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UMA1015AM

Part Number	UMA1015AM
Manufacturer	NXP
Description	Low-power dual frequency synthesizer for radio communications
Published	Apr 17, 2005
Detailed Description	INTEGRATED CIRCUITS DATA SHEET UMA1015AM Low-power dual frequency synthesizer for radio communications Product speciﬁc...
Datasheet	UMA1015AM PDF File

Overview

INTEGRATED CIRCUITS DATA SHEET UMA1015AM Low-power dual frequency synthesizer for radio communications Product speciﬁcation Supersedes data of 1997 Jun 10 File under Integrated Circuits, IC17 1997 Sep 03 Philips Semiconductors Product speciﬁcation Low-power dual frequency synthesizer for radio communications FEATURES • Two fully programmable RF dividers up to 1.
1 GHz • Fully programmable reference divider up to 35 MHz • 2 : 1 or 1 : 1 ratio of selectable reference frequencies • Fast three-line serial bus interface • Adjustable phase comparator gain • Programmable out-of-lock indication for both loops • On-chip voltage doubler • Low current consumption from 3 V supply • Separate power-down mode for each synthesizer • Up to 4 open-drain output ports • Crystal input frequency signal inverted and buffered output on separate pin.
APPLICATIONS • Cordless telephone • Hand-held mobile radio.
QUICK REFERENCE DATA SYMBOL VDD1, VDD2 VCC VCCvd PARAMETER digital supply voltage CONDITIONS VDD1 = VDD2 MIN.
2.
7 2.
7 − − − − 50 3 − − −30 − − GENERAL DESCRIPTION UMA1015AM The UMA1015AM is a low-power dual frequency synthesizer for radio communications which operates in the 50 to 1100 MHz frequency range.
Each synthesizer consists of a fully programmable main divider, a phase and frequency detector and a charge pump.
There is a fully programmable reference divider common to both synthesizers which operates up to 35 MHz.
The device is programmed via a 3-wire serial bus which operates up to 10 MHz.
The charge pump currents (gains) are fixed by an external resistance at pin 20 (ISET).
The BiCMOS device is designed to operate from 2.
7 V (3 NiCd cells) to 5.
5 V at low current.
Digital supplies VDD1 and VDD2 must be at the same potential.
The charge pump supply (VCC) can be provided by an external source or on-chip voltage doubler.
VCC must be equal to or higher than VDD1.
Each synthesizer can be powered-down independently via the serial bus to save current.
It is also possible to pow...

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