Overview
The ADF4252BCP-REEL7 is a dual fractional-N/integer-N frequency synthesizer produced by Analog Devices Inc. This device is designed to implement local oscillators (LO) in the upconversion and downconversion sections of wireless receivers and transmitters. It features a low noise digital phase frequency detector (PFD), a precision charge pump, and programmable reference dividers. The synthesizer includes a Σ-Δ-based fractional interpolator for the RF synthesizer and programmable integer-N counters for the IF synthesizer. Control of all on-chip registers is via a simple 3-wire serial interface. The device operates with a power supply ranging from 2.7 V to 3.3 V and includes a power-down mode for energy efficiency.
Key Specifications
| Parameter | Value |
|---|---|
| Frequency Range (RF Synthesizer) | Up to 3.0 GHz (fractional-N), up to 1.2 GHz (integer-N) |
| Power Supply | 2.7 V to 3.3 V |
| Package Type | LFCSP-24-WQ (4x4 mm) |
| Interface | 3-wire serial interface |
| Charge Pump Current | Programmable via external resistor |
| Operating Temperature | -40°C to +85°C |
| Reference Input Voltage | CMOS input with nominal threshold of VDD/2 |
Key Features
- Dual fractional-N/integer-N frequency synthesizer
- Low noise digital phase frequency detector (PFD) and precision charge pump
- Σ-Δ-based fractional interpolator for RF synthesizer and programmable integer-N counters for IF synthesizer
- 3-wire serial interface for register control
- Power-down mode for reduced power consumption
- Digital lock detect and programmable modulus on fractional-N synthesizer
- Trade-off between noise and spurious performance
Applications
- Base stations for mobile radio (GSM, PCS, DCS, CDMA, WCDMA)
- Wireless handsets (GSM, PCS, DCS, CDMA, WCDMA)
- Wireless LANs
- Communications test equipment
- CATV equipment
Q & A
- What is the frequency range of the ADF4252BCP-REEL7?
The ADF4252BCP-REEL7 has a frequency range of up to 3.0 GHz for the fractional-N synthesizer and up to 1.2 GHz for the integer-N synthesizer. - What is the power supply range for this device?
The device operates with a power supply ranging from 2.7 V to 3.3 V. - What type of interface does the ADF4252BCP-REEL7 use?
The device uses a 3-wire serial interface for controlling the on-chip registers. - Can the charge pump current be adjusted?
Yes, the charge pump current is programmable via an external resistor. - What are the key applications of the ADF4252BCP-REEL7?
The key applications include base stations for mobile radio, wireless handsets, wireless LANs, communications test equipment, and CATV equipment. - Does the ADF4252BCP-REEL7 have a power-down mode?
Yes, the device includes a power-down mode to reduce power consumption when not in use. - What is the package type of the ADF4252BCP-REEL7?
The package type is LFCSP-24-WQ (4x4 mm). - How is the reference input voltage configured?
The reference input is a CMOS input with a nominal threshold of VDD/2. - What is the operating temperature range of the ADF4252BCP-REEL7?
The operating temperature range is -40°C to +85°C. - Does the ADF4252BCP-REEL7 support digital lock detect?
Yes, the device supports digital lock detect.
