User Manual

30 DS658F4
CS5345
system logic supply (VLS or VLC) or may be powered from the analog supply (VA) via a resistor. In this
case, no additional devices should be po wered from VD. Power supply d ecoupling capacitor s should be as
near to the CS5345 as possible, with the low value ceramic capacitor being the nearest. All signals, espe-
cially clocks, should be kept away from the FILT+ and VQ pins in or der to avoid u nwanted coupling into the
modulators. The FILT+ and VQ decoupling capacitors, particula rly the 0.1 µF, must be positioned to mini-
mize the electrical path from FILT+ and AGND. The CS5345 evaluation board demonstrates the optimum
layout and power supp ly arra ng eme nts. To minimi ze digital noise, co nnect th e CS5 345 digital ou tp uts only
to CMOS inputs.