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參數(shù)資料
| 型號： | MAX194 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 14-Bit, 85ksps ADC with 10礎(chǔ) Shutdown(85ksps,單通道,14位串行A/D轉(zhuǎn)換器) |
| 中文描述： | 14位、85ksps ADC，帶有10µ關(guān)斷 |
| 文件頁數(shù)： | 23/24頁 |
| 文件大?。?/td> | 267K |
| 代理商： | MAX194 |
M
14-Bit, 85ksps ADC with 10μA S hutdown
______________________________________________________________________________________
23
sure of the ADC’s usefulness. Figure 26 shows the
effective number of bits as a function of the MAX194’s
input frequency calculated from the SINAD.
T otal Harmonic Distortion
If a pure sine wave is input to an ADC, AC integral non-
linearity (INL) of an ADC’s transfer function results in
harmonics of the input frequency being present in the
sampled output data.
Total Harmonic Distortion (THD) is the ratio of the RMS
sum of all the harmonics (in the frequency band above
DC and below one-half the sample rate, but not includ-
ing the DC component) to the RMS amplitude of the
fundamental frequency. This is expressed as follows:
√
(V
2
2
+ V
3
2
+ V
4
2
+ ... + V
N
2
)
V1
THD = 20log ——————————————
where V
1
is the fundamental RMS amplitude, and V
2
through V
N
are the amplitudes of the 2nd through Nth
harmonics. The THD specification in the Electrical
Characteristics includes the 2nd through 5th harmon-
ics. In the MAX194, this distortion is caused primarily
by the changes in on-resistance of the AIN sampling
switches with changing input voltage. These resistance
changes, together with the DAC’s capacitance (which
can also vary with input voltage), cause a varying time
delay for AC signals, which causes significant distortion
at moderately high frequencies (Figure 27).
CK
(2 x CLK)
J
Q
+5V
K
CLK
BP/UP/SHDN
CK
2 x CLK
1/2 74HC73
CLOCK SHUTDOWN
Q
(CLK)
J
(CLOCK SHUTDOWN)
MAX194
Figure 24. Circuit to Stop Free-Running Asynchronous CLK
-150
-130
-110
-90
0
5
10
20
25
40
-30
-50
-70
-10
FREQUENCY (kHz)
S
15
30
35
f
IN
= 1kHz
f
S
= 85kHz
T
A
= +25°C
Figure 25. MAX194 FFT Plot
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