Analog Devices Inc. ADF4113BCP

Overview

ADF4113BCP from Analog Devices is a 4.0 GHz RF PLL frequency synthesizer IC used as a local oscillator in up/downconversion stages of wireless transceivers. It features dual-modulus prescaler (8/9 to 64/65), programmable charge pump current (up to 5 mA), 3-wire serial interface, and operates from 2.7 V to 5.5 V supply. It enables precise frequency synthesis in GSM, WCDMA, and wireless LAN base stations.

For engineers reviewing the ADF4113BCP datasheet, ADF4113BCP pinout, ADF4113BCP application, or ADF4113BCP equivalent, key selection considerations include its 4.0 GHz RF input range, 200 MHz max prescaler output frequency at 5 V, −100 dBc reference spurs at 900 MHz, integrated phase-frequency detector with lock detect, and LFCSP-20 package compatibility with high-density RF layouts.

Technical Context

The ADF4113BCP implements a digital phase-frequency detector (PFD) and precision charge pump driving an external loop filter and VCO. Its N-divider uses 13-bit B and 6-bit A counters with dual-modulus prescaler (P/P+1), enabling integer-N synthesis where N = BP + A. The 14-bit R counter supports programmable reference input frequencies from 5 MHz to 104 MHz.

It supports both analog and digital lock detection, hardware/software power-down modes, and separate VP supply (up to 6.0 V) for extended tuning voltage in 3 V systems. Charge pump current is set via external RSET resistor (2.7 kΩ–10 kΩ), delivering ±625 µA to ±5 mA with 2% sink/source matching and 2.5% absolute accuracy.

Key Specifications

Pinout & Package

ADF4113BCP is housed in a 20-lead LFCSP (Lead Frame Chip Scale Package) with exposed paddle, requiring soldering of the EPAD to AGND for thermal and electrical integrity. Package dimensions: 4 mm × 4 mm × 0.85 mm (body), 0.5 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PLL synthesizer applications.

Compared with ADF4113BCP, ADF4153A offers higher frequency headroom and improved noise but requires SPI redesign; LMX2531 trades off max frequency and discrete VCO flexibility for integration and footprint reduction - neither is pin-compatible, and all require loop filter re-optimization.

Availability

ADF4113BCP is available at Aetrix Electronics and suitable for wireless infrastructure, cellular handset RF front-ends, and communications test equipment requiring stable component supply with guaranteed long-term availability.

Supply support for ADF4113BCP includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and RF ICs, headquartered in Norwood, MA, serving industrial, communications, automotive, and aerospace markets since 1965.

The ADF411x family was designed specifically for cost-effective, high-reliability integer-N PLL synthesis in wireless infrastructure and portable radio applications - emphasizing low power, flexible prescaling, and robust lock detection.

FAQ

What is the maximum RF input frequency supported by the ADF4113BCP?

The ADF4113BCP supports an RF input frequency range of 0.2 GHz to 4.0 GHz when driven at −5 dBm input level. At lower input levels (e.g., −10 dBm), the upper limit drops to 3.7 GHz. This 4.0 GHz rating enables direct synthesis for LTE Band 40 (2.3 GHz), Band 41 (2.5 GHz), and unlicensed 5 GHz WLAN bands without requiring external prescaling.

How does the separate VP supply pin improve system design with the ADF4113BCP?

The VP pin on the ADF4113BCP accepts a supply up to 6.0 V, independent of AVDD/DVDD (2.7–5.5 V). This allows 3 V systems to deliver up to 6 V tuning voltage to external VCOs - eliminating level-shifters or charge pumps in wide-tuning-range applications such as broadband synthesizers or multiband front-ends.

Can the ADF4113BCP generate fractional-N frequencies?

No, the ADF4113BCP is an integer-N PLL synthesizer only. It lacks a sigma-delta modulator or fractional divider; frequency resolution is limited to fREFIN/R, where R is the programmable 14-bit reference divider. For fractional-N capability, consider Analog Devices' ADF415x or ADF435x families instead of the ADF4113BCP.

What is the purpose of the MUXOUT pin on the ADF4113BCP?

The MUXOUT pin on the ADF4113BCP is a configurable diagnostic output that can be programmed to provide lock detect status, a divided-by-16 version of the RF input, or a divided-by-R version of the reference input. This enables real-time PLL health monitoring and simplifies debug without requiring additional probing or external dividers.

Does the ADF4113BCP require external passive components to operate?

Yes - the ADF4113BCP requires an external loop filter between CP and the VCO tuning port, a resistor (RSET) from RSET to CPGND to set charge pump current, and decoupling capacitors on AVDD, DVDD, and VP. It also needs ac-coupling capacitors on RFINA/RFINB and REFIN, plus proper RF grounding of the exposed paddle per Analog Devices' layout guidelines.