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參數(shù)資料
| 型號： | PCM1750U |
| 英文描述： | Dual CMOS 18-Bit Monolithic Audio ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 雙通道CMOS 18位單片音頻模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 17/18頁 |
| 文件大?。?/td> | 240K |
| 代理商： | PCM1750U |
17
PCM1750
USING AN EXTERNAL REFERENCE
Normally VREF
OUT
is connected directly to VREF
IN
. The
typical value for V
REF
versus Temperature is shown in the
Typical Performance Curves
. If better drift or power supply
rejection performance is desired, one of the external refer-
ence circuits shown in Figures 8b and 8c can be used. Note
that the decoupling capacitors are still connected to VREF
IN
.
External gain adjustment is now possible by using the
variable output options available on some precision voltage
references or by varying the gain on external buffer ampli-
fiers. The range of acceptable external references is from
+2.0V to +V
A
– 2.0V, with 2.5V types being the most
commonly available. Full scale input voltage range will be
±
VREF
IN
(a +2.5V VREF
IN
results in a
±
2.5V input range).
If an external reference is used, P19 and P24 must be
bypassed with at least 1
μ
F capacitors.
SAMPLING A/D SYSTEM
Figure 9 is a partial schematic of the demonstration fixture
for the PCM1750 (orderable by model number DEM1133).
It shows the implementation of (1) a 6th order, linear-phase,
anti-aliasing filter (22kHz low-pass); (2) the PCM1750P
A/D converter; and (3) a 4
x
digital decimation filter called
the DF1750P. Not shown on this schematic, but included on
the demo fixture, are latched parallel data outputs with
strobe and a serial digital interface format (SPDIF) data
transmitter. Also included on the DEM1133 are user bread-
board areas for application specific circuit implementation.
CONNECTION TO DSP WITH DIGITAL FILTER
The PCM1750 and DF1750 combination can be connected to
the serial ports of most popular DSP processor ICs (such as
those made by AT&T, Motorola, TI, and AD) by adding a
small amount of external glue logic. Figures 10 and 11 show
the timing diagram and schematic for this interface.
To use this interface, the DSP processor IC must be configured
for 32-bit word inputs. The glue logic generates a flag bit, as
the first bit of the 32-bit word, that signifies either left or right
channel data. The flag bit will be low for left channel data and
high for right channel data.
The DF1750 can be configured for either 16- or 20-bit data,
although only 16-bit data is shown in Figure 10. After the data
is transferred into the DSP processor IC, it must be shifted
toward the LSB by one bit in order to compensate for a clock
delay in the glue logic.
FIGURE 10. PCM1750/DF1750 To DSP IC Timing Diagram.
LRCK
(LRPOL = H)
WDCK
Frame Syn L
Flag Enable
Bit Clock
Data to DSP
DATA
DATA
Channel Flag (Right Channel)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PCM1753DBQR | 24-BIT, 192 kHz SAMPLING ENHANCED MULTI-LEVEL, DELTA-SIGMA, AUDIO DIGITAL-TO-ANALOG CONVERTER |
| PCM1755DBQR | 24-BIT, 192 kHz SAMPLING ENHANCED MULTI-LEVEL, DELTA-SIGMA, AUDIO DIGITAL-TO-ANALOG CONVERTER |
| PCM1753 | 24-BIT, 192 kHz SAMPLING ENHANCED MULTI-LEVEL, DELTA-SIGMA, AUDIO DIGITAL-TO-ANALOG CONVERTER |
| PCM1753DBQ | 24-BIT, 192 kHz SAMPLING ENHANCED MULTI-LEVEL, DELTA-SIGMA, AUDIO DIGITAL-TO-ANALOG CONVERTER |
| PCM1754 | 24-BIT, 192 kHz SAMPLING ENHANCED MULTI-LEVEL, DELTA-SIGMA, AUDIO DIGITAL-TO-ANALOG CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCM1750U/1K | 功能描述:音頻模/數(shù)轉(zhuǎn)換器 IC Dual CMOS 18-Bit Mono A/D Converter RoHS:否 制造商:Wolfson Microelectronics 轉(zhuǎn)換速率: 分辨率: ADC 輸入端數(shù)量: 工作電源電壓: 最大工作溫度: 最小工作溫度: 安裝風(fēng)格: 封裝 / 箱體: 封裝: |
| PCM1750U/1KG4 | 功能描述:音頻模/數(shù)轉(zhuǎn)換器 IC Dual CMOS 18-Bit Mono A/D Converter RoHS:否 制造商:Wolfson Microelectronics 轉(zhuǎn)換速率: 分辨率: ADC 輸入端數(shù)量: 工作電源電壓: 最大工作溫度: 最小工作溫度: 安裝風(fēng)格: 封裝 / 箱體: 封裝: |
| PCM1750U1K | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Dual CMOS 18-Bit Monolithic Audio NALOG-TO-DIGITAL CONVERTER |
| PCM1750U1KG4 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Dual CMOS 18-Bit Monolithic Audio NALOG-TO-DIGITAL CONVERTER |
| PCM1750UG4 | 功能描述:音頻模/數(shù)轉(zhuǎn)換器 IC Dual CMOS 18B Monolithic Audio ADC RoHS:否 制造商:Wolfson Microelectronics 轉(zhuǎn)換速率: 分辨率: ADC 輸入端數(shù)量: 工作電源電壓: 最大工作溫度: 最小工作溫度: 安裝風(fēng)格: 封裝 / 箱體: 封裝: |
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