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| 型号： | EVAL-AD7899CBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/16页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7899 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 14 |
| 采样率（每秒）： | 400k |
| 数据接口： | 并联 |
| 输入范围： | ±10 V |
| 在以下条件下的电源（标准）： | 80mW @ 400kSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7899 |
| 已供物品： | 板 |
| 相关产品： | AD7899ARZ-2-ND - IC ADC 14BIT 400KSPS 5V 28SOIC AD7899BRZ-3-ND - IC ADC 14BIT 400KSPS 5V 28SOIC AD7899BRZ-1-ND - IC ADC 14BIT 400KSPS 5V 28SOIC AD7899ARZ-3-ND - IC ADC 14BIT 400KSPS 5V 28SOIC AD7899ARZ-1-ND - IC ADC 14BIT 400KSPS 5V 28SOIC AD7899ARSZ-3-ND - IC ADC 14BIT 400KSPS 5V 28SSOP AD7899ARSZ-2-ND - IC ADC 14BIT 400KSPS 5V 28-SSOP AD7899ARSZ-1REEL7-ND - IC ADC 14BIT 400KSPS 5V 28SSOP AD7899ARZ-1REEL-ND - IC ADC 14BIT 400KSPS 5V 28SOIC AD7899ARSZ-3REEL-ND - IC ADC 14BIT 400KSPS 5V 28SSOP 更多... |
REV. A
AD7899
–13–
FREQUENCY – Hz
–140
dB
0
50000
100000
150000
200000
fs = 400kHz
fIN = 100kHz
SNR = 80.5dB
–120
–100
–80
–60
–40
–20
0
Figure 10. FFT Plot
Effective Number of Bits
The formula given in Equation 1 relates the SNR to the number
of bits. Rewriting the formula, as in Equation 2, it is possible to
obtain a measure of performance expressed in effective number
of bits (N).
N
=
SNR
1.76
6.02
(2)
The effective number of bits for a device can be calculated directly
from its measured SNR. Figure 11 shows a typical plot of effec-
tive number of bits versus frequency for an AD7899.
INPUT FREQUENCY – kHz
0
ENOB
0
100
1000
10000
–55 C
+25 C
1
2
3
4
5
6
7
8
9
10
11
12
13
14
+125 C
Figure 11. Effective Numbers of Bits vs. Frequency
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 . . ., etc. Intermodulation terms are those for
which neither m nor n are equal to zero. For example, the sec-
ond order terms include (fa + fb) and (fa – fb) while the third
order terms include (2fa + fb), (2fa – fb), (fa + 2fb) and (fa – 2fb).
The AD7899 is tested using two input frequencies. 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 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 cal-
culation of the intermodulation distortion is as per the THD
specification where it is the ratio of the rms sum of the indi-
vidual distortion products to the rms amplitude of the fundamental
expressed in dBs. In this case, the input consists of two, equal
amplitude, low distortion sine waves. Figure 12 shows a typical
IMD plot for the AD7899.
FREQUENCY – Hz
–140
dB
0
50000
100000
150000
200000
–120
–100
–80
–60
–40
–20
0
Figure 12. IMD Plot
AC Linearity Plots
The plots in Figure 13 show typical DNL and INL for the
AD7899.
0
2000
4000
16000
1.00
ADC – Code
–1.00
INL
–
LSB
6000
8000
10000 12000
14000
–0.50
0
0.50
0
2000
4000
16000
1.00
ADC – Code
–1.00
DNL
–
LSB
6000
8000
10000 12000
14000
–0.50
0
0.50
Figure 13. Typical DNL and INL Plots
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| EVAL-AD7910CBZ | 功能描述:BOARD EVALUATION FOR AD7910 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 |
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