Datasheet > PS2500AIT

PS2500AIT

更新时间： 2024-01-06 19:43:19

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Low-Power Direct Digital Modulation Frequency Synthesizer

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PS2500AIT 数据手册

PS2500 2.2 GHz Fractional-N Frequency Synthesizer

Low-Power Direct Digital Modulation Frequency Synthesizer

Preliminary Datasheet V1.2

Features

Product Description

• 2.2 GHz maximum operating

frequency

The PS2500 Direct Digital Modulation Fractional-N frequency synthesizer

provides ultra-fine frequency resolution, fast switching speed, and low

phase-noise performance. This synthesizer is a key building block in designing

high-performance narrowband and multi-band radio systems that require low

power and fine step size.

• 500 MHz maximum auxiliary

synthesizer

• Ultra-small step size 100 Hz or

less

The ultra-fine step size of less than 100 Hz allows this synthesizer to be used in

very narrowband wireless applications. With proper temperature sensing or

through control channels, the synthesizer’s fine step size can compensate for

crystal oscillator or IF filter drift. As a result, crystal oscillators or crystals can

replace temperature-compensated or ovenized crystal oscillators, reducing parts

count and associated component cost. The PS2500’s fine step size can also be

used for doppler shift corrections.

• High-reference frequency enables

larger loop bandwidth PLL

• Fast switching speed

• Phase-noise to -92 dBc/Hz inside

the loop filter bandwidth

• Spurious -70 dBc/Hz inside the

loop filter bandwidth

The PS2500 has a phase noise floor of -92 dBc/Hz up to 2.2 GHz operation.

This is permitted by the on-chip low noise prescalers and low divide ratios

provided by the IC’s high fractionality.

• Software programmable

power-down modes

• High-speed serial interface

• 3-wire programming

Reference crystals or oscillators up to 50 MHz can be used with the PS2500.

The crystal frequency is divided down by independent programmable dividers

(1 to 32) for the main and auxiliary synthesizers. The phase detectors can

operate at a maximum speed of 25 MHz, permitting better phase noise due to

the lower division value. With a high reference frequency, the loop bandwidths

can also be increased. Larger loop bandwidths improve the settling times and

reduce in-band phase noise. Typical switching times of less than 100 ms can

thus be achieved with a 10 MHz reference. The PS2500’s lower in-band phase

noise also permits the use of lower cost Voltage Controlled Oscillators (VCOs)

in customer applications.

• Programmable division ratios on

reference frequency

• Phase detectors with

programmable gain provide a

programmable loop bandwidth

• Frequency Power Steering

speeds up acquisition 5x with

same loop bandwidth

The PS2500 has a Frequency Power Steering^TMcircuit (patent pending), which

assists the loop filter to steer the VCO when the frequency is too fast or too

slow. In this configuration, acquisition times of up to five times faster than

conventional phase/frequency detectors can be achieved.

• On-chip crystal oscillator

• Frequency adjust for temperature

compensation

• Direct digital modulation

• 3 volt operation

The unit operates with a 3-wire, high-speed serial interface. A combination of a

large bandwidth, fine resolution, and the 3-wire, high-speed serial interface

allows for a direct phase and frequency modulation of the VCO. This supports

any constant envelope and continuous phase modulation which means any

analog FM or digital FM. This capability can eliminate the need for I & Q

DACs, quadrature upconverters, and IF filters from the transmitter portion of

the radio system.

• 5 volt output to loop filter

• 28-pin EP-TSSOP package

Philsar Semiconductor Inc.

146 Colonnade Road S.

Nepean, Ontario, Canada

Tel: 613-274-0922

- 1 -

Fax: 613-274-0915

www.philsar.com

PMP-001-DS2 V1.2

K2E 7Y1

12 3 4 5 6 7...28

中文翻译

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