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U4280BM-BFL Datasheet(PDF) 1 Page - TEMIC Semiconductors |
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U4280BM-BFL Datasheet(HTML) 1 Page - TEMIC Semiconductors |
1 / 9 page U4280BM Preliminary Information TELEFUNKEN Semiconductors Rev. A1, 10-Apr-97 1 (9) AM / FM - PLL Description The U4280BM is an integrated circuit in BICMOS technology for frequency synthesizer. It performs all the functions of a PLL radio tuning system and is controlled by I2C bus. The device is designed for all frequency synthesizer applications of radio receivers, as well as RDS (Radio Data System) applications. Features D Frequency range up to 150 MHz D Pre-amplifier for AM and FM D Fine tuning steps: AM y 1kHz FM y 2 kHz D Two programmable 16-bit divider, adjustable from 2 to 65535 D Reference oscillator up to 15 MHz D 5 programmable switching outputs, 4 are open drain outputs up to 15 V D Phase detector with separate outputs for AM and FM D Controlled via I2C bus Ordering Information Extended Type Number Package Remarks U4280BM-B DIP20 U4280BM-BFL SO20 Block Diagram Shift register Latch Latch I2C – BUS interface AM / FM– switch Preamplifier N – Divider Analog outputs Preamplifier : 2 Lock detector Current sources Phase detector Latch Status R – Divider Switching outputs 5 678 9 PRT SWO1 SWO2 SWO3 AM/FM 14 13 16 17 15 PDFM PDAM PDFMO PDAMO LD Oscillator 18 19 OSCOUT 2 3 4 SCL SDA AS 12 AMOSC 10 FMOSC 11 GND2 20 GND1 1 V DD 13346 OSCIN Figure 1. Block diagram |
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