ATR4256 PDF Datasheet – Frequency Synthesizer

A frequency synthesizer is an electronic circuit or system that generates a precise and stable output signal with a desired frequency. It is commonly used in a variety of applications where accurate frequency generation is required, such as communication systems, radar systems, wireless devices, and test equipment. Frequency synthesizers offer the ability to produce a wide range of frequencies while maintaining high frequency accuracy and stability.

Part Number: ATR4256

Function: Frequency Synthesizer for Radio Tuning

Package: SSOP 20 Pin type

Manufacturer: ATMEL Corporation

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The ATR4256 is a synthesizer IC for FM receivers and an AM up-conversion system in BiCMOS technology. Together with the AM/FM IC ATR4258 or ATR4255, it comprises a complete AM/FM car radio front-end, which is also recommended for RDS (Radio Data System) applications. It is controlled by a 3-wire bus and also contains switches and Digital to Analog Converters (DACs) for software-controlled alignment of the AM/FM tuner. The ATR4256 is the pin-compatible successor IC of U4256BM-R.


• Reference Oscillator up to 15 MHz (Tuned)

• Oscillator Buffer Output (for AM Up/Down Conversion)

• Two Programmable 16-bit Dividers

• Fine-tuning Steps Possible

• Fast Response Time Due to Integrated Loop Push-pull Stage

• 3-wire Bus (Enable, Clock and Data; 3V and 5V Microcontrollers Acceptable)

• Four Programmable Switching Outputs (Open Drain)

• Three DACs for Software Controlled Tuner Alignment

• Low-power Consumption

• High Signal to Noise Ratio (SNR)

• Integrated Band Gap – Only One Supply Voltage Necessary

ATR4256 datasheet pinout

ATR4256 PDF Datasheet