BLUENRG-2 datasheet(173/190 Pages) STMICROELECTRONICS

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BlueNRG-2

Electrical specifications

DocID030675 Rev 2

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9.5

High speed crystal oscillator characteristics

Characteristics measured over recommended operating conditions unless otherwise

specified. Typical value are referred to TA = 25 °C, VBAT = 3.0 V.

Table 222: High speed crystal oscillator characteristics

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

fNOM

Nominal

frequency

–

16/32

–

MHz

fTOL

Frequency

tolerance

Includes initial accuracy, stability over

temperature, aging and frequency pulling

due to incorrect load capacitance.

–

±50

ppm

ESR

Equivalent

series

resistance

–

100

Ω

Drive level

–

100

µW

9.5.1

High speed crystal oscillator

The BlueNRG includes a fully integrated low power 16/32 MHz Xtal oscillator with an

embedded amplitude regulation loop. In order to achieve low power operation and good

frequency stability of the XTAL oscillator, certain considerations with respect to the quartz

load capacitance C0 need to be taken into account. Figure 29: "High speed oscillator block

diagram" shows a simplified block diagram of the amplitude regulated oscillator used on

the BlueNRG-2.

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