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February 2013

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.

3.7 MHz Bandwidth

Output Swing to within 10 mV of Either Rail

Input Voltage Range Exceeds the Rails

3 V/µs Slew Rate

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.

25 nV/√Hz Input Voltage Noise

FAN4931 Competes with LMV931; Available in

SC70-5 Package

.

Fully Specified at +2.7 V and +5 V Supplies

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

-40 to +125°C

FAN4931IP5X

5-Lead SC70 Package

Tape and Reel (3000)

FAN4931 • Rev. 1.0.2

www.fairchildsemi.com

Typical Application

Figure 2. Typical Application

Pin Configurations

Figure 3. Pin Assignments

Pin Assignments

Pin #

Name

+IN

Description

Positive Input

Negative Supply

Negative Input

Output

1

2

3

4

5

-V_S

-IN

V_OUT

+V_S

Positive Supply

FAN4931 • Rev. 1.0.2

www.fairchildsemi.com

2

Absolute Maximum Ratings

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

V_CC

V_IN

Parameter

Min.

0

Max.

6

Unit

V

Supply Voltage

Input Voltage Range

Junction Temperature

Storage Temperature

-V_S-0.5

+V_S+0.5

+150

+300

331

V

T_J

°C

T_STG

T_L

-65

°C

Lead Soldering, 10 Seconds

Thermal Resistance⁽¹⁾

°C

°C/W

Θ_JA

Human Body Model,

JESD22-A114

5

2

ESD

Electrostatic Discharge Capability

kV

Charged Device Model,

JESD22-C101

Note:

Package thermal resistance JEDEC standard, multi-layer test boards, still air.

1.

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.

2.30

-40

Max.

5.25

Unit

V

+VS

Supply Voltage

Operating Temperature Range

T_A

+125

°C

FAN4931 • Rev. 1.0.2

www.fairchildsemi.com

3

Electrical Specifications at +2.7V

V_S=+2.7 V, G=2, R_L=10 kΩ to V_S/2, R_F=5 kΩ; unless otherwise noted.

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Units

Frequency Domain Response

UGBW

G=+1

4.0

2.5

4

MHz

-3dB Bandwidth

BW_SS

GBWP

Gain Bandwidth Product

Time Domain Response

t_R, f_F

OS

Rise and Fall Time

V_O=1.0 V Step

300

5

ns

%

Overshoot

Slew Rate

V_O=1.0 V Step

SR

V_O=3 V Step, G=-1

3

V/µs

Distortion and Noise Response

HD2

2nd Harmonic Distortion

V_O=1 V_PP, 10 kHz

-66

-67

0.1

26

dBc

HD3

3rd Harmonic Distortion

Total Harmonic Distortion

Input Voltage Noise

THD

%

e_n

nV/√Hz

DC Performance

V_IO

dV_IO

I_bn

Input Offset Voltage⁽²⁾

-6

0

2.1

5

+6

mV

µV/°C

pA

Average Drift

Input Bias Current

PSRR

A_OL

I_S

Power Supply Rejection Ratio⁽²⁾

DC

50

73

98

200

dB

Open-Loop Gain

Supply Current per Amplifier⁽²⁾

dB

300

µA

Input Characteristics

R_IN

C_IN

Input Resistance

10

GΩ

Input Capacitance

1.4

pF

Input Common Mode Voltage

Range

-0.3 to

2.8

CMIR

V

CMRR

Common Mode Rejection Ratio⁽²⁾

DC, V_CM=OV to 2.2 V

50

65

dB

Output Characteristics

0.01 to

2.69

0.03

2.65

R_L=10 kΩ to V_S/2

R_L=1 kΩ to V_S/2

V_O

Output Voltage Swing⁽²⁾

V

0.05 to

2.55

I_SC

V_S

Short-Circuit Output Current

+34/-12

mA

V

2.5 to

5.5

Power Supply Operating Range

Note:

2. 100% tested at T_A=25°C.

FAN4931 • Rev. 1.0.2

www.fairchildsemi.com

4

Electrical Specifications at +5V

V_S=+5 V, G=2, R_L=10 kΩ to V_S/2, R_F= 5 kΩ; unless otherwise noted.

