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ISL5416KIZ Fiches technique(PDF) 11 Page - Intersil Corporation |
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ISL5416KIZ Fiches technique(HTML) 11 Page - Intersil Corporation |
11 / 71 page 11 NCO/Mixer After the input select/format section, the samples are multiplied by quadrature sine wave samples from the carrier NCO. The NCO has a 32-bit frequency control, providing sub-hertz resolution at the maximum clock rate. The quadrature sinusoids have exceptional purity. The purity of the NCO should not be the determining factor for the receiver dynamic range performance (A typical spectrum plot is shown in Figure 20). The phase quantization to the sine/cosine generator is 24 bits and the amplitude quantization is 19 bits. The carrier NCO center frequency is loaded via the uP bus. The center frequency control is double buffered -- the input is loaded into a holding register via the uP interface. The data is then transferred from the holding register to the active register by a write to a special address or by a SYNCInX signal, if enabled in IWA = *000h. To synchronize multiple channels, the carrier NCO phase accumulator feedback can be zeroed on loading to restart all of the NCOs at the same phase (see IWA = *005h). The phase of the NCO can be offset by programming IWA = *003h. The phase offset is not double buffered. R E G ENA ENB ENC END EN µP EXPA EXPB EXPC EXPD EXP µP AMANT BMANT CMANT DMANT µPMANT R E G R E G R E G R E G R E G FIR FILTER R E G R E G R E G 0...-15 0...-23 R E G 0...-29 0...-23 69b 62b 53b 44b 34b REG REG REG SIN/COS GEN REG REG REG REG SERIAL FREQ OFFSET COF COFSYNC ENCOF 0...-23 0...-18 R E G R E G R E G R E G C L I P R E G R E G R E G MAX EXP BASE SHIFT VALUE 0...-23 R E G R E G R E G DECIMATION COUNTER R E G R E G R E G R E G CIC ORDER FIR COEFFICIENTS 11 -1 21 -2 1 31 -3 3 -1 41 -4 6 -4 1 5 1 -5 10 -10 5 -1 CENTER FREQ PHASE OFFSET (COMB) FIGURE 3. NCO, MIXER AND CIC BLOCK DIAGRAM (from uP) NOTE: BUS NUMBERING SUCH AS 0...-23 INDICATES BIT WEIGHTS SUCH AS 20 ... 2-23 (TEST INPUT) ISL5416 |
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