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CS4340A Datasheet(PDF) 6 Page - Cirrus Logic

Part No. CS4340A
Description  24-Bit, 192 kHz Stereo DAC for Audio 
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Maker  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
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 6 page
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CS4340A
6
DS590PP2
3. APPLICATIONS
3.1
Upgrading from the CS4340 to the CS4340A
The CS4340A is pin and functionally compatible with all CS4340 designs, operating at the standard audio
sample rates, that use pin 3 as a serial clock input. In addition to the features of the CS4340, the CS4340A
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 mode detection feature allows sample rate changes between single,
double and quad-speed modes without external intervention.
The CS4340A does not support an internal serial clock mode, sample rates between 50 kHz and 84 kHz or
de-emphasis for 32 and 48 kHz, as does the CS4340.
3.2
Sample Rate Range/Operational Mode Detect
The device operates in one of three operational modes. It 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. Sam-
ple rates outside the specified range for each mode are not supported.
3.3
System Clocking
The device requires external generation of the master (MCLK), left/right (LRCK) and serial (SCLK)
clocks. The LRCK, defined also as the input sample rate (Fs), must be synchronously derived from the
MCLK according to specified ratios. The specified ratios of MCLK to LRCK, along with several standard
audio sample rates and the required MCLK frequency, are illustrated in Tables 2-4.
Input Sample Rate (FS)MODE
4 kHz - 50 kHz
Single-Speed Mode
84 kHz - 100 kHz
Double-Speed Mode
170 kHz - 200 kHz
Quad-Speed Mode
Table 1. CS4340A Auto-Detect




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