92HD005 Datasheet, PDF (183/205 Pages) Integrated Device Technology – 4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE

92HD005/92HD005D
4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE
PC AUDIO
6.2. PCB Layout Recommendations
An optimum layout is one with all components on the same side of the board, minimizing vias
through other signal layers. Other signal traces should be routed away from the
92HD005/92HD005D. This includes signal traces just underneath the device, or on layers adjacent
to the ground plane layer used by the device.
Separate analog and digital grounding is recommended. The analog grounds (AVSS (pins 26 and
42)) and the digital grounds (DVSS (pins 4 and 7)) should be tied together at only one place. This tie
should be under the CODEC.
Capacitive coupling is allowed for EMI considerations. Generally, use 0.1 mF capacitors. Make sure
these are spread out in the layout.
Analog ground (AVSS) should be located on all grounding layers. AVSS should be the same shape
on these layers.
Analog audio signals should not escape the AVSS cut.
Analog non-audio signals should not enter the AVSS cut.
Only audio voltage planes (such as AVDD) should be located on the VCC layer.
Analog voltage should be provided from a filtered source. LDO’s are preferred. Ferrite beads are
acceptable. Whichever is used must support current requirements.
6.2.1. Vista WLP Compliance Requirements
The following external components are REQUIRED for Vista WLP compliance.
Required series coupling capacitors on analog I/O signal lines:
• Minimum Premium Desktop Implementations:
• Line Output = 10 mF, 1206, 10 V, X5R (ceramic) or 3.3 mF aluminum electrolytic (or similar).
• Headphone Output = 220 mF aluminum electrolytic (or similar).
• Microphone or Line Input = 1 mF, 0603, X5R (ceramic) or better.
• Minimum Premium Mobile Implementations:
• Line Output = 2.2 mF, 1206, 16 V, X5R (ceramic).
• Headphone Output = 100 mF D-Case size (or similar). Larger is better, we usually recom-
mend 220 mF.
• Microphone or Line Input = 1 mF, 0603, X5R (ceramic) or better.
IDT™
183
4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE
92HD005/92HD005D
V 1.0 12/06