參數(shù)資料
型號： AD9877-EB
廠商： Analog Devices, Inc.
英文描述： Mixed-Signal Front End Set-Top Box, Cable Modem
中文描述： 混合信號前端機頂盒，電纜調(diào)制解調(diào)器
文件頁數(shù)： 21/36頁
文件大?。?/td> 1094K
代理商： AD9877-EB
AD9877
Table 7. Cable Driver Gain Control
Bits [7:4]
CA Interface Transmit Word
0000
0000 0000 (default)
0001
0000 0001
0010
0000 0010
0011
0000 0100
0100
0000 1000
0101
0001 0000
0110
0010 0000
0111
0100 0000
1000
1000 0000
Rev. B | Page 21 of 36
In this mode, the lower bits determine the fine gain setting of
the DAC output.
Table 8. DAC Output Fine Gain Setting
Bits [3:0]
DAC Fine Gain
0000
0.0 dB (default)
0001
0.5 dB
0010
1.0 dB
0011
1.5 dB
...
...
1110
7.0 dB
1111
7.5 dB
New data is automatically sent over the 3-wire CA interface
(and DAC gain adjust) whenever the value of the active gain
control register changes or a new profile is selected. The default
value is 0x00 (lowest gain).
The formula for the combined output level calculation of the
AD9877 fine gain and the AD8327 or AD8322 coarse gain is
V
8327
=
V
9877(0)
+ (
fine
)/2 + 6(
coarse
) 19
V
8322
=
V
9877(0)
+ (
fine
)/2 + 6(
coarse
) 14
where:
fine
is the decimal value of Bits [3:0].
coarse
is the decimal value of Bits [7:8].
V
9877(0)
is the level at AD9877 output in dBmV for
fine
= 0.
V
8327
is the level at output of the AD8327 in dBmV.
V
8322
is the level at output of the AD8322 in dBmV.
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