ASNT8052-PQB

Overview

The ASNT8052-PQB is a programmable clock multiplier unit (CMU) fabricated in SiGe technology, operating within the 11–14.4 GHz range. It integrates dual voltage-controlled oscillators (VCOs) and a phase-locked loop (PLL) to synthesize high-speed clocks from low-speed references. The device accepts LVDS, CML, or PECL reference inputs and provides full-rate or half-rate CML outputs alongside an LVDS divided clock output. Powered by a single +3.3 V supply with 585 mW consumption, it features closed-loop SSB phase noise better than -98 dBc/Hz at 10 MHz offset and includes on-chip loss-of-lock detection.

Feature Summary

• Dual-range PLL with selectable internal VCOs covering 11.0–13.3 GHz and 13.0–14.4 GHz
• Supports LVDS, CML, and PECL input interfaces with configurable termination
• Provides full-rate/half-rate CML outputs and LVDS divided clock with 90° phase adjustment
• Integrated loss-of-lock alarm and open-loop VCO control capability

Applications

• High-frequency clock generation for telecommunications systems
• Test and measurement equipment requiring low-jitter signals
• Data converter clocking in industrial automation
• Medical imaging system timing references

Procurement Notes

Verify the specific suffix 'PQB' corresponds to the 40-pin QFN package configuration as documented in the datasheet. Confirm RoHS compliance status per directive 2011/65/EU during sourcing. Ensure external loop filter components are selected according to the recommended schematic parameters to maintain specified phase noise performance.

Selection Notes

Select this component when operation between 11 GHz and 14.4 GHz is required with integrated VCOs. Choose based on interface compatibility; the LS CIB supports LVDS, CML, and PECL via control signal offecl. Ensure the application can accommodate the 40-pin QFN package and provide adequate thermal grounding through the center heat slug for junction temperatures up to 125 °C.

Part Context

Manufactured by Advanced Science And Novel Technology Company, Inc., the ASNT8052 series utilizes Silicon-Germanium (SiGe) processes for high performance and reliability. The ASNT8052-PQB specifically denotes the variant packaged in a standard 40-pin QFN format, distinguishing it from other package options within the broader family.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate alternative CMUs based on matching frequency ranges, SiGe fabrication technology, and compatible pinout configurations if direct replacement is necessary.

FAQ

How is the input interface configured?

The Low-Speed Clock Input Buffer (LS CIB) supports LVDS, CML, or PECL interfaces. Configuration is controlled by the offecl signal: set to logic '1' for LVDS mode (100 Ohm differential) or logic '0' for CML/PECL mode (50 Ohm single-ended).

What determines the active VCO frequency range?

The off12g control signal selects the VCO range. Logic '0' activates the higher-speed VCO (11.0–13.3 GHz), while logic '1' activates the lower-speed VCO (13.0–14.4 GHz).

Can the device operate without the PLL enabled?

Yes. Setting the offpll signal to logic '1' disables the PLL, causing the chip to function as a divider-by-16 of the input high-speed clock cep/cen.