SM5847AF datasheet(7/30 Pages) NPC

7 / 30 page

SM5847AF

NIPPON PRECISION CIRCUITS—7

AC Electrical Characteristics

Crystal oscillator (XTI, XTO)

VDD = VDDAC = 3.00 to 5.25 V, VSS = VSSAC = 0 V, Ta = −40 to 85 °C

External clock input (XTI)

VDD = VDDAC = 3.00 to 5.25 V, VSS = VSSAC = 0 V, Ta = −40 to 85 °C

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),

VSS = VSSAC = 0 V, Ta = −40 to 85 °C

P arameter

Symbol

Condition

Rating

Unit

min

typ

m a x

Oscillator frequency1

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

fOSC

–

5 0

MHz

P arameter

Symbol

Condition

Rating

Unit

min

typ

m a x

Master clock frequency

fXTI

–

6 0

MHz

Master clock duty

1/2VDD thresholds

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

fSYS1

V DD = V DDAC = 4.50 to 5.25 V

0.256

–

27.6

MHz

V DD = V DDAC = 3.00 to 5.25 V

0.256

–

2 5

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

System clock frequency

fSYS2

V DD = V DDAC = 4.75 to 5.25 V,

Ta = −40 to 70 °C

0.384

–

3 7

MHz

V DD = V DDAC = 3.00 to 5.25 V

0.384

–

20.7

SM5847AF Datasheet(PDF) 7 Page - Nippon Precision Circuits Inc

SM5847AF Datasheet(HTML) 7 Page - Nippon Precision Circuits Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Datasheet Download

Link URL