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参数资料
| 型号： | HI2559 |
| 厂商： | Intersil Corporation |
| 英文描述： | 1-Bit D/A Converter For Audio Application |
| 中文描述： | 1位D / A的音频应用程序转换器 |
| 文件页数： | 9/11页 |
| 文件大小： | 669K |
| 代理商： | HI2559 |
4-9
D. Digital Attenuator
[Related pins] ATT, SHIFT, LATCH
The output data can be attenuated independently in the L
and R channels, using the transfer data from the external
microcomputer.
The ATT data of the L and R channels consist of eight bits
each, and the L and R channels can be attenuated com-
monly using the ATT control bit. (The L channel attenuation
value is used when the L and R channels are commonly
attenuated).
(1)
Command and Audio Output
The attenuation data of the L and R channels consist of eight
bits, it can be set 255 ways. The following table shows the
relationship between the commands and the outputs.
The attenuation values for 01 (H) to FE (H) can be obtained
with the following equation:
E. Digital Attenuator
Suppose that there are attenuation data ATT1, ATT2 and
ATT3, and their relationship is ATT1>ATT3>ATT2. When
ATT2 is transferred before the level reaches the value of
ATT1 (point A in the figure), the level keeps approaching to
the value of ATT2. Next, when ATT3 is transferred before
the level reaches the value of ATT2 (point B or C in the fig-
ure), the level starts approaching to the value of ATT3 from
its level at that time (point B or C in the figure). The transition
(0 dB to
→
–
∞
) between the attenuation data is 1024/F
S
(F
S
= 44kHz for CD).
F. Output Selection
[Related pins] ATT, SHIFT, LATCH
The L and R channel outputs can be set in four combinations
[L/RL + R/Mute] (16 ways in total) using the transfer data
from the external microcomputer. The following table shows
the relationship between the commands and the outputs.
CONTROL
BIT
CONTROL
WHEN SYSTEM IS CLEARED
L7 TO L0
The L channel attenuation data.
FF (H)
R7 to R0
The R channel attenuation data.
FF (H)
P3 to P0
Output selection.
9 (H) Stereo
E
De-emphasis (High = on, Low = off)
However, the time constant of the emphasis is
γ
1 = 50
μ
s and
γ
2 = 15
μ
s
when F
S
= 44.1kHz. The de-emphasis function cannot be used when F
S
is not 44.1kHz.
OFF
A
Attenuate (Low = independent, High = common). However, the L channel
attenuation value is used when the L and R channels are commonly atten-
uated.
Independent
X
Don’t care.
NOTE: When the data is more than three bytes are transferred to the ATT pin, only the three bytes transferred finally are effective.
ATTENUATION DATA
L7 TO L0/R7 TO R0
AUDIO OUTPUT
FF (H)
0dB
FE (H)
↓
01 (H)
-0.034dB
↓
-48.131dB
00 (H)
-
∞
ATT = 20log [Input data/255] dB
Ex. for attenuating data FA (H)
ATT = 20log [250/255] db = 0.172dB
0dB
A
ATT1
B
ATT3
C
ATT2
FIGURE 7. METHOD OF OBTAINING AN ATTENUATION VALUE
HI2559, CXD2559
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