參數(shù)資料
型號(hào): AFE7222IRGC25
廠商: Texas Instruments
文件頁數(shù): 76/106頁
文件大?。?/td> 0K
描述: IC AFE 12BIT 65/130MSPS 64VQFN
標(biāo)準(zhǔn)包裝: 1
位數(shù): 12
通道數(shù): 4
功率(瓦特): 610mW
電壓 - 電源,模擬: 2.85 V ~ 3.6 V
電壓 - 電源,數(shù)字: 1.7 V ~ 1.9 V
封裝/外殼: 64-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 64-VQFN 裸露焊盤(9x9)
包裝: 標(biāo)準(zhǔn)包裝
其它名稱: 296-30067-6
20
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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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