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参数资料
| 型号： | EVAL-AD7940CBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 19/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION AD7940 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 14 |
| 采样率（每秒）： | 100k |
| 数据接口： | 串行 |
| 输入范围： | 0 ~ Vdd |
| 在以下条件下的电源（标准）： | 17mW @ 100kSPS & 5V |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7940 |
| 已供物品： | 板 |
| 相关产品： | AD7940BRJZ-REEL7DKR-ND - IC ADC 14BIT 100KSPS SOT-23-6 AD7940BRJZ-REEL7CT-ND - IC ADC 14BIT 100KSPS SOT-23-6 AD7940BRJZ-REEL7TR-ND - IC ADC 14BIT 100KSPS SOT-23-6 AD7940BRM-ND - IC ADC 14BIT UNIPOLAR 8-MSOP AD7940BRM-REEL7TR-ND - IC ADC 14BIT UNIPOLAR 8-MSOP |
AD7940
Rev. A | Page 8 of 20
TERMINOLOGY
Integral Nonlinearity
This is 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, a point 1/2
LSB below the first code transition, and full scale, a point 1/2
LSB above the last code transition.
Differential Nonlinearity
This is the difference between the measured and the ideal 1 LSB
change between any two adjacent codes in the ADC.
Offset Error
This is the deviation of the first code transition (00 . . . 000) to
(00 . . . 001) from the ideal, i.e., AGND + 1 LSB.
Gain Error
This is the deviation of the last code transition (111 . . . 110) to
(111 . . . 111) from the ideal (i.e., VREF 1 LSB) after the offset
error has been adjusted out.
Track-and-Hold Acquisition Time
The track-and-hold amplifier returns to track mode at the end
of 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 Serial Interface section for more details.
Signal-to-(Noise + Distortion) Ratio
This is 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 (fS/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 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 a 14-bit converter, this is 86.04 dB.
Total Harmonic Distortion (THD)
THD is the ratio of the rms sum of harmonics to the
fundamental. For the AD7940, it is defined as
1
2
6
2
5
2
4
2
3
2
V
log
20
(dB)
+
=
THD
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
Peak 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, 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 will
be a noise peak.
Intermodulation Distortion
With inputs consisting of sine waves at two frequencies, fa and fb,
any active device with nonlinearities will create distortion
products at 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 zero. For example, the second-
order terms include (fa + fb) and (fa fb), while the third-order
terms include (2fa + fb), (2fa fb), (fa + 2fb), and (fa 2fb).
The AD7940 is tested using the CCIF standard where two input
frequencies near the top end of the input bandwidth are used.
In this case, 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 sum of the fundamentals expressed in dBs.
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| EVAL-AD7942CB | 功能描述:BOARD EVALUATION FOR AD7942 RoHS:否 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:PulSAR® 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-AD7942SDZ | 功能描述:BOARD EVAL FOR AD7942 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:PulSAR® 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-AD7944EBZ | 功能描述:BOARD EVAL FOR AD7944 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:PulSAR® 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-AD7946CBZ | 功能描述:BOARD EVALUATION FOR AD7946 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:PulSAR® 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-AD7946SDZ | 功能描述:BOARD EVAL FOR AD7946 RoHS:否 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 |
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