SM5847AF

NIPPON PRECISION CIRCUITS—7

AC Electrical Characteristics

Crystal oscillator (XTI, XTO)

External clock input (XTI)

Internal system clock

The crystal oscillator frequency or external clock input master clock frequency ratings are described in the pre-

ceding tables, but it is the internal system clock frequency rating, set by the internal frequency divider

(CKDV1, CKDV2), that must be satisfied. The master clock frequency is a multiple of the sampling frequency

fs.

CKDV1 = CKDV2 = LOW (internal system clock frequency = XTI input frequency),

P arameter

Symbol

Condition

Rating

Unit

min

typ

m a x

1. External circuit components should be matched for the crystal oscillator element used.

–

–

5 0

MHz

P arameter

Symbol

Condition

Rating

Unit

min

typ

m a x

Master clock frequency

–

–

6 0

MHz

Master clock duty

4 0

–

6 0

%

P arameter

Symbol

Condition

Rating

Unit

min

typ

m a x

256fs (CKSLN = LOW , CKDV1 = LOW , CKDV2 = LOW )

System clock frequency

0.256

–

27.6

MHz

0.256

–

2 5

192fs (CKSLN = HIGH, CKDV1 = LOW , CKDV2 = LOW )

System clock frequency

0.384

–

3 7

MHz

0.384

–

20.7