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參數(shù)資料
| 型號： | ADC10064 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 10-Bit 600 ns A/D Converter with Input Multiplexer and Sample/Hold |
| 中文描述： | 10位600納秒的A / D輸入多路復用器和轉換器采樣/保持 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大小： | 333K |
| 代理商： | ADC10064 |
Applications Information
(Continued)
digitize AC signals without significant spectral errors and
without adding noise to the digitized signal. Dynamic charac-
teristics such as signal-to-noise ratio (SNR) and total har-
monic distortion (THD), are quantitative measures of this ca-
pability.
An A/D converter’s AC performance can be measured using
Fast Fourier Transform (FFT) methods. A sinusoidal wave-
form is applied to the A/D converter’s input, and the trans-
form is then performed on the digitized waveform. The re-
sulting spectral plot might look like the ones shown in the
typical performance curves. The large peak is the fundamen-
tal frequency, and the noise and distortion components (if
any are present) are visible above and below the fundamen-
tal frequency. Harmonic distortion components appear at
whole multiples of the input frequency. Their amplitudes are
combined as the square root of the sum of the squares and
compared to the fundamental amplitude to yield the THD
specification. Typical values for THD are given in the table of
Electrical Characteristics.
Signal-to-noise ratio is the ratio of the amplitude at the fun-
damental frequency to the rms value at all other frequencies,
excluding any harmonic distortion components. Typical val-
ues are given in the Electrical Characteristics table. An alter-
native definition of signal-to-noise ratio includes the distor-
tion components along with the random noise to yield a
signal-to-noise-plus-distortion ratio, or S/(N + D).
The THD and noise performance of the A/D converter will
change with the frequency of the input signal, with more dis-
tortion and noise occurring at higher signal frequencies. One
way of describing theA/D’s performance as a function of sig-
nal frequency is to make a plot of “effective bits” versus fre-
quency. An ideal A/D converter with no linearity errors or
self-generated noise will have a signal-to-noise ratio equal to
(6.02n + 1.76) dB, where n is the resolution in bits of the A/D
converter. A real A/D converter will have some amount of
noise and distortion, and the effective bits can be found by:
where S/(N + D) is the ratio of signal to noise and distortion,
which can vary with frequency.
As an example, an ADC10061 with a 5 V
, 100 kHz sine
wave
input
signal
will
signal-to-noise-plus-distortion ratio of 59.2 dB, which is
equivalent to 9.54 effective bits. As the input frequency in-
creases, noise and distortion gradually increase, yielding a
plot of effective bits or S/(N + D) as shown in the typical per-
formance curves.
typically
have
a
8.0 SPEED ADJUST
In applications that require faster conversion times, the
Speed Adjust pin (pin 14 on the ADC10062, pin 17 on the
ADC10064) can significantly reduce the conversion time.
The speed adjust pin is connected to an on-chip current
source that determines the converter’s internal timing. By
connecting a resistor between the speed adjust pin and
ground as shown in Figure 4 the internal programming cur-
rent is increased, which reduces the conversion time. As an
example, an 18k resistor reduces the conversion time of a
typical part from 600 ns to 350 ns with no significant effect on
linearity. Using smaller resistors to further decrease the con-
version time is possible as well, although the linearity will be-
gin to degrade somewhat (see curves). Note that the resistor
value needed to obtain a given conversion time will vary from
part to part, so this technique will generally require some
“tweaking” to obtain satisfactory results.
www.national.com
12
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相關代理商/技術參數(shù) |
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|---|---|
| ADC10064 WAF | 制造商:Texas Instruments 功能描述: |
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| ADC10064BIWM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Ended Data Acquisition System |
| ADC10064CIWM | 功能描述:模數(shù)轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADC10064CIWM/NOPB | 功能描述:模數(shù)轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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