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Name: DDC112U
Brand: Texas Instruments
SKU: DDC112U
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 DDC112U

Part No.:: DDC112U

Manufacturer:: Texas Instruments

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

Datasheet:: DDC112U.pdf

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

In Stock:: 3169

Quantity:: Add To Cart

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DDC112U Specifications

Packaging:
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:
-40°C ~ 85°C

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DDC112U information

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DDC112U Typical application Circuitry

DDC112U

The DDC112U is a precision, 20-bit, analog-to-digital converter (ADC) designed by Texas Instruments, featuring dual channels and integrating a charge-balancing ADC architecture. It is specifically tailored for direct connection to a photodiode and is optimized for applications requiring high-resolution measurement of small signal inputs directly from sensor outputs. This chip is particularly suitable for scientific instrumentation, medical devices, and industrial measurement systems where accuracy, stability, and low noise are crucial.

Key Features and Specifications:

- Resolution: 20-bit high-resolution ADC, providing precise measurement capabilities.

- Channels: Dual-channel input, allowing for simultaneous measurement of two independent sources.

- Input Type: Direct photodiode input capability, with an integrated current-to-voltage conversion.

- Sampling Rate: Adjustable sampling rates to optimize performance based on application requirements.

- Power Supply: Operates from a single 5V supply, simplifying power management in system design.

- Interface: Digital serial interface, facilitating easy connection to microcontrollers or digital signal processors.

Application Scenario: A common application for the DDC112U is in a blood analysis machine within medical diagnostics, where it serves as the core component in the optical detection system, converting light intensity into digital values for further analysis.

Circuit Design Integration:

Incorporating the DDC112U into a blood analysis machine involves careful planning around its pin configuration and electrical interfaces:

1. Photodiode Connection (IN1-, IN1+, IN2-, IN2+; Pins 1, 2, 15, and 16): Connect the anodes of two photodiodes to IN1+ and IN2+, and their cathodes to IN1- and IN2-. These inputs are designed for direct photodiode connection, facilitating current-to-voltage conversion for optical signal measurement.

2. Reference Voltage (REFH, REFL; Pins 14 and 3): Establish a stable reference voltage by connecting these pins to the high and low reference voltages. This setup defines the measurement range for the ADC, critical for achieving accurate and reliable readings.

3. Digital Output Interface (DOUT/DRDY, SCLK, DIN, CS; Pins 5, 6, 7, and 8): Interface these pins with a microcontroller or DSP. DOUT/DRDY indicates data readiness and serves as the serial data output, SCLK is the serial clock input, DIN is the serial data input, and CS is the chip select, controlling access to the device's SPI interface.

4. Power Supply and Grounding (VDD, DGND, AGND; Pins 10, 11, 4): Connect VDD to a regulated 5V power supply, and ensure proper grounding by connecting DGND and AGND to the system's digital and analog ground planes, respectively. Maintaining separate ground planes for digital and analog circuits helps minimize noise.

5. Clock Input (CLK IN, CLK OUT; Pins 12 and 13): Provide a clock signal to CLK IN for the ADC's internal operations. CLK OUT can optionally be used to daisy-chain multiple ADCs or provide a clock signal to other parts of the system.

Design Considerations:

- Signal Integrity: Care must be taken to minimize noise in the signal path, especially between the photodiodes and the ADC inputs. Shielding and layout techniques should be employed to protect against electromagnetic interference.

- Photodiode Selection: Choose photodiodes with appropriate sensitivity and response time for the application's specific light detection requirements. The characteristics of the photodiode directly impact the accuracy and responsiveness of the measurement system.

- Reference Voltage Stability: The stability and accuracy of the reference voltages are vital for the ADC's performance. Using precision voltage references and incorporating decoupling capacitors close to the REFH and REFL pins can enhance measurement precision.

- Power Supply Decoupling: Implement decoupling capacitors near the VDD pin to stabilize the power supply line and reduce the impact of transient voltage spikes.

- Firmware and Data Processing: Develop firmware for the microcontroller or DSP to properly initialize the DDC112U, manage data acquisition timing, and process the digitized data. Implementing digital filtering and calibration routines in the firmware can further improve measurement accuracy and reliability.

Integrating the DDC112U into a blood analysis machine's optical detection system exemplifies its capability to accurately and reliably digitize small signal inputs, such as those from photodiodes responding to light passed through samples. This application underscores the ADC's utility in medical diagnostics, where precision and stability are paramount.

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(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 DDC112U.

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

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