TRF2050

LOW-VOLTAGE 1.2-GHz FRACTIONAL-N/INTEGER-N SYNTHESIZER

SLWS030D– JUNE 1996 – REVISED OCTOBER 1998

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POST OFFICE BOX 655303

– Philips SA7025 Emulation Mode

Pin-for-Pin and Programming

Compatible

– Extended Performance Mode (EPM)

Modulus of 1–16

Compensation Charge Pumps

description

The TRF2050 is a low-voltage, low-power consumption 1.2-GHz fractional-N/integer-N frequency synthesizer

component for wireless applications. Fractional-N division and an integral speed-up charge pump are used to

achieve rapid channel switching. Two operating modes are available: 1) SA7025 emulation mode in which the

part emulates the Philips SA7025 fractional-N synthesizer and 2) extended performance mode (EPM), which

provides additional features including fractional accumulator modulos from 1 to 16 (compared to only 5 or 8 for

the SA7025) and programmable control of the speed-up mode duration (compared to the SA7025 method of

holding the strobe line high).

Along with external loop filters, the TRF2050 provides all functions necessary for voltage-controlled oscillator

(VCO) control in a dual phase-locked loop (PLL) frequency synthesizer system. A main channel is provided for

radio frequency (RF) channels and an auxiliary channel for intermediate frequency (IF) channels. The

current-output charge pumps directly drive passive resistance-capacitance (RC) filter networks to generate

VCO control voltages. Rapid main-channel frequency switching is achieved with a charge pump arrangement

that increases the current drive and alters the loop-filter frequency response during the speed-up mode portion

of the switching interval.

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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CLOCK

DATA

STROBE

RFIN

RFIN

REFIN

RA

AUXIN

TSETUP

LOCK/TEST

RF

RN

PHP

PHI

PHA

PW PACKAGE

(TOP VIEW)

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Copyright

© 1998, Texas Instruments Incorporated