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参数资料
| 型号： | EVAL-AD7991EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7991 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 1M |
| 数据接口： | 串行 |
| 输入范围： | 0 ~ Vdd |
| 在以下条件下的电源（标准）： | 4.4mW @ 5.5V，3.4MHz |
| 工作温度： | -40°C ~ 125°C |
| 已用 IC / 零件： | AD7991 |
| 已供物品： | 板，缆线，CD |
| 产品目录页面： | 780 (CN2011-ZH PDF) |
| 相关产品： | AD7991YRJZ-1RL-ND - IC ADC 12BIT 4CH I2C SOT23-8 AD7991YRJZ-0RL-ND - IC ADC 12BIT 4CH I2C SOT23-8 AD7991YRJZ-1500RL7DKR-ND - IC ADC 12BIT 4CH SAR I2C SOT23-8 AD7991YRJZ-0500RL7DKR-ND - IC ADC 12BIT 4CH SAR I2C SOT23-8 AD7991YRJZ-1500RL7CT-ND - IC ADC 12BIT 4CH SAR I2C SOT23-8 AD7991YRJZ-0500RL7CT-ND - IC ADC 12BIT 4CH SAR I2C SOT23-8 AD7991YRJZ-1500RL7TR-ND - IC ADC 12BIT 4CH SAR I2C SOT23-8 AD7991YRJZ-0500RL7TR-ND - IC ADC 12BIT 4CH SAR I2C SOT23-8 |
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AD7991/AD7995/AD7999
Rev. B | Page 16 of 28
TERMINOLOGY
Signal-to-Noise and Distortion (SINAD) Ratio
The measured ratio of signal-to-noise and distortion at the output
of the ADC. The signal is the rms amplitude of the fundamental.
Noise is the sum of the nonfundamental signals excluding dc,
up to half the sampling frequency (fS/2). The ratio is dependent
on the number of quantization levels in the digitization process:
the more levels, the smaller the quantization noise. The theoretical
SINAD 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
Therefore, SINAD is 49.92 dB for an 8-bit converter, 61.96 dB
for a 10-bit converter, and 74 dB for a 12-bit converter.
Total Harmonic Distortion (THD)
The ratio of the rms sum of harmonics to the fundamental. For
the AD7991/AD7995/AD7999, it is defined as
1
6
5
4
3
2
V
THD
2
log
20
)
dB
(
+
=
where:
V1 is the rms amplitude of the fundamental.
V2, V3, V4, V5, and V6 are the rms amplitudes of the second
through 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. Typically, the value of this specification
is determined by the largest harmonic in the spectrum, but for
ADCs where the harmonics are buried in the noise floor, the
largest harmonic may be 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, and so on. Intermodulation distortion terms
are those for which neither m nor n equals 0. For example,
second-order terms include (fa + fb) and (fa fb), and
third-order terms include (2fa + fb), (2fa fb), (fa + 2fb), and
(fa 2fb).
The AD7991/AD7995/AD7999 are tested using the CCIF standard,
where two input frequencies near the maximum input bandwidth
are used. In this case, 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 intermodulation distortion is, like the THD
specification, the ratio of the rms sum of the individual distortion
products to the rms amplitude of the sum of the fundamentals,
expressed in decibels.
Channel-to-Channel Isolation
Channel-to-channel isolation is a measure of the level of
crosstalk between any two channels. It is measured by applying
a full-scale sine wave signal to all unselected input channels and
then determining the degree to which the signal attenuates in
the selected channel with a 10 kHz signal. The frequency of the
signal in each of the unselected channels is increased from 2 kHz
up to 92 kHz. Figure 14 shows the worst-case across all four
channels for the AD7991.
Full-Power Bandwidth
The input frequency at which the amplitude of the reconstructed
fundamental is reduced by 0.1 dB or 3 dB for a full-scale input.
Integral Nonlinearity
The maximum deviation from a straight line passing through
the endpoints of the ADC transfer function. The endpoints are
at zero scale (a point 1 LSB below the first code transition) and
full scale (a point 1 LSB above the last code transition).
Differential Nonlinearity
The difference between the measured and the ideal 1 LSB
change between any two adjacent codes in the ADC.
Offset Error
The deviation of the first code transition (00 … 000 to
00 … 001) from the ideal—that is, AGND + 1 LSB.
Offset Error Match
The difference in offset error between any two channels.
Gain Error
The deviation of the last code transition (111 … 110 to
111 … 111) from the ideal (that is, VREF 1 LSB) after
the offset error has been adjusted out.
Gain Error Match
The difference in gain error between any two channels.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-AD7991EBZ | 制造商:Analog Devices 功能描述:AD7991, ADC, I2C, EVALUATION BOARD |
| EVAL-AD7992CB | 制造商:AD 制造商全称:Analog Devices 功能描述:2-Channel, 12-Bit ADC with I2C-Compatible |
| EVAL-AD7992EBZ | 功能描述:BOARD EVALUATION FOR AD7992 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| EVAL-AD7993CB | 制造商:Analog Devices 功能描述:EVALUATION CONTROL BOARD. - Bulk |
| EVAL-AD7993CBZ | 制造商:Analog Devices 功能描述:EVALUATION CONTROL BOARD. - Bulk |
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