ADF4118BRU

Overview

The ADF4118BRU is a single Integer-N RF PLL frequency synthesizer from Analog Devices, designed for local oscillator implementation in wireless transceivers. It supports an RF input frequency range of 0.1 GHz to 3.0 GHz with a dual-modulus prescaler of 32/33. The device operates on a 2.7 V to 5.5 V power supply and features a separate VP pin for extended tuning voltage up to 6.0 V. Key electrical parameters include a maximum phase detector frequency of 55 MHz, typical supply current of 6.5 mA at 3 V, and selectable charge pump currents of 250 μA or 1 mA. It utilizes a 3-wire serial interface for register control.

Feature Summary

• Integrated Integer-N PLL synthesizer with 3.0 GHz RF input capability
• Dual-modulus prescaler (32/33) combined with programmable A and B counters
• Separate VP supply pin allows extended VCO tuning voltage up to 6.0 V
• Digital lock detect and Fastlock mode for rapid settling times

Applications

• Base stations for wireless radio (GSM, PCS, DCS, CDMA, WCDMA)
• Wireless handsets and mobile communication devices
• Wireless LANs and communications test equipment
• CATV equipment requiring local oscillator generation

Procurement Notes

Verify the specific suffix (e.g., BRU vs. BRUZ) against the required packaging format, as these denote different shipping containers such as tubes or reels. Confirm the temperature grade (B version for -40°C to +85°C) matches the application environment. Check current distribution availability status, as lead times may vary based on production cycles.

Selection Notes

Select the ADF4118 when the target RF frequency exceeds 1.2 GHz, distinguishing it from the ADF4117. Ensure the external VCO tuning voltage requirements are met by utilizing the VP pin if the system supply is limited to 3 V. Verify that the reference input frequency does not exceed 100 MHz and that the loop filter design accommodates the available charge pump current options.

Part Context

The ADF4118 belongs to the ADF411x family of frequency synthesizers, which also includes the ADF4116 (550 MHz) and ADF4117 (1.2 GHz). These devices share a common architecture featuring low-noise digital PFDs and precision charge pumps. The BRU designation indicates a TSSOP-16 surface-mount package suitable for automated assembly processes.

Replacement Considerations

For lower frequency requirements, the ADF4117 (1.2 GHz max) or ADF4116 (550 MHz max) may serve as alternatives. For higher frequency applications, newer generations such as the ADF4350 or ADF4151 should be evaluated for compatibility and performance improvements.