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參數(shù)資料
| 型號： | DDC112U |
| 英文描述： | Dual Current Input 20-Bit ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 雙路電流輸入20位模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大?。?/td> | 210K |
| 代理商： | DDC112U |
6
DDC112
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 converter via a
four input multiplexer. With the DDC112 in the continuous
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 con-
version 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 con-
version in approximately 220
μ
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
converter, 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 T
INT
, CLK, and DCLK, it
is possible to daisy chain over 100 converters. This greatly
simplifies the interconnection and routing of the digital
outputs in those 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
CAP1A
CAP1B
CAP1B
CAP2A
CAP2A
CAP2B
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
Integrate
Integrate
Integrate
Integrate
Integrate
Integrate
Integrate
IN2A
IN1B
IN2B
IN1A
IN2A
FIGURE 2. Basic Integration and Conversion Timing for the DDC112 (continuous mode).
FIGURE 1. DDC112 Block Diagram.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DDC112U | 制造商:Texas Instruments 功能描述:20BIT ADC DUAL 3KHZ SOIC28 112 制造商:Texas Instruments 功能描述:20BIT ADC, DUAL, 3KHZ, SOIC28, 112 制造商:Texas Instruments 功能描述:20BIT ADC, DUAL, 3KHZ, SOIC28, 112; Resolution (Bits):20bit; Sampling Rate:3kSPS; Supply Voltage Type:Single; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; Supply Current:14.8mA; Digital IC Case Style:SOIC; No. of Pins:28; ;RoHS Compliant: Yes |
| DDC112U | 制造商:Texas Instruments 功能描述:20BIT ADC DUAL SMD SOIC28 112 |
| DDC112U | 制造商:Texas Instruments 功能描述:DUAL CURRENT INPUT 20 BIT ANALOG/DIGITAL |
| DDC112U/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 輸入類型:Differential 信噪比:107 dB 接口類型: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 |
| DDC112U/1KG4 | 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 輸入類型:Differential 信噪比:107 dB 接口類型: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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