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TLV9001UIDBVR Datasheet(PDF) 32 Page - Texas Instruments

Part # TLV9001UIDBVR
Description  TLV900x Low-Power, RRIO, 1-MHz Operational Amplifier for Cost-Sensitive Systems
PDF  109 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

TLV9001UIDBVR Datasheet(HTML) 32 Page - Texas Instruments

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9.2.2.1 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
9.2.2.2 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.
OUT
IN
F
REF
V
I
R
V
u
(5)
Where:
1
2
REF
1
2
R
R
V
V
R
R
§
·
u
u ¨
¸
©
¹
(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.
REF
V
0.1 V
0.0303
V
3.3 V
(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.
OUT
REF
F
IN
V
V
3.2 V
0.1 V
kV
R
310
309 k
I
10
A
A
|
:
P
(8)
Calculate the value for the feedback capacitor based on RF and the desired –3-dB bandwidth, (f–3dB) using
Equation 9.
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
(9)
The minimum op amp bandwidth required for this application is based on the value of RF, CF, and the
capacitance on the INx– pin of the TLV9002 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.
IN
PD
CM
D
C
C
C
C
47 pF
5 pF
1 pF
53 pF
(10)
The minimum op amp bandwidth is calculated in Equation 11.
IN
F
BGW
2
F
F
C
C
f
324 kHz
2
R
C
t
t
u S u
u
(11)
The 1-MHz bandwidth of the TLV900x meets the minimum bandwidth requirement and remains stable in this
application configuration.
TLV9001, TLV9002, TLV9004
SBOS833R – OCTOBER 2017 – REVISED NOVEMBER 2021
www.ti.com
32
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Copyright © 2024 Texas Instruments Incorporated
Product Folder Links: TLV9001 TLV9002 TLV9004



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