参数资料
型号: AD9879BSZ
厂商: Analog Devices Inc
文件页数: 7/32页
文件大小: 0K
描述: IC PROCESSOR FRONT END 100MQFP
标准包装: 1
位数: 12
通道数: 5
功率(瓦特): 587mW
电压 - 电源,模拟: 3.3V
电压 - 电源,数字: 3.3V
封装/外壳: 100-BQFP
供应商设备封装: 100-MQFP(14x20)
包装: 托盘
AD9879
Rev. A | Page 15 of 32
Σ- OUTPUTS
The AD9879 contains an on-chip Σ-Δ output that provides 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 7.
This bit stream can be low-pass filtered to generate a
programmable dc voltage of
VDC = (Σ-Δ Code/4096)(VH) + VL
(8)
where:
VH = VDRVDD 0.6 V
VL = 0.4 V
In set-top box and cable modem applications, the output can be
used to control external variable gain amplifiers or RF tuners. A
simple single-pole RC low-pass filter provides sufficient
filtering (see Figure 8).
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 (see Figure 9).
0x000
0x001
0x002
0x800
0xFFF
4096
× 8 tMCLK
4096
× 8 tMCLK
8
tMCLK
8
tMCLK
02773-007
Figure 7. Σ- Output Signals
Σ-
CONTROL
WORD
12
DAC
R
C
DC (VL TO VH)
TYPICAL:
R = 50k
C = 0.1
F
f–3dB = 1/(2πRC) = 318Hz
÷8
MCLK
AD9879
02773-
008
Figure 8. Σ- RC Filter
R
C
VOUT = (VSD + VOFFSET) (1 + R/R1)/2
TYPICAL:
R = 50k
C = 0.1
F
f–3dB = 1/(2πRC) = 318Hz
AD9879
R
VOFFSET
OP250
R1
R
C
VSD
VOUT
Σ-
02773-009
SIGMA-DELTA
Figure 9. Σ- Active Filter with Gain and Offset
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