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參數(shù)資料
型號(hào): AFE7222EVM
廠商: Texas Instruments
文件頁(yè)數(shù): 28/106頁(yè)
文件大小: 0K
描述: EVAL MODULE FOR AFE7222
標(biāo)準(zhǔn)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
SLOS711B – NOVEMBER 2011 – REVISED MARCH 2012
Register Name – CONFIG18 – Address 0x117 Default = 0x00 (Synced)
<7>
<6>
<5>
<4>
<3>
<2>
<1>
<0>
TX_NCO_FREQ_WORD(31:24)
TX_NCO_FREQ_WORD(31:24) – See CONFIG21 below.
Register Name – CONFIG19 – Address 0x118 Default = 0x00 (Synced)
<7>
<6>
<5>
<4>
<3>
<2>
<1>
<0>
TX_NCO_FREQ_WORD(23:16)
TX_NCO_FREQ_WORD(23:16) – See CONFIG21 below.
Register Name – CONFIG20 – Address 0x119 Default = 0x00 (Synced)
<7>
<6>
<5>
<4>
<3>
<2>
<1>
<0>
TX_NCO_FREQ_WORD(15:8)
TX_NCO_FREQ_WORD(15:8) – See CONFIG21 below.
Register Name – CONFIG21 – Address 0x11A Default = 0x00 (Synced)
<7>
<6>
<5>
<4>
<3>
<2>
<1>
<0>
TX_NCO_FREQ_WORD(7:0)
TX_NCO_FREQ_WORD(7:0) – This is used to determine the frequency, Fmix of the NCO. The twos
complement formatted value can be positive or negative, and the LSB is equal to Fs/232
Register Name – CONFIG22 – Address 0x11B Default = 0x00 (Synced)
<7>
<6>
<5>
<4>
<3>
<2>
<1>
<0>
TX_NCO_PHASE_OFF(15:8)
TX_NCO_FREQ_WORD(15:8) – See CONFIG23 below.
Register Name – CONFIG23 – Address 0x11C Default = 0x00 (Synced)
<7>
<6>
<5>
<4>
<3>
<2>
<1>
<0>
TX_NCO_PHASE_OFF(7:0)
TX_NCO_PHASE_OFF(7:0) – This is the 2s complement Phase offset added to the NCO accumulator
just before the generation of the SIN and COS values.
Register Name – CONFIG24 – Address 0x11D, Default = 0x00
<7>
<6>
<5>
<4>
<3>
<2>
<1>
<0>
TX_MIXER_EN
TX_MIXER_GAIN(1:0)
TX_MIXER_GAIN(1:0) – The fine mixer realizes the functions {Acos(
ωmixt) – B sin(ωmixt)} and {Asin(ωmixt)
+ Bcos(
ωmixt)} This can cause the fine mixer output to be up to 3 dB higher than the individual inputs.The
mixer gain can restore the signal level to the desired level by providing a programmable attenuation.
VALUE
GAIN
0
–2.5 dB (default) – use when complex mixing
1
–6 dB
2
0 dB – use when one input is zero
3
0 dB
TX_MIXER_EN – This enables the fine mixer, which also causes the NCO to be enabled.
28
REGISTER DESCRIPTIONS
Copyright 2011–2012, Texas Instruments Incorporated
Product Folder Link(s): AFE7222 AFE7225
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