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参数资料
| 型号： | AD7665ASTZRL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 22/23页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT CMOS 5V 48-LQFP |
| 标准包装： | 1 |
| 系列： | PulSAR® |
| 位数： | 16 |
| 采样率（每秒）： | 570k |
| 数据接口： | 串行，并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 74mW |
| 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-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 标准包装 |
| 输入数目和类型： | 4 个单端，单极；4 个单端，双极 |
| 产品目录页面： | 778 (CN2011-ZH PDF) |
| 配用： | EVAL-AD7665CBZ-ND - BOARD EVALUATION FOR AD7665 |
| 其它名称： | AD7665ASTZRLDKR |
REV.
AD7665
–8–
DEFINITION OF SPECIFICATIONS
Internal Nonlinearity Error (INL)
Linearity error refers to the deviation of each individual code
from a line drawn from “negative full scale” through “positive
full scale.” The point used as negative full scale occurs 1/2 LSB
before the first code transition. Positive full scale is defined as a
level 1 1/2 LSB beyond the last code transition. The deviation is
measured from the middle of each code to the true straight line.
Differential Nonlinearity Error (DNL)
In an ideal ADC, code transitions are 1 LSB apart. Differential
nonlinearity is the maximum deviation from this ideal value. It is
often specified in terms of resolution for which no missing codes
are guaranteed.
Full-Scale Error
The last transition (from 011 . . . 10 to 011 ...11 in twos
complement coding) should occur for an analog voltage 1 1/2 LSB
below the nominal full scale (2.499886 V for the ±2.5 V range).
The full-scale error is the deviation of the actual level of the last
transition from the ideal level.
Bipolar Zero Error
The difference between the ideal midscale input voltage (0 V) and
the actual voltage producing the midscale output code.
Unipolar Zero Error
In Unipolar Mode, the first transition should occur at a level
1/2 LSB above analog ground. The unipolar zero error is the
deviation of the actual transition from that point.
Spurious-Free Dynamic Range (SFDR)
The difference, in decibels (dB), between the rms amplitude of
the input signal and the peak spurious signal.
Effective Number of Bits (ENOB)
A measurement of the resolution with a sine wave input. It is
related to S/(N+D) by the following formula:
ENOB
S N
D
dB
=+
[] - )
()
176 602
..
and is expressed in bits.
Total Harmonic Distortion (THD)
The rms sum of the first five harmonic components to the rms
value of a full-scale input signal, expressed in decibels.
Signal-To-Noise Ratio (SNR)
The ratio of the rms value of the actual input signal to the
rms sum of all other spectral components below the Nyquist
frequency, excluding harmonics and dc. The value for SNR is
expressed in decibels.
Signal To (Noise + Distortion) Ratio (S/[N+D])
The ratio of the rms value of the actual input signal to the rms sum
of all other spectral components below the Nyquist frequency,
including harmonics but excluding dc. The value for S/(N+D) is
expressed in decibels.
Aperture Delay
A measure of the acquisition performance measured from the
falling edge of the CNVST input to when the input signal is
held for a conversion.
Transient Response
The time required for the AD7665 to achieve its rated accuracy
after a full-scale step function is applied to its input.
C
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