HSP50214BVCZ Intersil, HSP50214BVCZ Datasheet - Page 33

• Manufacturer Part Number: HSP50214BVCZ
• Description: IC DOWNCONVERTER 14BIT 120-MQFP
• Manufacturer: Intersil

Specifications of HSP50214BVCZ

• Function: Downconverter
• Rf Type: AMPS, CDMA, GSM, TDMA
• Package / Case: 120-MQFP, 120-PQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Data Ready Signal Assertion Rate:
The assertion rate of the DATARDY signal Is the data
transition rate of the A
time alignment of parallel data words available for output are
as follows:
• I and Q are aligned in time,
• |r| and ø are time aligned, but one sample clock delayed
DATARDY Is asserted time aligned with and at the same
rate as the data type selected for the AOUT output.
Figure 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
from the associated I and Q samples.
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
FIGURE 31. DATARDY WAVEFORMS WHEN I (READ DATA) IS SELECTED AS AOUT
output data either [I, |r| or f]. The
I0
Q0
Q0
33
DR0
DR1
|r|0
I1
Q1
Q1
φ
DR-1
DR1
are sample aligned in time, but one sample delayed from I or Q. The frequency sample
DR2
|r|1
I2
Q2
Q2
HSP50214B
1 + FIR Delay
DR2
DR3
I3
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
configuration.
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)S 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 decimates 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
May 1, 2007
FN4450.4