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| 型號： | AD7875LPZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT SAMPLING 5V 28-PLCC |
| 產(chǎn)品變化通告： | Conversion Time Change |
| 標準包裝： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 100k |
| 數(shù)據(jù)接口： | 串行，并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 95mW |
| 電壓電源： | 雙 ± |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-LCC（J 形引線） |
| 供應商設備封裝： | 28-PLCC（11.51x11.51） |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個單端，單極 |
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AD7870/AD7875/AD7876
Rev. C | Page 17 of
28
Fourier transform (FFT) plot is generated from which the SNR
data can be obtained. Figure 18 shows a typical 2048 point FFT
plot of the AD7870KN/AD7875KN with an input signal of 25 kHz
and a sampling frequency of 100 kHz. The SNR obtained from
this graph is 72.6 dB. It should be noted that the harmonics are
taken into account when calculating the SNR.
0
–30
–60
–90
–120
–140
0
25
50
07
73
0-
0
18
S
IG
N
AL
AM
P
L
IT
UDE
(
d
B)
FREQUENCY (kHz)
INPUT FREQUENCY = 25kHz
SAMPLE FREQUENCY = 100kHz
SNR = 72.6dB
TA = 25°C
Figure 18. FFT Plot
Effective Number of Bits
The formula given in Equation 1 relates SNR to the number of
bits. Rewriting the formula, as in Equation 2, it is possible to get
a measure of performance expressed in effective number of
bits (N).
02
.
6
76
.
1
=
SNR
N
(2)
The effective number of bits for a device can be calculated
directly from its measured SNR.
Figure 19 shows a typical plot of effective number of bits vs.
frequency for an AD7870KN/AD7875KN with a sampling
frequency of 100 kHz. The effective number of bits typically
falls between 11.7 and 11.85 corresponding to SNR figures of
72.2 and 73.1 dB.
12.0
11.5
11.0
10.5
10.0
0
12.5
18.75
6.25
25.0
31.25
37.5
43.75
50.0
07
73
0-
01
9
E
F
E
CT
IV
E
NUM
BE
R
O
F
BI
T
S
INPUT FREQUENCY (kHz)
SAMPLE FREQUENCY = 100kHz
TA = 25°C
Figure 19. Effective Number of Bits vs. Frequency
Total Harmonic Distortion (THD)
THD is the ratio of the rms sum of harmonics to the rms
value of the fundamental. For the AD7870/AD7875, THD is
defined as
1
2
6
2
5
2
4
2
3
2
log
20
V
THD
+
=
where V1 is the rms amplitude of the fundamental and V2, V3,
V4, V5 and V6 are the rms amplitudes of the second through the
sixth harmonic. The THD is also derived from the FFT plot of
the ADC output spectrum.
Intermodulation Distortion
With inputs consisting of sine waves at two frequencies, fa and
fb, any active device with nonlinearities creates distortion
products at sum and difference frequencies of mfa ± nfb where
m, n = 0, 1, 2, 3, and so on. Intermodulation terms are those
for which neither m nor n are equal to zero. For example, the
second order terms include (fa + fb) and (fa fb), while the
third order terms include (2fa + fb), (2fa fb), (fa + 2fb) and
(fa 2fb).
Using the CCIF standard, where two input frequencies near the
top end of the input bandwidth are used, the second and third
order terms are of different significance. The 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. The calculation of the
intermodulation distortion is as per the THD 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 20 shows a typical IMD plot for
the AD7870/AD7875.
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 is deter-
mined by the largest harmonic in the spectrum, but for parts
where the harmonics are buried in the noise floor the peak is a
noise peak.
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7875LPZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS Complete, 12-Bit, 100 kHz, Sampling ADCs |
| AD7875LPZ-REEL | 功能描述:IC ADC 12BIT SAMPLING 5V 28-PLCC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極 |
| AD7875LPZ-REEL1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS Complete, 12-Bit, 100 kHz, Sampling ADCs |
| AD7875TQ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC CMOS Complete 12B 100kHz Sampling RoHS:否 制造商:Analog Devices 通道數(shù)量: 結(jié)構(gòu): 轉(zhuǎn)換速率: 分辨率: 輸入類型: 信噪比: 接口類型: 工作電源電壓: 最大工作溫度: 安裝風格: 封裝 / 箱體: |
| AD7875TQ/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， 12-Bit |
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