參數(shù)資料
型號(hào)： ISL5416EVAL1
廠商： Intersil Corporation
英文描述： Four-Channel Wideband Programmable DownConverter
中文描述： 四通道可編程寬帶下變頻器
文件頁數(shù)： 21/71頁
文件大?。?/td> 1128K
代理商： ISL5416EVAL1
21
additional 0 to 3 input samples as programmed by the user.
This additional depth provides for additional programmable
group delay. The additional FIFO depth can only be
programmed at reset. Because the NCOs are enabled after
a depth of 2 is reached, the data into the IHBF/Resampler is
zeroed until the programmed fill depth is reached. If both the
half-band and resampling filters are enabled, the
programmable FIFO depth, together with the NCO2 phase
offset, provides from 0 to 4 FIR2 output sample periods of
programmable group delay in 1/512 increments.
Because the IHBF and RS combination can only interpolate,
for resampling ratios <1, the signal must first be interpolated
to a multiple of the desired sample rate and then decimated
to the final rate. A decimation counter is provided after the
resampling filter to down sample to the desired rate.
The NCO1 and NCO2 frequencies are programmed in IWA =
*011h - *014h. These registers are double buffered. The uP
writes to a holding register. Data is then transferred to the
active registers by a write to IWA = *017h or by a SYNCInX if
enabled in IWA = *000h.
The gain data from the AGC is not interpolated. The output
of the AGC is sampled with each I/Q sample to the output
section.
R
E
G
R
E
G
R
E
G
R
E
G
R
E
G
R
E
G
R
E
G
R
E
G
R
E
G
R
E
G
R
E
G
R
E
G
R
E
G
R
E
G
M
R
FIFO
IHBF
M
FRACTIONAL
RESAMPLING
INTERPOLATION
FILTER
0...-15
WR
RD
DEPTH =
2 + (0 to 3)
SAMPLES
DIVIDE
BY
1 OR 2
REG
Σ
LEAP
COUNTER
REG
Σ
PHASE OFFSET
0 TO 511/256 SAMPLES
Fclk
NCO2
CO
NCO1
N x Fout
EN
DIVIDE
BY N
Fout
Fihbf_out
Fihbf_in
FILL DEPTH BEFORE
ENABLING READS
0, 1, 2, or 3
FIGURE 8. IHBF AND RESAMPLER BLOCK DIAGRAM
ISL5416
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參數(shù)描述
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