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THS4551: Minimum Input Frequency

Part Number: THS4551

Hi Team,

 The input frequency for the customer application is 0.1 to 3KHz, the circuit configuration is a 10 times gain amplifier.
 The Fig.68 Differential Open-Loop Output Impedance in datasheet shows that the impedance at low frequency is high impedance.

 The customer's application uses TH4551 at Closed-Loop,  Closed-Loop Output Impedance will be small. is it possible to use TH4551 at the customer application? 

Regards,
Ogasawra