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參數(shù)資料
| 型號： | PCM1750P |
| 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)： | 12/18頁 |
| 文件大小： | 240K |
| 代理商： | PCM1750P |
PCM1750
12
plots are shown at four different input signal levels (with and
without a 4X decimation filter): 0dB, –20dB, –40dB, and –
60dB.
CHANNEL SEPARATION
To test channel separation a 1kHz signal sampled at 192kHz
is placed on one input of the PCM1750 while the other input
is held at 0V. An FFT is performed on the idle (0V) channel
and the result checked to insure that the 1kHz tone is
suppressed by a minimum of 96dB.
GAIN AND OFFSET ERRORS
Initial gain and bipolar offset errors are laser trimmed at the
wafer level and 100% final tested to insure compliance with
the electrical specifications. Bipolar offset errors can be
further reduced to zero by using the optional offset adjust-
ment circuitry shown in the connection diagram (Figure 7).
Gain errors can be adjusted by varying V
REF
to either
channel of the converter. This is accomplished by either
using an adjustable external reference or by placing buffer
amplifiers with adjustable gain between VREF
OUT
and
VREF
IN
as shown in Figure 8a.
INTEGRAL AND DIFFERENTIAL LINEARITY
DC Linearity Testing
The absolute linearity of the PCM1750 is on the order of 15
bits or more as can be seen from the THD versus Frequency
plots in the
Typical Performance Curves
. Not every code in
the converter must be 15-bit linear to achieve the specified
THD+N performance, but a very high percentage will be
that linear. The same observation also applies to differential
linearity errors in the PCM1750. Because the PCM1750 is
not 100% tested for DC linearity specifications, no mini-
mum or maximum specifications are given for integral or
differential linearity errors.
No Missing Codes Operation
A no missing codes specification is not given for the
PCM1750 for the same reasons as given above. The
PCM1750, however, typically has fewer than 16 codes (less
than 0.01%) missing at a 14-bit resolution level. A 100% no
missing codes specification cannot be maintained above the
12-bit level, although this has very little impact on overall
dynamic performance (THD+N). The few missing codes
that do occur at higher resolution levels are at the bit-2 and
lower major carry transitions of the converter. There are
typically no missing codes (at 14 bits) around the critical
bipolar zero operation zone (
±
1/8 of full scale range around
bipolar zero or 0V). The critical bipolar differential linearity
error can be reduced from its initial value to zero using the
optional MSB adjustment circuitry shown in the connection
diagram (Figure 7).
REFERENCE
The gain drift of the PCM1750 is primarily due to the drift
associated with the reference. Better drift performance can
be achieved using an external reference like the ones ex-
plained in the applications section (Figures 8b, 8c). The
Typical Performance Curves
plot of V
REF
Output versus
Temperature shows the full range of operation including
initial error and typical gain drift. Pertinent performance
data are found in the electrical specification table.
Reference Bypass
Both P18 and P25 (VREF
IN
) should be bypassed with a
10
μ
F to 47
μ
F tantalum capacitor. If there are important
system reasons for using the PCM1750 reference externally,
the outputs of P19 and P24 must be appropriately buffered,
and bypassed (see Figure 8).
FIGURE 6. PCM1750 Production Test Setup.
PCM1750
Low Pass
Filter
FTT
Analyzer
High
Accuracy
Sine Wave
Generator
Timing
Control
f = 192kHz
f = 1kHz
Serial Data Left
Serial Data Right
V
INL
INR
V
Parametric
Tester
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| PCM1750U | Dual CMOS 18-Bit Monolithic Audio ANALOG-TO-DIGITAL CONVERTER |
| PCM1753DBQR | 24-BIT, 192 kHz SAMPLING ENHANCED MULTI-LEVEL, DELTA-SIGMA, AUDIO DIGITAL-TO-ANALOG CONVERTER |
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| PCM1753 | 24-BIT, 192 kHz SAMPLING ENHANCED MULTI-LEVEL, DELTA-SIGMA, AUDIO DIGITAL-TO-ANALOG CONVERTER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCM1750P/PCM1750U | 制造商:BB 制造商全稱:BB 功能描述:PCM1750P. PCM1750U - Dual CMOS 18-Bit Monolithic Audio ANALOG-TO-DIGITAL CONVERTER |
| PCM1750U | 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/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 |
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