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UAA2068 Datasheet(PDF) 2 Page - NXP Semiconductors |
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UAA2068 Datasheet(HTML) 2 Page - NXP Semiconductors |
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2 / 20 page  1998 Nov 19 2 Philips Semiconductors Product specification Transmit chain and synthesizer with integrated VCO for DECT UAA2068G 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). APPLICATIONS • 1880 to 1920 MHz DECT cordless telephones. GENERAL DESCRIPTION The UAA2068G 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 (UAA2078). 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 8. 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 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 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 (VCC) must also be at the same potential, except VCC(CP) which can be equal to or greater than the other supply pins (e.g. VCC = 3 V and VCC(CP) = 5 V for wider VCO control voltage range). ORDERING INFORMATION TYPE NUMBER PACKAGE NAME DESCRIPTION VERSION UAA2068G LQFP32 plastic low profile quad flat package; 32 leads; body 5 × 5 × 1.4 mm SOT401-1 |
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Similar Description - UAA2068 |
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