STR720 datasheet(384/401 Pages) STMICROELECTRONICS

384 / 401 page

STR720 - ELECTRICAL CHARACTERISTICS

384/401

The electrical characteristics of STR720 oscillator are reported in Table 98.

VDD(all) = 1.80 V ± 10%, VDD3(all) = 3.30 V ± 10%, TA = -40 / +85 °C unless otherwise specified.

Data based on design characterization done with AEL Crystal (N. 4065), not tested in production

Table 97. Crystal oscillator recommanded characteristics

Symbol

Parameter

Conditions

Value

Unit

Min

Typ

Max

fOSCIN

Crystal Frequency

32.678

kHz

fTOL

Crystal frequency tolerance

-30

+30

ppm

Serial drain resistor

220

Ω

CG, CD

Recommended load capaci-

tors versus crystal load capac-

itance

RD = 220 kΩ

CL =9 pF

Including board-stray capaci-

tances

-15

RD = 220 kΩ

CL = 12.5 pF

Including board-stray capaci-

tances

-22

Table 98. Oscillator electrical characteristics

Symbol

Parameter

Test Conditions(1)

Value

Unit

Min

Typ

Max

VDDRTC

Supply Voltage for PLL

1.71

1.80

1.89

Oscillator Transconductance

µA/V

tSETUP

Oscillator Start-up Time (2)

Stable VDD

400

500

1000

Operating point voltage

956

-mV

VOSC

Output voltage amplitude(2)

CL = 12 pF, RD = 220 kΩ

788

mV(rms)

ROSC

Oscillation allowance(2)

CL = 12 pF, RD = 220 kΩ

500

Ω

fOFFSET

Static frequency deviation (

∆F/

F)(2)

CL = 12 pF, RD = 220 kΩ

+4.0

ppm

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