DAC PCM5102 module pinout

[02GF74]

I'm looking at fitting one of these to a Cyrus DAD3 player which can be upgraded with a factory plug in QDAC module. It appears the pins to the QDAC match I2S and I have identified most of them on the PCM5102 module, photo below, but don't know what VIN is for.

In addition the QDAC has a pins labelled /ATTEN, TYPE and DOEN that does not appear to be supported on tis module - any idea what these are for?

And has anyone done something similar?

What I have so far is:

Pin Description QDAC pin
--- -------------------------- ----------------
SCK system clock X CLOCK
BCK bit clock BIT CK
DIN data input DATA
LCK data word WORD SEL

GND 0V
VIN ?

FLT filter select TYPE?
DEMP de-emphasis D_EMPH
XSMT soft mute /MUTE
FMT audio format TYPE?

A3V3 3.3 V supply

AGND analog ground
OUTR right channel output

AGND analog ground
OUTL left channel output

 

[thirdicomplex]

VIN = voltage in. From a quick Google search it looks like it needs 3.3V

 

[Flunk]

Hey did you ever get this to work? Was thinking about trying something similar.
Looking at the TDA1305T datasheet ATTEN seems to be 12dB attenuation input btw.