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參數資料
| 型號： | AFE7222EVM |
| 廠商： | Texas Instruments |
| 文件頁數： | 23/106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
Register Name – CONFIG3 – Address 0x106, Default = 0x00
<7>
<6>
<5>
<4>
<3>
<2>
<1>
<0>
FIR2B_MODE
FIR1B_MODE
FIR2A_MODE
FIR1A_MODE
TX_INT_MODE_SRC
TX_INT_MODE(1:0)
TX_INT_MODE(1:0) – Specifies the interpolation factor. To use this mode, set TX_INT_MODE_SRC to 1.
VALUE
INTERPOLATION FACTOR
0
1
2
4
3
4
While interpolating by a factor of 2, the DAC_DCLKIN rate should be set to half of the DAC_CLK rate.
While interpolating by a factor of 4, the DAC_DCLKIN rate should be set to one fourth of the DAC_CLK
rate. In interpolate by 2 mode , TxFIR1 alone is used. In Interpolate by 4 mode, both TxFIR1, and TxFIR2
are used.
TX_INT_MODE_SRC – Needs to be set to 1 when programming TX_INT_MODE(1:0)
FIR1A_MODE – Specifies whether TxFIR1 in Channel A is in low pass or high pass mode . Set this bit to
configure the filter in high pass mode. In interpolate by 4 mode, always set TxFIR1 to low pass mode.
FIR2A_MODE – Specifies whether TxFIR2 in Channel A is in low pass or high pass mode. Set this bit to
configure the filter in high pass mode
FIR1B_MODE – Specifies whether TxFIR1 in Channel B is in low pass or high pass mode. Set this bit to
configure the filter in high pass mode
FIR2B_MODE – Specifies whether TxFIR2 in Channel B is in low pass or high pass mode . Set this bit to
configure the filter in high pass mode
Register Name – CONFIG4 – Address 0x107, Default = 0x00
<7>
<6>
<5>
<4>
<3>
<2>
<1>
<0>
TX_CMIX_PHASE(1:0)
TX_CMIX_PHASE_INCR
TX_CMIX_MODE(1:0)
TX_CMIX_EN
TX_CMIX_EN – Enables the Tx Coarse Mixer.
TX_CMIX_MODE (1:0) – Specifies the mode in which the TX CMIX is configured. Set TX_CMIX_EN for
this to take effect.
VALUE
MIXING MODE
0
Normal(Low pass )
1
Fs /2 (High Pass ) – real mixing mode
2
+ Fs/4 – complex mixing mode
3
– Fs/4 – complex mixing mode
TX_CMIX_PHASE_INCR – This bit is a method to control the mixing phase without using the SYNC pin. A
0 to 1 transition on this bit causes the phase of mixing in the TX CMIX to be incremented by 1 with respect
to the current phase of mixing. To increment the phase of mixing more than once, clear and then set this
bit once again. Syncing needs to be disabled for Tx CMIX for this mode to work. (This means that global
syncing should be disabled, and CMIX-specifc syncing should also be disabled).
TX_CMIX_PHASE (1:0) – The value programmed into this is applied as the current TX CMIX phase,
when the CMIX is synced, Syncing needs to be enabled for CMIX for this mode to work. This mode is
meant to synchronize the phase of mixing across multiple chips.
Copyright 2011–2012, Texas Instruments Incorporated
REGISTER DESCRIPTIONS
23
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