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UMA1015AM

Low-power dual frequency synthesizer for radio communications

Philips Electronics 

Philips Semiconductors

Low-power dual frequency synthesizer

for radio communications

Product specification

UMA1015AM

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.

GENERAL DESCRIPTION

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

power-down the device via the HPD input (pin 5).

QUICK REFERENCE DATA

SYMBOL

VDD1, VDD2

VCC

PARAMETER

digital supply voltage

charge pump supply voltage

VCCvd

charge pump supply from

voltage doubler

IDD1 + IDD2 + ICC operating supply current

IDDpd + ICCpd

IDDpd

fRF

fXTALIN

fpc(min)

fpc(max)

Tamb

total current in power-down

mode

current in power-down mode

from supply VDD1 and VDD2

RF input frequency for each

synthesizer

crystal input frequency

minimum phase comparator

frequency

maximum phase

comparator frequency

operating ambient

temperature

CONDITIONS

VDD1 = VDD2

external supply; doubler

disabled; VCC ≥ VDD

doubler enabled

both synthesizers ON; doubler

disabled; VDD1 = VDD2 = 3 V

doubler disabled;

VDD1 = VDD2 = 3 V

doubler enabled;

VDD1 = VDD2 = 3 V

MIN.

2.7

2.7

−

−

−

−

50

3

−

−

−30

TYP.

−

−

MAX. UNIT

5.5 V

6.0 V

2VDD1 − 0.6 6.0 V

8.7

−

mA

3

−

µA

0.25

−

mA

−

1100 MHz

−

35 MHz

10

−

kHz

750

−

kHz

−

+85 °C

1997 Sep 03

2

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