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HSP50216 Datasheet(PDF) 9 Page - Intersil Corporation |
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HSP50216 Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 58 page 9 FN4557.6 August 17, 2007 Level Detector An input level detector is provided to monitor the signal level on any of the input busses. Which input bus, the input format, and the level detection type are programmable (see Microprocessor Interface section, Table 39, “INPUT LEVEL DETECTOR SOURCE SELECT/FORMAT REGISTER (GWA = F804h),” on page 44, Table 40, “INPUT LEVEL DETECTOR CONFIGURATION REGISTER (GWA = F805h),” on page 45 and Table 41, “INPUT LEVEL DETECTOR START STROBE REGISTER (GWA = F806h),” on page 45). This signal level represents the wideband signal from the A/D and is useful for controlling gain/attenuation blocks ahead of the converter. The supported monitoring modes are: integrated magnitude (like the HSP50214 without the threshold), leaky integration (Yn =Xn xA +Yn-1 x (1-A)) where A = 1, 2 -8, 2-12, or 2-16 (see GWA = F805h), and peak detection. The measurement interval can be programmed from 2 to 65537 samples (or continuous for the leaky integrator and peak detect cases). The output is 32 bits and is read via the μP interface. 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. 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 μP bus. The center frequency control is double buffered - the input is loaded into a center frequency holding register via the μP interface. The data is then transferred from the holding register to the active register by a write to a address IWA *006h or by a SYNCI signal, if loading via SYNCI is enabled. 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. A serial offset frequency input is also available for each channel through the D(15:0) parallel data input bus (if that bus is not needed for data input). This is legacy support for HSP50210 type tracking signals. See IWA = *000 and *004 for carrier offset frequency parameters. After the mixers, a PN (pseudonoise) signal can be added to the data. This feature is provided for test and to digitally reduce the input sensitivity and adjust the receiver range (sensitivity). The effect is the same as increasing the noise figure of the receiver, reducing its sensitivity and overall dynamic range. For testing, the PN generator provides a wideband signal which may be used to verify the frequency response of a filter. The one bit PN data is scaled by a 16-bit programmable scale factor. The overall range for the PN is 0 to 1/4 full scale (see IWA = *001h). A gain of 0 disables the PN input. The PN value is formed as where S is the PN generator output bit (treated as a sign bit) and the 16 X’s refer to the PN Gain Register IWA = *001h. The minimum, non-zero, PN value is 2-18 of full scale (-108dBFS) on each axis (-105dBFS total). For an input noise level of -75dBFS, this allows the SNR to be decreased in steps of 1/8dB or less. The I and Q PN codes are offset in time to decorrelate them. The PN code is selected and enabled in the test control register (F800h). The PN is added to the signal after the mix with the three sign bits aligned with the most significant three bits of the signal, so the maximum level is -12dBFS and the minimum, non-zero level is -108dBFS. The PN code can be 215-1, 223-1 or 215-1 * 223-1. 14-BIT MODE: 14-BIT MANTISSA, 2-BIT EXPONENT, 12dB EXPONENT RANGE EXPONENT GAIN (dB) PIN BIT WEIGHTING TO 16-BIT INPUT MAPPING 00 0 X15 X15 X15 X14 X13 X12 X11 X10 X9X8X7X6 X5X4X3X2 01 6 X15 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 X2 0 10 (Note 5) 12 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 X2 0 0 NOTE: 5. Or 11, the exponent input saturates at 10. PN Value 2-3 2-4 . .... ... .... 2-17 2-18 SSS X X XX XXX XXXX XXX X X HSP50216 |
Similar Part No. - HSP50216_07 |
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Similar Description - HSP50216_07 |
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