參數(shù)資料
型號(hào)： AD6654CBC
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 39/88頁(yè)
文件大?。?/td> 0K
描述： IC ADC 14BIT W/4CH RSP 256CSPBGA
標(biāo)準(zhǔn)包裝： 1
位數(shù)： 14
采樣率（每秒）： 92.16M
數(shù)據(jù)接口： 串行，并聯(lián)
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 2.5W
電壓電源： 模擬和數(shù)字
工作溫度： -25°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 256-BGA，CSPBGA
供應(yīng)商設(shè)備封裝： 256-CSPBGA（17x17）
包裝： 托盤
輸入數(shù)目和類型： 1 個(gè)差分，單極
AD6654
Rev. 0 | Page 44 of 88
PROGRAMMING DRCF REGISTERS FOR
AN ASYMMETRICAL FILTER
To program the DRCF registers for an asymmetrical filter:
1.
Write NTAPS – 1 in the DRCF taps register, where
NTAPS is the number of filter taps. The absolute
maximum value for NTAPS is 64 in asymmetrical filter
mode.
2.
Write 0 for the DRCF coefficient offset register.
3.
Write 0 for the symmetrical filter bit in the DRCF control
register.
4.
Write the start address for the coefficient RAM, typically
equal to the coefficient offset register in the DRCF start
address register.
5.
In the DRCF stop address register, write the stop address
for the coefficient RAM, typically equal to the following:
Coefficient Offset + NTAPS 1
6.
Write all coefficients in reverse order (start with last
coefficient) to the DRCF coefficient memory register. If in
8-bit microport mode or serial port mode, write the lower
byte of the memory register first and then the higher byte.
After each write access to the DRCF coefficient memory
register, the internal RAM address is incremented starting
with the start address and ending with the stop address.
Note that each write or read access increments the internal
RAM address. Therefore, all coefficients should be read first
before reading them back. Also, for debugging purposes, each
RAM address can be written individually by making the start
and stop addresses the same. Therefore, to program one RAM
location, the user writes the address of the RAM location to
both the start and stop address registers, and then writes the
coefficient memory register.
PROGRAMMING DRCF REGISTERS FOR A
SYMMETRIC FILTER
To program the DRCF registers for a symmetrical filter:
1.
Write NTAPS – 1 in the DRCF taps register, where
NTAPS is the number of filter taps. The absolute
maximum value for NTAPS is 128 in symmetric filter
mode.
2.
Write ceil(64 – NTAPS/2) for the DRCF coefficient offset
register, where the ceil function takes the closest integer
greater than or equal to the argument.
3.
Write 1 for the symmetrical filter bit in the DRCF control
register.
4.
Write the start address for the coefficient RAM, typically
equal to coefficient offset register, in the DRCF start
address register.
5.
Write the stop address for the coefficient RAM, typically
equal to ceil(NTAPS/2) – 1, in the DRCF stop address
register.
6.
Write all coefficients to the DRCF coefficient memory
register, starting with the middle of the filter and working
towards the end of the filter. When coefficients are
numbered 0 to NTAPS – 1, the middle coefficient is given
by the coefficient number ceil(NTAPS/2). If in 8-bit
microport mode or serial port mode, write the lower byte
of the memory register first and then the higher byte.
After each write access to the DRCF coefficient memory
register, the internal RAM address is incremented starting
with the start address and ending with the stop address.
Note that each write or read access increments the internal
RAM address. Therefore, all coefficients should be read first
before reading them back. Also, for debugging purposes, each
RAM address can be written individually by making the start
and stop addresses the same. Therefore, to program one RAM
location, the user writes the address of the RAM location to
both the start and stop address registers, and then writes the
coefficient memory register.
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