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CLC5526PCASM Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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CLC5526PCASM Datasheet(HTML) 8 Page - National Semiconductor (TI) |
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8 / 10 page  Applications (Continued) any stray parasitic impedance into a resonant circuit. By tun- ing the resonant load, full gain can be achieved with a given resistive load. A typical tuned load is shown below in Figure 3, where the resonant frequency is tuned about 150 MHz. The 1000 Ω load in this circuit can represent the input imped- ance of the CLC5956 Analog to Digital converter. Actual val- ues for the reactive components may vary slightly to account for board and device parasitic elements. Typical Application Although the CLC5526 can be used as a general purpose digital variable gain amplifier, it was specifically designed to provide the variable gain function in National’s Diversity Re- ceiver Chipset. In this application, the CLC5526 drives a tuned BPF and the CLC5956 Analog to Digital converter. Digitized IF data is downsampled and tuned with the CLC5902 dual digital tuner which also provides the AGC control function. AGC data is fed back to the CLC5526. The CLC5956 differential input impedance is 1000 Ω, so with the tuned load, full gain of the CLC5526 is achieved. Figure 4 shows the block diagram of the Diversity Receiver Chipset application. Figure 5 shows the SINAD vs Input Power of the diversity receiver chipset. For input power levels ranging from 0 dB to −110 dB, the chip set provides a signal to noise ratio in excess of the 9 dB required for a typical GSM system. Layout Considerations A proper printed circuit layout is essential for achieving high frequency performance. National Semiconductor provides evaluation boards for the CLC5526, which include input and output transformers for impedance matching and single to differential signal conversion. Supply bypassing is required for best performance. Provide a 6.8 µF Tantalum and 0.1 µF ceramic capacitor as close as possible to the supply pin. In addition, a 100 pF ceramic capacitor should be placed be- tween the COMP pin (pin 9) and the system ground. This will filter high frequency noise from the common-mode level. Ceramic coupling capacitors should be used to AC couple both the input and output. Actual values will depend upon the signal frequency. DS015016-19 FIGURE 3. CLC5526 Driving a Tuned Load DS015016-20 FIGURE 4. Diversity Receiver Chipset Block Diagram DS015016-21 FIGURE 5. Diversity Receiver Chipset SINAD vs Input Power www.national.com 8 |
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