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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： | 18/34页 |
| 文件大小： | 776K |
| 代理商： | DDC112U/1K |
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DDC112
25
SBAS085B
www.ti.com
T
INT
T
INT
t
30
T
INT
T
INT
t
31
Side A
Data
Side B
Data
CONV
DVALID
DXMIT
DCLK
DOUT
FIGURE 27. Readback in Noncontinuous Mode.
FIGURE 28. Timing Diagram at Power-Up of the DDC112.
t
32
t
33
Integrate Side A
Integrate Side B
Power-Up
Initialization
Release State
Start
Integration
CONV
(HIGH at power-up)
CONV
(LOW at power-up)
Power Supplies
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNITS
t32
Power-On Initialization Period
50
s
t33
From Release Edge to Integration Start
50
s
TABLE XI. Timing for the DDC112 Power-Up Sequence.
CLK = 10MHz
CLK = 15MHz
SYMBOL
DESCRIPTION
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
t30
1st Ncont Mode Data Ready (see SBAA024)
421.1
±0.3
280.8
s
t31
2nd Ncont Mode Data Ready (see SBAA024)
454.8
303.2
s
LAYOUT
Power Supplies and Grounding
Both AVDD and DVDD should be as quiet as possible. It is
particularly important to eliminate noise from AVDD that is
non-synchronous with the DDC112 operation. Figure 29
illustrates two acceptable ways to supply power to the
DDC112. The first case shows two separate +5V supplies for
AVDD and DVDD. In this case, each +5V supply of the
DDC112 should be bypassed with 10
F solid tantalum ca-
pacitors and 0.1
F ceramic capacitors. The second case
shows the DVDD power supply derived from the AVDD supply
with a < 10
isolation resistor. In both cases, the 0.1F
capacitors should be placed as close to the DDC112 pack-
age as possible.
Shielding Analog Signal Paths
As with any precision circuit, careful printed circuit layout will
ensure the best performance. It is essential to make short,
direct interconnections and avoid stray wiring capacitance—
particularly at the analog input pins. Digital signals should be
kept as far from the analog input signals as possible on the
PC board.
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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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