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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)： | 13/18頁 |
| 文件大小： | 240K |
| 代理商： | PCM1750U |
13
PCM1750
POWER SUPPLY REJECTION
Because of the architecture of the PCM1750, power supply
rejection varies with input signal size. The spec table value
is expressed in the relative terms of percent of V
IN
per
percent change of the supply voltage. The PSR versus
Frequency plot in the
Typical Performance Curves
show
PSR expressed versus an increase in power supply ripple
frequency.
PERFORMANCE OVER TEMPERATURE
Specification Temperatures
All critical specifications are tested at 25
°
C. The drift
specification temperature range is from 0
°
C to +70
°
C. The
PCM1750 will operate over the wider temperature range of
–40
°
C to +85
°
C.
Gain and Offset Drift
Although the PCM1750 is primarily meant for use in dy-
namic applications, specifications are also given for more
traditional DC drift parameters such as temperature gain and
offset drift. The primary cause of drift in the PCM1750 is the
bandgap reference. Much lower gain drift can be realized if
necessary by using any circuit similar to the external refer-
ence circuits shown in Figure 8. Also, refer to the
Typical
Performance Curves
of V
REF
Output versus Temperature.
Dynamic Performance
Dynamic performance is predominated by the absolute lin-
earity of the PCM1750. Because of the excellent ratio
tracking versus temperature of poly-poly capacitors, there is
virtually no change in dynamic performance of the converter
over temperature (primarily THD+N). The dynamic specifi-
cations over temperature cannot be guaranteed, however, as
they are not 100% tested.
INSTALLATION
ANTI-ALIASING FILTER
To prevent unwanted input signals from being aliased into
the passband of the converter, it is necessary to suppress all
out of band signals above 1/2 the sampling frequency of the
ADC by using a low-pass filter. The requirement for an anti-
aliasing filter, however, can be reduced by using oversampling
techniques. By raising the sample rate of the converter by a
factor of 2 or even 4, the roll off of the anti-aliasing filter can
be reduced. In Figure 9, a 6th order, linear-phase, anti-
aliasing filter is implemented using low-cost dual audio op
amps. This filter will suppress frequencies above 96kHz by
80dB. For many applications a 4th or 2nd order anti-aliasing
filter will be adequate when using the PCM1750 in the 4
x
oversampling mode.
FIGURE 7. PCM1750 Connection Diagram.
+10μF*
or
47μF
0.1μF
(low
leakage,
ceramic)
150k
25k
47k
25k
+
10μF*
or
47μF
10μF*
+
+5V
–5V
= Connect directly to ground plane
Optional External Adjust
–V
+V
SOUT Left
Ext Clk In
+V
+V
+V
DCOM
ACOM
DCOM
Convert
SOUT Right
+V
–V
Offset Adj Left
MSB Adj Left
V Left
Ref In Left
Ref Out Left
ACOM
Ref Com
Ref Bypass
ACOM
Ref Out Right
Ref In Right
V Right
MSB Adj Right
Offset Adj Right
A
A
D
D
D
A
A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
150k
25k
47k
25k
Optional External Adjust
10
10
10μF*
+
220pF
150
220pF
47k
0.01μF
0.01μF
0.01μF
0.01μF
47k
* High quality tantalum.
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15
150
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| 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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