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參數資料
型號: AFE7222EVM
廠商: Texas Instruments
文件頁數: 76/106頁
文件大小: 0K
描述: EVAL MODULE FOR AFE7222
標準包裝: 1
主要目的: 接口,模擬前端(AFE)
嵌入式:
已用 IC / 零件: AFE7222
已供物品:
其它名稱: 296-30300
AFE7222EVM-ND
20
0
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-180
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Normalized Frequency
Frequency Response of Decimation Filter
Frequency
Response(dB)
SLOS711B – NOVEMBER 2011 – REVISED MARCH 2012
RXFIR (decimation filter)
coefficients = [+9 0 –33 0 +88 0 –196 0 +387 0 –704 0 +1210 0 –2024 0 +3432 0 –6485 0 +20700
+32768]
The frequency response of the filter is shown below.
Figure 9-2. Decimation Filter Frequency Response (from 0 to FADCCLK/2)
9.5
RECEIVE FINE FREQUENCY MIXER (FMIX)
The fine mixer uses a Numerically Controlled Oscillator (NCO) to generate two complementary outputs of
a finely programmable frequency, which is then mixed with the A and B inputs to generate complex
outputs.
The mixer computes two outputs as follows:
Output I = {Acos(
ωmixt) – B sin(ωmixt)} and
Output Q = {Asin(
ωmixt) + Bcos(ωmixt)}
where
ωmix is the programmed fine frequency.
The NCO has a 32 bit frequency register, and a 20 bit phase register. The 32 bit frequency register can be
used to set the mixing frequency over a range of ±Fs/2 in steps of Fs/232.
9.6
RECEIVE COARSE FREQUENCY MIXER (CMIX)
The receive path contains an optional ±FADCCLK/4 coarse digital frequency mixer. An example of its use is
the capture of an IF centered in the middle of a Nyquist band. The digital mixer can move the carrier or
block of carriers to baseband or near baseband. If the total bandwidth of the carrier or summation of
carriers is less than 0.4 × FADCCLK/4, the decimation filter can also be employed.
The CMIX block does a complex mixing on the A and B channels as shown below. The SYNC pin can be
used to ensure that across chips, the phase of mixing is maintained.
Copyright 2011–2012, Texas Instruments Incorporated
APPLICATION INFORMATION
71
Product Folder Link(s): AFE7222 AFE7225
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AFE7222IRGC25 功能描述:射頻前端 Dual 12B,65MSPS ADC RoHS:否 制造商:Skyworks Solutions, Inc. 類型: 工作頻率:2.4 GHz, 5 GHz 最大數據速率:54 Mbps 噪聲系數: 工作電源電壓:3.3 V 電源電流:180 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-32
AFE7222IRGCR 功能描述:射頻前端 Dual 12B,65MSPS ADC RoHS:否 制造商:Skyworks Solutions, Inc. 類型: 工作頻率:2.4 GHz, 5 GHz 最大數據速率:54 Mbps 噪聲系數: 工作電源電壓:3.3 V 電源電流:180 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-32
AFE7222IRGCT 功能描述:射頻前端 Dual 12B,65MSPS ADC RoHS:否 制造商:Skyworks Solutions, Inc. 類型: 工作頻率:2.4 GHz, 5 GHz 最大數據速率:54 Mbps 噪聲系數: 工作電源電壓:3.3 V 電源電流:180 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-32
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AFE7225EVM 功能描述:射頻開發工具 AFE7225 Eval Mod RoHS:否 制造商:Taiyo Yuden 產品:Wireless Modules 類型:Wireless Audio 工具用于評估:WYSAAVDX7 頻率: 工作電源電壓:3.4 V to 5.5 V
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