U4285BM-MFS

U4285BM-MFS Datasheet


The U4285BM is an integrated circuit in BICMOS technology for frequency synthesizers. It performs all the functions of a PLL radio tuning system and is controlled by a 2-wire bus. The device is designed for all frequency synthesizer applications in radio receivers, as well as for RDS Radio Data System applications.

Part Datasheet
U4285BM-MFS U4285BM-MFS U4285BM-MFS (pdf)
Related Parts Information
U4285BM-MFSG3 U4285BM-MFSG3 U4285BM-MFSG3
PDF Datasheet Preview
• Reference Oscillator up to 15 MHz
• Two Programmable 16-bit Dividers Adjustable from 2 to 65535
• Fine Tuning Steps

AM 1 kHz FM 2 kHz
• Four Programmable Switching Outputs Open Drain up to 15 V
• Integrated Loop-push-pull Stage for AM/FM
• High Signal/Noise Ratio

AM/FM PLL with 4 Switches

The U4285BM is an integrated circuit in BICMOS technology for frequency synthesizers. It performs all the functions of a PLL radio tuning system and is controlled by a 2-wire bus. The device is designed for all frequency synthesizer applications in radio receivers, as well as for RDS Radio Data System applications.

U4285BM

Figure Block Diagram

OSCIN 18

OSCOUT 19 SCL 2 SDA 3 AS 4

Oscillator

Bus interface

FMOSC 9

AMOSC 11

AM/FM switch
10 GND2

R-divider

SWO1 SWO2 SWO3 SWO4

Switching outputs

Phase detector

Current sources

N-divider
1 VDD
20 GND1
14 PDAM
15 PDAMO 16

VA 17

PDFMO
13 PDFM

Pin Configuration

Figure Pinning SSO20

VDD 1 SCL 2
20 GND1 19 OSCOUT

SDA 3
18 OSCIN

SWO1 5
16 VA

U4285BM

SWO2 6
15 PDAMO

SWO3 7
14 PDAM

SWO4 8
Ordering Information

Extended Type Number U4285BM-MFS U4285BM-MFSG3

Package SSO20 plastic SSO20 plastic

Remarks Taping according to IEC-286-3

Package Information

Package SSO20

Dimensions in mm
technical drawings according to DIN specifications

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Datasheet ID: U4285BM-MFS 519497