參數(shù)資料
型號(hào)： AD7863BRZ-3
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 7/24頁(yè)
文件大?。?/td> 0K
描述： IC ADC 14BIT DUAL 2CHAN 28SOIC
標(biāo)準(zhǔn)包裝： 27
位數(shù)： 14
采樣率（每秒）： 175k
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 2
功率耗散（最大）： 94.5mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 28-SOIC W
包裝： 管件
輸入數(shù)目和類(lèi)型： 4 個(gè)單端，單極；4 個(gè)單端，雙極
AD7863
Rev. B | Page 15 of 24
TOTAL HARMONIC DISTORTION (THD)
Total harmonic distortion (THD) is the ratio of the rms sum of
harmonics to the rms value of the fundamental. For the
AD7863, THD is defined as
()
1
5
4
3
2
V
dB
THD
2
log
20
+
=
(3)
where:
V1 is the rms amplitude of the fundamental.
V2, V3, V4, and V5 are the rms amplitudes of the second through
the fifth harmonic.
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 . . . Intermodulation terms are those for which
neither m nor n is equal to zero. For example, the second order
terms include (fa + fb) and (fa fb) and the third order terms
include (2fa + fb), (2fa fb), (fa + 2fb), and (fa 2fb).
In this case, 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 15 shows a typical IMD plot for the AD7863.
0
1020
30
405060
708090
06
41
1-
0
15
(d
B
)
FREQUENCY (kHz)
0
–130
–120
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
–140
–150
INPUT FREQUENCIES
F1 = 50.13kHz
F2 = 49.13kHz
fSAMPLE = 175kHz
IMD
2ND ORDER TERM
–98.21dB
3RD ORDER TERM
–93.91dB
Figure 15. IMD Plot
PEAK HARMONIC OR SPURIOUS NOISE
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
determined 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.
DC LINEARITY PLOT
Figure 16 and Figure 17 show typical DNL and INL plots for
the AD7863.
0
2048
4096
6144
8192
10240 12288 14336 16383
06
41
1-
0
16
DNL
E
RRO
R
(
L
S
B)
ADC CODE
1.0
0.5
0
–0.5
–1.0
Figure 16. DC DNL Plot
0
2048
4096
6144
8192
10240 12288 14336 16383
064
11
-01
7
INL
E
RRO
R
(
L
S
B)
ADC CODE
1.0
0.5
0
–0.5
–1.0
Figure 17. DC INL Plot
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