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UAA2068AHL Datasheet(PDF) 6 Page - NXP Semiconductors |
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UAA2068AHL Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 20 page  1999 Jun 04 6 Philips Semiconductors Product specification Transmit chain and synthesizer with integrated VCO for DECT UAA2068AHL Fig.2 Pin configuration. handbook, full pagewidth UAA2068AHL FCA070 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 DATA VCC(SYD) SYDGND XTAL VCC(SYA) SYAGND CPGND CP VCC(VCO) VMOD VCOA VREG VCGND VCOB VTUNE VCOGND FUNCTIONAL DESCRIPTION Transmit chain VCO, BUFFER AND FREQUENCY DOUBLER The VCO operates at a nominal centre frequency of 950 MHz. The VCO is fully integrated apart from two inductors which complete the resonator network. The VCO operates from an on-chip regulated power supply (VREG), which minimizes frequency disturbances due to variations in supply voltage. The buffered VCO signal is fed into a frequency doubler. The large difference between the transmitted and VCO frequencies reduces transmitter oscillator coupling problems. The output of the doubler is used to drive the synthesizer main divider and can also be switched to either the TX preamplifier or the RX LO output buffer. The high isolation obtained from the VCO buffer and the frequency doubler ensures that very small frequency changes occur when turning on the TX preamplifier or the RX LO output buffer. In TX mode, the oscillator can be directly modulated with GMSK filtered data at pin VMOD. RF SWITCH The RF switch passes the doubled VCO signal to either the TX preamplifier (when T_EN is HIGH) or to the RX LO buffer (when T_EN is LOW). In TX mode, the difference in the RF power levels, observed at the TX output when T_EN is switched from LOW-to-HIGH, is typically 40 dB. TX PREAMPLIFIER The TX preamplifier amplifies the RF signal up to a level of 3 dBm which is suitable for use with Philips Semiconductors DECT power amplifiers such as the CGY20xx series. It is powered-up when both R_OFF and VCO_ON are HIGH. RX LO BUFFER The RX LO buffer outputs the frequency doubled VCO signal at a level of −14 dBm. This signal can then be used as the local oscillator drive for the receive mixers of devices such as the UAA3540TS. The buffer is powered-up when R_OFF is LOW and VCO_ON is HIGH. |
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