Having FSCLK = 18 MHz and a thro" />
參數(shù)資料
型號： AD7440BRTZ-REEL7
廠商： Analog Devices Inc
文件頁數(shù)： 16/29頁
文件大小： 0K
描述： IC ADC 10BIT DIFF 1MSPS SOT23-8
標(biāo)準(zhǔn)包裝： 1
位數(shù)： 10
采樣率（每秒）： 1M
數(shù)據(jù)接口： DSP，MICROWIRE?，QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 9.25mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°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： 1 個差分，單極
其它名稱： AD7440BRTZ-REEL7DKR
AD7440/AD7450A
Rev. C | Page 22 of 28
Timing Example 1
Having FSCLK = 18 MHz and a throughput rate of 1 MSPS gives a
cycle time of
1/Throughput = 1/1,000,000 = 1 μs
A cycle consists of
t2 + 12.5(1/FSCLK) + tACQ = 1 μs
Therefore, if t2 = 10 ns
10 ns + 12.5(1/18 MHz) + tACQ = 1 μs
tACQ = 296 ns
This 296 ns satisfies the requirement of 290 ns for tACQ.
From Figure 40, tACQ comprises
2.5(1/FSCLK) + t8 + tQUIET
where t8 = 35 ns. This allows a value of 122 ns for tQUIET,
satisfying the minimum requirement of 60 ns.
Timing Example 2
Having FSCLK = 5 MHz and a throughput rate of 315 kSPS gives a
cycle time of
1/Throughput = 1/315,000 = 3.174 μs
A cycle consists of
t2 + 12.5(1/FSCLK) + tACQ = 3.174 μs
Therefore, if t2 is 10 ns
10 ns + 12.5(1/5 MHz) + tACQ = 3.174 μs
tACQ = 664 ns
This 664 ns satisfies the requirement of 290 ns for tACQ.
From Figure 40, tACQ comprises
2.5(1/FSCLK) + t8 + tQUIET
where t8 = 35 ns. This allows a value of 129 ns for tQUIET,
satisfying the minimum requirement of 60 ns.
As in this example and with other slower clock values, the signal
may already be acquired before the conversion is complete, but
it is still necessary to leave 60 ns minimum tQUIET between
conversions. In Timing Example 2, the signal should be fully
acquired at approximately Point C in Figure 40.
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