ADF4112BCPZ-RL7

Overview

The ADF4112BCPZ-RL7 is an Integer-N RF PLL frequency synthesizer from Analog Devices, designed for local oscillator implementation in wireless systems. It operates with a maximum RF input frequency of 3.0 GHz and supports power supplies ranging from 2.7 V to 5.5 V. The device features a low-noise digital phase-frequency detector, a precision charge pump, and programmable dual-modulus prescalers (8/9, 16/17, 32/33, 64/65). It includes separate analog/digital supplies and a dedicated charge pump supply (VP) to extend tuning voltage capabilities. Typical operating current is 6.5 mA at 5 V, housed in a 20-pin LFCSP package.

Feature Summary

• Maximum RF input frequency of 3.0 GHz with programmable dual-modulus prescaler options.
• Separate charge pump supply (VP) allows extended tuning voltage up to 6.0 V in 3 V systems.
• Programmable charge pump currents and antibacklash pulse width via 3-wire serial interface.
• Integrated analog and digital lock detect with hardware and software power-down modes.

Applications

• Base stations for wireless radio (GSM, PCS, DCS, CDMA, WCDMA)
• Wireless handsets (GSM, PCS, DCS, CDMA, WCDMA)
• Communications test equipment

Procurement Notes

Verify the B version industrial temperature rating (-40°C to +85°C) and LFCSP-20 packaging against design requirements. Confirm that the VP pin supply voltage does not exceed 6.0 V relative to ground. Ensure proper ESD handling procedures are followed during assembly due to the device's sensitivity.

Selection Notes

Select this component when an RF input frequency up to 3.0 GHz is required. Ensure the external loop filter and VCO are compatible with the programmable charge pump range (up to 5 mA typ). Verify that the system can accommodate the separate VP supply if extended VCO tuning voltage is needed.

Part Context

This part belongs to the ADF4110 family, which includes the ADF4110 (550 MHz), ADF4111 (1.2 GHz), and ADF4113 (4.0 GHz). All members share similar architectures and interfaces but differ in maximum RF input frequencies and associated performance specifications.

Replacement Considerations

ADF4110BCPZ-RL7, ADF4111BCPZ-RL7, ADF4113BCPZ-RL7

FAQ

What is the maximum allowable prescaler output frequency?

The maximum allowable prescaler output frequency is 165 MHz at 3 V and 200 MHz at 5 V.

How is the charge pump current set?

The charge pump current is set by connecting a resistor between the RSET pin and CPGND. With RSET = 4.7 kΩ, the typical maximum current is 5 mA.

Can the device operate with a single supply?

Yes, AVDD and DVDD must be the same value (2.7 V to 5.5 V). However, the VP pin can be supplied separately up to 6.0 V to extend the tuning voltage range.