參數(shù)資料
型號(hào)： HSP50214B
廠商： Intersil Corporation
英文描述： Programmable Downconverter
中文描述： 可編程變頻器
文件頁(yè)數(shù)： 44/60頁(yè)
文件大?。?/td> 573K
代理商： HSP50214B
3-44
Applications
Composite Filter Response Example
For this example consider a total receive band roughly
25MHz wide containing 124 200kHz wide FDM channels as
shown in Figure 47. The design goal for the PDC is to tune to
and filter out a single 200kHz FDM channel from the FDM
band, passing only baseband samples onto the baseband
processor at a multiple of the 270.8 KBPS bit rate.
RF/IF Considerations
The input frequency to the PDC is dependent on the A/D
converter selected, the RF/IF frequency, the bandwidth of
interest and the sample rate of the converter. If the A/D
converter has sufficient bandwidth, then undersampling
techniques can be used to downconvert IF/RF frequencies
as part of the digitizing process, using the PDC to process a
lower frequency alias of the input signal.
For example, a 70MHz IF can be sampled at 40MHz and the
resulting 10MHz signal alias can be processed by the PDC
to perform the desired downconversion/tuning and filtering. If
the IF signal is less than 1/2 the sample frequency then
standard oversampling techniques can be used to process
the signal. Of the two techniques, only undersampling allows
part of the down conversion function to be brought into the
digital domain just through sampling, assuming that a
sampling frequency can be found that keeps the alias
signals low and that the A/D converter has the bandwidth to
accept the unconverted analog signal.
101
AGC Data
andTiming
Error
AGC(mustwritetolocation10tosam-
ple)
000- AGC LSB (lower 8 bits of linear
Control Word 3 used by multiplier)
mmmmmmmm LSB.
001- AGC MSB (4 shift control bits
and first three bits of linear) Control
Word oeeeemmm MSB. This yields
11 bits of the linear control mantissa.
010- Timing error LSB, not stabi-
lized.
011- Timing error MSB, not stabi-
lized.
110
Not Used
111
Not Used
Don’t Care
Status
111- Status (6:0) consisting of
(6:4)-FIFO depth when output is in
FIFO Buffer RAM Output Mode.
(3)-EMPTY signalling the FIFO is
empty and the read pointer cannot
be advanced (Active High).
(2)-FULL signalling the FIFO is full
and new samples will not be written
(Active High).
(1)-READYB Output buffer has
reached the programmed threshold
in FIFO mode or the programmed
numberofsampleshavebeentaken
in snapshot mode. (Active Low).
(0)-INTEGRATION has been com-
pleted in the input level detector and
is ready to be read. (Active High).
TABLE 22. DEFINITION OF ADDRESS MAP (Continued)
READ
CODE C(2:0)
STATUS
TYPE
READ ADDRESS A(2:0)
FIGURE 47. RECEIVE SIGNAL FREQUENCY SPECTRUM
FREQUENCY
FREQUENCY
124 CHANNELS
200kHz
CHANNEL
HSP50214B
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HSP50214B_07 制造商:INTERSIL 制造商全稱(chēng):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
HSP50214BVI 功能描述:上下轉(zhuǎn)換器 120L MQFP INDTEMP 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
HSP50214BVIZ 功能描述:上下轉(zhuǎn)換器 120L MQFP INDTEMP 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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