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参数资料
| 型号： | AD7863ARSZ-2REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT DUAL 2CHAN 28SSOP |
| 标准包装： | 500 |
| 位数： | 14 |
| 采样率（每秒）： | 175k |
| 数据接口： | 并联 |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 94.5mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 4 个单端，单极；4 个单端，双极 |
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
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7863ARSZ-2REEL71 | 制造商:AD 制造商全称:Analog Devices 功能描述:Simultaneous Sampling Dual 175 kSPS 14-Bit ADC |
| AD7863ARSZ-3 | 功能描述:IC ADC 14BIT DUAL 2CHAN 28SSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 其它有关文件:TSA1204 View All Specifications 标准包装:1 系列:- 位数:12 采样率（每秒）:20M 数据接口:并联 转换器数目:2 功率耗散（最大）:155mW 电压电源:模拟和数字 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-TQFP 供应商设备封装:48-TQFP（7x7） 包装:Digi-Reel® 输入数目和类型:4 个单端，单极；2 个差分，单极 产品目录页面:1156 (CN2011-ZH PDF) 其它名称:497-5435-6 |
| AD7863ARSZ-31 | 制造商:AD 制造商全称:Analog Devices 功能描述:Simultaneous Sampling Dual 175 kSPS 14-Bit ADC |
| AD7863ARSZ-3REEL | 功能描述:IC ADC 14BIT DUAL 2CHAN 28SSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| AD7863ARSZ-3REEL1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Simultaneous Sampling Dual 175 kSPS 14-Bit ADC |
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