Overview
The DDC112U/1K, produced by Texas Instruments, is a dual current input, 20-bit analog-to-digital (A/D) converter designed for high precision and wide dynamic range applications. This converter integrates current-to-voltage conversion, continuous integration, programmable full-scale range, A/D conversion, and digital filtering. It is particularly suited for applications requiring precise measurement of low-level currents.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 20 bits |
| Number of Channels | 2 |
| Analog Supply Voltage (AVDD) | +5V Nominal |
| Digital Supply Voltage (DVDD) | +5V Nominal |
| System Clock Frequency | 10MHz Nominal |
| Conversion Time | Approximately 220µs |
| Package Types | SO-28, TQFP-32 |
| Full-Scale Range | Programmable, up to 1000pC with external capacitors |
Key Features
- Dual current input with continuous integration and A/D conversion.
- Programmable full-scale range with external integrating capacitors.
- High-speed serial interface for data output, allowing cascading of multiple units.
- Internal delta-sigma (∆Σ) converter for high precision.
- Single-supply operation with differential input tied to VREF.
- Low noise and high accuracy due to the integration of multiple stages.
Applications
The DDC112U/1K is suitable for various applications requiring precise current measurements, such as:
- Medical imaging and diagnostics.
- Industrial process control and monitoring.
- Scientific instrumentation.
- Aerospace and defense systems.
- High-energy physics experiments.
Q & A
- What is the resolution of the DDC112U/1K A/D converter?
The DDC112U/1K has a resolution of 20 bits. - How many input channels does the DDC112U/1K have?
The DDC112U/1K has two input channels. - What is the typical system clock frequency for the DDC112U/1K?
The typical system clock frequency is 10MHz. - How long does a single conversion take?
A single conversion takes approximately 220µs. - What are the available package types for the DDC112U/1K?
The DDC112U/1K is available in SO-28 and TQFP-32 packages. - Can the full-scale range be adjusted?
Yes, the full-scale range is programmable and can be extended up to 1000pC with external integrating capacitors. - How does the DDC112U/1K handle data output?
The DDC112U/1K uses a high-speed serial interface for data output and allows cascading of multiple units. - What is the purpose of the TEST input pin?
The TEST input pin applies a test charge to the integrators on the next CONV transition when HIGH. - What is the function of the CONV input pin?
The CONV input pin controls which side of the integrator is connected to the input and must be synchronized with the CLK pin. - What is indicated by the DVALID output?
The DVALID output goes LOW when the shift register contains valid data.
