hsp50214a Intersil Corporation, hsp50214a Datasheet - Page 32

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hsp50214a

Manufacturer Part Number
hsp50214a
Description
Programmable Downconverter
Manufacturer
Intersil Corporation
Datasheet
Data Ready Signal Assertion Rate:
The assertion rate of the DATARDY signal Is the data transi-
tion rate of the A
alignment of parallel data words available for output are as
follows:
DATARDY Is asserted time aligned with and at the same
rate as the data type selected for the AOUT output. Fig-
ure 31 details the timing of the AOUT and DATARDY for an
AOUT = I data selection.
NOTE: The number of PROCCLKS per output symbol is not representative, but shown to be small for clarity of establishing timing with respect
to the DATARDY signal. For each application, the relationship of the output symbol rate to PROCCLK must be properly illustrated to determine
the exact nature of the timing.
NOTE: I and Q are sample aligned in time. |r| and
I and Q are aligned in time,
|r| and ø are time aligned, but one sample clock delayed
from the associated I and Q samples.
sample is delayed in time from I or Q by 1 sample time + 63 tap FIR impulse response. If the FIR is set to decimate and frequency
is selected for AOUT, the DATARDY signal will be at the discriminator FIR output (decimated) rate.
PROCCLK
PROCCLK
PROCCLK
DATARDY
DATARDY
DATARDY
AOUT
BOUT
AOUT
BOUT
AOUT
OUT
DR0
FIGURE 32. DATARDY WAVEFORMS WHEN |r| (MAGNITUDE) IS SELECTED AS AOUT
FIGURE 33. DATARDY WAVEFORMS WHEN f (FREQUENCY) IS SELECTED AS AOUT
output data either [I, |r| or f]. The time
FIGURE 31. DATARDY WAVEFORMS WHEN I (READ DATA) IS SELECTED AS AOUT
I0
Q0
Q0
DR0
DR1
|r|0
I1
Q1
Q1
DR-1
DR1
DR2
|r|1
I2
are sample aligned in time, but one sample delayed from I or Q. The frequency
Q2
Q2
HSP50214A
1 + FIR Delay
DR2
DR3
I3
32
Q3
Q3
|r|2
Note that the BOUT data word may be at a different rate and
skewed in time with respect to DATARDY, depending on the
type of data selected for output. This is because of the timing
relationships defined above, and because the DATARDY is
driven by the AOUT signal. Figure 32 details such a configura-
tion.
When the f (frequency) word is selected for output on AOUT,
the DATARDY signal is asserted at the discriminator FIR filter
output rate, which will be a reduced rate when decimation is
engaged in the filter. The f (frequency) output is delayed
from the associated I and Q samples one sample time plus,
the discriminator FIR filter impulse response time. Figure 33
details the timing of this configuration for a FIR filter that dec-
imates by 4.
DR3
DR4
I4
Q4
Q4
|r|3
DR5
DR4
I5
|r|4
Q5
Qn
DR6
DR0
DR5
I6
Qn+1
Q6
|r|5
f0 (R = 4)
DR6
Qn+2
|r|6

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