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SA604A Datasheet(PDF) 11 Page - NXP Semiconductors |
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SA604A Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 31 page SA604A All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved. Product data sheet Rev. 4.1 — 30 March 2015 11 of 31 NXP Semiconductors SA604A High-performance low-power FM IF system 13.1 Circuit description The SA604A is a very high gain, high frequency device. Correct operation is not possible if good RF layout and gain stage practices are not used. The SA604A cannot be evaluated independent of circuit, components, and board layout. A physical layout which correlates to the electrical limits is shown in Figure 17. This configuration can be used as the basis for production layout. The SA604A is an IF signal processing system suitable for IF frequencies as high as 21.4 MHz. The device consists of two limiting amplifiers, quadrature detector, direct audio output, muted audio output, and signal strength indicator (with log output characteristic). The equivalent circuit is shown in Figure 4. Figure 7 is the performance of the typical cellular radio application shown in Figure 6 with 45 MHz RF input and 455 kHz IF. Audio output: C message weighted; 0 dB reference = recovered audio for 8 kHz peak deviation (dB) Fig 7. Performance of the typical cellular radio application AUDIO RSSI (VOLTS) THD + NOISE NOISE AM (80 % MOD) aaa-012849 10 −120 −80 1 2 3 4 −60 −40 −20 (dB) NOISE AM (80 % MOD) THD + NOISE RSSI (V) −100 −80 −60 −40 −20 100 1 k SA604A IF INPUT (μV) (1500 Ω) SA602A RF INPUT (dBm) (50 Ω) 100 k 10 k 0 |
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