參數(shù)資料
型號(hào)： HSP50214AVC
廠商： HARRIS SEMICONDUCTOR
元件分類(lèi)： 通信及網(wǎng)絡(luò)
英文描述： Programmable Downconverter
中文描述： SPECIALTY TELECOM CIRCUIT, PQFP120
文件頁(yè)數(shù)： 24/60頁(yè)
文件大?。?/td> 467K
代理商： HSP50214AVC
24
The prototype polyphase filter has 192 taps designed at 32
times the input sample rate. Each of the 32 phases has 6 fil-
ter taps (6)(32) = 192. The stopband attenuation of the pro-
totype filter is greater than 60dB, as shown in Figure 24. The
signal to total image power ratio is approximately 55dB, due
to the aliasing of the interpolation images. The filter is capa-
ble of decimation factors from 1 to 4. If the output is at least
2x the baud rate, the 32 interpolation phases yield an effec-
tive sample rate of 64x the baud rate or approximately 1.5%,
(1/64), maximum timing error.
Following the Re-sampler are two interpolation halfband fil-
ters. The halfband filters allow the user to up-sample by 2 or
4 to recover time resolution lost by decimating. Interpolating
by 2 or 4 gives 1/4 or 1/8 baud time resolution (assuming 2x
baud at the re-sampler output). The halfband filters use the
same coefficients as HB3 and HB5 from the Halfband Filters
Section. If one halfband is used, the 23-tap filter is chosen. If
two are used, the 23-tap filter runs first followed by the
15-tap filter operating at twice the first halfband’s rate. The
23-tap filter requires 7 multiplies, and the 15-tap filter
requires 5 multiplies to complete a filter calculation.
Using the interpolation halfband filters allows for reduction in
the FIR filter sample rate. This optimizes the use of the pro-
grammable FIR filter by allowing the FIR output sample rate
to be closer to the Nyquist rate of the desired bandwidth.
Optimizing the FIR filter performance provides better use of
the programmable FIR taps. Table 10 details the maximum
clocking rates for the possible resampling and interpolation
halfband filter configurations of this section of the PDC. Con-
trol Word 16, Bits 2-0 identify the filter configuration. Control
Word 16, Bit 3 is used to bypass the polyphase re-sampler
filter.
For proper data output from the interpolation filters, the data
ready signal must account for the interpolation process. Fig-
ure 25 illustrates the insertion of additional data ready
pulses to provide sufficient pulses for the new output sample
rate. The Re-sampler Output Pulse Delay parameter is set in
Control Word 16, Bits 4-11. These bits set the delay between
the output samples when interpolation is utilized. Program
this distance between pulses using
A value of at least 5 is required to have sufficient time to
update the Output Buffer Register. (Writing 5 samples
requires 5 clock cycles) A value of at least 16 is required for
proper serial output from the part. (Conversion from 16-bit
parallel to serial). The value is programmed in numbers of
PROCCLK’s.
(EQ. 20)
N
f
PROCCLK
/f
OUT
(
)
1
]
–
[
=
FIGURE 24A. POLYPHASE RESAMPLER FILTER BROADBAND
FREQUENCY RESPONSE
FIGURE 24B. POLYPHASE RESAMPLER FILTER PASS BAND
FREQUENCY RESPONSE
0
-20
-40
-60
-80
-100
-120
M
1
2
3
4
FREQUENCY (RELATIVE TO f
IN
)
5
6
7
8
9
10 11 12 13 14 15 16
10
0
-10
-20
-30
-40
-50
-60
-70
-80
M
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
FREQUENCY (RELATIVE TO f
IN
)
0
HSP50214A
相關(guān)PDF資料
PDF描述
HSP50214AVI Programmable Downconverter
HSP50214B Programmable Downconverter
HSP50214BVC Programmable Downconverter
HSP50214BVI Programmable Downconverter
HT84 ADSL Coupling Transformers
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HSP50214AVI 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Programmable Downconverter
HSP50214B 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Programmable Downconverter
HSP50214B_07 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Programmable Downconverter
HSP50214BVC 功能描述:上下轉(zhuǎn)換器 120L MQFP COMTEMP 14-BIT PROGRAMMABLE DOWNCONVERTER 65MSPS RoHS:否 制造商:Texas Instruments 產(chǎn)品:Down Converters 射頻:52 MHz to 78 MHz 中頻:300 MHz LO頻率: 功率增益: P1dB: 工作電源電壓:1.8 V, 3.3 V 工作電源電流:120 mA 最大功率耗散:1 W 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-128
HSP50214BVCZ 功能描述:上下轉(zhuǎn)換器 120L MQFP COMTEMP 14-BIT PROG DWNCNVRT RoHS:否 制造商:Texas Instruments 產(chǎn)品:Down Converters 射頻:52 MHz to 78 MHz 中頻:300 MHz LO頻率: 功率增益: P1dB: 工作電源電壓:1.8 V, 3.3 V 工作電源電流:120 mA 最大功率耗散:1 W 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-128
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