W91030BS Просмотр технического описания (PDF) - Winbond

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W91030BS

CALLING LINE IDENTIFIER

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Preliminary W91030B

Crystal Oscillator

The operation frequency of the W91030B is 3.579545 MHz. Crystal oscillators, ceramic resonators or

other clock sources can be used. A crystal oscillator or ceramic resonator can be directly connected

to the OSCI and OSCO pins without the need for external components. If other clock sources are

used, the OSCI pin should be driven by a clock source and the OSCO pin used to drive other external

clocked devices, or left open. Figure 7-9 shows some applications.

The crystal specification is as follows:

Frequency:

3.579545 MHz

Frequency tolerance:

+/- 0.1 % (-40° C to +85° C)

Resonance mode:

Parallel

Load capacitance:

18 pF

Maximum series resistance: 150 Ω

Maximum drive level (mV): 2 mV

(a) With crystal osscillator or ceramic resonator

W91030B

OSCI OSCO

3.579545 MHz

(b) With other clock source

W91030B

OSCI OSCO

W91030B

OSCI OSCO

Oscillator

OSCO

3.579545 MHz

W91030B

OSCI OSCO

Figure 7-9. Some Application of Clock Driven Circuit

Bias Voltage Generator

The bias voltage generator provides a low impedance voltage source equal to VDD/2 and is used to

bias the gain control op-amp. The voltage source is also used for internal circuits. A 0.1 µF capacitor

had better be placed between the VREF pin and VSS to reduce noise.

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