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SM5844 データシート(PDF) 15 Page - Nippon Precision Circuits Inc

部品番号 SM5844
部品情報  Asynchronous Sample Rate Converter
PDF  26 Pages
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メーカー  NPC [Nippon Precision Circuits Inc]
ホームページ  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM5844 データシート(HTML) 15 Page - Nippon Precision Circuits Inc

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SM5844AF
NIPPON PRECISION CIRCUITS—15
Attenuation (MDT, MCK, MLEN)
The digital attenuator coefficients are read in as
serial data on the microcontroller interface. Data on
MDT is read into the internal shift register on the
rising edge of MCK, and then 12 bits are latched
internally on the rising edge of MLEN.
When the leading bit is 0 (B1 = LOW), the following
11 bits are read into the attenuation register and used
as an unsigned integer in MSB first format. See
figure 3.
Although the attenuation data comprises 11 bits,
only 1025 levels are valid as given by the following.
The gain of the attenuator for values of DATT from
001H to 400H are given by the following equations.
Note that when the F12DB flag is HIGH, the gain is
shifted by +12.0412 dB.
After a system reset initialization, DATT is set to
400H and the F12DB flag is LOW, corresponding to
0 dB gain. (The F12DB flag is described in table 2.)
Figure 3. Attenuation data format (microcontroller interface)
MCK
MDT
MLEN
MCK and MLEN can also follow the dotted lines.
LOW
B1
a0
B2
a1
B3
a2
B4
a6
B8
a7
B9
a8
B10
MSB
a9
B11
a10
B12
LSB
DATT
a
i
2
10
i
–
()
×
i
0
=
10
∑
=
Gain
20
DATT
1024
----------------


log
×
[dB]
=
20
DATT
256
----------------


log
×
[dB]
=
when F12DB = LOW
when F12DB = HIGH
Table 5. Attenuator settings
Attenuation data DAT T
F12DB = LOW (default)
F12DB = HIGH
Gain (dB)
Linear expression
Gain (dB)
Linear expression
000H
−∞
0.0
−∞
0.0
001H
−60.206
1/1024
−48.165
1/256
↓↓↓↓↓
100H
−12.041
256/1024
0.0
256/256
↓↓↓↓↓
3FFH
−0.0085
1023/1024
12.032
1023/256
400H (to 7FFH)
0
1.0
12.041
4.0



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