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参数资料
| 型号： | DDC118IRTCT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 8-CH 20-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PQCC48 |
| 封装： | GREEN, PLASTIC, QFN-48 |
| 文件页数： | 16/35页 |
| 文件大小： | 653K |
| 代理商： | DDC118IRTCT |
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DDC118
SBAS325B JUNE 2004 REVISED APRIL 2009
www.ti.com
23
RETRIEVAL BEFORE CONV TOGGLES
(CONTINUOUS MODE)
Date retrieval before CONV toggles is the most
straightforward method. Data retrieval begins soon after
DVALID goes low and finishes before CONV toggles, as
shown in Figure 23. For best performance, data retrieval
must stop t28 before CONV toggles. This method is most
appropriate for longer integration times. The maximum
time available for readback is TINT – t27 – t28. For DCLK =
10MHz and CLK = 4MHz, the maximum number of
DDC118s that can be daisy-chained together (FORMAT =
high) is calculated by Equation 1:
T
INT
* 355.125ms
160
t
DCLK
NOTE: 128
τDCLK is used for FORMAT = low.
where
τDCLK is the period of the data clock. For example,
if TINT = 1000s and DCLK = 10MHz, the maximum
number of DDC118s (FORMAT = high) is shown in
Equation 2:
1000
ms * 355.125ms
(160)(100ns)
+ 40.30 40DDC118s
(or 50 for FORMAT = low).
SYMBOL
DESCRIPTION
CLK = 4MHz, CLK_4X = 0
CLK = 4.8MHz, CLK_4X = 0
UNITS
SYMBOL
DESCRIPTION
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
t27
Cont Mode Data Ready
345.00
± 0.125
287.5
± 0.104
s
t28
Data Retrieval Shutdown Before Edge of CONV
10
s
Figure 23. Readback Before CONV Toggles
(1)
(2)
…
Side B
Data
Side A
Data
T
INT
T
INT
t
27
t
28
CONV
DVALID
DCLK
DOUT
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相关代理商/技术参数 |
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| DDC118IRTCT | 制造商:Texas Instruments 功能描述:IC ADC 20BIT OCTAL 48-VQFN |
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| DDC11XEVM-PDK | 功能描述:数据转换 IC 开发工具 DDC11xEVM-PDK Eval Mod RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
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