ADF4208BRUZ-RL

Overview

The ADF4208BRUZ-RL is a dual integer-N phase-locked loop (PLL) frequency synthesizer from Analog Devices, designed for local oscillator generation in wireless communication systems. It integrates two independent PLLs: RF1 operating up to 2.0 GHz and RF2 operating up to 1.1 GHz. The device features selectable charge pump currents (1.25 mA or 5 mA), a programmable reference divider, and dual modulus prescalers (32/33 or 64/65). Powered by a single supply of 2.7 V to 5.5 V, it consumes typically 14 mA at 3 V. Control is managed via a 3-wire serial interface, and the component is housed in a 20-lead TSSOP package.

Feature Summary

• Dual PLL architecture with RF1 input frequency up to 2.0 GHz and RF2 input frequency up to 1.1 GHz
• Selectable charge pump currents of 1.25 mA and 5 mA with three-state leakage current of 1 nA
• Configurable dual modulus prescaler options of 32/33 or 64/65 for both RF sections
• Integrated on-chip oscillator circuitry allowing reference input derivation from crystal oscillators

Applications

• Wireless handsets supporting GSM, PCS, DCS, CDMA, and WCDMA standards
• Base stations for wireless radio networks including GSM, PCS, DCS, CDMA, and WCDMA
• Wireless LAN infrastructure equipment
• Communications test and measurement equipment
• CATV system components

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm packaging details such as reel quantity or tape-and-reel specifications. Ensure that the B version industrial temperature range (-40°C to +85°C) aligns with the target application environment requirements before finalizing procurement.

Selection Notes

Select the ADF4208 over the ADF4206 when higher frequency coverage is required, specifically for RF1 applications exceeding 550 MHz up to 2.0 GHz. Consider the selectable charge pump gain settings if precise loop filter design is needed to optimize phase noise performance. Verify that the external VCO input sensitivity falls within the specified -15 dBm to +4 dBm range for the intended supply voltage.

Part Context

This component belongs to the ADF420x family of dual frequency synthesizers, which also includes the ADF4206 and the discontinued ADF4207. The ADF4208 variant is distinguished by its extended upper frequency limits for both the RF1 and RF2 sections compared to the ADF4206. It shares the same functional block diagram and control interface logic as other members of the series.

Replacement Considerations

The ADF4206BRUZ is a compatible alternative within the same family but offers lower maximum frequencies (550 MHz for both RF1 and RF2). Direct substitution requires verifying that the system's frequency requirements do not exceed the ADF4206's capabilities.