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CS4341A-KS Folha de dados(PDF) 7 Page - Cirrus Logic |
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CS4341A-KS Folha de dados(HTML) 7 Page - Cirrus Logic |
7 / 32 page CS4341A DS582PP1 7 3. APPLICATIONS 3.1 Upgrading from the CS4341 to the CS4341A The CS4341A is pin and functionally compatible with all CS4341 designs, operating at the standard audio sample rates, that use pin 3 as a serial clock input. In addition to the features of the CS4341, the CS4341A supports standard sample rates up to 192 kHz, as well as automatic mode detection for sample rates be- tween 4 and 200 kHz. The automatic speed mode detection feature allows sample rate changes between single, double and quad-speed modes without external intervention. The CS4341A does not support an internal serial clock mode or sample rates between 50 kHz and 84 kHz (unless otherwise stated), as does the CS4341. 3.2 Sample Rate Range/Operational Mode Detect The device operates in one of three operational modes. The allowed sample rate range in each mode will depend on whether the Auto-Detect Defeat bit is enabled/disabled. 3.2.1 Auto-Detect Enabled The Auto-Detect feature is enabled by default in the control port register 5.1. In this state, the CS4341A will auto-detect the correct mode when the input sample rate (Fs), defined by the LRCK frequency, falls within one of the ranges illustrated in Table 1. Sample rates outside the specified range for each mode are not supported. 3.2.2 Auto-Detect Disabled The Auto-Detect feature can be defeated via the control port register 5.1. In this state, the CS4341A will not auto-detect the correct mode based on the input sample rate (Fs). The operational mode must be set appropriately if Fs falls within one of the ranges illustrated in Table 2. Please refer to section 5.1.1 for implementation details. Sample rates outside the specified range for each mode are not supported. Input Sample Rate (FS)MODE 4kHz - 50kHz Single Speed Mode 84kHz - 100kHz Double Speed Mode 170kHz - 200kHz Quad Speed Mode Table 1. CS4341A Auto-Detect MC1 MC0 Input Sample Rate (FS)MODE 0 0 4kHz - 50kHz Single Speed Mode 0 1 50kHz - 100kHz Double Speed Mode 1 0 100kHz - 200kHz Quad Speed Mode Table 2. CS4341A Mode Select |
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