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UAA2068, UAA2068A, UAA2068AHL

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Info of UAA2068
Info of UAA2068A
Info of UAA2068AHL

UAA2068, UAA2068A, UAA2068AHL Selling Leads, Datasheet

MFG:PHILIPS Package Cooled:650 D/C:03/04+

UAA2068, UAA2068A, UAA2068AHL Datasheet download

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Part Number: UAA2068

MFG: PHILIPS

Package Cooled: 650

D/C: 03/04+

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UAA2068AHL General Description

The UAA2068AHL BiCMOS device integrates a 950 MHz VCO, a frequency doubler, main and reference dividers and a phase comparator, to implement a phase-locked loop for DECT channel frequencies. The 1.9 GHz signal is buffered and switched, in TX mode, to drive the transmit power amplifier (CGY20xx series) or, in RX mode, to be used as an LO signal for the receiver mixer IC (UAA3540TS).

The synthesizer's main divider is driven by the frequency doubler output in the range from 1880 to 1920 MHz and programmed via a 3-wire serial bus.The reference divider ratio is fixed at 16. Outputs of the main and reference dividers drive a phase comparator where a charge pump produces phase error current pulses for integration in an external loop filter. Only a passive loop filter is necessary. The charge-pump current (phase comparator gain) is set by an external resistor (RSET) at pin RSET.

The VCO is powered from an internally regulated voltage source and includes internal varicap diodes. Its tuning range is wider than the required band to allow for production spreads. In a Time Division Multiple Access (TDMA) system such as DECT, the VCO and the synthesizer are switched on one slot before the required one to lock the VCO to the required channel frequency.Just before the required slot, the synthesizer is switched off, allowing open-loop modulation of the VCO during transmission. When opening the loop, the frequency pulling (due to switching off the synthesizer) can be maintained within the DECT specification.

The device is designed to operate from 3 NiCd cells in pocket phones, with low current and nominal 3.6 V supplies. Separate power and ground pins are provided to the different parts of the circuit. The ground leads should be short-circuited externally to prevent large currents flowing across the die and thus causing damage.

All supply pins (V_CC) must also be at the same potential,except V_CC(CP) which can be equal to or greater than the other supply pins (e.g. V_CC = 3 V and V_CC(CP) = 5 V for wider V_CO control voltage range).

UAA2068AHL Maximum Ratings

SYMBOL	PARAMETER	CONDITIONS	MIN.	MAX.	UNIT
V_CC	supply voltage		-0.3	+5.5	V
V_CC(CP)	charge-pump supply voltage		-0.3	+5.5	V
V_CC(CP)-V_CC	difference in voltage between V_CC(CP) and V_CC		-0.3	+5.5	V
GND	difference in ground supply voltage applied between all ground pins	note 1	-	0.3	V
P_tot	total power dissipation		-	275	mW
T_stg	storage temperature		-55	+125
T_amb	operating ambient temperature		-10	+60
T_j	junction temperature		-	150

Note
1. Pins short-circuited internally must be short-circuited externally.

UAA2068AHL Features

· Economical integrated solution for frequency generation in DECT cordless telephones
· Integrated low phase noise 950 MHz VCO with frequency doubler
· Local Oscillator (LO) drive (-14 dBm) for RF mixer circuit
· Dedicated DECT PLL synthesizer
· 3-line serial interface bus
· 3 dBm output preamplifier with an integrated switch
· Low current consumption from 3 V supply
· Compatible with Philips Semiconductors ABC baseband chip (PCD509x series)

UAA2068AHL Typical Application

· 1880 to 1920 MHz DECT cordless telephones.

UAA2068AHL Connection Diagram

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