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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： | 19/34页 |
| 文件大小： | 776K |
| 代理商： | DDC112U/1K |
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DDC112
26
SBAS085B
www.ti.com
FIGURE 30. Recommended Shield for DDC112U Layout
Design.
FIGURE 29. Power Supply Connection Options.
DDC112
0.1
F
< 10
10
F
V
S+
One +5V Supply
AV
DD
DV
DD
AV
DD
DV
DD
DDC112
0.1
F
0.1
F
0.1
F
10
F
V
S+
Separate +5V Supplies
10
F
V
DD+
Input shielding practices should be taken into consideration
when designing the circuit layout for the DDC112. The inputs
to the DDC112 are high impedance and extremely sensitive
to extraneous noise. Leakage currents between the PCB
traces can exceed the input bias current of the DDC112 if
shielding is not implemented. Figure 30 illustrates an accept-
able approach to this problem. A PC ground plane is placed
around the inputs of the DDC112. This shield helps minimize
coupled noise into the input pins. Additionally, the pins that
DDC112U
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Digital I/O
and
Digital Power
Digital I/O
and
Digital Power
Shield
external
caps when
used
Analog
Ground
Analog
Power
Shield
external
caps when
used
Analog
Ground
Analog
Ground
IN1
IN2
Analog
Ground
are used for the external integration capacitors should be
guarded by a ground plane when the external capacitors are
used.
The approach above reduces leakage affects by surrounding
these sensitive pins with a low impedance analog ground.
Leakage currents from other portions of the circuit will flow
harmlessly to the low impedance analog ground rather than
into the analog input stage of the DDC112.
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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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