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參數(shù)資料
| 型號： | DDC112U/1K |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 2-CH 20-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28 |
| 封裝： | GREEN, PLASTIC, SOIC-28 |
| 文件頁數(shù)： | 10/34頁 |
| 文件大?。?/td> | 776K |
| 代理商： | DDC112U/1K |
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DDC112
18
SBAS085B
www.ti.com
FIGURE 16. Equivalent CONV Signals in Non-Continuous Mode.
FIGURE 17. Non-Continuous Mode Timing with a 50% Duty Cycle CONV Signal.
CONV1
CONV2
23
1
34
4
1
2
State
mbsy
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
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 DDC112 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 9). The top two signals are
different CONV patterns that produce the same state.
This feature can be a little confusing at first, but it does allow
flexibility in generating ncont mode CONV patterns. For
example, the DDC112 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 = 1620 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 = 3042 CLK periods, state 2 will only be 18
CLK periods long, therefore, t11 will not be met.
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| DDC112UG4 | 功能描述:模數(shù)轉換器 - ADC Dual Current Input 20-Bit RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 |
| DDC112UK | 功能描述:模數(shù)轉換器 - ADC Dual Current Input 20-Bit RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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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| DDC112UK/1K | 功能描述:模數(shù)轉換器 - ADC Dual Current Input 20-Bit RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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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