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參數資料
| 型號： | AD7872TQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | LC2MOS Complete 14-Bit, Sampling ADCs |
| 中文描述： | 1-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP16 |
| 封裝： | HERMETIC SEALED, CERAMIC, DIP-16 |
| 文件頁數： | 11/16頁 |
| 文件大?。?/td> | 344K |
| 代理商： | AD7872TQ |
AD7871/AD7872
–11–
REV. D
microprocessor and the conversion result is read from the ADC
with the following instruction:
ADSP-2100 MR0 = DM(ADC)
T MS32020/C25: IN D,ADC
MR0 = ADSP-2100 MR0 Register
D = Data Memory Address
ADC = AD7871 Address
Figure 17. AD7871 to ADSP-2100 Parallel Interface
Figure 18. AD7871 to TMS32020/C25 Interface
Some applications may require that conversions be initiated by
the microprocessor rather than an external timer. One option is
to decode the AD7871
CONVST
from the address bus so that a
write operation to the ADC starts a conversion. Data is read at
the end of conversion as described earlier. Note, a read opera-
tion must not be attempted during conversion.
Using the CCIF standard where two input frequencies near the
top end of the input bandwidth are used, the second and third or-
der terms are of different significance. T he second order terms
are usually distanced in frequency from the original sine waves
while the third order terms are usually at a frequency close to the
input frequencies. As a result, the second and third order terms
are specified separately. T he calculation of the intermodulation
distortion is as per the T HD specification where it is the ratio of
the rms sum of the individual distortion products to the rms
amplitude of the fundamental expressed in dBs. In this case, the
input consists of two, equal amplitude, low distortion sine waves.
Figure 16 shows a typical IMD plot for the AD7871/AD7872.
Figure 16. IMD Plot
Peak Harmonic or Spurious Noise
Peak Harmonic or Spurious Noise is defined as the ratio of the
rms value of the next largest component in the ADC output
spectrum (up to fs/2 and excluding dc) to the rms value of the
fundamental. Normally, the value of this specification will be
determined by the largest harmonic in the spectrum, but for
parts where the harmonics are buried in the noise floor, peak
will be a noise peak.
MICROPROCE SSOR INT E RFACE
T he AD7871 and AD7872 have a wide variety of interfacing op-
tions. T he AD7871 offers two operating modes and three
data-output formats, while the AD7872 is a dedicated serial
output device. T he fast data access times on the parallel modes
of the AD7871 allow interfacing to the very fast DSPs. T he se-
rial mode on both the AD7871 and AD7872 is compatible with
the serial port structures on all the popular DSPs.
Parallel Read Interfacing
Figures 17 and 18 show interfaces to the ADSP-2100 and the
T MS32020/C25 DSP processors. T he AD7871 is operating in
Mode 1, parallel read for both interfaces. An external timer con-
trols conversion start asynchronously to the microprocessor. At
the end of each conversion the ADC
BUSY
/
INT
interrupts the
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7872TQ/883B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 14-Bit |
| AD7872TQ3 | 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS Complete 14-Bit, Sampling ADCs |
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| AD7873ACP-REEL | 制造商:Analog Devices 功能描述:TOUCH SCREEN DIGITIZER |
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