Philips Semiconductors
Dual low-power frequency synthesizer
Preliminary specification
UMA1005T
FEATURES
• Fast locking by ‘Fractional-N’ divider
• Auxiliary synthesizer
• Digital phase comparator with proportional and integral
charge pump output
• High-speed serial input
• Low-power consumption
• Programmable charge pump currents
• Supply voltage range 2.9 to 5.5 V.
APPLICATIONS
• Mobile telephony
• Portable battery-powered radio equipment.
GENERAL DESCRIPTION
The UMA1005T is a low-power, high-performance dual
frequency synthesizer fabricated in CMOS technology.
Fractional-N division with selectable modulo 5 or 8 is
implemented in the main synthesizer.
The detectors and charge pumps are designated to
achieve 10 to 5000 kHz channel spacing using
fractional-N decreases the channel spacing by a factor
5 or 8. Together with an external standard 2, 3 or 4 ratio
prescaler the main synthesizer can operate in the GHz
frequency range.
Channel selection and programming is realized by a
high-speed 3-wire serial interface.
ORDERING INFORMATION
TYPE NUMBER
UMA1005T
NAME
SSOP20
PACKAGE
DESCRIPTION
plastic shrink small outline package; 20 leads; body width 4.4 mm
VERSION
SOT266-1
November 1994
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