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SLWS132 Datasheet(PDF) 38 Page - Texas Instruments |
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SLWS132 Datasheet(HTML) 38 Page - Texas Instruments |
38 / 46 page GRAYCHIP, INC. - 33 - APRIL 27, 1999 GC4014 QUAD RECEIVER CHIP DATA SHEET REV 0.6 This document contains information which may be changed at any time without notice The suggested GSM control register settings for the chip with an input sample rate of 54.166 MHz (N=25) is shown in Table 12 (other input rates can be used up to 62.5 MHz, 54.166 is used as an example): The variables SCALE, BIG_SCALE (address 4) and G (address 16HEX of pages 4,5,6,and 7) are set as follows. The values of SCALE and BIG_SCALE must be set to satisfy: . N is 25, so (4log2N) is 37.14. This means , which is satisfied by setting SCALE=1 and BIG_SCALE=6. SCALE, however, needs to be decreased to 0 to prevent overflow in the CFIR, which has a gain of 1.97. The overall gain is set using “G” according to: Where COARSE is 0 and PFIR_SUM is 125151. The optimal setting of GAIN is 2.0 in order to compensate for the loss in the tuning process (See Section 7.9). A value of G=46 (2EHEX) will give a gain of 2.015. The output serial format is set in address 6 to have a bit rate of one half the chip’s clock rate and to be used in the packed mode. The user will need to configure the output format as is necessary for the application. Table 11: GSM Configuration Control Registers Channel pages 4,5,6,7 Coefficient Pages Address Data Address Data Page 8 Page 9 Page 10 Page 11 00 (HEX) 65 (HEX)1 10 (HEX) FREQ[0:7] EF F1 74 66 01 80->822 11 FREQ[8:15] 03 FD 08 F5 02 19 12 FREQ[16:23] C3 CD D5 86 03 00 13 FREQ[24:31] F8 FA 07 00 04 60 14 00 (HEX) 4F 52 CB A3 05 00 15 00 00 FA 05 0F 06 11 16 2E 0F C1 3D A9 07 00 17 00 07 FB 00 20 08 50 18 5F 61 2F 24 86 09 55 19 06 FD F9 32 0A FF 1A A7 6B C2 71 0B FF 1B 01 FF F3 42 0C 08 1C 09 F0 8F 6D 0D 1P3 1D 01 03 F0 4C 0E 00 1E AF C1 50 81 0F read only 1F 00 07 F0 4F 1. Initialize to 65 while configuring the chip(s), then set to E5, then back to 65 to fire off the one-shot sync.This assumes that SO is tied to SI 2. Initialize to 80, then set to 82 after external coefficients are loaded. 3. “P” is the page number. The upper nibble should stay at “1¨. SCALE 6 BIG_SCALE × + () 56 4log 2N – () ≤ SCALE 6 BIG_SCALE × + () 37 ≤ GAIN 25 4 2 36 56 – () {} 2COARSE [] 1.97 {} PFIR_SUM 65536 ------------------- {} G 32 ------ 0.0438G == |
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