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| 型号： | AD7822BRZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 27/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 8BIT 1CHAN 2MSPS 20SOIC |
| 标准包装： | 1,000 |
| 位数： | 8 |
| 采样率（每秒）： | 2M |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 36mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC W |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个单端，单极 |
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AD7822/AD7825/AD7829
Rev. C | Page 8 of 28
TERMINOLOGY
Signal-to-(Noise + Distortion) Ratio
The measured ratio of signal-to-(noise + distortion) at the
output of the analog-to-digital converter. The signal is the rms
amplitude of the fundamental. Noise is the rms sum of all
nonfundamental signals up to half the sampling frequency
(fS/2), excluding dc. The ratio is dependent upon the number of
quantization levels in the digitization process: the more levels,
the smaller the quantization noise. The theoretical signal-to-(noise
+ distortion) ratio for an ideal N-bit converter with a sine wave
input is given by
Signal-to-(Noise + Distortion) = (6.02 N + 1.76) dB
Thus, for an 8-bit converter, this is 50 dB.
Total Harmonic Distortion (THD)
The ratio of the rms sum of harmonics to the fundamental. For
the AD7822/AD7825/AD7829, it is defined as
1
6
5
3
2
V
THD
2
4
2
log
20
(dB)
+
=
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 harmonics.
Peak Harmonic or Spurious Noise
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, it is a
noise peak.
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).
The AD7822/AD7825/AD7829 are tested using the CCIF
standard, where two input frequencies near the top end of the
input bandwidth are used. 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,
and 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 decibels (dB).
Channel-to-Channel Isolation
A measure of the level of crosstalk between channels. It is
measured by applying a full-scale 20 kHz sine wave signal to
one input channel and determining how much that signal is
attenuated in each of the other channels. The figure given is the
worst case across all four or eight channels of the AD7825 and
AD7829, respectively.
Relative Accuracy or Endpoint Nonlinearity
The maximum deviation from a straight line passing through
the endpoints of the ADC transfer function.
Differential Nonlinearity
The difference between the measured and the ideal one LSB
change between any two adjacent codes in the ADC.
Offset Error
The deviation of the 128th code transition (01111111) to
(10000000) from the ideal, that is, VMID.
Offset Error Match
The difference in offset error between any two channels.
Zero-Scale Error
The deviation of the first code transition (00000000) to
(00000001) from the ideal; that is, VMID 1.25 V + 1 LSB (VDD =
5 V ± 10%), or VMID 1.0 V + 1 LSB (VDD = 3 V ± 10%).
Full-Scale Error
The deviation of the last code transition (11111110) to (11111111)
from the ideal; that is, VMID + 1.25 V 1 LSB (VDD = 5 V ± 10%),
or VMID + 1.0 V 1 LSB (VDD = 3 V ± 10%).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7822BRZ-REEL1 | 制造商:AD 制造商全称:Analog Devices 功能描述:3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs |
| AD7822BRZ-REEL7 | 功能描述:IC ADC 8BIT 1CH 2MSPS 20-SOIC 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:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| AD7822BRZ-REEL71 | 制造商:AD 制造商全称:Analog Devices 功能描述:3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs |
| AD7823 | 制造商:AD 制造商全称:Analog Devices 功能描述:2.7 V to 5.5 V, 4.5 us, 8-Bit ADC in 8-Lead microSOIC/DIP |
| AD7823YN | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 8-bit Serial 8-Pin PDIP 制造商:Rochester Electronics LLC 功能描述:8-BIT SERIAL SINGLE ADC I.C. - Bulk 制造商:Analog Devices 功能描述:IC 8BIT ADC 7823 DIP8 |
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