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DDC118IRTCR PDF预览

DDC118IRTCR

更新时间: 2024-10-26 21:55:11
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描述
Octal Current Input 20-Bit Analog-To-Digital Converter

DDC118IRTCR 数据手册

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DDC118  
SBAS325A − JUNE 2004 − REVISED JUNE 2005  
Octal Current Input 20-Bit  
Analog-To-Digital Converter  
FD EATURES  
AD PPLICATIONS  
SINGLE-CHIP SOLUTION TO DIRECTLY  
MEASURE EIGHT LOW-LEVEL CURRENTS  
HIGH PRECISION, TRUE INTEGRATING  
FUNCTION  
CT SCANNER DAS  
D
D
D
PHOTODIODE SENSORS  
INFRARED PYROMETER  
LIQUID/GAS CHROMATOGRAPHY  
D
D
D
D
D
D
D
INTEGRAL LINEARITY:  
Protected by US Patent #5841310  
0.01% of Reading 0.5ppm of FSR  
VERY LOW NOISE: 5.2ppm of FSR  
LOW POWER: 13.5mW/channel  
DESCRIPTION  
ADJUSTABLE DATA RATE: Up to 3.125kSPS  
PROGRAMMABLE FULL SCALE  
DAISY-CHAINABLE SERIAL INTERFACE  
The DDC118 is a 20-bit octal channel, current-input  
analog-to-digital (A/D) converter. It combines both  
current-to-voltage and A/D conversion so that eight  
low-level current output devices, such as photodiodes, can  
be directly connected to its inputs and digitized.  
AVDD  
VREF  
DVDD  
CLK  
For each of the eight inputs, the DDC118 provides a  
dual-switched integrator front-end. This design 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.  
CONV  
IN1  
IN3  
RANGE0  
RANGE1  
RANGE2  
TEST  
Dual  
Switched  
Integrator  
∆Σ  
Modulator  
Digital  
Control  
Filter  
CLK_4X  
HISPD/LOPWR  
RESET  
Dual  
Switched  
Integrator  
IN2  
IN4  
Dual  
Switched  
Integrator  
∆Σ  
Modulator  
Digital  
Filter  
FORMAT  
DCLK  
DCLK  
DVALID  
DOUT  
DOUT  
DIN  
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. High-Speed mode  
supports data rates up to 3.125kSPS with a corresponding  
dissipation of 18mW per channel.  
Dual  
Switched  
Integrator  
IN5  
IN7  
Digital  
Dual  
Switched  
Integrator  
∆Σ  
Modulator  
Digital  
Filter  
Input/Output  
The DDC118 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-DDC118  
system is minimal.  
Dual  
Switched  
Integrator  
IN6  
IN8  
Dual  
Switched  
Integrator  
DIN  
∆Σ  
Modulator  
Digital  
Filter  
The DDC118 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 DDC118 is offered in a QFN-48 package.  
Dual  
Switched  
Integrator  
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 2002−2005, Texas Instruments Incorporated  
www.ti.com  

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