Copyright © Cirrus Logic, Inc. 2006
(All Rights Reserved)
http://www.cirrus.com
Contacting Cirrus Logic Support
For all product questions and inquir ies, contact a Cirrus Logic Sales Representative.
To find the one nearest you, go to http://www.cirrus.com
Errata: CS4270 Rev C0 Silicon
Reference CS4270 Data Sheet DS686PP1
Measured DAC THD+N (0 dB) with VA = 5 V or 3.3 V (nominal voltage) could be -81 dB and does not
meet the -83 dB maximum specification in the Data Sheet. Measured DAC THD+N (0 dB) with VA =
3.0 V (3.3 V min.) is -79 dB and does not meet the -83 dB maximum specification in the Data Sheet.
The digital portions of the part (both ADC and DAC) will not function when MCLK divide by 1.5 is
selected and VD = 3.3 V. The following start-up sequences will correct the problem.
In Control Port Mode:
– Power-up the part
– Hold MCLK Static
– Hard reset the part
–Set PDN
– Set the Ratio Select bits in Reg. 03h
– Release PDN
In Stand-Alone Mode:
– Power-up the part
– Hold the part in reset
– Set the MDIV1,2 pin logic levels
– Release reset
AUGUST '06
ER686B2
