CS2300-OTP Datasheet, PDF(15/28 Page) Cirrus Logic – Fractional-N Clock Multiplier with Internal LCO

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CS2300-OTP Datasheet, PDF (15/28 Pages) Cirrus Logic – Fractional-N Clock Multiplier with Internal LCO

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CS2300-OTP

tect[1:0] would then reflect the frequency range of the audio sample rate. An RUD of 512 generates the

audio oversampling clocks as shown in Table 4.

FsDetect[1:0]

Inferred Audio Sample Rate

< [59 to 72] kHz

>[59 to 72] kHz

and

<[138 to 168] kHz

> [138 to 168] kHz

Speed Mode (used for

audio converters)

Single Speed

Double Speed

Quad Speed

Audio Oversampling

Clock

512 x

256 x

128 x

Table 4. Example Audio Oversampling Clock Generation from CLK_IN

Referenced Control

Parameter Definition

Ratio 0-3................................âRatio 0 - 3â on page 21

RModSel[1:0] ........................âR-Mod Selection (RModSel[1:0])â section on page 20

AutoRMod .............................âAuto R-Modifier Enable (AutoRMod)â on page 21

M2Config[2:0]........................âM2 Pin Configuration (M2Config[2:0])â on page 22

5.4.4

Effective Ratio (REFF)

The Effective Ratio (REFF) is an internal calculation comprised of RUD and the appropriate modifiers, as

previously described. REFF is calculated as follows:

REFF = RUD â¢ R-Mod â¢ Auto R-Mod

Ratio modifiers which would produce an overflow or truncation of REFF should not be used. In all cases,

the maximum and minimum allowable values for REFF are dictated by the frequency limits for both the

input and output clocks as shown in the âAC Electrical Characteristicsâ on page 7.

Selection of the user defined ratio from the four stored ratios is made by using the M[1:0] pins.

Referenced Control

Parameter Definition

M[1:0] pins.............................âM1 and M0 Mode Pin Functionalityâ on page 17

5.4.5

Ratio Configuration Summary

The RUD is the user defined ratio for which up to four different values (Ratio0-3) can be stored in the one

time programmable memory. The M[1:0] pins then select the user defined ratio to be used as well as the

modal configuration set. The resolution/format for the RUD is selectable. R-Mods are applied according to

their settings. The user defined ratio, ratio modifier, and automatic ratio modifier make up the effective

DS844PP1

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