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參數(shù)資料
| 型號： | PCM1712 |
| 英文描述： | DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 數(shù)字到模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 101K |
| 代理商： | PCM1712 |
13
PCM1712
BYPASSING POWER SUPPLIES
The power supplies should be bypassed as close as possible
to the unit. Refer to Figure 16 for optimal values of bypass
capacitors. For applications which require very high perfor-
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
The delta-sigma section of PCM1712 is based on a 5-level
amplitude quantizer and a 3rd-order noise shaper. This
section converts the oversampled 16-bit input data to 5-level
delta-sigma format.
A block diagram of the 5-level delta-sigma modulator is
shown in Figure 10. This 5-level delta-sigma modulator has
the advantage of stability and clock jitter sensitivity over the
typical one-bit (2 level) delta-sigma modulator.
FIGURE 10. 5 Level
Σ
Modulator Block Diagram.
Out
48fs
In
8fs
16 Bit
+
+
+
4
3
2
1
0
5-level Quantizer
+
–
+
Z
–1
+
–
+
Z
–1
+
+
Z
–1
DGND
AGND
V
DD
V
CC
Digital
Power Supply
Analog
Power Supply
FIGURE 9. Latch-up Prevention Circuit.
POWER SUPPLY
CONNECTIONS
PCM1712 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.
FIGURE 8. Latch-up Prevention Circuit.
NOTE: (1) XTO must be open.
Internal System Clock
XTI
XTO
(1)
CLKO (XTI)
External System Clock Input
相關PDF資料 |
PDF描述 |
|---|---|
| PCM1712U | DIGITAL-TO-ANALOG CONVERTER |
| PCM1715 | Dual Voltage Output CMOS Delta-Sigma DIGITAL-TO-ANALOG CONVERTER With On-Chip Digital Filter |
| PCM1715U | Dual Voltage Output CMOS Delta-Sigma DIGITAL-TO-ANALOG CONVERTER With On-Chip Digital Filter |
| PCM1716 | 24-Bit, 96kHz Sampling CMOS Delta-Sigma Stereo Audio DIGITAL-TO-ANALOG CONVERTER |
| PCM1717 | Stereo Audio DIGITAL-TO-ANALOG CONVERTER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PCM1712U | 制造商:BB 制造商全稱:BB 功能描述:DIGITAL-TO-ANALOG CONVERTER |
| PCM1714U | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Audio Digital-to-Analog Converter |
| PCM1715 | 制造商:BB 制造商全稱:BB 功能描述:Dual Voltage Output CMOS Delta-Sigma DIGITAL-TO-ANALOG CONVERTER With On-Chip Digital Filter |
| PCM1715U | 制造商:BB 制造商全稱:BB 功能描述:Dual Voltage Output CMOS Delta-Sigma DIGITAL-TO-ANALOG CONVERTER With On-Chip Digital Filter |
| PCM1716 | 制造商:BB 制造商全稱:BB 功能描述:24-Bit, 96kHz Sampling CMOS Delta-Sigma Stereo Audio DIGITAL-TO-ANALOG CONVERTER |
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