參數(shù)資料
型號(hào): PCM1748E
英文描述: 24-Bit, 96kHz Sampling Enhanced Multilevel, Delta-Sigma, Audio DIGITAL-TO-ANALOG CONVERTER
中文描述: 24位,96kHz采樣加強(qiáng)多層次,Δ-Σ,音頻數(shù)字模擬轉(zhuǎn)換器
文件頁數(shù): 12/22頁
文件大?。?/td> 323K
代理商: PCM1748E
PCM1748
SBAS165
12
REGISTER DEFINITIONS
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
Register 16
0
IDX6
IDX5
IDX4
IDX3
IDX2
IDX1
IDX0
AT17
AT16
AT15
AT14
AT13
AT12
AT11
AT10
Register 17
0
IDX6
IDX5
IDX4
IDX3
IDX2
IDX1
IDX0
AT27
AT26
AT25
AT24
AT23
AT22
AT21
AT20
ATx[7:0]
Digital Attenuation Level Setting
where x = 1 or 2, corresponding to the DAC output V
OUT
L (x = 1) and V
OUT
R (x = 2).
Default Value: 1111 1111
B
Each DAC channel (V
OUT
L and V
OUT
R) includes a digital attenuator function. The attenuation level may be
set from 0dB to –63dB, in 0.5dB steps. The attenuation data for each channel can be set individually.
The attenuation level may be set using the formula below.
Attenuation Level (dB) = 0.5 (ATx[7:0]
DEC
– 255)
where: ATx[7:0]
DEC
= 0 through 255
for: ATx[7:0]
DEC
= 0 through 128, the attenuator is set to infinite attenuation.
The following table shows attenuator levels for various settings.
ATx[7:0]
Decimal Value
Attenuator Level Setting
1111 1111
B
1111 1110
B
1111 1101
B
1000 0011
B
1000 0010
B
1000 0001
B
1000 0000
B
0000 0000
B
255
254
253
131
130
129
128
0
0dB, No Attenuation (default)
–0.5dB
–1.0dB
–62.0dB
–62.5dB
–63.0dB
Mute
Mute
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
Register 18
0
IDX6
IDX5
IDX4
IDX3
IDX2
IDX1
IDX0
RSV
OVER
RSV
RSV
RSV
RSV
MUT2
MUT1
MUTx
Soft Mute Control
Where x = 1 or 2, corresponding to the DAC output V
OUT
L (x = 1) and V
OUT
R (x = 2).
Default Value: 0
MUTx = 0
MUTx = 1
Mute Disabled (default)
Mute Enabled
The mute bits, MUT1 and MUT2, are used to enable or disable the Soft Mute function for the corresponding
DAC outputs, V
OUT
L and V
OUT
R. The Soft Mute function is incorporated into the digital attenuators. When
Mute is disabled (MUTx = 0), the attenuator and DAC operate normally. When Mute is enabled by setting
MUTx = 1, the digital attenuator for the corresponding output will be decreased from the current setting
to the infinite attenuation setting one attenuator step (0.5dB) at a time. This provides a quiet, “pop”-free
muting of the DAC output.
OVER
Oversampling Rate Control
Default Value: 0
OVER = 0
OVER = 1
64x Oversampling (default)
128x Oversampling
The OVER bit is used to control the oversampling rate of the delta-sigma DACs.
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