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LMV358AIDGKT Datasheet(PDF) 19 Page - Texas Instruments

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Part No. LMV358AIDGKT
Description  Low-Voltage Rail-to-Rail Output Operational Amplifiers
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LMV358AIDGKT Datasheet(HTML) 19 Page - Texas Instruments

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IN
F
BGW
2
F
F
C
C
f
324 kHz
2
R
C
t
t
u S u
u
IN
PD
CM
D
C
C
C
C
47 pF 5 pF 1 pF
53 pF
F
F
3dB
1
1
C
10.3 pF
10 pF
2
R
f
2
309 k
50 kHz
|
u S u
u
u S u
: u
OUT
REF
F
IN
V
V
3.2 V
0.1 V
kV
R
310
309 k
I
10 A
A
|
:
P
REF
V
0.1 V
0.0303
V
3.3 V
1
2
REF
1
2
R
R
V
V
R
R
§
·
u
u ¨
¸
©
¹
OUT
IN
F
REF
V
I
R
V
u
19
LMV321A, LMV358A, LMV324A
www.ti.com
SBOS923B – DECEMBER 2017 – REVISED JUNE 2018
Product Folder Links: LMV321A LMV358A LMV324A
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
Typical Application (continued)
8.2.2.1 Design Requirements
The design requirements for this design are:
Supply Voltage: 3.3 V
Input: 0 µA to 10 µA
Output: 0.1 V to 3.2 V
Bandwidth: 50 kHz
8.2.2.2 Detailed Design Procedure
The transfer function between the output voltage (VOUT), the input current, (IIN) and the reference voltage (VREF)
is defined in Equation 5.
(5)
Where:
(6)
Set VREF to 100 mV to meet the minimum output voltage level by setting R1 and R2 to meet the required ratio
calculated in Equation 7.
(7)
The closest resistor ratio to meet this ratio sets R1 to 11.5 kΩ and R2 to 357 Ω.
The required feedback resistance can be calculated based on the input current and desired output voltage.
(8)
Calculate the value for the feedback capacitor based RF and the desired –3-dB bandwidth, (f-3dB) using
Equation 9.
(9)
The minimum op amp bandwidth required for this application is based on the value of RF, CF, and the
capacitance on the IN– pin of the LMV358A which is equal to the sum of the photodiode shunt capacitance,
(CPD) the common-mode input capacitance, (CCM) and the differential input capacitance (CD) as Equation 10
shows.
(10)
The minimum op amp bandwidth is calculated in Equation 11.
(11)
The 1-MHz bandwidth of the LMV3xxA meets the minimum bandwidth requirement and remains stable in this
application configuration.


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