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參數(shù)資料
| 型號： | ADS7811 |
| 英文描述： | 16-Bit 250kHz Sampling CMOS ANALOG-to-DIGITAL CONVERTER |
| 中文描述： | 16位至250kHz采樣CMOS模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大小： | 186K |
| 代理商： | ADS7811 |
ADS7811
7
TIMING
The timing shown in Figure 2 and Table II is the recom-
mended method of operating the ADS7811. The falling edge
of CS initiates the conversion. During the conversion, the
digital outputs are tri-stated and BUSY is LOW. Near the
end of the conversion, the digital outputs become active with
the most recent conversion result. After a brief delay (see
time t
11
in Figure 2 and Table II), BUSY rises. The rising
edge of BUSY is used to latch the digital result in Figure 1.
R/C AND CS
The R/C (read/convert) and CS signals control the start of
conversion and, when a conversion is not in progress, the
status of the digital outputs D15 through D0. It is possible to
start a conversion by taking CS LOW and then taking R/C
LOW. However, this is not recommended and will result in
a significant decrease in signal-to-noise ratio. This is due to
FIGURE 3. Bus Timing.
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNITS
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t
10
t
11
t
12
CS to R/C Delay
t
2
200
ns
CS to BUSY Delay
40
ns
Aperture Delay
40
ns
μ
s
ns
BUSY LOW
3.5
R/C LOW to CS LOW
100
BUSY HIGH to CS HIGH
250
ns
Bus Access Time
10
83
ns
Bus Relinquish Time
83
ns
Throughput Time
4
μ
s
μ
s
ns
Conversion Time
3.4
Data Valid to BUSY HIGH
25
35
CS to R/C Setup Time
40
ns
TABLE II. Conversion Timing.
FIGURE 2. ADS7811 Timing.
CS
t
9
t
6
t
5
BUSY
t
4
R/C
t
1
t
2
Hi-Z State
D15 - D0
t
11
t
8
Hi-Z State
Acquire
MODE
Convert
t
10
t
3
Acquire
DataValid
the digital outputs tri-stating while the sample and hold
transitions to the hold mode. The change in digital outputs
results in noise being coupled onto the hold capacitor.
If a conversion is not in progress or is just about to finish, the
digital outputs will be active when R/C is HIGH and CS is
LOW. This is shown in Figure 2 and Figure 3. It is possible
to return CS HIGH during the initial part of the conversion
(as is done with R/C) and prevent the digital outputs from
becoming active. At a later time, the digital results could be
read by taking CS LOW. It is also possible to leave R/C
LOW, take CS HIGH during the conversion, and read the
results at a later time by taking R/C HIGH and CS LOW.
Following a conversion, if R/C and CS are both LOW 250ns
after BUSY rises, then a new conversion will be initiated
without allowing the proper acquisition period for the sample
and hold. R/C must remain HIGH or CS must be taken
HIGH within 250ns of BUSY rising.
R/C and CS should remain static prior to that start of
conversion and during the later part of a conversion. To start
t
12
CS
R/C
t
7
t
8
Hi-Z State
D15 - D0
Hi-Z State
MODE
Acquire
DataValid
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7811U | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 250kHz Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7811U | 制造商:Texas Instruments 功能描述:Analog-Digital Converter IC Number of Bi |
| ADS7811U/1K | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 250kHz Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7811U/1KE4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 250kHz Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7811U/1KG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 250kHz Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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