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AN95102 Datasheet Preview

AN95102 Datasheet

Low Power Single/Dual Ferquency Synthesizers

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Philips Semiconductors
Low power single/dual frequency synthesizers:
UMA1017M/1018M/1019M(AM)/1020M(AM)
Application note
AN95102
Author: P. Hugues
UMA1018M and UMA1020M/UMA1020AM low power dual frequency synthesizers
UMA1017M and UMA1019M/UMA1019AM low power single frequency synthesizers
SUMwMwAwR.dYatasheet4u.com
This application note describes the UMA1018M and
UMA1020M/UMA1020AM from Philips Semiconductors. They
permit a low-voltage low-power single-chip solution to designing
dual PLL frequency synthesizers. They are intended for use in
digital or analogue wireless communications equipment. Typical
applications include GSM, DECT and DCS1800.
Three low-voltage low-power solutions to single frequency
synthesizers are also briefly described. The UMA1017M and
UMA1019M/UMA1019AM are derivatives from UMA1018M and
UMA1020M, respectively, and are hence closely related.
The overall performance of any PLL frequency synthesizer system
is critically determined by the low pass filter used. Described in this
report is a basic loop filter design method with worked examples and
some measurement results.
1. INTRODUCTION TO UMA1018M DUAL
SYNTHESIZER
1.1 General description
The UMA1018M [1] is a low power low voltage single chip solution
to a dual frequency synthesizer used in radiocommunications.
Designed in a BICMOS process, it operates from 2.7 (3 NiCd cells)
to 5.5 V. The UMA1018M contains all the necessary elements with
the exception of the VTCXO, VCO and loop filters to build two PLL
frequency synthesizers.
It is intended that the principal synthesizer operates in the 50 to
1250 MHz range, and the auxiliary synthesizer will work between 20
and 300 MHz. For each synthesizer, fully programmable main and
reference dividers are integrated on chip. The reference input
FXTAL can operate from 5 to 40 MHz. Fast programming is
possible via the three wire serial bus with clock speeds of up to 10
MHz.
The principal synthesizer phase detector drives a low current charge
pump and a high current charge pump simultaneously. Maximum
output current is 0.4 mA with the low current charge pump (pin CPP)
and 3.2 mA with the other (pin CPPF). The auxiliary phase detector
drives only one charge pump. The programmable charge pump
currents are fixed by an external resistance Rext at pin lSET. Only
passive loop filters are necessary.
To reduce crosstalk between different parts of the synthesizer,
separate power supply and ground pins are provided to the
analogue and digital sections.
Each synthesizer can be powered down independently to save
current via software programming or hardwire pins AON / PON.
An on-chip 7 bit DAC allows adjustment of external functions, such
as temperature compensation of the VTCXO, power amplifier
control, etc.
1.2 FEATURES
Dual frequency synthesizers
Operating voltage range 2.7 to 5.5 V for battery powered
operation
Low current consumption, 10 mA typically at 5.5 V (two PLLs
enabled)
Integrated fully programmable main divider for each synthesizer
Principal: 512 to 131,071 up to 1.25 GHz input
Auxiliary: 64 to 16,383 up to 300 MHz input
Independent fully programmable reference divider for each
synthesizer
Principal: 8 to 2074 up to 2 MHz output
Auxiliary: 8 to 2047 up to 1 MHz output
3-wire serial bus (Data, Clock, Enable) for fast programming
(fmax = 10 MHz)
Independent hardwire and software power down modes for both
synthesizers
Simple passive loop filters
Charge pump output current under bus control, with reference
current ISET set by an external reference resistor Rext
Programmable out-of-lock detector
Integrated D-to-A converter
Small SSOP-20 package
1995 Oct 10
906 Revision of AN94002




Philips

AN95102 Datasheet Preview

AN95102 Datasheet

Low Power Single/Dual Ferquency Synthesizers

No Preview Available !

Philips Semiconductors
Low power single/dual frequency synthesizers:
UMA1017M/1018M/1019M(AM)/1020M(AM)
www.datasheet4u.com
Application note
AN95102
Figure 1–1. UMA1018M Block Diagram
1.3 Typical Application Architecture
UMA1018M integrated circuit is typically used in digital
radiotelephone systems like GSM. It is designed to meet the
requirements of these systems; low noise (residual and spurious),
fast switching and low current consumption (at 5.5 V: 10 mA with
both synthesizers ON and 36 µA with both synthesizers OFF).
Figure 1–1 demonstrates a typical application. UMA1018M is
integrated on a dual superheterodyne architecture using two local
oscillators.
1995 Oct 10
Figure 1–2. UMA1018M: Typical Application Block Diagram
907


Part Number AN95102
Description Low Power Single/Dual Ferquency Synthesizers
Maker Philips
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