STW5095T datasheet(15/73 Pages) STMICROELECTRONICS

15 / 73 page

Functional description

STw5095

14/72

Figure 3.

Power up block diagram

4.4

Master clock

The master clock pin (AMCK) accepts any frequency from 4 MHz to 32 MHz. The 4-32 MHz

range is divided in sub-ranges that have to be programmed in bits CKRANGE in CR30. The

jitter and spectral properties of this clock have a direct impact on the DAC and ADC

performance because it is used to directly or by integer division drive the continuous-time to

sampled-time interfaces.

Note that AMCK clock des not need to have any relation to any other digital or analog input

or output.

AMCK can be either a squarewave or a sinewave, bit AMCKSIN in CR30 selects the proper

input mode. When a sinewave is used as input, AMCK pin must be decoupled with a

capacitor. Specification for sinusoidal input can be found in

Section 10.2: AMCK with

sinusoidal input on page 55.

The AMCK clock is not needed when only analog functions are used. For this purpose an

internal oscillator with no external components can be used to operate the device (see

Analog-only operation on page 19).

POWERUP

ENANA

STw5095

ENMIXL

ENHPVCM

ENHPL

ENLS

ENHPR

ENMICR

ENMICL

ENLINR

ENLINL

ENOSC

ENADCR

ENADCL

ENDACR

ENDACL

AUDIO I/F

ENLOL

ENLOR

ENHSD

ENPLL

DAMAST ENDAOCK

ADMAST ENADOCK

MBIAS

ENAMCK

ENDACKGEN

ENADCKGEN

ENOSC=1

ENOSC=0

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