OPA333 datasheet(27/58 Pages) TI2

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(A) Noise in Noninverting Gain Configuration

GND

Source

GND

Source

(B) Noise in Inverting Gain Configuration

Noise at the output is given as EO, where:

Thermal noise of RS

Thermal noise of R1 || R2

Boltzmann Constant

Temperature in kelvins

:1; '

1 =

l1+42

p„¨:A

;2 +:A

;2 +

41æ42

o2+:E

„ 45

;2 +

„

d41„42

41 + 42

hp2 >8

4/5

:2; A

5 =

¥4„G$„6(-)„45 d 8

¾*V

:3; A

41æ42 =

¨4„G

„ 6(-) „

d41„42

41 + 42

h d 8

¾*V

:4; G

$ = 1.38065

„ 10

F23

d ,

:5; 6(-) = 237.15+6(°%) >-?

273

Noise at the output is given as EO, where:

Boltzmann Constant

Temperature in kelvins

Thermal noise of (R1 + RS) || R2

:6; '

1 =

l1+ 42

45 + 41

p„¨:A

;2 +

41+45 æ42

o2+FE

„

H:45 +41;„42

45 + 41 + 42 IG

4/5

:7; A

41+45 æ42 =

¨4„G

„ 6(-) „

H:45 +41;„42

45 + 41 + 42 I

d 8

¾*V

:8; G

$ = 1.38065

„ 10

F23

d ,

:9; 6(-) = 237.15+6(°%) >-?

273

where:

• en is the voltage noise spectral density of the amplifier. For the OPAx189 series of operational amplifiers, en =

5.2 nV/ √ Hz at 1 kHz.

• in is the current noise spectral density of the amplifier. For the OPAx189 series of operational amplifiers, in =

165 fA/ √ Hz at 1 kHz.

Figure 8-6. Noise Calculation in Gain Configurations

8.4 Device Functional Modes

The OPAx189 has a single functional mode, and is operational when the power-supply voltage is greater than

4.5 V (±2.25 V). The maximum power supply voltage for the OPAx189 is 36 V (±18 V).

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