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參數(shù)資料
| 型號(hào)： | PCM1710U |
| 英文描述： | Stereo Audio DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 立體聲音頻數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 13/17頁(yè) |
| 文件大?。?/td> | 192K |
| 代理商： | PCM1710U |
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PCM1710U
EXTERNAL SYSTEM CLOCK
Figure 7 is a diagram showing the internal clock in conjunc-
tion with an external crystal oscillator.
Internal System Clock
XTI
XTO
CLKO (XTI)
C
1
C2
Crystal
C
1
, C
2
: 10pF ~ 20pF
FIGURE 7. External Crystal Oscillator.
FIGURE 9. Latch-up Prevention Circuit.
mance at low levels (such as keyboards, synthesizers, etc.)
it may be beneficial to provide additional bypassing on
pin 15 (V
CC1
) with a low ESR 100
μ
F capacitor. This will
eliminate stray tones which may be above the noise floor.
THEORY OF OPERATION
PCM1710 is an oversampling delta-sigma D/A converter,
consisting of an input interface/attenuator, a 4th-order multi-
level delta-sigma modulator, a low pass filter and an output
amplifier (see Figure 10).
Figure 8 is a diagram showing the internal clock with an
external clock source, instead of an oscillator. An exter-
nal system clock (input to XTI) must meet the follow-
ing conditions:
HIGH LEVEL
V
IH
> 0.64V
DD
V
IH
> 0.28V
DD
T
H
> 10ns
T
L
> 10ns
LOW LEVEL
FIGURE 8. External System Clock.
Internal System Clock
XTI
XTO
(1)
CLKO (XTI)
External System Clock Input
NOTE: (1) XTO must be open.
POWER SUPPLY CONNECTIONS
PCM1710 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 9.
BYPASSING POWER SUPPLIES
The power supplies should be bypassed as close as possible
to the unit. Refer to Figure 19 for optimal values of bypass
capacitors. For applications which require very high perfor-
MODULATOR
The delta-sigma section of the PCM1710 is based on a 5-
level amplitude quantizer and a 4th-order filter. This con-
verts oversampled 16-or 20-bit input data to 5-level delta-
sigma format. A block diagram of the 5-level modulator is
shown in Figure 11.
This 5-level delta-sigma modulator has the advantage of
improved stability and jitter sensitivity over the typical one
bit (2-level) delta-sigma modulator.
The combined oversampling rate of the delta-sigma modula-
tor and the internal 8X oversampling digital filter is 48fs at
a system clock of 384fs and 32fs at a system clock of 256fs.
A block diagram of the 4th-order filter section Hf (z) in the
delta-sigma modulator is shown in Figure 12.
In general, high order one-bit delta-sigma modulators have
disadvantages due to loop instability (multiple integration
stages). The five level delta-sigma modulator of the PCM1710
uses phase compensation techniques to obtain stable opera-
tion. In Figure 12, the coefficients B1 to B4 give the basic
form of the filter, and A2 to A4 are used for phase compen-
sation of the feedback loop.
The theoretical quantization noise performance of five level
delta-sigma modulator is shown in Figure 13 and 14. In the
audio band, the quantization noise floor level of the PCM1710
is less than 130dB (at a system clock of 384fs).
DGND
AGND
V
DD
V
CC
Digital
Power Supply
Analog
Power Supply
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCM1710U | 制造商:BURR-BROWN 功能描述:IC DAC AUDIO SMD 1710 SOIC28 制造商:Texas Instruments 功能描述:Digital-Analog Converter IC Interface Ty |
| PCM1710U/1K | 功能描述:數(shù)模轉(zhuǎn)換器- DAC Dual Voltage Output CMOS D-S DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| PCM1710U/1KG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC Dual Voltage Output CMOS D-S DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| PCM1710UG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC Dual Voltage Output CMOS D-S DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| PCM1712 | 制造商:BB 制造商全稱:BB 功能描述:DIGITAL-TO-ANALOG CONVERTER |
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