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DDC232

更新时间： 2024-11-14 03:29:07
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28页 304K
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32-Channel, Current-Input Analog-to-Digital Converter

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DDC232  
SBAS331C–AUGUST 2004–REVISED SEPTEMBER 2006  
32-Channel, Current-Input  
Analog-to-Digital Converter  
The DDC232 has a serial interface designed for  
FEATURES  
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-DDC232 system is minimal.  
•
•
•
SINGLE-CHIP SOLUTION TO DIRECTLY  
MEASURE 32 LOW-LEVEL CURRENTS  
HIGH-PRECISION, TRUE INTEGRATING  
FUNCTION  
INTEGRAL LINEARITY:  
The DDC232 uses a +5V analog supply and a +2.7V  
to +3.6V digital supply. Operating over the  
temperature range of 0°C to +70°C, the DDC232 is  
offered in a BGA-64 package.  
±0.025% of Reading ±1.0ppm of FSR  
•
•
•
•
VERY LOW NOISE: 5.3ppm of FSR  
LOW POWER: 7mW/channel  
ADJUSTABLE FULL-SCALE RANGE  
ADJUSTABLE DATA RATE: Up to 6kSPS  
– Integration Times Down to 166.5µs  
DAISY-CHAINABLE SERIAL INTERFACE  
AVDD  
VREF  
DVDD  
CLK  
Dual  
Switched  
Integrator  
IN1  
IN2  
•
CONV  
∆Σ  
Modulator  
Digital  
Filter  
Configuration  
and  
Control  
DIN_CFG  
CLK_CFG  
RESET  
APPLICATIONS  
Dual  
Switched  
Integrator  
•
•
•
CT SCANNER DAS  
PHOTODIODE SENSORS  
X-RAY DETECTION SYSTEMS  
Protected by US Patent #5841310  
Dual  
Switched  
Integrator  
IN3  
IN4  
∆Σ  
Modulator  
Digital  
Filter  
DESCRIPTION  
DVALID  
DCLK  
DOUT  
DIN  
Dual  
Switched  
Integrator  
The DDC232 is a 20-bit, 32-channel, current-input  
analog-to-digital (A/D) converter. It combines both  
current-to-voltage and A/D conversion so that 32  
separate low-level current output devices, such as  
photodiodes, can be directly connected to its inputs  
and digitized.  
Dual  
Switched  
Integrator  
IN29  
IN30  
Serial  
Interface  
∆Σ  
Modulator  
Digital  
Filter  
Dual  
Switched  
Integrator  
For each of the 32 inputs, the DDC232 provides a  
dual-switched integrator front-end. This configuration  
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 integration times range from 166µs to 1s,  
allowing currents from fAs to µAs to be continuously  
measured with outstanding precision.  
Dual  
Switched  
Integrator  
IN31  
IN32  
∆Σ  
Modulator  
Digital  
Filter  
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.  
PRODUCTION DATA information is current as of publication date.  
Copyright © 2004–2006, Texas Instruments Incorporated  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
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