- on Microcontrollers
- Published in issue 2/2002 on page 0
Handy S/PDIF Checker
a Digital Audio test unit
Audio equipment with digital signal interfaces offer high quality sound but trying to listen to what is happening at the interface is not easy without specialised test equipment. A new S/PDIF decoder chip with built-in D/A converters forms the heart of this simple but useful piece of test kit.The S/PDIF audio digital interface standard has been around for a few years now and is increasingly being adopted by the latest models of CD players, DAT recorders and mini disc systems. Trouble-shooting digital systems invariably calls for the use of expensive test gear to analyse the signals. This circuit idea offers a simple low-cost method of listening-in to the digital interface.This design uses just one 28-pin SMD chip that together with a voltage regulator and a few passive components produces a useful S/PDIF interface tester. The IC in question is the recently introduced IEC-958 Audio DAC type UDA1350ATS or UDA1351TS from Philips.