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Units

Frequency Domain Response

UGBW

G=+1

3.7

2.3

3.7

MHz

-3dB Bandwidth

BW_SS

GBWP

Gain Bandwidth Product

Time Domain Response

t_R, f_F

OS

Rise and Fall Time

V_O=1.0 V Step

300

5

ns

%

Overshoot

Slew Rate

V_O=1.0 V Step

SR

V_O=3 V Step, G=-1

3

V/µs

Distortion and Noise Response

HD2

2nd Harmonic Distortion

V_O=1 V_PP, 10 kHz

-80

0.02

25

dBc

HD3

3rd Harmonic Distortion

Total Harmonic Distortion

Input Voltage Noise

THD

%

e_n

nV/√Hz

DC Performance

V_IO

dV_IO

I_bn

Input Offset Voltage⁽³⁾

-8

0

+8

mV

µV/°C

pA

Average Drift

2.9

5

Input Bias Current

PSRR

A_OL

I_S

Power Supply Rejection Ratio⁽³⁾

DC

50

73

dB

Open-Loop Gain

Supply Current per Amplifier⁽³⁾

102

200

dB

300

µA

Input Characteristics

R_IN

C_IN

Input Resistance

10

GΩ

Input Capacitance

1.2

pF

Input Common Mode Voltage

Range

-0.3 to

5.1

CMIR

Typical

V

CMRR

Common Mode Rejection Ratio⁽³⁾

DC, V_CM=0 V to V_S

58

73

dB

Output Characteristics

0.01 to

4.99

0.03

4.95

R_L=10 kΩ to V_S/2

R_L=1 kΩ to V_S/2

V_O

Output Voltage Swing⁽³⁾

V

0.1 to

4.9

I_SC

V_S

Short-Circuit Output Current

±33

mA

V

2.5 to

5.5

Power Supply Operating Range

Note:

3. 100% tested at T_A=25°C.

FAN4931 • Rev. 1.0.2

www.fairchildsemi.com

5

Typical Performance Characteristics

V_S=+2.7, G=2, R_L=10 kΩ to V_S/2, R_F=5 kΩ; unless otherwise noted.

Figure 4. Non-Inverting Frequency Response (+5)

Figure 6. Non-Inverting Frequency Response

Figure 8. Frequency Response vs. C_L

Figure 5. Inverting Frequency Response (+5 V)

Figure 7. Inverting Frequency Response

Figure 9. Frequency Response vs. R_L

Figure 10. Large Signal Frequency Response (+5 V)

Figure 11. Open-Loop Gain and Phase vs. Frequency

FAN4931 • Rev. 1.0.2

www.fairchildsemi.com

6

Typical Performance Characteristic

V_S=+2.7, G=2, R_L=10 kΩ to V_S/2, R_F=5 kΩ; unless otherwise noted.

Figure 12. 2nd and 3rd Harmonic Distortion

Figure 14. 3rd Harmonic Distortion vs. V_O

Figure 16. PSRR V_S=5 V

Figure 13. 2nd Harmonic Distortion vs. V_O

Figure 15. CMRR V_S=5 V

Figure 17. Output Swing vs. Load

Figure 18. Pulse Response vs. Common-Mode

Voltage

Figure 19. Input Voltage Noise

www.fairchildsemi.com

FAN4931 • Rev. 1.0.2

7

Application Information

General Description

Overdrive Recovery

The FAN4931 amplifier is a single-supply, general-

purpose, voltage-feedback amplifier, fabricated on a bi-

CMOS 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 22. Overdrive Recovery

Figure 20. Typical Non-Inverting Configuration

Driving Capacitive Loads

Input Common-Mode Voltage

Figure 8 illustrates the response of the amplifier. A small

series resistance (R_S) at the output, illustrated in Figure

23, improves stability and settling performance. R_Svalues

in Figure 8 were chosen to achieve maximum bandwidth

with less than 2 dB of peaking. For maximum flatness,

use a larger R_S. Capacitive loads larger than 500 pF

require the use of R_S.

The common-mode input range extends to 300 mV below

ground and to 100 mV above V_Sin 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 V_IN(700 mV

beyond either rail) is exceeded, externally limit the input

current to ±5 mA, as shown in Figure 21.

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.

FAN4931 • Rev. 1.0.2

www.fairchildsemi.com

8

Layout Considerations

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.

Evaluation

Description

Products

Include 6.8 μF and 0.01 μF ceramic capacitors.

Board

Place the 6.8 μF capacitor within 0.75 inches of the

power pin.

Single-Channel,

Dual-Supply,

FAN4931-011

FAN4931IP5X

5 -Lead SC70

Place the 0.01 μF capacitor within 0.1 inches of the

power pin.

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 24-

Figure 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.

Figure 24. Evaluation Board Schematic

Board Layout Information

Figure 25. Top Side

Figure 26. Bottom Side

FAN4931 • Rev. 1.0.2

www.fairchildsemi.com

9

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/.

FAN4931 • Rev. 1.0.2

www.fairchildsemi.com

10

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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1


型号：	FAN4931IP5X
厂家：	ONSEMI
描述：	运算放大器，低功耗，轨对轨 I/O，超低成本，CMOS 运算放大器放大器光电二极管运算放大器
文件：	总13页 (文件大小：1174K)
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