Hi guys,
we are working with ctm Trilogy Communications through Arrow disty in UK over a multi-socket project including our TLV320AIC3105 too.
Volumes are expected to be in the 5-10 Ku/yr.
I would need a clarification, as it seems there might be a typo in the datasheet release available at Ti.com.
Here I am using datasheet SLAS513C February 2007 – revised December 2014.
At the end of section 10.3.5 – Analog Fully Differential Line Output Drivers it states :
”..Each differential line output driver can be powered down independently of the others when it is not needed in the
system. When placed into power down through register programming, the driver output pins are placed into a
high-impedance state..”
Register 94 – Module Power Status Register was showing that both the LEFT_LOP/M and RIGHT_LOP/M drivers were powered down.
I assumed there must be a register to power them up since the statement above suggests they can be independently powered down. But I could not find it :-(
Register 86 – LEFT_LOP/M Output level Control Register has a bit in it (D0) which is called LEFT_LOP/M Power Control to show the status of the driver, however this bit is labelled as ‘R’ (read only).
If I write a ‘1’ to this bit to fully power the driver, then audio comes out.
Same applies to Register 93 - RIGHT_LOP/M Output level Control Register bit D0.
Consequently reading Register 94 then shows that both LEFT_LOP/M and RIGHT_LOP/M drivers are fully powered.
So it seems there is an error in the datasheet and both tables 86 and 90 for bit D0 should show R/W for the access field, isn't?
I did notice that a previous revision of datasheet had the description “LEFT_LOP/M Power Status” and “RIGHT_LOP/M Power Status” for bit D0.
Whereas the newer datasheet the description reads “LEFT_LOP/M Power control” and “RIGHT_LOP/M Power control”, hence why I eventually tried writing to the bit even though it states read only.
Also as an aside the newer datasheet tables 20 and 21 are duplicated, table 21 should be for register 16.
Thanks in advance to kindly confirm my assumptions, or giving instead an alternative explanation, my best regards
Sergio Fa
AskTexas – Signal Chain & Power Mgmt Eng
http://www.ti.com/lsds/ti/csc/support_EMEA.page
