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TLV320AIC3254EVM-K: I2S DIN lowering slave DOUT levels

Part Number: TLV320AIC3254EVM-K
Other Parts Discussed in Thread: TLV320AIC3254,

Hi Gents, 

i'm using the TLV320AIC3254 as a codec between analog mic and speaker and a radio module.

Frames on the I2S interface ( Dout / WCLK / BCLK)  so the TLV outputs are from 0 to 3.3V.

Signal from my radio module to the TLV ( module DOUT) are 0-3.3V when not connected to TLV DIN, but drop to 0-500mV when connected, so i've got no audio coming out on the analog side of the TLV.

The TLV is configured as a Master, 16kHz of sampling rate.

I'm using the TLV320AIC3254EVM-K to test the configuration.

I've checked the following :

- Page0 / Register 32, D0 is set to 0 (DIN is used for Audio Data In).

- Page0/Register 54 igot D2-D1 set to 01 (DIN is enabled for Primary Data Input or Digital Microphone Input or General Purpose Clock input)

Can someone assist to understand why the received signal is lowered?