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AMC1351: AMC1351

Nozaki Kenji
Prodigy 20 points
Part Number: AMC1351
Other Parts Discussed in Thread: TLV6001, , INA597

Tool/software:

Hello, this is Ken.

I have a question about the circuit in Figure 8-3, listed in section 2.2.2.2 Differential to Single-Ended Output Conversion in the AMC1351 datasheet. I want the voltage applied to the AMC1351's IN to be the same as the voltage output from the TLV6001's OUT (in other words, I want to set the total gain to 1). What are the optimal values ​​for R1, R2, R3, R4, C1, and C2 in this case?

Also, please tell me the formula for calculating the TLV6001's OUT value from the AMC1351's IN value.

The input voltage specifications for the circuit are as follows:

The AMC1351's VDD1 and VDD2 and the TLV6001's V+ are 3.3V, VREF is 1.65V, and the AMC1351's input voltage range is 1.65V to 2.75V.

Thank you in advance.

  • 0
    TI__Mastermind 33483 points

    Hello Ken,

    Since the AMC1351 is in a gain of 0.4V/V, to create a differential to single ended circuit with a total gain of 1V/V, you will need a difference amplifier in a gain of 2.5V/V.

    Building a discrete difference amplifier may have some inaccuracies, but you may follow the below design guidelines to create your desired gain.

    https://www.ti.com/lit/an/sboa274a/sboa274a.pdf

    If it is acceptable to not have exactly a total gain of 1V/V, you may use an integrated difference amplifier in a gain of 2, and get a total gain of 0.8V/V. INA597 offers excellent performance to minimize any added error to your signal chain.

    Best,
    Gerasimos