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參數(shù)資料
| 型號： | PCM1720 |
| 英文描述： | Stereo Audio DIGITAL-TO-ANALOG CONVERTER MPEG2/AC-3 COMPATIBLE |
| 中文描述： | 立體聲音頻數(shù)字模擬轉換器MPEG2/AC-3兼容 |
| 文件頁數(shù)： | 12/13頁 |
| 文件大小： | 194K |
| 代理商： | PCM1720 |
PCM1720
12
POWER SUPPLY
CONNECTIONS
PCM1720 has two power supply connections: digital (V
DD
)
and analog (V
CC
). Each connection also has a separate
ground. If the power supplies turn on at different times, there
is a possibility of a latch-up condition. To avoid this condi-
tion, it is recommended to have a common connection
between the digital and analog power supplies. If separate
supplies are used without a common connection, the delta
between the two supplies during ramp-up time must be less
than 0.6V.
An application circuit to avoid a latch-up condition is shown
in Figure 10.
FIGURE 11. 5-Level
Σ
Modulator Block Diagram.
FIGURE 10. Latch-up Prevention Circuit.
DGND
AGND
V
DD
V
CC
Digital
Power Supply
Analog
Power Supply
BYPASSING POWER SUPPLIES
The power supplies should be bypassed as close as possible
to the unit. Refer to Figure 13 for optimal values of bypass
capacitors. It is also recommended to include a 0.1
μ
F ce-
ramic capacitor in parallel with the 10
μ
F tantalum capacitor.
3rd ORDER
Σ
MODULATOR
Frequency (kHz)
G
20
0
–20
–40
–60
–80
–100
–120
–140
–160
0
5
10
15
20
25
FIGURE 12. Quantization Noise Spectrum.
THEORY OF OPERATION
The delta-sigma section of PCM1720 is based on a 5-level
amplitude quantizer and a 3rd-order noise shaper. This
section converts the oversampled input data to 5-level delta-
sigma format. A block diagram of the 5-level delta-sigma
modulator is shown in Figure 11. This 5-level delta-sigma
modulator has the advantage of stability and clock jitter over
the typical one-bit (2-level) delta-sigma modulator.
The combined oversampling rate of the delta-sigma modu-
lator and the internal 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 of the 5-level
delta-sigma modulator is shown in Figure 12.
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
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相關代理商/技術參數(shù) |
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|---|---|
| PCM1720E | 功能描述:音頻數(shù)/模轉換器 IC Ster DAC MPEG2/ AC-3 Compatible 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 |
| PCM1720E/2K | 功能描述:音頻數(shù)/模轉換器 IC Ster DAC MPEG2/ AC-3 Compatible 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 |
| PCM1720E/2KG4 | 功能描述:音頻數(shù)/模轉換器 IC Ster DAC MPEG2/ AC-3 Compatible 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 |
| PCM1720EG4 | 功能描述:音頻數(shù)/模轉換器 IC Ster DAC MPEG2/ AC-3 Compatible 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 |
| PCM1721 | 制造商:BB 制造商全稱:BB 功能描述:DIGITAL-TO-ANALOG CONVERTER WITH PROGRAMMABLE PLL |
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