cs4239 Cirrus Logic, Inc., cs4239 Datasheet - Page 91

• Manufacturer Part Number: cs4239
• Description: Crystalclear? Ortable Isa Audio System Logic
• Manufacturer: Cirrus Logic, Inc.

Power Supplies
VA - Analog Supply Voltage
AGND - Analog Ground
VD1 - ISA Digital Supply Voltage
DGND1 - ISA Digital Ground
VDF1, VDF2, VDF3 - Digital Filtered Supply Voltage
SGND1, SGND2, SGND3, SGND4 - Internal Digital Ground
DS253PP2
Ground reference to the analog section of the codec. This pin should be placed on an analog
ground pin separate from other chip grounds.
Digital supply for the parallel data bus pins. This pin can be connected to either 3.3 V or 5 V
power supply. When connected to a 3.3 V supply, all ISA bus pins must also be at 3.3 V.
Digital ground reference for the parallel data bus pins. These pins are isolated from the other
grounds and should be connected to the digital ground section of the board (see Figure 25).
Digital supply for the internal digital section of the codec (except for the parallel data bus).
These pins should be filtered, using a ferrite bead, from VD1.
Ground reference for the internal digital section of the codec. Optimum layout is achieved by
placing SGND1/2/3/4 on the digital ground plane with the DGND pin as shown in Figure 25.
Supply to the analog section of the codec.
CrystalClear Portable ISA Audio System
TM
CS4239
91