參數(shù)資料
型號(hào): PCM1740
英文描述: CONN,CPRSN,2-WAY
中文描述: 立體聲音頻數(shù)模轉(zhuǎn)換器與石英振蕩器和PLL
文件頁(yè)數(shù): 12/20頁(yè)
文件大小: 359K
代理商: PCM1740
12
PCM1740
REGISTER DEFINITIONS
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
Register 0
res
res
res
res
res
0
0
0
AL7
AL6
AL5
AL4
AL3
AL2
AL1
AL0
Left Channel Attenuation Data
Default: AL[7:0] = FF
HEX
Register 0 is used to set the digital attenuation level for the Left Channel. If the ATC bit in Register 3 is set to “1”, then this
data is also used to control the Right Channel attenuation. The attenuation level is defined by the following relationships:
Attenuation (dB) = 20 x log (AL[7:0]
DEC
÷
256), when AL[7:0] = 01
HEX
(1
DEC
) through FE
HEX
(254
DEC
)
Attenuation (dB) = –
(or Mute), when AL[7:0] = 00
HEX
Attenuation (dB) = 0dB, when AL[7:0] = FF
HEX
The Attenuation Load bit, LD, in Register 4 must be set to “1” in order to update attenuation settings.
If LD is set to “0”, the attenuation remains at the previously programmed level, ignoring the new data until LD is set to “1”.
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
Register 1
res
res
res
res
res
0
0
1
AR7
AR6
AR5
AR4
AR3
AR2
AR1
AR0
Right Channel Attenuation Data
Default: AR[7:0] = FF
HEX
Register 1 is used to set the digital attenuation level for the Right Channel. If the ATC bit in Register 3 is set to ‘1’, then the
Left Channel attenuation data in Register 1 is used to control the Right Channel attenuation. The attenuation level is defined
by the following relationships:
Attenuation (dB) = 20 x log (AR[7:0]
DEC
÷
256), when AR[7:0] = 01
HEX
(1
DEC
) through FE
HEX
(254
DEC
)
Attenuation (dB) = –
(or Mute), when AR[7:0] = 00
HEX
Attenuation (dB) = 0dB, when AR[7:0] = FF
HEX
The Attenuation Load bit, LD, in Register 4 must be set to 1 in order to update attenuation settings.
If LD is set to “0”, the attenuation remains at the previously programmed level, ignoring the new data until LD is set to “1”.
MUT
Soft Mute Control
The MUT bit controls the soft mute function. Soft mute changes the digital attenuation level for both the Left
and Right channels, stepping from the currently programmed value to infinite attenuation one step per sample
period, or 1/f
S
. This provides a quiet muting of the outputs without audible noise.
MUT = 0
MUT = 1
Soft Mute Disabled (default)
Soft Mute Enabled
DEM
Digital De-Emphasis
The DEM bit controls the digital de-emphasis function, which is valid only for 32kHz, 44.1kHz,
and 48kHz sampling frequencies. The de-emphasis plots are shown in the Typical Performance Curves section
of this data sheet.
DEM = 0
DEM = 1
De-Emphasis OFF (default)
De-Emphasis ON
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
Register 2
res
res
res
res
res
0
1
0
PL3
PL2
PL1
PL0
IW1
IW0
DEM
MUT
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PCM1740E/2KG4 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC Stereo DAC w/Prog PLL&VCXO RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel
PCM1740E-1/2K 制造商:Texas Instruments 功能描述:
PCM1740EG4 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC Stereo DAC w/Prog PLL&VCXO RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel