CS8420-CSZ Cirrus Logic Inc, CS8420-CSZ Datasheet - Page 86

• Manufacturer Part Number: CS8420-CSZ
• Description: IC SAMPLE RATE CONVERTER 28SOIC
• Manufacturer: Cirrus Logic Inc
• Type: Sample Rate Converterr

Specifications of CS8420-CSZ

• Package / Case: 28-SOIC
• Applications: CD-R, DAT, DVD, MD, VTR
• Mounting Type: Surface Mount
• Operating Supply Voltage: 5 V
• Operating Temperature Range: - 10 C to + 70 C
• Mounting Style: SMD/SMT
• Resolution: 17 bit to 24 bit
• Control Interface: 3 Wire, Serial
• Supply Voltage Range: 4.75V To 5.25V
• Audio Ic Case Style: SOIC
• No. Of Pins: 28
• Bandwidth: 20kHz
• Rohs Compliant: Yes
• Audio Control Type: Volume
• Dc: 0841
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 598-1782 - EVALUATION BOARD FOR CS8420
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 598-1125-5

CS8420
transmitter can read out data that had previously accumulated, allowing the FIFO to empty out. If the FIFO
becomes completely empty, zeros are transmitted until a complete message is written into the FIFO.
Mode 4 is not fail-safe; the FIFO can still get completely full if there isn't enough “zero-padding” between
incoming messages. It is up to the user to provide proper padding, as defined below:
Minimum padding
= (Fsi/Fso - 1)*[8N + (N-1)*IF +9] + 9
where N is the number of IUs in the message, IF is the number of filler bits between each IU, and Fso ≤ Fsi.
Example 1: Fsi/Fso = 2, N=4, IF=1: minimum proper padding is 53 bits.
Example 2: Fsi/Fso = 1, N=4, IF=7: min proper padding is 9 bits.
The CS8420 detects when an overwrite has occurred in the FIFO, and synchronously resets the entire
FIFO structure to prevent corrupted U data from being merged into the transmitted AES3 data stream.
The CS8420 can be configured to generate an interrupt when this occurs.
Mode 4 is recommended for properly formatted U data where mode 3 cannot provide acceptable perfor-
mance, either because of a too-extreme Fsi/Fso ratio, or because it's unacceptable to change the lengths
of filler segments. Mode 4 provides error-free performance over the complete range of Fsi/Fso ratios (pro-
vided that the input messages are properly zero-padded for Fsi > Fso).
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