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UAA2077 Datasheet(PDF) 6 Page - NXP Semiconductors |
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UAA2077 Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 16 page  1995 Dec 13 6 Philips Semiconductors Product specification 2 GHz image rejecting front-end UAA2077BM Local oscillator section The local oscillator (LO) input directly drives the two internal all-pass networks to provide quadrature LO to the receive mixers. The centre frequency of the receive band is adjustable by the voltage on pin VQUADLO. This should be achieved by connecting a resistor between VQUADLO and VCC. Over 25 dB of image rejection can be obtained by an optimum resistor value. A synthesizer-ON mode (SX mode) is used to power-up all LO input buffers, thus minimizing the pulling effect on the external VCO when entering the receive or transmit mode. This mode is active when SXON = 1. Transmit mixer This mixer is used for down-conversion to the transmit IF. Its inputs are coupled to the transmit RF which is down-converted to a modulated transmit IF frequency, phase-locked with the baseband modulation. The IF outputs are high-impedance (open-collector type). Typical application will load the output with a differential 500 Ω load; for example, a 500 Ω resistor load, connected to VCC for DC path, at each TX output, plus a differential 1k Ω consisting of the input impedance of the matching network for the following TX part. The mixer can also be used for frequency up-conversion. Fast switching ON/OFF, of the transmit section is controlled by the hardware input TXON. Fig.4 Block diagram, LO section. handbook, halfpage MGD156 LOINB to TX to RX LOINA QUAD VQUADLO LOGND VCCLO Fig.5 Block diagram, transmit mixer. handbook, halfpage MGD153 TXINA TXINB TXON LOIN TX MIXER TXOA TXOB Table 1 Control of power status EXTERNAL PIN LEVEL CIRCUIT MODE OF OPERATION TXON RXON SXON LOW LOW LOW power-down mode LOW HIGH LOW RX mode, fLO <fRF: receive section and LO buffers to RX on HIGH LOW LOW TX mode: transmit section and LO buffers to TX on LOW LOW HIGH SX mode: complete LO section on LOW HIGH HIGH SRX mode, fLO <fRF: receive section on and SX mode active HIGH LOW HIGH STX mode: transmit section on and SX mode active HIGH HIGH LOW RX mode, fLO >fRF: receive section and LO buffers to RX on HIGH HIGH HIGH SRX mode, fLO >fRF: receive section on and SX mode active |
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Similar Description - UAA2077 |
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