Overview
The DDC118IRTCT is a 20-bit octal channel, current-input analog-to-digital (A/D) converter produced by Texas Instruments. This device combines both current-to-voltage and A/D conversion, allowing eight low-level current output devices, such as photodiodes, to be directly connected and digitized. It features a dual-switched integrator front-end for continuous current integration and supports adjustable full-scale ranges and integration times, enabling precise measurement of currents from femtoamperes to microamperes.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Bits | 20 |
| Number of Channels | 8 |
| Package Type | 48-VFQFN Exposed Pad |
| Pin Count | 48 |
| Operating Temperature Range (°C) | -40 to 85 |
| Analog Supply Voltage | +5V |
| Digital Supply Voltage | +2.7V to +5.25V |
| Maximum Data Rate | Up to 3.125 kSPS |
| Power Dissipation per Channel (Low-Power Mode) | 13.5 mW |
| Power Dissipation per Channel (High-Speed Mode) | 18 mW |
| Integral Linearity | ±0.01% of Reading ±0.5 ppm of FSR |
| Noise | 5.2 ppm of FSR |
| Full-Scale Range | 12 pC to 350 pC |
| Integration Time | 50 µs to 1 s |
Key Features
- SINGLE-CHIP SOLUTION TO DIRECTLY MEASURE EIGHT LOW-LEVEL CURRENTS
- HIGH PRECISION, TRUE INTEGRATING FUNCTION
- VERY LOW NOISE: 5.2 ppm of FSR
- LOW POWER: 13.5 mW/channel in Low-Power mode
- ADJUSTABLE DATA RATE: Up to 3.125 kSPS
- PROGRAMMABLE FULL SCALE
- DAISY-CHAINABLE SERIAL INTERFACE
Applications
- CT Scanner DAS
- Photodiode Sensors
- Infrared Pyrometer
- Liquid/Gas Chromatography
Q & A
- What is the DDC118IRTCT? The DDC118IRTCT is a 20-bit octal channel, current-input analog-to-digital (A/D) converter.
- How many channels does the DDC118IRTCT have? It has 8 channels.
- What is the package type of the DDC118IRTCT? It is available in a 48-VFQFN Exposed Pad package.
- What is the operating temperature range of the DDC118IRTCT? The operating temperature range is -40°C to 85°C.
- What are the supply voltage requirements for the DDC118IRTCT? It requires a +5V analog supply and supports a +2.7V to +5.25V digital supply.
- What is the maximum data rate of the DDC118IRTCT? The maximum data rate is up to 3.125 kSPS.
- How much power does the DDC118IRTCT dissipate per channel in Low-Power mode? It dissipates 13.5 mW per channel in Low-Power mode.
- What is the integral linearity of the DDC118IRTCT? The integral linearity is ±0.01% of Reading ±0.5 ppm of FSR.
- What are the typical applications of the DDC118IRTCT? Typical applications include CT Scanner DAS, Photodiode Sensors, Infrared Pyrometer, and Liquid/Gas Chromatography.
- Can the DDC118IRTCT be daisy-chained? Yes, it has a daisy-chainable serial interface designed for multi-device systems.
