參數(shù)資料
型號： EVAL-AD1940MINIBZ
廠商： Analog Devices Inc
文件頁數(shù)： 15/36頁
文件大?。?/td> 0K
描述： BOARD EVAL AD1940 MINI SIGMADSP
標(biāo)準(zhǔn)包裝： 1
系列： SigmaDSP®
主要目的： 音頻，音頻處理
嵌入式： 是，DSP
已用 IC / 零件： AD1940
主要屬性： 單芯片多通道 28/56 位音頻 DSP
次要屬性： 均衡，交叉，低音增強(qiáng)，多頻帶動態(tài)處理，延遲等
已供物品： 板，線纜，CD，電源，USB 適配器
產(chǎn)品目錄頁面： 775 (CN2011-ZH PDF)
相關(guān)產(chǎn)品： AD1940YSTZ-ND - IC DSP AUDIO 16CH/28BIT 48-LQFP
AD1940YSTZRL-ND - IC DSP AUDIO 16CH/28BIT 48-LQFP
AD1940/AD1941
Rev. B | Page 22 of
36
–1.0
–0.8
–0.6
–0.4
–0.2
0
0.2
0.4
0.6
0.8
1.0
35
25
15
5
TIME (ms)
OU
TPU
T
LEVEL
(
V
)
04607-029
20
10
030
Figure 16. Slew RAM—Linear Update Decreasing Ramp
Constant dB and RC Type (Exponential) Update Math
Exponential math is accomplished by shifts and adds with a
range from 6.1 ms to 1.27 s (–60 dB relative to 0 dB full scale).
When the ramp type is set to 01 (constant dB), each step size is
set to the current value in the slew data. When the ramp type
bits are set to 10 (RC type), the step sizes are equal to the
difference between the values in the target RAM and slew RAM.
Figure 17 and Figure 18 show examples of this type of
target/slew RAM ramping. A decreasing ramp of both the
constant dB and RC type ramps is a mirror image of the
constant dB increasing ramp, and is show in Figure 19.
04607-0-018
TIME (ms)
OU
TPU
T
LEVEL
(
V
)
1
0.8
0.6
0.4
0.2
0
–0.6
–0.4
–0.2
–0.8
–1
010
520
15
30
25
35
Figure 17. Slew RAM—Constant dB Update Increasing Ramp
04607-0-019
TIME (ms)
OU
TPU
T
LEVEL
(
V
)
1
0.8
0.6
0.4
0.2
0
–0.6
–0.4
–0.2
–0.8
–1
35
25
15
5
20
10
030
Figure 18. Slew RAM—RC Type Update Increasing Ramp
–1.0
–0.8
–0.6
–0.4
–0.2
0
0.2
0.4
0.6
0.8
1.0
TIME (ms)
OU
TPU
T
LEVEL
(
V
)
04607-030
35
25
15
5
20
10
030
Figure 19. Slew RAM—Constant dB and RC Type
Update Decreasing Ramp, Full Scale
04607-0-020
TIME (ms)
OU
TPU
T
LEVEL
(
V
)
1
0.8
0.6
0.4
0.2
0
–0.6
–0.4
–0.2
–0.8
–1
35
25
15
5
20
10
030
Figure 20. Slew RAM—Constant Time Update Increasing Ramp, Full Scale
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