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| 型号： | EVAL-AD7657-1EDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL CONTROL AD7657-1 |
| 标准包装： | 1 |
| 系列： | iCMOS® |
| ADC 的数量： | 6 |
| 位数： | 14 |
| 采样率（每秒）： | 250k |
| 数据接口： | 串行，并联 |
| 输入范围： | ±10 V |
| 在以下条件下的电源（标准）： | 140mW @ 250kSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7657-1 |
| 已供物品： | 板 |
| 相关产品： | AD7657YSTZ-1-RL-ND - IC ADC 14BIT 6CH 250KSPS 64LQFP AD7657YSTZ-1-ND - IC ADC 14BIT 6CH 250KSPS 64LQFP AD7657BSTZ-1-RL-ND - IC ADC 14BIT 6CH 250KSPS 64LQFP AD7657BSTZ-1-ND - IC ADC 14BIT 6CH 250KSPS 64LQFP AD7657YSTZ-REEL-ND - IC ADC 14BIT 6CH 250KSPS 64LQFP AD7657YSTZ-ND - IC ADC 14BIT 6CH 250KSPS 64LQFP AD7657BSTZ-ND - IC ADC 14BIT 6CH 250KSPS 64-LQFP AD7657BSTZ-REEL-ND - IC ADC 14BIT 6CH 250KSPS 64-LQFP |
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AD7656-1/AD7657-1/AD7658-1
Data Sheet
Rev. D | Page 18 of 32
TERMINOLOGY
Integral Nonlinearity (INL)
The maximum deviation from a straight line passing through
the endpoints of the ADC transfer function. The endpoints of
the transfer function are zero scale at a LSB below the first code
transition and full scale at LSB above the last code transition.
Differential Nonlinearity (DNL)
The difference between the measured and the ideal 1 LSB
change between any two adjacent codes in the ADC.
Bipolar Zero Scale Error
The deviation of the midscale transition (all 1s to all 0s) from
the ideal VIN voltage, that is, AGND 1 LSB.
Bipolar Zero Scale Error Matching
The difference in bipolar zero code error between any two input
channels.
Positive Full-Scale Error
The deviation of the last code transition (011 … 110 to 011 … 111)
from the ideal (+4 × VREF 1 LSB, +2 × VREF 1 LSB) after
adjusting for the bipolar zero scale error.
Positive Full-Scale Error Matching
The difference in positive full-scale error between any two input
channels.
Negative Full-Scale Error
The deviation of the first code transition (10 … 000 to 10 … 001)
from the ideal (4 × VREF + 1 LSB, 2 × VREF + 1 LSB) after
adjusting for the bipolar zero scale error.
Negative Full-Scale Error Matching
The difference in negative full-scale error between any two
input channels.
Track-and-Hold Acquisition Time
The track-and-hold amplifier returns to track mode at the end
of the conversion. The track-and-hold acquisition time is the
time required for the output of the track-and-hold amplifier to
reach its final value, within ±1 LSB, after the end of the conversion.
See the Track-and-Hold section for more details.
Signal-to-(Noise + Distortion) Ratio (SINAD)
The measured ratio of signal-to-(noise + distortion) at the
output of the ADC. The signal is the rms amplitude of the
fundamental. Noise is the sum of all nonfundamental signals up
to half the sampling frequency (fSAMPLE/2, excluding dc).
The ratio depends 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
SINAD = (6.02 N + 1.76) dB
Therefore, SINAD is 98 dB for a 16-bit converter, 86.04 dB for a
14-bit converter, and 74 dB for a 12-bit converter.
Total Harmonic Distortion (THD)
The ratio of the rms sum of the harmonics to the fundamental.
For the AD7656-1/AD7657-1/AD7658-1, 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 fSAMPLE/2, 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
ADCs where the harmonics are buried in the noise floor, it is
determined by a noise peak.
Intermodulation Distortion (IMD)
With inputs consisting of sine waves at two frequencies, fa and
fb, any active device with nonlinearities create distortion
products at the sum and difference frequencies of mfa ± nfb,
where m, n = 0, 1, 2, 3. Intermodulation distortion terms are
those for which neither m nor n are equal to 0. 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 AD7656-1/AD7657-1/AD7658-1 are tested using the CCIF
standard in which 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 the intermodulation
distortion is per the THD specification, where it is the ratio of
the rms sum of the individual distortion products to the rms
amplitude of the sum of the fundamentals and is 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,
100 kHz sine wave signal to all unselected input channels and
determining the degree to which the signal attenuates in the
selected channel with a 30 kHz signal.
Power Supply Rejection (PSR)
Variations in power supply affect the full-scale transition but
not the linearity of the converter. Power supply rejection is the
maximum change in the full-scale transition point due to a
change in power supply voltage from the nominal value. See the
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-AD7657CBZ | 功能描述:BOARD EVAL FOR AD7657 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:iCMOS® 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-AD7658-1EDZ | 制造商:AD 制造商全称:Analog Devices 功能描述:250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar, 16-/14-/12-Bit ADC |
| EVAL-AD7658-1SDZ | 功能描述:数据转换 IC 开发工具 Evaluation Control Board RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| EVAL-AD7658CBZ | 功能描述:BOARD EVAL FOR AD7658 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:iCMOS® 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-AD7660CB | 制造商:AD 制造商全称:Analog Devices 功能描述:Evaluation Board AD766X/AD767X |
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