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Name: DDC112UK
Brand: Texas Instruments
SKU: DDC112UK
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Any Feature, including a modified Existing Feature, that is not an Existing Feature.

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Texas Instruments DDC112UK

Part No.:: DDC112UK

Manufacturer:: Texas Instruments

Package:: 28-SOIC (0.295, 7.50mm Width)

Datasheet:: DDC112UK.pdf

Description:: IC ADC 20BIT SIGMA-DELTA 28SOIC

In Stock:: 4389

Quantity:: Add To Cart

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DDC112UK Specifications

Packaging:
Bulk,Tube
Series:
-
Product Status:
Active
Number of Bits:
20
Sampling Rate(PerSecond):
3k
Number of Inputs:
2
Input Type:
Single Ended
Data Interface:
SPI
Configuration:
DSI-ADC
Ratio-S/H:ADC:
2:1
Number of A/D Converters:
1
Architecture:
Sigma-Delta
Reference Type:
External
Voltage-Supply Analog:
5V
Voltage-Supply Digital:
5V
Features:
Simultaneous Sampling
Operating Temperature:
0°C ~ 70°C

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DDC112UK information

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DDC112UK Typical application Circuitry

DDC112UK

The DDC112UK is a high-precision, 20-bit, analog-to-digital converter (ADC) with dual channels, designed by Texas Instruments. This chip is particularly engineered for direct interfacing with photodiodes, making it an ideal component for applications requiring accurate and noise-free conversion of low-level current signals into digital data. Its primary use cases include scientific instruments, medical diagnostics equipment, and any system requiring precise light measurement, such as spectrophotometers and optical power meters.

Key Features and Specifications:

- Dual-Channel: Facilitates simultaneous measurements from two independent sources.

- High Resolution: 20-bit resolution ensures high accuracy in signal conversion.

- Direct Photodiode Interface: Optimized for connection to photodiodes, simplifying circuit design for optical measurements.

- Integrated Current-to-Voltage Conversion: Eliminates the need for external circuitry to convert photodiode current to a measurable voltage.

- Low Noise Performance: Features design optimizations that minimize measurement noise, crucial for sensitive applications.

Application Scenario: The DDC112UK is perfectly suited for a laboratory spectrophotometer used for detailed analysis of chemical substances. In this setup, it measures the intensity of light passing through a sample at various wavelengths to determine the sample's absorbance characteristics.

Circuit Design Integration:

Integrating the DDC112UK into a spectrophotometer system involves careful consideration of its pinout for optimal functionality and performance:

1. Photodiode Inputs (IN1A, IN1B, IN2A, IN2B; assume specific pins for these functions): Connect the photodiodes directly to these inputs. IN1A and IN1B for one channel, and IN2A and IN2B for the other, allowing for differential measurement that increases accuracy by canceling common-mode noise.

2. Reference Voltage (VREF; assume a designated pin for reference voltage): A stable reference voltage is critical for accurate ADC conversion. Connect this pin to a high-precision voltage reference tailored to the desired input range of the photodiodes.

3. Digital Interface (SDO, SCLK, SDI, CS; specific pins for serial communication): Utilize these pins to establish communication with a microcontroller or DSP. Implement SPI protocol for robust data transfer, with CS for chip select, SCLK for the serial clock, SDI for serial data input, and SDO for serial data output.

4. Power Supply (VDD, GND; assume standard pins for power and ground): Supply the DDC112UK with a clean and stable 5V power source. Implement rigorous decoupling techniques using capacitors close to these pins to minimize power supply noise, which is critical for maintaining the ADC's high-precision performance.

5. Clock Input (CLK; a specific pin for the external clock source): Provide a stable clock signal to this pin, which is necessary for timing the ADC conversions. The quality of the clock signal can directly influence the accuracy and noise level of the measurements.

Design Considerations:

- Photodiode Selection: Choose photodiodes with appropriate spectral response for the application. Consider factors like sensitivity, dark current, and capacitance, which can affect the overall accuracy and speed of the system.

- Signal Integrity: Employ careful routing, shielding, and grounding practices to preserve signal integrity from the photodiodes to the ADC inputs. Minimizing interference and noise pickup is crucial in high-precision measurement applications.

- Thermal Management: While the DDC112UK is designed for efficient operation, managing the thermal environment is essential, especially in compact or enclosed systems, to ensure stable operation over time.

- Firmware and Data Processing: Develop sophisticated firmware for the microcontroller or DSP to correctly initialize the ADC, manage data acquisition, and process the received digital signals. Calibration routines and error correction algorithms may be necessary to achieve the desired accuracy and repeatability.

- System Integration: Ensure that the optical components, including light sources and sample holders, are correctly aligned and optimized for use with the DDC112UK. This integration is crucial for achieving reliable and accurate measurements in a spectrophotometer system.

Incorporating the DDC112UK into a laboratory spectrophotometer exemplifies how this ADC can be effectively used to translate optical signals into precise digital data, facilitating detailed chemical analysis through absorbance measurements. This scenario highlights the chip's critical role in enabling sophisticated analytical instruments where accuracy and reliability are paramount.

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6. What is the process for return or replacement of DDC112UK?

All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the DDC112UK we delivered, we will accept the replacement or return of the DDC112UK only when all of the below conditions are fulfilled:

(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.

(2)We are informed of the defect described above within 90 days after the delivery of DDC112UK.

(3)The PartNo is unused and only in the original unpacked packaging.

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(1)Inform us within 90 days

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