NB2769A 查看數據表（PDF） - ON Semiconductor

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NB2769A

Low Power, Reduced EMI Clock Synthesizer

ON Semiconductor 

XIN/CLKIN

XOUT

Crystal

Oscillator

NB2769A

PD

Frequency

Divider

Feedback

Divider

Modulation

Phase

Detector

Loop

Filter

VDD

PLL

VCO

Output

Divider

ModOUT

Table 1. KEY SPECIFICATIONS

Supply Voltages

Frequency Range

Description

Cycle−to−Cycle Jitter

Output Duty Cycle

Modulation Rate Equation

Frequency Deviation

VSS

Figure 1. Block Diagram

For 2.5 V Supply

For 3.3 V Supply

Specification

VDD = 3.3 V / 2.5 V

6 MHz < CLKIN < 12 MHz

6 MHz < CLKIN < 13 MHz

200 ps (maximum)

45/55% (worst case)

FIN/256

"1% @ 10 MHz

PD 1

XOUT 2

XIN/CLKIN 3

NB2769A

6 VSS

5 ModOUT

4 VDD

Figure 2. Pin Configuration

Table 2. PIN DESCRIPTION

Pin #

1

2

3

4

5

6

Pin Name

PD

XOUT

XIN/CLKIN

VDD

ModOUT

VSS

Type

Description

I Powerdown control pin. Pull low to enable powerdown mode. Connect to VDD if not used.

O Crystal connection. If using an external reference, this pin must be left unconnected.

I Crystal connection or external reference frequency input. This pin has dual functions. It can be

connected either to an external crystal or an external reference clock.

P Power supply for the entire chip.

O Spread spectrum clock output.

P Ground connection.

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