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参数资料
| 型号： | DDC112U/1K |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 2-CH 20-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28 |
| 封装： | GREEN, PLASTIC, SOIC-28 |
| 文件页数： | 8/34页 |
| 文件大小： | 776K |
| 代理商： | DDC112U/1K |
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DDC112
16
SBAS085B
www.ti.com
FIGURE 13. Non-Continuous Mode Timing.
Ncont Mode
Figure 13 illustrates operation in the ncont mode. The
integrations come in pairs (that is, sides A/B or sides B/A)
followed by a time during which no integrations occur.
During that time, the previous integrations are being mea-
sured, reset and auto-zeroed. Before the DDC112 can
advance to states 3 or 6, both sides A and B must be
finished with the m/r/az cycle which takes time t10. When the
m/r/az cycles are completed, time t11 is needed to prepare
the next side for integration. This time is required for the
ncont mode because the m/r/az cycle of the ncont mode is
slightly different from that of the cont mode. After the first
integration ends, DVALID goes LOW in time t8. This is the
same time as in the cont mode. The second data will be
ready in time t9 after the first data is ready. One result of the
naming convention used in this application bulletin is that
when the DDC112 is operating in the
ncont mode, it passes
through both
ncont mode states and cont mode states. For
example, in Figure 13, the state pattern is 3, 4, 1, 2, 3, 4, 1,
2, 3, 4...where 3 and 4 are cont mode states.
Ncont mode
by definition means that for some portion of the time, neither
side A nor B is integrating. States that perform an integration
are labeled
cont mode states while those that do not are
called
ncont mode states. Since integrations are performed
in the ncont mode, just not continuously, some cont mode
states must be used in an ncont mode state pattern.
SYMBOL
DESCRIPTION
VALUE (CLK = 10MHz)
VALUE (CLK = 15MHz)
t8
1st ncont mode data ready.
421.2
±0.3s
280.8
±0.2s
t9
2nd ncont mode data ready.
454.8
s
303.2
s
t10
Ncont mode m/r/az cycle.
910.8
s
607.2
s
t11
Prepare side for integration.
≥ 24.0s
23
1
34
4
1
2
Int B
Int A
Int B
Int A
m/r/az B
m/r/az A
m/r/az B
CONV
State
mbsy
m/r/az
Status
Integration
Status
DVALID
t
10
t
9
t
11
t
8
Side A
Data
Side B
Data
Side A
Data
Side B
Data
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DDC112UG4 | 功能描述:模数转换器 - ADC Dual 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 |
| DDC112UK | 功能描述:模数转换器 - ADC Dual 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 |
| DDC112UK | 制造商:Texas Instruments 功能描述:DUAL CURRENT INPUT 20 BIT ANALOG/DIGITAL |
| DDC112UK | 制造商:Texas Instruments 功能描述:20BIT ADC DUAL SMD SOIC28 112 |
| DDC112UK/1K | 功能描述:模数转换器 - ADC Dual 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 |
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