TDA7580 datasheet(16/39 Pages) STMICROELECTRONICS

16 / 39 page

Block diagram and electrical specifications

TDA7580

16/39

Note:

The accuracy depends on the quartz frequency precision: high stability oscillator

Table 10.

Oscillator characteristics

(Tj =-40°C to 125°C; VDD =1.7V to 1.9V, VDD3 = 3.15V to 3.45V)

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

FOSCFM Oscillator frequency (XTI/XTO)

74.1

MHz

Table 11.

Crystal characteristics for 1 and 2 chip load

Parameter name

Parameter value

1 chip load

2 chips load

Temperature range

-55°C÷125°C

Adjustment tolerance (@ 25°C ± 3°C)

± 30 ppm

Frequency stability (-20°C÷+70°C)

± 50 ppm

Aging @ 25°C

5 ppm/year

Shunt (static) capacitance [Co]

<5pF

Motional capacitance

1fF ± 30%

Mode of oscillation

AT-3rd

Resonance resistance

< 75 ohm

< 45 ohm

Capacitive load for oscillation frequency =

74.1MHz

10pF

12pF

Table 12.

External clock signal on XTI (In case the device is driven by an external clock

through the XTI pin, the characteristics reported in this table have to be met)

Parameter name

Parameter value

Min

Typ

Max

Unit

Clock frequency

74.10

MHz

Frequency stability (-20°C÷+70°C)

-50

ppm

Clock jitter

ps rms

Start up time

Clock level (sine wave) (1)

specified @ XTI pin of TDA7580

220

640

mV rms

Clock level (square wave) (1)

0.50

1.80

V p-p

Clock duty cycle (square wave)

Clock rise / fall time (square wave) (1)

500

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