LM7705MMX National Semiconductor, LM7705MMX Datasheet

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LM7705MMX

Manufacturer Part Number
LM7705MMX
Description
Manufacturer
National Semiconductor
Datasheet

Specifications of LM7705MMX

Operating Supply Voltage (min)
3V
Operating Supply Voltage (max)
5.25V
Operating Temp Range
-40C to 125C
Operating Temperature Classification
Automotive
Package Type
MSOP
Pin Count
8
Mounting
Surface Mount
Lead Free Status / RoHS Status
Supplier Unconfirmed

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LM7705MMX/NOPB
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© 2009 National Semiconductor Corporation
Low Noise Negative Bias Generator
General Description
The LM7705 is a switched capacitor voltage inverter with a
low noise, −0.23V fixed negative voltage regulator. This de-
vice is designed to be used with low voltage amplifiers to
enable the amplifiers output to swing to zero volts. The −0.23
volts is used to supply the negative supply pin of an amplifier
while maintaining less then 5.5 volts across the amplifier. Rail-
to-Rail output amplifiers cannot output zero volts when oper-
ating from a single supply voltage and can result in error
accumulation due to amplifier output saturation voltage being
amplified by following gain stages. A small negative supply
voltage will prevent the amplifiers output from saturating at
zero volts and will help maintain an accurate zero through a
signal processing chain. Additionally, when an amplifier is
used to drive an ADC’s input, it can output a zero voltage sig-
nal and the full input range of an ADC can be used. The
LM7705 has a shutdown pin to minimize standby power con-
sumption
Typical Application
201730
LM7705
Features
Applications
Regulated output voltage
Output voltage tolerance
Output voltage ripple
Max output current
Supply voltage
Conversion efficiency
Quiescent current
Shutdown current
Turn on time
Operating temperature range
8-Pin MSOP Package
True zero amplifier output
Portable instrumentation
Low voltage split power supplies
20173001
−40°C to 125°C
June 10, 2009
www.national.com
3V to 5.25V
up to 98%
−0.232V
4 mV
500 µs
26 mA
78 µA
20 nA
5%
PP

Related parts for LM7705MMX

LM7705MMX Summary of contents

Page 1

... ADC’s input, it can output a zero voltage sig- nal and the full input range of an ADC can be used. The LM7705 has a shutdown pin to minimize standby power con- sumption Typical Application © 2009 National Semiconductor Corporation LM7705 Features ■ Regulated output voltage ■ ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ESD Tolerance (Note 2) Human Body Model For input pins only For all other pins Machine Model 3.3V Electrical Characteristics ...

Page 3

Electrical Characteristics 5. µ FLY Symbol Parameter V Output Voltage OUT V Output Voltage Ripple R I Supply Current S I Shutdown Supply Current SD η Current Conversion ...

Page 4

... Connection Diagram Pin Number Ordering Information Package Part Number LM7705MM 8-Pin MSOP LM7705MME LM7705MMX Block Diagram www.national.com 8-Pin MSOP 20173002 Top View Pin Descriptions Symbol Description C C Positive Capacitor Connection F+ FLY V Power Ground SS SD Shutdown Pin If SD pin is LOW, device is ON ...

Page 5

Typical Performance Characteristics Output Voltage vs. Supply Voltage Output Voltage vs. Output Current Output Voltage Ripple vs. Temperature V = 3.3V and T = 25°C unless otherwise noted Supply Current vs. Supply Voltage 20173010 Output Voltage vs. Output ...

Page 6

Supply Current vs. Output Current Current Conversion Efficiency vs. Output Current Turn On Time www.national.com Supply Current vs. Output Current 20173016 Current Conversion Efficiency vs. Output Current 20173018 20173020 6 20173017 20173019 Turn On Time 20173021 ...

Page 7

Load Regulation vs. Temperature 20173022 Transient Response Transient Response Load Regulation vs. Temperature Transient Response 20173024 Transient Response 20173029 7 20173023 20173025 20173030 www.national.com ...

Page 8

Output voltage vs. shutdown Voltage Oscillator Frequency vs. Temperature www.national.com Supply Current vs. Shutdown Voltage 20173026 20173028 8 20173027 ...

Page 9

Application Information This applications section will give a description of the func- tionality of the LM7705. The LM7705 is a switched capacitor voltage inverter with a low noise, −0.23V fixed negative bias output. The part will operate over a supply ...

Page 10

... Amplifiers using CMOS technology do have a lower output saturation voltage. This is illustrated in Figure 6. E.g. National Semiconductors LM7332 can swing to 200 mV to the negative rail, for a 10 kΩ load, over all tem- peratures. ...

Page 11

... The introduction of operational amplifiers with output Rail-to- rail drive capabilities is a strong improvement and the (output) performance of op amps is for many applications no longer a limiting factor. For example, National Semiconductors LMP7701 (a typical rail-to-rail op amp), has an output drive capability of only 50 mV over all temperatures for a 10 kΩ load resistance ...

Page 12

The sensor generates a DC output signal. In this case coupled, 2-stage amplifier is used. The output voltage swing of the second op amp should me matched to the input voltage range of the Analog to Digital Converter ...

Page 13

The key specifications of the used components are given in the next part of the section. Supply Voltage/Reference Voltage Supply voltage +5V ADC Voltage Reference +5V LMP7701 V (typical DSAT V (over temperature DSAT LM7705 Output ...

Page 14

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 8-Pin MSOP NS Package Number MUA08A 14 ...

Page 15

Notes 15 www.national.com ...

Page 16

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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