairchild Semiconductor Corporation
FAN4931 • Rev. 1.0.2
Figure 26. Bottom Side
www.fairchildsemi.com
9
FAN4931 — Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier
Physical Dimensions
Figure 27. 5-Lead SC70 Package
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in
any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor
representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s
worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products.
Always
visit
Fairchild Semiconductor’s
online packaging area for
the most
recent package drawings:
http://www.fairchildsemi.com/packaging/.
© 2008 Fairchild Semiconductor Corporation
FAN4931 • Rev. 1.0.2
www.fairchildsemi.com
10
FAN4931 — Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier
© 2008 Fairchild Semiconductor Corporation
FAN4931 • Rev. 1.0.2
www.fairchildsemi.com
11
ON Semiconductor and
are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.
ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent
coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.
ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,
regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer
application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not
designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification
in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized
application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and
expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such
claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This
literature is subject to all applicable copyright laws and is not for resale in any manner.
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