I might need to implement such a device on PCB that is best suited for SMDs. Unfortunately, cd4517b is an older device that's avail only in DIP

https://www.ti.com/lit/ds/symlink/cd4517b.pdf

Is there a modern equivalent of such a device.

The application is for an audio DAC.

Thanks!

 

FYI, this is where the cd417b resides in a 1995 schematic (Cambridge Audio, DACMAGIC 2). Two cd4517's are used. The ad hoc purpose is to "split" a DATA (i2S) signal into separate L and R DATA signals. This allows the a stereo dac IC to function as a single-channel mono unit.



There are other other "dirtier" ways to do the same thing, but much more glue logic is involved, as is in the case of this Rotel cd player:

 

If the IC is no longer available you can create the same function with an MCU or FPGA.

 

When I worked at Wadia 15 years ago all of the processing of the audio chain was done in FPGAs. There was nary an MSI part to be found on any of the boards except for the RS-485 differential transceivers.

 

I might need to implement such a device on PCB that is best suited for SMDs. Unfortunately, cd4517b is an older device that's avail only in DIP

https://www.ti.com/lit/ds/symlink/cd4517b.pdf

Is there a modern equivalent of such a device.

The application is for an audio DAC.

Thanks!

https://uk.farnell.com/on-semicondu...ister-dual-wsoic/dp/3368380?st=shift register

 

FPGA would be the way forward for this task if the cost of development is justified.
There are a few lower cost development systems available these days which you could investigate, it really depends on volumes expected for this unit.

 

I don't know how to program FPGA. But, yes, that would be an option. The question is, are FPGA's as fast and clean as stand alone chips and ASICs. In audio, jitter and other issues can creep in out of no where.

 

I don't know how to program FPGA. But, yes, that would be an option. The question is, are FPGA's as fast and clean as stand alone chips and ASICs. In audio, jitter and other issues can creep in out of no where.

FPGAs are faster, better and more flexible than standalone chips. The development software is free in most cases. An FPGA usually programs itself from a large serial non-volatile memory co-located on the board with the FPGA. This allows field upgrades to the FPGA if required. The serial EEPROM is programmed from the development software.