参数资料
型号: AD7995YRJZ-0RL
厂商: Analog Devices Inc
文件页数: 11/28页
文件大小: 0K
描述: IC ADC 10BIT 4CH I2C SOT23-8
产品变化通告: AD7991,5,9 Offset Error Change 17/Sept/2010
设计资源: Using AD8599 as an Ultralow Distortion Driver for the AD7995 (CN0044)
标准包装: 10,000
位数: 10
采样率(每秒): 1M
数据接口: I²C,串行
转换器数目: 1
功率耗散(最大): 4.68mW
电压电源: 单电源
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: SOT-23-8
供应商设备封装: SOT-23-8
包装: 带卷 (TR)
输入数目和类型: 4 个单端,单极
配用: EVAL-AD7995EBZ-ND - BOARD EVAL FOR AD7995
AD7991/AD7995/AD7999
Rev. B | Page 19 of 28
For ac applications, removing high frequency components from
the analog input signal is recommended by use of an RC band-
pass filter on the relevant analog input pin. In applications
where harmonic distortion and signal-to-noise ratio are critical,
the analog input should be driven from a low impedance
source. Large source impedances significantly affect the ac
performance of the ADC. This may necessitate the use of an
input buffer amplifier. The choice of the op amp is a function
of the particular application.
When no amplifier is used to drive the analog input, the source
impedance should be limited to low values. The maximum
source impedance depends on the amount of THD that can be
tolerated. THD increases as the source impedance increases and
performance degrades. Figure 23 shows the THD vs. the analog
input signal frequency for different source impedances at a
supply voltage of 5 V.
56
5.1k
2k
1.3k
240
1
10
100
ANALOG INPUT FREQUENCY (kHz)
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
T
HD
(
d
B)
VDD = 5V
VREF = VDD
TEMPERATURE = TA
fSCL = 1.7MHz
0
64
61
-02
5
Figure 23. THD vs. Analog Input Frequency for Various Source Impedances
for VDD = 5 V, fSCL = 1.7 MHz Without Clock Stretching
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