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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： | 33/34页 |
| 文件大小： | 776K |
| 代理商： | DDC112U/1K |
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DDC112
8
SBAS085B
www.ti.com
THEORY OF OPERATION
The basic operation of the DDC112 is illustrated in Figure 1.
The device contains two identical input channels where each
performs the function of current-to-voltage integration fol-
lowed by a multiplexed analog-to-digital (A/D) conversion.
Each input has two integrators so that the current-to-voltage
integration can be continuous in time. The output of the four
integrators are switched to one delta-sigma (
Σ) converter
via a four input multiplexer. With the DDC112 in the continu-
ous integration mode, the output of the integrators from one
side of both of the inputs will be digitized while the other two
integrators are in the integration mode as illustrated in the
timing diagram in Figure 2. This integration and A/D conver-
sion process is controlled by the system clock, CLK. With a
10MHz system clock, the integrator combined with the delta-
sigma converter accomplishes a single 20-bit conversion in
approximately 220
s. The results from side A and side B of
each signal input are stored in a serial output shift register.
The DVALID output goes LOW when the shift register
contains valid data.
The digital interface of the DDC112 provides the digital
results via a synchronous serial interface consisting of a data
clock (DCLK), a transmit enable pin (DXMIT), a valid data pin
(DVALID), a serial data output pin (DOUT), and a serial data
input pin (DIN). The DDC112 contains only one A/D con-
verter, so the conversion process is interleaved between the
two inputs, as shown in Figure 2. The integration and
conversion process is fundamentally independent of the data
retrieval process. Consequently, the CLK frequency and
DCLK frequencies need not be the same. DIN is only used
when multiple converters are cascaded and should be tied to
DGND otherwise. Depending on TINT, CLK, and DCLK, it is
possible to daisy-chain over 100 converters. This greatly
simplifies the interconnection and routing of the digital out-
puts in cases where a large number of converters are
needed.
Dual
Switched
Integrator
Dual
Switched
Integrator
Σ
Modulator
Digital
Filter
Control
Digital
Input/Output
DVALID
DXMIT
DOUT
DIN
DCLK
RANGE2
RANGE1
RANGE0
TEST
CONV
CLK
CAP1A
CAP1B
CAP2A
CAP2B
IN2
IN1
V
REF
DGND
DV
DD
AGND
AV
DD
Input 1
Input 2
IN1, Integrator A
IN1, Integrator B
IN2, Integrator A
IN2, Integrator B
Conversion in Progress
DVALID
IN1B
IN2B
IN1A
Integrate
IN2A
IN1B
IN2B
IN1A
IN2A
FIGURE 2. Basic Integration and Conversion Timing for the DDC112 (continuous mode).
FIGURE 1. Block Diagram.
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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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