4705.PGA2505_Output.pdf
Dear Sir,
My client intends to use PGA2505 in the next model also.
However, he found some phenomenon about PGA2505 ouput phase in case un-balanced input.
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{ Question }
Does PGA2505 automatically change the phase between Vout+/Vout- depend on PGA gain ( and also input signal
magnitude) ?
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Abstract of Client's result in EVM
(1)
; DC servo is desable
; PGA gain =0dB
; input is unbalanced input (VIN+ only )
; Input signal is large ( 10dBm)
===> Out+/Out- is In-phase
(2)
; DC servo is desable
; PGA gain =9dB
; input is unbalanced input (VIN+ only)
; Input signal is large ( 7dBm)
==> Out+/Out- is Out-phase
(3)
In case Input is balanced input, Out+/Out- is Out-phase regardless of
Input signal magnitude & PGA gain.
I had also attached the detail( photo and schematic) in pdf.
I hope this e-mail difinds you well.
I hope your advise within 3-working days
With My Best Regards
