SA8027DH,512

Clock Generators, PLLs, Frequency Synthesizers Overview

The SA8027DH,512 is a BICMOS RF fractional-N/IF integer frequency synthesizer manufactured by NXP USA Inc. It integrates programmable dividers, charge pumps, and phase comparators for phase-locked loop implementation. The device operates from a nominal 3 V supply (2.7–3.6 V) with a total operational supply current of 7.7 mA. It supports VCO input frequencies up to 2.5 GHz and auxiliary inputs up to 550 MHz. The main divider offers programmable integer ratios from 512 to 65535. It features a 3-wire serial programming bus, split supplies for digital and analog sections, and internal fractional spurious compensation.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Low phase noise performance suitable for cellular and WLAN standards
• Fully programmable main fractional-N and auxiliary integer dividers
• Internal fractional spurious compensation via dedicated DAC
• Fast locking adaptive mode with programmable charge pump speed-up

Clock Generators, PLLs, Frequency Synthesizers Applications

• Cellular phones supporting all major standards
• WLAN equipment operating in the 500 to 2500 MHz range
• Portable battery-powered radio equipment

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status as specified in the product data sheet. Check for end-of-life status or obsolescence notices prior to procurement planning.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the SA8027DH variant for TSSOP20 packaging requirements. Ensure external RSET resistor selection aligns with desired charge pump current settings. Verify that the application's reference frequency falls within the 5–40 MHz range and that supply voltages remain between 2.7 V and 3.6 V.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the SA8027 family of low voltage, low power RF synthesizers. The DH suffix indicates the TSSOP20 plastic thin shrink small outline package (SOT360-1). The device supersedes earlier Philips Semiconductors versions released prior to August 2001.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate pin-compatible alternatives only if they support identical 3-wire serial interfaces and comparable 2.5 GHz operation limits.

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the maximum VCO input frequency supported by the SA8027?

The synthesizer operates at VCO input frequencies up to 2.5 GHz.

How is the charge pump current determined?

The charge pump current is set by an external resistance connected to the RSET pin, in conjunction with control bits CP0 and CP1 in the C-word programming register.

What is the function of the fractional compensation feature?

Internal fractional spurious compensation reduces or eliminates fractional spurs caused by the fractional phase ripple of the main divider by injecting a proportional compensation current.