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參數資料
| 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，電纜調制解調器 |
| 文件頁數： | 17/36頁 |
| 文件大小： | 1094K |
| 代理商： | AD9877-EB |
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AD9877
Σ-Δ OUTPUTS
The AD9877 contains two independent Σ-Δ outputs that
provide a digital logic bit stream with an average duty cycle that
varies between 0% and (4095/4096)%, depending on the
programmed code, as shown in Figure 19.
Rev. B | Page 17 of 36
These bit streams can be low-pass filtered to generate
programmable dc voltages of
V
DC
= (Σ-Δ
Code
/4096)(
V
H
) +
V
L
where:
V
H
= V
DRVDD
0.6 V.
V
L
= 0.4 V.
In set-top box and cable modem applications, the outputs can
be used to control external variable gain amplifiers and RF
tuners. A simple single-pole RC low-pass filter provides
sufficient filtering (Figure 20).
In more demanding applications where additional gain, level
shift, or drive capability is required, a first or second order
active filter might be considered for each Σ-Δ output (Figure 21).
0x000
0x001
0x002
0x800
0xFFF
4096
×
8
t
MCLK
4096
×
8
t
MCLK
8
t
MCLK
8
t
MCLK
0
Figure 19. Σ-Δ Output Signals
Σ
-
Δ
Σ
-
Δ
WORD 0
WORD 1
12
12
SIGMA-DELTA 0
SIGMA-DELTA 1
R
R
C
C
DC (0.4 TO
DRVDD – 0.6V)
DC (0.4 TO
TYPICAL:
R = 50k
Ω
C = 0.01
μ
F
f
–3dB
= 1/(2
π
RC) = 318Hz
÷
8
MCLK
AD9877
0
Figure 20. Σ-Δ RC Filter
R
C
V
OUT
= (V
SD
+ V
OFFSET
) (1 + R/R1)/2
TYPICAL:
R = 50k
Ω
C = 0.01
μ
F
f
–3dB
= 1/(2
π
RC) = 318Hz
AD9877
R
V
OFFSET
OP250
R1
R
C
V
SD
V
OUT
Σ
-
Δ
0
Figure 21. Σ-Δ Active Filter with Gain and Offset
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