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PLL for AM/FM Radio

>> BCT2634S

BCT2634S

Frequency Synthesizer for AM/FM Electronic Tuning with DC/DC converter

General Description

The BCT2634S is a frequency synthesizer digital PLL chip used for electronic tuning at 3 Volt AM & FM radios with on-chip, inductor-based DC/DC converter. A regulated high voltage output for tuning diode can be easily built by employing BCT2634S together with external power transistor. A high impedance MOS amplifier is integrated to easy the loop filter design and BCT2634S is designed to work from 1.8V to 3.6V supply voltage. The BCT2634S is made using advanced CMOS process for low voltage, low power and low radiation operations.

Features

Low supply voltage: from 1.8 to 3.6V
On-chip DC/DC boost regulator for tuning diode.
High speed programmable frequency divider
- FMIN : 10 to 180 MHz
- AMIN : 2 to 40 MHz (MW)
- IFIN : 0.4 to 12 MHz
Seven Reference Frequency Selectable:
1 kHz, 3 kHz, 3.125 kHz, 5 kHz, 6.35 kHz,12.5 kHz and 25 kHz. ( reference to 75kHz low radiation oscillator)
Three State Phase Detector: with Built-in unlock detection circuit
Built-in Linear MOS input amplifier for forming an active low pass filter
5 Dedicated Output Ports
3 Wire Serial Data Input : CE, CK and DA
Pb-free SSOP24 package

Applications

AM / MW / FM radio tuner
Radio tuner module
PLL frequency synthesizers

Package

Typical Application Circuit

Product Overview Downaload [pdf]

Full Datasheer Download [pdf]