參數(shù)資料
型號(hào)： MAX189
廠商： Maxim Integrated Products, Inc.
元件分類： ADC
英文描述： +5V, Low-Power, 12-Bit Serial ADCs(8.5μs轉(zhuǎn)換時(shí)間，單通道，串行12位A/D轉(zhuǎn)換器)
中文描述： +5V、低功耗、12位串行ADC
文件頁(yè)數(shù)： 14/20頁(yè)
文件大?。?/td> 177K
代理商： MAX189
M
+5V, Low-Power, 12-Bit S erial ADCs
14
______________________________________________________________________________________
11.8
11.6
11.4
11.2
11.0
10.8
10.6
10.4
10.2
1
10
100
1000
(UNDERSAMPLED)
E
INPUT FREQUENCY (kHz)
12.0
12.2
MAX187
MAX189
CS
SCLK
DOUT
I/O
SCK
MISO
+5V
SS
a. SPI
MAX187
MAX189
CS
SCLK
DOUT
CS
SCK
MISO
+5V
SS
b. QSPI
MAX187
MAX189
CS
SCLK
DOUT
I/O
SK
SI
c. MICROWIRE
Figure 13. Common Serial-Interface Connections to the
MAX187/MAX189
Figure 12. Effective Bits vs. Input Frequency
The effective resolution (effective number of bits) the
ADC provides can be determined by transposing the
above equation and substituting in the measured
SINAD: N = (SINAD - 1.76)/6.02. Figure 12 shows the
effective number of bits as a function of the input fre-
quency for the MAX187/MAX189.
T otal Harmonic Distortion
If a pure sine wave is sampled by an ADC at greater
than the Nyquist frequency, the nonlinearities in the
ADC’s transfer function create harmonics of the input
frequency 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:
THD = 20log
√
V
22
+ V
32
+ V
42
+ … V
N2
V
1
where V
1
is the fundamental RMS amplitude, and V
2
through V
are the amplitudes of the 2nd through Nth
harmonics. The THD specification in the Electrical
C haracteristics includes the 2nd through 5th
harmonics.
相關(guān)PDF資料
PDF描述
MAX187ACWE Fixed-Point Digital Signal Processor 288-BGA MICROSTAR
MAX187AMJA Fixed-Point Digital Signal Processor 288-BGA MICROSTAR
MAX187CEPA +5V, Low-Power, 12-Bit Serial ADCs
MAX189CEPA 031-0560-161
MAX189BEWE CANMS3121E16-26SF0
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