參數(shù)資料
型號(hào)： DDC112U/1K
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： ADC
英文描述： 2-CH 20-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28
封裝： GREEN, PLASTIC, SOIC-28
文件頁(yè)數(shù)： 19/34頁(yè)
文件大小： 776K
代理商： DDC112U/1K
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DDC112UG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Dual Current Input 20-Bit RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
DDC112UK 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Dual Current Input 20-Bit RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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(fēng)格:SMD/SMT 封裝 / 箱體: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:模數(shù)轉(zhuǎn)換器 - ADC Dual Current Input 20-Bit RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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