參數(shù)資料
型號: AD7995YRJZ-0500RL7
廠商: Analog Devices Inc
文件頁數(shù): 11/28頁
文件大?。?/td> 0K
描述: IC ADC 10BIT 4CH SAR I2C SOT23-8
產(chǎn)品變化通告: AD7991,5,9 Offset Error Change 17/Sept/2010
設(shè)計(jì)資源: Using AD8599 as an Ultralow Distortion Driver for the AD7995 (CN0044)
標(biāo)準(zhǔn)包裝: 1
位數(shù): 10
采樣率(每秒): 1M
數(shù)據(jù)接口: I²C,串行
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 4.68mW
電壓電源: 單電源
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: SOT-23-8
供應(yīng)商設(shè)備封裝: SOT-23-8
包裝: 標(biāo)準(zhǔn)包裝
輸入數(shù)目和類型: 4 個(gè)單端,單極
產(chǎn)品目錄頁面: 780 (CN2011-ZH PDF)
配用: EVAL-AD7995EBZ-ND - BOARD EVAL FOR AD7995
其它名稱: AD7995YRJZ-0500RL7DKR
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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