AK1542A 参数 Datasheet PDF下载

[AK1542A]

AK1542A

20 to 600MHz Integer-N Frequency Synthesizer

1. Overview

Consisting a highly accurate charge pump that supports current adjustment in 9 steps, a reference divider, a programmable

divider and a dual-modulus prescaler (P/P+1), the AK1542A provides high performance, low consumption current and small

footprint for a wide range of frequency conversions . This synthesizer also has two general-purpose output pins which allow it

to be used to control the RF front end.

An ideal Phase Locked Loop (PLL) can be achieved by combining the AK1542A with the external loop filter and VCO (Voltage

Controlled Oscillator). Access to the registers is controlled via a 3-wire serial interface. The operating supply voltage is from

2.7 to 5.5V; and the supply voltage for the charge pump and that for the serial interface can be driven separately.

2. Features

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Operating frequency:

Programmable charge pump current:

20 to 600MHz

158 to 2528A typical

The charge pump current can be changed in 9 steps; and the current

range can be adjusted by the external resistance.

Two current settings can be specified with the register and switched

over from one to another using the timer.

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Supply Voltage:

Separate power supply for the charge pump:

On-chip power-saving features

On-chip lock detection feature of PLL:

2.7 to 5.5 V (PVDD pin)

PVDD to 5.5V (CPVDD pin)

Direct output to the PFD (Phase frequency detector)

or digital filtering output can be selected.

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General-purpose output:

Very low consumption current:

Package:

Operating temperature:

It has two general-purpose output ports to control peripheral parts.

2.2mA typical

24pin QFN (0.5mm pitch, 4mm4mm0.75mm)

-40C to 85C

MS1399-E-00

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2012/3