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參數(shù)資料
| 型號： | PCM1740 |
| 英文描述： | CONN,CPRSN,2-WAY |
| 中文描述： | 立體聲音頻數(shù)模轉換器與石英振蕩器和PLL |
| 文件頁數(shù)： | 7/20頁 |
| 文件大小： | 359K |
| 代理商： | PCM1740 |
7
PCM1740
3rd ORDER
Σ
MODULATOR
Frequency (kHz)
G
20
0
–20
–40
–60
–80
–100
–120
–140
–160
0
5
10
15
20
25
STEREO DIGITAL-TO-ANALOG
CONVERTER
The stereo D/A converters of the PCM1740 utilize a multi-
level delta-sigma architecture. Based upon a third-order
noise shaper and a 5-level amplitude quantizer, this section
converts the 8x oversampled, 18-bit input data from the
interpolation filter to a 5-level delta-sigma format. A block
diagram of the multi-level delta-sigma modulator is shown
in Figure 1. This architecture has the advantage of improved
stability and increased tolerance to clock jitter when com-
pared to the one-bit (2-level) delta-sigma D/A converters.
The combined oversampling rate of the delta-sigma modu-
lator and the 8x interpolation filter is 48f
S
for a 384f
S
system
clock, and 64f
S
for a 256f
S
system clock. The theoretical
quantization noise performance for the 5-level delta-sigma
modulator is shown in Figure 2.
The output of the delta-sigma modulator is low-pass filtered
and buffered by an on-chip output amplifier. For best
performance, an external low-pass filter is recommended.
Refer to the “Applications Information” section of this data
sheet for details regarding DAC output filter recommenda-
tions.
The PCM1740 includes two analog outputs, V
OUT
L (pin 14)
and V
OUT
R (pin 11), corresponding to the left and right
audio outputs. The full-scale output amplitude is 0.62 V
CC
,
or 3.1Vp-p with a +5V supply and an AC coupled load of
5k
or greater. The analog outputs are centered about the
DC common mode voltage, which is typically V
CC
/2.
The DC common-mode voltage is made available at the
V
COM
output (pin 15). This is an unbuffered output, prima-
Out
48f
S
(384f
S
)
64f
S
(256f
S
)
In
8f
18-Bit
+
+
+
4
3
2
1
0
5-level Quantizer
+
–
+
Z
–1
+
–
+
Z
–1
+
+
Z
–1
FIGURE 2. Quantization Noise Spectrum.
rily used for de-coupling purposes. See the “Applications
Information” section of this data sheet for more information
regarding the use of the V
COM
output for biasing external
circuitry.
VOLTAGE CONTROLLED CRYSTAL OSCILLATOR
(VCXO)
The PCM1740 includes an on-chip voltage-controlled crys-
tal oscillator, or VCXO, which is used to generate the
27MHz master clock required by most digital broadcast and
MPEG-2 decoding applications.
FIGURE 1. 5-Level
Σ
Modulator Block Diagram.
相關PDF資料 |
PDF描述 |
|---|---|
| PCM1740E | Stereo Audio DIGITAL-TO-ANALOG CONVERTER with VCXO and PLL |
| PCM1741 | %2B3.3V Single-Supply, 24-Bit, 96kHz Sampling Enhanced Multilevel, Delta-Sigma, Audio DIGITAL-TO-ANALOG CONVERTER |
| PCM1741E | +3.3V Single-Supply, 24-Bit, 96kHz Sampling Enhanced Multilevel, Delta-Sigma, Audio DIGITAL-TO-ANALOG CONVERTER |
| PCM1742 | 24-Bit, 192kHz Sampling Enhanced Multilevel, Delta-Sigma, Audio DIGITAL-TO-ANALOG CONVERTER |
| PCM1742E | 24-Bit, 192kHz Sampling Enhanced Multilevel, Delta-Sigma, Audio DIGITAL-TO-ANALOG CONVERTER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PCM1740E | 功能描述:音頻數(shù)/模轉換器 IC Stereo DAC w/Prog PLL&VCXO RoHS:否 制造商:Texas Instruments 轉換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉換速率: 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 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM1740E/2K | 功能描述:音頻數(shù)/模轉換器 IC Stereo DAC w/Prog PLL&VCXO RoHS:否 制造商:Texas Instruments 轉換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉換速率: 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 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM1740E/2KG4 | 功能描述:音頻數(shù)/模轉換器 IC Stereo DAC w/Prog PLL&VCXO RoHS:否 制造商:Texas Instruments 轉換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉換速率: 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)/模轉換器 IC Stereo DAC w/Prog PLL&VCXO RoHS:否 制造商:Texas Instruments 轉換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉換速率: 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 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
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