TS616 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

TS616

Dual wide band operational amplifier with high output current

STMicroelectronics 

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TS616

7.2

Noise measurements

Measurement of iNn

To measure the negative input current noise iNn, we set R3=0 and use Equation 5. This time

the gain must be lower in order to decrease the thermal noise contribution:

● R1=100 Ω, R2=910 Ω, R3=0, gain= 10.1

● Equivalent input noise: 3.40 nV/√Hz

● Negative input current noise: iNn =21 pA/√Hz

7.3

Measurement of iNp

To extract iNp from Equation 3, a resistance R3 is connected to the non-inverting input. The

value of R3 must be chosen in order to keep its thermal noise contribution as low as

possible against the iNp contribution.

● R1=100 Ω, R2=910 Ω, R3=100 Ω, Gain=10.1

● Equivalent input noise: 3.93 nV/√Hz

● Positive input current noise: iNp=15 pA/√Hz

● Conditions: Frequency=100 kHz, VCC = ±2.5 V

● Instrumentation: HP3585A Spectrum Analyzer (the input noise of the HP3585A is

8 nV/√Hz)

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