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| 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： | 11/35页 |
| 文件大小： | 653K |
| 代理商： | DDC118IRTCT |
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DDC118
SBAS325B JUNE 2004 REVISED APRIL 2009
www.ti.com
19
Looking at the state diagram, one can see that the CONV
pattern needed to generate a given state progression is not
unique. Upon entering states 1 or 8, the DDC118 remains
in those states until mbsy goes low, independent of CONV.
As long as the m/r/az cycle is underway, the state machine
ignores CONV (see Figure 10, page 14). The top two
signals in Figure 16 are different CONV patterns that
produce the same state. This feature allows flexibility in
generating ncont mode CONV patterns. For example, the
DDC118 Evaluation Fixture operates in the ncont mode by
generating a square wave with pulse width < t6. Figure 17
illustrates operation in the ncont mode using a 50% duty
cycle CONV signal with TINT = 512 CLK periods. Care
must be exercised when using a square wave to generate
CONV. There are certain integration times that must be
avoided since they produce very short intervals for state 2
(or state 7 if CONV is inverted). As seen in the state
diagram, the state progresses from 2 to 3 as soon as
CONV is high. The state machine does not insure that the
duration of state 2 is long enough to properly prepare the
next side for integration (t11). This must be done by the
user with proper timing of CONV. For example, if CONV is
a square wave with TINT = 970 CLK periods, state 2 will
only be 9 CLK periods long; therefore, t11 will not be met.
CONV1
CONV2
23
1
34
4
1
2
State
mbsy
Figure 16. Equivalent CONV Signals in Non-Continuous Mode
CONV
DVALID
23
1
34
41
State
Integration
Status
mbsy
Int B
Int A
Int B
Side A
Data
Side B
Data
Side A
Data
Int A
Figure 17. Non-Continuous Mode Timing with a 50% Duty Cycle CONV Signal
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DDC118IRTCT | 制造商:Texas Instruments 功能描述:IC ADC 20BIT OCTAL 48-VQFN |
| DDC118IRTCT | 制造商:Texas Instruments 功能描述:A/D CONVERTER (A-D) IC ((NW)) |
| DDC118IRTCTG4 | 功能描述:模数转换器 - ADC Octal Current-Input 20-Bit RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| 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 |
| DDC122LH | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:NPN PRE-BIASED SMALL SIGNAL SOT-563 DUAL SURFACE MOUNT TRANSISTOR |
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