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參數(shù)資料
| 型號： | ADAV4601BSTZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 20/60頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AUDIO CODEC PROCESSOR 80-LQFP |
| 標準包裝： | 1 |
| 系列： | SigmaDSP® |
| 類型： | 音頻處理器 |
| 應用： | TV |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 80-LQFP |
| 供應商設備封裝： | 80-LQFP（14x14） |
| 包裝： | 托盤 |
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ADAV4601
Rev. B | Page 27 of 60
Target/Slew RAM Initialization
On reset, the target/slew RAM initializes to preset values. The
target RAM initializes to a linear ramp type with a time constant of 5
and the data set to 1.0. The slew RAM initializes to 1.0. These
defaults result in a full-scale (1.0 to 0.0) ramp time of 21.3 ms.
Linear Update
A linear update is the addition or subtraction of a constant value,
referred to as a step. The following equation describes this step
size as
()
20
10
13
5
2
×
=
CONST
t
Step
The result of the equation is normalized to a 5.23 data format.
This produces a time constant range from 6.75 ms to 213.4 ms
(60 dB relative to 0 dB full scale). An example of this kind of
update is shown in Figure 39 and Figure 40. All slew RAM figure
examples, except the half-scale constant time ramp plot (Figure 45),
show an increasing or decreasing ramp between 80 dB and 0 dB
(full scale). All figures except the constant time plots (Figure 44,
Figure 45, and Figure 46) use a time constant of 0x7 (0x0 being
the fastest and 0xF being the slowest).
07
0-
1
11
TIME (ms)
O
U
TP
U
T
L
E
V
E
L
(
V
)
1.0
0.4
0.6
0.8
0.2
0
–0.4
–0.2
–1.0
–0.8
–0.6
35
25
15
5
20
10
030
Figure 39. Slew RAM—Linear Update Increasing Ramp
0
70
-11
2
–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
TP
U
T
L
E
V
E
L
(
V
)
20
10
030
Figure 40. Slew RAM—Linear Update Decreasing Ramp
Constant Decibels and RC Updates (Exponential)
An exponential update is accomplished by shifts and additions
with a range from 6.1 ms to 1.27 sec (60 dB relative to 0 dB full
scale). When the ramp type is set to 01 (constant decibels), each
step size is set to the current value in the slew data. When the
ramp type bits are set to 10 (RC), the step size is equal to the
difference between the values in the target RAM and the slew
07
0-
11
3
TIME (ms)
O
U
TP
U
T
L
E
V
E
L
(
V
)
1.0
0.8
0.6
0.4
0.2
0
–0.6
–0.4
–0.2
–0.8
–1.0
010
520
15
30
25
35
Figure 41. Slew RAM—Constant Decibels Update Increasing Ramp
07
0-
11
4
TIME (ms)
O
U
TP
U
T
L
E
V
E
L
(
V
)
1.0
0.8
0.6
0.4
0.2
0
–0.6
–0.4
–0.2
–0.8
–1.0
35
25
15
5
20
10
030
Figure 42. Slew RAM—RC Update Increasing Ramp
07
0-
1
15
–1.0
–0.8
–0.6
–0.4
–0.2
0
0.2
0.4
0.6
0.8
1.0
TIME (ms)
OU
TP
U
T
L
E
V
E
L
(V
)
35
25
15
5
20
10
030
Figure 43. Slew RAM—Constant Decibels and RC
Updates Decreasing Ramp, Full Scale
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