LMP7721MAEVALMF/NOPB National Semiconductor, LMP7721MAEVALMF/NOPB Datasheet

no-image

LMP7721MAEVALMF/NOPB

Manufacturer Part Number
LMP7721MAEVALMF/NOPB
Description
MULTI FUNCTION EVAL LMP7721MA
Manufacturer
National Semiconductor
Datasheet

Specifications of LMP7721MAEVALMF/NOPB

Lead Free Status / RoHS Status
Lead free / RoHS Compliant
© 2008 National Semiconductor Corporation
LMP7721
3 Femtoampere Input Bias Current Precision Amplifier
General Description
The LMP7721 is the industry’s lowest guaranteed input bias
current precision amplifier. The ultra low input bias current is
3 fA, with a guaranteed limit of ±20 fA at 25°C and ±900 fA at
85°C. This is achieved with the latest patent pending tech-
nology of input bias current cancellation amplifier circuitry.
This technology also maintains the ultra low input bias current
over the entire input common mode voltage range of the am-
plifier.
Other outstanding features, such as low voltage noise (6.5
nV/
and low offset voltage temperature coefficient (−1.5 µV/°C),
improve system sensitivity and accuracy in high precision ap-
plications. With a supply voltage range of 1.8V to 5.5V, the
LMP7721 is the ideal choice for battery operated portable ap-
plications. The LMP7721 is part of the LMP
plifier family.
As part of National’s PowerWise
provides the remarkably wide gain bandwidth product (GBW)
of 17 MHz while consuming only 1.3 mA of current. This wide
GBW along with the high open loop gain of 120 dB enables
accurate signal conditioning. With these specifications, the
LMP7721 has the performance to excel in a wide variety of
applications such as electrochemical cell amplifiers and sen-
sor interface circuits.
The LMP7721 is offered in an 8-pin SOIC package with a
special pinout that isolates the amplifier’s input from the pow-
er supply and output pins. With proper board layout tech-
niques, the unique pinout of the LMP7721 will prevent PCB
leakage current from reaching the input pins. Thus system
error will be further reduced.
Block Diagram of a Typical Application
LMP
PowerWise
®
is a registered trademark of National Semiconductor Corporation.
®
), low DC offset voltage (±150 µV maximum at 25°C)
is a registered trademark of National Semiconductor.
®
products, the LMP7721
Ion Chamber: Current to Voltage Converter
202040
®
precision am-
Features
Unless otherwise noted, typical values at T
Applications
Input bias current (V
— max @ 25°C
— max @ 85°C
Offset voltage
Offset voltage drift
DC Open loop gain
DC CMRR
Input voltage noise (at f = 1 kHz)
THD
Supply current
GBW
Slew rate (falling edge)
Supply voltage
Operating temperature range
8-Pin SOIC
Photodiode amplifier
High impedance sensor amplifier
Ion chamber amplifier
Electrometer amplifier
pH electrode amplifier
Transimpedance amplifier
CM
= 1V)
20204084
A
= 25°C, V
−40°C to 125°C
March 14, 2008
www.national.com
1.8V to 5.5V
6.5 nV/
−1.5 μV/°C
12.76 V/μs
0.0007%
±900 fA
17 MHz
±26 µV
120 dB
100 dB
1.3 mA
S
±20 fA
= 5V.
Hz

Related parts for LMP7721MAEVALMF/NOPB

LMP7721MAEVALMF/NOPB Summary of contents

Page 1

... LMP7721 will prevent PCB leakage current from reaching the input pins. Thus system error will be further reduced. Block Diagram of a Typical Application LMP ® registered trademark of National Semiconductor Corporation. PowerWise ® registered trademark of National Semiconductor. © 2008 National Semiconductor Corporation Features Unless otherwise noted, typical values at T ■ ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance (Note 2) Human Body Model Machine Model V Differential IN Supply Voltage ( – V − ) (Note 10) S Voltage on Input/Output Pins Storage Temperature Range Junction Temperature (Note 3) 2 ...

Page 3

Symbol Parameter GBW Gain Bandwidth Product e Input-Referred Voltage Noise n i Input-Referred Current Noise n THD+N Total Harmonic Distortion + Noise kHz Electrical Characteristics Unless otherwise specified, all limits are guaranteed for T the ...

Page 4

Symbol Parameter e Input-Referred Voltage Noise n i Input-Referred Current Noise n THD+N Total Harmonic Distortion + Noise Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the ...

Page 5

Typical Performance Characteristics Input Bias Current vs. V Input Bias Current vs. V Input Bias Current vs. V Unless otherwise specified: T Input Bias Current vs 20204094 Input Bias Current vs 20204095 Offset Voltage Distribution CM ...

Page 6

Offset Voltage Distribution TCV Distribution OS Offset Voltage vs. V www.national.com 20204040 20204046 CM 20204022 6 TCV Distribution OS 20204045 Offset Voltage vs 20204021 Offset Voltage vs 20204023 ...

Page 7

Offset Voltage vs. Supply Voltage Supply Current vs. Supply Voltage Open Loop Frequency Response Gain and Phase Offset Voltage vs. Temperature 20204019 Open Loop Frequency Response Gain and Phase 20204038 Phase Margin vs. Capacitive Load 20204014 7 20204018 20204017 20204015 ...

Page 8

Phase Margin vs. Capacitive Load PSRR vs. Frequency Time Domain Voltage Noise www.national.com CMRR vs. Frequency 20204016 Input Referred Voltage Noise vs. Frequency 20204041 Small Signal Step Response 20204010 8 20204012 20204013 20204003 ...

Page 9

Small Signal Step Response 20204004 Large Signal Step Response 20204005 THD+N vs. Output Voltage 20204007 Large Signal Step Response THD+N vs. Output Voltage THD+N vs. Frequency 9 20204006 20204011 20204008 www.national.com ...

Page 10

THD+N vs. Frequency Sinking Current vs. Supply Voltage Sourcing Current vs. Output Voltage www.national.com Sourcing Current vs. Supply Voltage 20204009 Sourcing Current vs. Output Voltage 20204033 Sinking Current vs. Output Voltage 20204035 10 20204037 20204034 20204031 ...

Page 11

Sinking Current vs. Output Voltage 20204032 Output Swing Low vs. Supply Voltage 20204029 Output Swing Low vs. Supply Voltage 20204028 Output Swing High vs. Supply Voltage Output Swing High vs. Supply Voltage Output Swing High vs. Supply Voltage 11 20204025 ...

Page 12

Output Swing Low vs. Supply Voltage Application Information ADVANTAGES OF THE LMP7721 Ultra Low Input Bias Current The LMP7721 has the industry’s lowest guaranteed input bias current. The ultra low input bias current is typically 3 fA, with a guaranteed ...

Page 13

The signal conductor and the guard of the triax should be kept at the same potential; therefore, the leakage current between them is practically zero. Since triax has an extra layer of in- sulation and a second conducting sheath, it ...

Page 14

FIGURE 4. Error Caused by Amplifier’s Input Bias Current and Sensor Source Impedance Figure example of the LMP7721 used sensor amplifier. FIGURE 5. LMP7721 as pH Electrode Amplifier The output voltage from the pH ...

Page 15

Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin SOIC NS Package Number M08A 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 Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...

Related keywords