Datasheet

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February 2013

FAN4931 • Rev. 1.0.2

FAN4931 — Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier

FAN4931

Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier

Features



200 µA Supply Current per Amplifier

 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

 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

Description

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.

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.

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)

Summary of content (11 pages)

PAGE 1
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.
PAGE 2
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.
PAGE 3
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.
PAGE 4
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.
PAGE 5
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.
PAGE 6
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.
PAGE 7
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.
PAGE 8
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.
PAGE 9
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.
PAGE 10
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.
PAGE 11
FAN4931 — Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier © 2008 Fairchild Semiconductor Corporation FAN4931 • Rev. 1.0.2 www.fairchildsemi.