U4256BM-R datasheet(1/19 Pages) ATMEL

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U4256BM-R Datasheet(PDF) 1 Page - ATMEL Corporation

Part #	U4256BM-R

Description	Frequency Synthesizer for Radio Tuning

PDF	19 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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1 / 19 page

Features

• 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; 3 V and 5 V Microcontrollers Acceptable)

• Four Programmable Switching Outputs (Open Drain)

• Three DACs for Software Controlled Tuner Alignment

• Low-power Consumption

• High S/N Ratio

• Integrated Band Gap – only One Supply Voltage Necessary

Description

The U4256BM-R is a synthesizer IC for FM receivers and an AM up-convertion

system in BICMOS technology. Together with the AM/FM IC T4258 or U4255BM, it

performs a complete AM/FM car radio front-end, which is recommended also 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 U4256BM-R is the pin-compatible succesor IC of U4256BM-N.

Pin Configuration

Figure 1. Pinning SSO20

Frequency

Synthesizer for

Radio Tuning

U4256BM-R

Preliminary

Rev. 4562C–AUDR–08/04

Manufacturer	Part #	Datasheet	Description
TEMIC Semiconductors	U4256BM-AFS	322Kb / 14P	Frequency Synthesizer for Radio Tuning
TEMIC Semiconductors	U4256BM-AFSG3	322Kb / 14P	Frequency Synthesizer for Radio Tuning

Manufacturer	Part #	Datasheet	Description
NXP Semiconductors	SAA1057	104Kb / 13P	Radio tuning PLL frequency synthesizer November 1983
NXP Semiconductors	TSA6060	236Kb / 16P	Fast radio tuning PLL frequency synthesizer 1995 Nov 23
Sanyo Semicon Device	LC72135M	469Kb / 24P	PLL Frequency Synthesizer for Electronic Tuning?
	LC72136	370Kb / 23P	PLL Frequency Synthesizer for Electronic Tuning
	LC72136N	319Kb / 23P	PLL Frequency Synthesizer for Electronic Tuning
	LC72137	351Kb / 23P	PLL Frequency Synthesizer for Electronic Tuning
	LC72146	357Kb / 21P	PLL Frequency Synthesizer for Electronic Tuning
TEMIC Semiconductors	U4256BM	322Kb / 14P	Frequency Synthesizer for Radio Tuning
ATMEL Corporation	ATR4256	522Kb / 21P	Frequency Synthesizer for Radio Tuning
ATMEL Corporation	U4256BM	167Kb / 14P	Frequency Synthesizer for Radio Tuning

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