Analog Devices Inc. ADF4110BCPZ-RL7

Overview

ADF4110BCPZ-RL7 from Analog Devices is a 550 MHz RF PLL frequency synthesizer IC used as a local oscillator in wireless transceiver up/downconversion stages. It features a 24-bit programmable N-divider (N = BP + A), 14-bit R counter, dual-modulus prescaler (8/9, 16/17, 32/33, 64/65), 3-wire serial interface, and analog/digital lock detect - enabling precise frequency synthesis for GSM/PCS base station transmitters.

For engineers reviewing the ADF4110BCPZ-RL7 datasheet, ADF4110BCPZ-RL7 pinout, ADF4110BCPZ-RL7 application, or ADF4110BCPZ-RL7 equivalent, key selection criteria include its 550 MHz RF input range, 2.7–5.5 V dual-supply operation, programmable charge pump current (625 µA to 5 mA), separate VP supply for extended tuning voltage, and industrial temperature range (−40°C to +85°C).

Technical Context

The ADF4110BCPZ-RL7 implements a digital phase-frequency detector (PFD) with precision charge pump, programmable A (6-bit) and B (13-bit) counters, and dual-modulus prescaler to realize integer-N synthesis. Its N-divider architecture (N = BP + A) supports fine frequency resolution when paired with an external loop filter and VCO.

It operates with independent analog (AVDD) and digital (DVDD) supplies tied at same voltage (2.7–5.5 V), while VP (≥ AVDD, ≤ 6.0 V) powers the charge pump to enable >3 V tuning range in 3 V systems. Lock detection is provided via both analog comparator and digital logic outputs.

Key Specifications

Pinout & Package

ADF4110BCPZ-RL7 uses a 16-lead LFCSP (3 mm × 3 mm, 0.5 mm pitch) with exposed paddle connected to AGND. Pin functions are electrically and thermally optimized for RF PLL applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADF4110BCPZ-RL7, ADF4111BCPZ-RL7 extends usable frequency range without altering design infrastructure, while LMX2531LQ1725E/NOPB trades external component flexibility for integration and superior noise performance - demanding full system requalification.

Availability

ADF4110BCPZ-RL7 is available at Aetrix Electronics and suitable for GSM base station transmitters, wireless handsets, and communications test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADF4110BCPZ-RL7 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, serving industrial, communications, automotive, and healthcare markets since 1965.

The ADF4110 family was designed specifically for cost-sensitive, high-volume wireless infrastructure and handset applications requiring robust integer-N PLL performance with minimal external components.

FAQ

What is the maximum RF input frequency supported by the ADF4110BCPZ-RL7?

The ADF4110BCPZ-RL7 supports an RF input frequency range of 50 MHz to 550 MHz at 3 V supply, with −15 dBm minimum sensitivity. At 5 V, the range remains 50–550 MHz but sensitivity improves to −10 dBm. This makes the ADF4110BCPZ-RL7 ideal for GSM 900 MHz transmitter LO generation (using divide-by-2 VCO) and other sub-600 MHz infrastructure applications.

Does the ADF4110BCPZ-RL7 require an external VCO, and why?

Yes, the ADF4110BCPZ-RL7 requires an external VCO because it is a PLL core IC - containing only the PFD, charge pump, dividers, and control logic. The CP output drives an external loop filter that conditions the tuning voltage applied to a discrete or module-based VCO. This architecture allows designers to select VCOs optimized for frequency range, phase noise, and power - a key advantage in multi-band base station designs where ADF4110BCPZ-RL7 serves as the programmable frequency engine.

How does the separate VP supply pin benefit RF system design with the ADF4110BCPZ-RL7?

The VP pin on the ADF4110BCPZ-RL7 allows the charge pump to operate at up to 6.0 V independently of the 2.7–5.5 V AVDD/DVDD rails. In a 3 V system, this enables a 0–6 V tuning voltage range for wideband VCOs - significantly extending frequency coverage without requiring charge pump boosting circuitry. This capability directly improves system-level flexibility and reduces bill-of-materials complexity in GSM/PCS infrastructure designs.

Can the ADF4110BCPZ-RL7 generate frequencies below 50 MHz, and what constraints apply?

The ADF4110BCPZ-RL7 can synthesize frequencies below 50 MHz only if the RF input slew rate exceeds 30 V/µs (at 3 V) or 50 V/µs (at 5 V), as specified in the datasheet. Below 50 MHz, the prescaler may fail to lock reliably without sufficient edge speed. Therefore, direct use below 50 MHz is not recommended; instead, designers should employ a higher-frequency VCO with division or consider the ADF4112/ADF4113 for wider low-end coverage via improved prescaler architecture.

What is the function of the MUXOUT pin on the ADF4110BCPZ-RL7, and how is it configured?

The MUXOUT pin on the ADF4110BCPZ-RL7 is a programmable diagnostic output that can be configured to provide lock detect, scaled RF input (÷16 or ÷32), or scaled reference input (÷2 or ÷4). Configuration is done via bits in Register 0 (M0–M2). This feature enables real-time PLL health monitoring without additional test equipment - for example, routing lock detect to an FPGA GPIO for automated calibration sequences in ADF4110BCPZ-RL7-based wireless transceivers.