UMA1021 datasheet(2/16 Pages) PHILIPS

2 / 16 page

1998 Nov 19

Philips Semiconductors

Product speciﬁcation

Low-voltage frequency synthesizer for

radio telephones

UMA1021AM

FEATURES

• Low phase noise

• Low current from 3 V supply

• Fully programmable main divider

• 3-line serial interface bus

• Independent fully programmable reference divider,

driven from external crystal oscillator

• Hard and soft power-down control.

APPLICATIONS

• 900 MHz and 2 GHz mobile telephones

• Portable battery-powered radio equipment.

GENERAL DESCRIPTION

The UMA1021AM BICMOS device integrates a prescaler,

programmable dividers, and a phase comparator to

implement a phase-locked loop.

The device is designed to operate from 3 NiCd cells, in

pocket phones, with low current and nominal 3 V supplies.

The synthesizer operates at RF input frequencies

up to 2.2 GHz with a fully programmable reference divider.

All divider ratios are supplied via a 3-wire serial

programming bus.

Separate power and ground pins are provided to the

analog (charge pump) and digital circuits. The ground

leads should be externally short-circuited to prevent large

currents flowing across the die and thus causing damage.

VDD1 and VDD2 must also be at the same potential (VDD).

VCC must be equal to or greater than VDD for wider control

range of the Voltage Controlled Oscillator (VCO),

e.g. VDD = 3 V and VCC =5V.

The charge pump current (phase detector gain) is fixed by

an external resistor at pin ISET and controlled via the serial

interface. Only a passive loop filter is necessary; the

charge pump functions within a wide voltage compliance

range to improve the overall system performance.

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

VDD1, VDD2

digital supply voltage

VDD1 =VDD2 =VDD

2.7

−

5.5

VCC

analog supply voltage for charge pump VCC ≥ VDD

2.7

−

5.5

Itot

total supply current (IDD +ICC)VCC =VDD = 5.5 V

−

Itot(pd)

total supply current in Power-down

mode (IDD +ICC)

logic levels 0 V or VDD

−

−µA

fRF

RF input frequency

300

−

2200

MHz

fxtal

crystal reference oscillator input

frequency

−

MHz

fph(comp)

phase comparator frequency

−

200

−

kHz

Tamb

operating ambient temperature

−30

−

+85

°C

TYPE NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

UMA1021AM

SSOP16

plastic shrink small outline package; 16 leads; body width

4.4 mm

SOT369-1

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