CS8421-CZZ Cirrus Logic Inc, CS8421-CZZ Datasheet - Page 24

• Manufacturer Part Number: CS8421-CZZ
• Description: IC SAMPLE RATE CONVERTER 20TSSOP
• Manufacturer: Cirrus Logic Inc
• Type: Sample Rate Converterr

Specifications of CS8421-CZZ

• Package / Case: 20-TSSOP
• Applications: CD-R, DAT, DVD, MD, VTR
• Mounting Type: Surface Mount
• Operating Supply Voltage: 3.3 V / 5.0 V
• Operating Temperature Range: - 10 C to + 70 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 598-1018 - BOARD EVAL FOR CS8421
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 598-1126-5

CS8421
4.6
Power Supply, Grounding, and PCB Layout
The CS8421 operates from a VD = +2.5 V and VL = +3.3 V or +5.0 V supply. These supplies may be set
independently. Follow normal supply decoupling practices; see
Figure
6.
Extensive use of power and ground planes, ground-plane fill in unused areas, and surface-mount decou-
pling capacitors are recommended. Decoupling capacitors should be mounted on the same side of the
board as the CS8421 to minimize inductance effects, and all decoupling capacitors should be as close to
the CS8421 as possible. The pin of the configuration resistors not connected to MS_SEL, SAIF, and SAOF
should be connected as close as possible to VL or GND.
The CS8421 is available in the compact QFN package. The underside of the QFN package reveals a metal
pad that serves as a thermal relief to provide for optimal heat dissipation. This pad must mate with an equally
dimensioned copper pad on the PCB and must be electrically connected to ground. A series of vias should
be used to connect this copper pad to one or more larger ground planes on other PCB layers.
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