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TH71112ENE Datasheet(PDF) 4 Page - Melexis Microelectronic Systems |
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TH71112ENE Datasheet(HTML) 4 Page - Melexis Microelectronic Systems |
4 / 22 page TH71112 868/915MHz FSK/FM/ASK Receiver 39010 71112 Page 4 of 22 Data Sheet Rev. 013 June/07 1.3 Block Diagram Fig. 1: TH71112 block diagram 1.4 Mode Configurations ENRX Mode Description 0 RX standby RX disabled 1 RX active RX enable Note: ENRX are pulled down internally 1.5 LNA GAIN Control VGAIN_LNA Mode Description < 0.8 V HIGH GAIN LNA set to high gain > 1.4 V LOW GAIN LNA set to low gain Note: hysteresis between gain modes to ensure stability 1.6 Frequency Planning Frequency planning is straightforward for single-conversion applications because there is only one IF that can be chosen, and then the only possible choice is low-side or high-side injection of the LO signal (which is now the one and only LO signal in the receiver). The receiver’s double-conversion architecture requires careful frequency planning. Besides the desired RF input signal, there are a number of spurious signals that may cause an undesired response at the output. Among them are the image of the RF signal (that must be suppressed by the RF front-end filter), spurious signals injected to the first IF (IF1) and their images which could be mixed down to the same second IF (IF2) as the desired RF signal (they must be suppressed by the LC filter at IF1 and/or by low-crosstalk design). MIX2 MIX1 12 IN_LNA LNA 4 3 31 2 8 5 67 11 IF2 13 17 27 28 26 IF1 10 9 LO2 LO1 25 1 BIAS 30 VCO1 DIV16 DIV2 PFD RO 22 RO LF 29 CP 32 18 19 OAP OAN OUT_OA OA 20 14 15 16 23 24 OUTP OUTN MIX3 IFA 21 |
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