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LMP7721_15

更新时间： 2024-11-23 01:15:11
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德州仪器 - TI /
页数 文件大小 规格书
32页 980K
描述
3-Femtoampere Input Bias Current Precision Amplifier

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LMP7721  
SNOSAW6E –JANUARY 2008–REVISED DECEMBER 2014  
LMP7721 3-Femtoampere Input Bias Current Precision Amplifier  
1 Features  
3 Description  
The LMP7721 is the industry’s lowest specified input  
1
•
Unless Otherwise Noted, Typical Values at TA =  
25°C, VS = 5 V.  
bias current precision amplifier. The ultra-low input  
bias current is 3 fA, with a specified limit of ±20 fA at  
25°C and ±900 fA at 85°C. This is achieved with the  
latest patent-pending technology 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  
amplifier.  
•
Input Bias Current (VCM = 1 V)  
–
–
Maximum at 25°C ±20 fA  
Maximum at 85°C ±900 fA  
•
•
•
•
•
•
•
•
•
•
•
•
Offset Voltage ±26 µV  
Offset Voltage Drift −1.5 μV/°C  
DC Open-Loop Gain 120 dB  
DC CMRR 100 dB  
Other outstanding features, such as low voltage noise  
(6.5 nV/√Hz), low DC-offset voltage (±150 µV  
maximum at 25°C) and low-offset voltage  
temperature coefficient (−1.5 µV/°C), improve system  
Input Voltage Noise (at f = 1 kHz) 6.5 nV/√Hz  
THD 0.0007%  
sensitivity  
and  
accuracy  
in  
high-precision  
Supply Current 1.3 mA  
applications. With a supply voltage range of 1.8 V to  
5.5 V, the LMP7721 is the ideal choice for battery-  
operated, portable applications. The LMP7721 is part  
of the LMP™ precision amplifier family.  
GBW 17 MHz  
Slew Rate (Falling Edge) 12.76 V/μs  
Supply Voltage 1.8 V to 5.5 V  
Operating Temperature Range −40°C to 125°C  
8-Pin SOIC  
As part of Texas Instruments' PowerWise™ products,  
the LMP7721 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  
2 Applications  
accurate  
signal  
conditioning.  
With  
these  
•
•
•
•
•
•
Photodiode Amplifier  
specifications, the LMP7721 has the performance to  
excel in a wide variety of applications such as  
electrochemical cell amplifiers and sensor interface  
circuits.  
High Impedance Sensor Amplifier  
Ion Chamber Amplifier  
Electrometer Amplifier  
pH Electrode Amplifier  
Transimpedance Amplifier  
The LMP7721 is offered in an 8-pin SOIC package  
with a special pinout that isolates the amplifier’s input  
from the power supply and output pins. With proper  
board layout techniques, the unique pinout of the  
LMP7721 will prevent PCB leakage current from  
reaching the input pins. Thus system error will be  
further reduced.  
Ultra-Low Input Bias Current  
5
0
Device Information(1)  
-5  
PART NUMBER  
PACKAGE  
BODY SIZE (NOM)  
LMP7721  
SOIC (8)  
4.90 mm × 3.90 mm  
-10  
(1) For all available packages, see the orderable addendum at  
the end of the datasheet.  
+
V
V
5V  
=
-15  
-20  
-
= 0V  
T
= 25°C  
A
0
0.5  
1
1.5  
2
2.5  
3
3.5  
V
CM  
(V)  
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,  
intellectual property matters and other important disclaimers. PRODUCTION DATA.  
 
 
 
 
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