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| 型號： | AFE7222EVM |
| 廠商： | Texas Instruments |
| 文件頁數： | 82/106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： | 否 |
| 已用 IC / 零件： | AFE7222 |
| 已供物品： | 板 |
| 其它名稱： | 296-30300 AFE7222EVM-ND |
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SLOS711B – NOVEMBER 2011 – REVISED MARCH 2012
9.12 TRANSMIT 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.
9.13 TRANSMIT COARSE FREQUENCY MIXER
The transmit path contains an optional ±FDACCLK/4 coarse digital frequency mixer. An example of its use is
the processing of an input pattern to the AFE7225/7222 at or near baseband. The digital mixer can move
the carrier or block of carriers to a higher IF after interpolation. This is useful especially in quadrature
modulation as it creates more separation between the wanted signal and its image, making it easier to
filter the unwanted image at RF after the analog quadrature modulator.
MIXING MODE
MIXING
MIXING PATTERN(1)
Iout = { +A, +A , +A, +A }
00
Normal (Low Pass, No Mixing)
Qout = { +B, +B , +B, +B }
Iout = { +A, –A , +A, –A }
01
High Pass (Fs/2)
Qout = { +B, –B , +B, –B }
Iout = { +A, –B , –A, +B }
10
+Fs/4
Qout = { +B, +A , –B, –A }
Iout = { +A, +B , –A, –B }
11
–Fs/4
Qout = { +B, –A , –B, +A }
(1)
A and B are the inputs to the CMIX block. Iout and Qout are the outputs.
9.14 TRANSMIT INVERSE SINC FILTER
The inverse SINC filter is 9-tap and has a response that is inverse of the natural DAC droop versus
frequency (due to sin(x)/x roll-off caused by zero-order hold of DAC sampling. It uses the same
coefficients as in DAC5688. The inverse sinc filter has a gain > 1 at all frequencies. Therefore, the signal
input to the inverse SINC must be reduced from full scale to prevent saturation in the filter. The amount of
backoff required depends on the signal frequency, and is set such that at the signal frequencies the
combination of the input signal and filter response is less than 1 (0dB). For example, if the signal input to
the inverse SINC filter is at FDACCLK/4, the response of the inverse SINC is 0.9 dB, and the signal must be
backed off from full scale by 0.9 dB. The gain function in the QMC block can be used to reduce the
amplitude of the input signal. The coefficients are same as those in the inverse SINC filter in DAC5688
(listed only up to the middle one).
Coefficients = [ 1 –4 13 –50 592 ]
Its frequency response is shown below:
Copyright 2011–2012, Texas Instruments Incorporated
APPLICATION INFORMATION
77
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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 |
| AFE7225 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Analog Front End Wideband Mixed-Signal Transceiver |
| 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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