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DDC232C Datasheet(PDF) 1 Page - Texas Instruments |
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DDC232C Datasheet(HTML) 1 Page - Texas Instruments |
1 / 34 page Serial Interface DVALID DCLK DOUT DIN Configuration and Control IN2 IN1 DGND AGND IN4 IN3 IN30 IN29 DS ADC IN32 IN31 CLK CONV DIN_CFG CLK_CFG RESET Dual Switched Integrator Dual Switched Integrator Dual Switched Integrator Dual Switched Integrator Dual Switched Integrator Dual Switched Integrator Dual Switched Integrator Dual Switched Integrator VREF DVDD AVDD 0.1 F m 0.1 F m 0.1 F m DS ADC DS ADC DS ADC DDC232 www.ti.com SBAS331D – AUGUST 2004 – REVISED APRIL 2010 32-Channel, Current-Input Analog-to-Digital Converter Check for Samples: DDC232 The DDC232 uses a +5V analog supply and a +2.7V 1 FEATURES to +3.6V digital supply. Operating over the 2 • Single-Chip Solution to Directly Measure 32 temperature range of 0°C to +70°C, the DDC232 Low-Level Currents BGA-64 package is offered in two versions: the • High-Precision, True Integrating Function DDC232C for low-power applications, and the DDC232CK when higher speeds are required. • Integral Linearity: ±0.025% of Reading ±1.0ppm of FSR • Very Low Noise: 5.3ppm of FSR • Low Power: 7mW/channel • Adjustable Full-Scale Range • Adjustable Speed – Data Rate up to 6kSPS – Integration Times as low as 166.5ms • Daisy-Chainable Serial Interface • In-Package Bypass Capacitors Simplify PCB Design APPLICATIONS • CT Scanner DAS • Photodiode Sensors • X-Ray Detection Systems DESCRIPTION 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. 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 166ms to 1s, allowing currents from fAs to mAs to be continuously measured with outstanding precision. Protected by US Patent #5841310 The DDC232 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-DDC232 system is minimal. 1 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. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2004–2010, 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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