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DDC114 PDF预览

DDC114

更新时间: 2024-10-27 22:29:27
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30页 386K
描述
Quad Current Input 20-Bit ANALOG-TO-DIGITAL CONVERTER

DDC114 数据手册

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DDC114  
SBAS255A − JUNE 2004 − REVISED NOVEMBER 2004  
Quad Current Input 20-Bit  
ANALOG-TO-DIGITAL CONVERTER  
FD EATURES  
DESCRIPTION  
SINGLE-CHIP SOLUTION TO DIRECTLY  
MEASURE FOUR LOW-LEVEL CURRENTS  
HIGH PRECISION, TRUE INTEGRATING  
FUNCTION  
The DDC114 is a 20-bit quad channel, current-input  
analog-to-digital (A/D) converter. It combines both  
current-to-voltage and A/D conversion so that four  
low-level current output devices, such as photodiodes, can  
be directly connected to its inputs and digitized.  
D
D
D
D
D
D
D
INTEGRAL LINEARITY:  
0.01% of Reading 0.5ppm of FSR  
VERY LOW NOISE: 5.2ppm of FSR  
LOW POWER: 13.5mW/channel  
ADJUSTABLE DATA RATE: Up to 3.125kSPS  
PROGRAMMABLE FULL SCALE  
DAISY-CHAINABLE SERIAL INTERFACE  
For each of the four inputs, the DDC114 provides a  
dual-switched integrator front-end. This allows for  
continuous current integration: while one integrator is  
being digitized by the onboard A/D converter, the other is  
integrating the input current. Adjustable full-scale ranges  
from 12pC to 350pC and adjustable integration times from  
50µs to 1s allow currents from fAs to µAs to be measured  
with outstanding precision. Low-level linearity is 0.5ppm  
of the full-scale range and noise is 5.2ppm of the full-scale  
range.  
AD PPLICATIONS  
CT SCANNER DAS  
D
D
D
PHOTODIODE SENSORS  
INFRARED PYROMETER  
LIQUID/GAS CHROMATOGRAPHY  
Two modes of operation are provided. In Low-Power  
mode, total power dissipation is only 13.5mW per channel  
with a maximum data rate of 2.5kSPS. The High-Speed  
mode supports data rates up to 3.125kSPS with a  
corresponding dissipation of 18mW per channel.  
Protected by US Patent #5841310  
AVDD  
VREF  
DVDD  
The DDC114 has a serial interface designed for  
daisy-chaining in multi-device systems. Simply connect  
the output of one device to the input of the next to create  
the chain. Common clocking feeds all the devices in the  
chain so that the digital overhead in a multi-DDC114  
system is minimal.  
CLK  
CONV  
IN1  
IN3  
RANGE0  
RANGE1  
RANGE2  
TEST  
Dual  
Switched  
Integrator  
∆Σ  
Modulator  
Digital  
Control  
Filter  
CLK_4X  
HISPD/LOPWR  
RESET  
The DDC114 is a single-supply device using a +5V analog  
supply and supporting a +2.7V to +5.25V digital supply.  
Operating over the industrial temperature range of −40°C  
to 85°C, the DDC114 is offered in a QFN-48 package.  
Dual  
Switched  
Integrator  
FORMAT  
DCLK  
DCLK  
DVALID  
DOUT  
DOUT  
DIN  
IN2  
IN4  
Dual  
Switched  
Integrator  
∆Σ  
Modulator  
Digital  
Filter  
Digital  
Input/Output  
Dual  
Switched  
Integrator  
DIN  
AGND  
DGND  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments  
semiconductor products and disclaimers thereto appears at the end of this data sheet.  
All trademarks are the property of their respective owners.  
ꢀꢁ ꢂ ꢃꢄ ꢅ ꢆꢇ ꢂꢈ ꢃ ꢉꢆꢉ ꢊꢋ ꢌꢍ ꢎ ꢏꢐ ꢑꢊꢍꢋ ꢊꢒ ꢓꢔ ꢎ ꢎ ꢕꢋꢑ ꢐꢒ ꢍꢌ ꢖꢔꢗ ꢘꢊꢓ ꢐꢑꢊ ꢍꢋ ꢙꢐ ꢑꢕꢚ ꢀꢎ ꢍꢙꢔ ꢓꢑꢒ  
ꢓ ꢍꢋ ꢌꢍꢎ ꢏ ꢑꢍ ꢒ ꢖꢕ ꢓ ꢊ ꢌꢊ ꢓ ꢐ ꢑꢊ ꢍꢋꢒ ꢖ ꢕꢎ ꢑꢛꢕ ꢑꢕ ꢎ ꢏꢒ ꢍꢌ ꢆꢕꢜ ꢐꢒ ꢇꢋꢒ ꢑꢎ ꢔꢏ ꢕꢋꢑ ꢒ ꢒꢑ ꢐꢋꢙ ꢐꢎ ꢙ ꢝ ꢐꢎ ꢎ ꢐ ꢋꢑꢞꢚ  
ꢀꢎ ꢍ ꢙꢔꢓ ꢑ ꢊꢍ ꢋ ꢖꢎ ꢍ ꢓ ꢕ ꢒ ꢒ ꢊꢋ ꢟ ꢙꢍ ꢕ ꢒ ꢋꢍꢑ ꢋꢕ ꢓꢕ ꢒꢒ ꢐꢎ ꢊꢘ ꢞ ꢊꢋꢓ ꢘꢔꢙ ꢕ ꢑꢕ ꢒꢑꢊ ꢋꢟ ꢍꢌ ꢐꢘ ꢘ ꢖꢐ ꢎ ꢐꢏ ꢕꢑꢕ ꢎ ꢒꢚ  
Copyright 2004, Texas Instruments Incorporated  
www.ti.com  

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