DDC118 - 八路电流输入 20 位模数转换器

DDC118是TI德州仪器公司的一款电流输入ADC产品，DDC118是八路电流输入 20 位模数转换器，本站介绍了DDC118的封装应用图解、特点和优点、功能等，并给出了与DDC118相关的TI元器件型号供参考。

DDC118 - 八路电流输入 20 位模数转换器 - 电流输入ADC - 模数转换器 - 德州仪器

产品描述

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.

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.

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.

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.

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.

产品特性

SINGLE-CHIP SOLUTION TO DIRECTLY MEASURE EIGHT LOW-LEVEL CURRENTS
HIGH PRECISION, TRUE INTEGRATING FUNCTION
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
APPLICATIONS
- CT SCANNER DAS
- PHOTODIODE SENSORS
- INFRARED PYROMETER
- LIQUID/GAS CHROMATOGRAPHY

Protected by US Patent #5841310 All trademarks are the property of their respective owners.

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