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Texas Instruments DDC112YK/250G4
- Part No.:
- DDC112YK/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-TQFP
- Datasheet:
-
DDC112YK/250G4.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 32TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,333
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Product details
Overview
DDC112YK/250G4 from Texas Instruments is a dual-channel, 20-bit charge-digitizing analog-to-digital converter optimized for low-level current inputs such as photodiodes and CT sensors. It features continuous dual-switched integrator architecture, ±0.025% reading integral linearity (max), 3.2 ppm rms noise at Range 5 (250 pC), and programmable full-scale ranges from 0.2 pC to 1000 pC via internal/external capacitors. It operates from single +5 V supplies and supports cascaded serial output for multi-channel systems.
For engineers reviewing the DDC112YK/250G4 datasheet, DDC112YK/250G4 pinout, DDC112YK/250G4 application, or DDC112YK/250G4 equivalent, this page delivers verified technical context, TQFP-32 package mapping, confirmed 20-bit resolution with true integrating function, real-world noise vs. integration time behavior, and validated alternatives for precision charge measurement in medical imaging and analytical instrumentation.
Technical Context
The DDC112YK/250G4 implements two independent input channels, each with dual switched integrators (A/B) enabling continuous charge integration: while one side integrates, the other is digitized by a shared delta-sigma modulator and digital filter. Its front-end topology uses VREF-referenced reset and charge-proportional voltage decay across programmable integration capacitors - not sampled-data or SAR-based conversion.
Conversion control relies on synchronized CONV and CLK signals (15 MHz nominal for YK grade), with integration time (TINT = 333.3 µs) directly setting dynamic range and noise floor. Digital interface uses synchronous serial I/O (DCLK, DXMIT, DOUT, DIN, DVALID) supporting daisy-chained configurations of >100 units without additional logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit monotonic output with no missing codes - ensures unambiguous quantization of ultra-low charge signals down to sub-pC levels. |
| Integral Linearity Error | ±0.025% reading ±1.0 ppm FSR (max) - guarantees high-fidelity digitization across full dynamic range without correction tables. |
| Input Noise | 3.2 ppm of FSR rms (Range 5, CSENSOR = 0 pF) - enables detection of <10 fA current changes in precision spectroscopy and pyrometry. |
| Full-Scale Range | Programmable from 0.2 pC to 1000 pC via RANGE[2:0] and external capacitors - supports direct connection of diverse photosensors and ion detectors. |
| Integration Time | 333.3 µs (DDC112YK grade) - sets 3 kHz effective conversion rate and defines anti-aliasing cutoff for low-frequency sensor signals. |
| Supply Voltage | +4.75 V to +5.25 V on AVDD/DVDD - allows operation from standard 5 V rails without regulation overhead. |
| Operating Temperature | 0°C to +70°C - qualified for industrial and laboratory instrumentation environments, excluding extended automotive or military grades. |
Pinout & Package
TQFP-32 package with 0.5 mm pitch; thermally enhanced pad (exposed die attach paddle) connected to AGND per TI SBAS085B Rev. October 2004.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1, IN2 | Dual analog current inputs | Accept low-level photocurrents directly; internally referenced to AGND; support bidirectional charge flow (±0.4% FS negative range). |
| CAP1A/CAP1B, CAP2A/CAP2B | External integration capacitor terminals | Paired pins per integrator side (e.g., CAP1A pins 1–2); enable user-defined full-scale up to 1000 pC with low-leakage COG/polystyrene caps. |
| RANGE0–RANGE2 | 3-bit full-scale selection | Select one of eight internal capacitor values (12.5–87.5 pF) - determines nominal positive FS from –0.2 pC to +350 pC. |
| CONV, CLK, DCLK | Timing control inputs | CONV synchronizes integrator switching to CLK edge (±10 ns tolerance); DCLK clocks serial data retrieval independently of conversion timing. |
| DOUT, DVALID, DXMIT, DIN | Synchronous serial interface | DVALID asserts low when 20-bit result is ready; DXMIT enables shift register output; DIN accepts upstream data for cascading. |
| VREF, AGND, DGND, AVDD, DVDD | Reference and supply terminals | VREF = +4.096 V (±0.1 V) resets integrators and references ∆Σ modulator; separate analog/digital grounds prevent noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Continuous dual-integrator architecture | Enables uninterrupted current integration - eliminates dead time between conversions critical for real-time CT scanner DAS and chromatography peak capture. |
| Digital filtering with 3.2 ppm rms noise | Reduces quantization and thermal noise without external averaging; maintains 20-bit ENOB at 3 kHz output rate under optimal conditions. |
| Cascadable serial interface | Supports >100-unit daisy chains using single DCLK/DXMIT bus - reduces PCB routing complexity in multi-sensor arrays like blood analysis microfluidic platforms. |
| Single +5 V supply operation | Eliminates need for dual-rail or negative supplies - simplifies power design in portable IR pyrometers and handheld analytical instruments. |
| Internal test charge injection (13 pC) | Allows in-system calibration verification without external signal sources - confirms integrator gain stability and linearity drift over temperature. |
Applications
| CT Scanner DAS | Infrared Pyrometer |
|---|---|
Use Scenario: Digitizing scintillation detector currents in multi-slice computed tomography systems requiring simultaneous acquisition from dozens of detector elements. IC Role / Device Role / Timing Role: Dual-channel charge integrator converting picoamp-level photodiode currents into 20-bit digital values at 3 kHz per channel with continuous integration. Use Value: Eliminates dead time between slices; 3.2 ppm rms noise enables accurate Hounsfield unit calculation without post-processing averaging. |
Use Scenario: Measuring thermopile or photovoltaic detector outputs in non-contact temperature sensing for industrial furnaces and semiconductor process tools. IC Role / Device Role / Timing Role: Precision current-to-digital converter interfacing with low-output IR sensors; programmable full-scale adapts to varying optical path losses. Use Value: ±0.025% linearity ensures traceable temperature accuracy across 0–2000°C ranges; single-supply operation simplifies isolated sensor head design. |
| Liquid Chromatography Detector | Blood Analysis Instrument |
Use Scenario: Converting current pulses from UV/Vis absorbance or fluorescence detectors during high-resolution liquid chromatography separation runs. IC Role / Device Role / Timing Role: High-dynamic-range ADC capturing transient analyte peaks (sub-pC to nC) with consistent 20-bit resolution across full scale. Use Value: Programmable integration capacitors allow auto-ranging per peak height; low offset drift (<±0.5 ppm/°C) preserves baseline stability over multi-hour assays. |
Use Scenario: Quantifying electrochemical or optical signals from microfluidic blood cell counters and immunoassay cartridges. IC Role / Device Role / Timing Role: Dual-input digitizer acquiring parallel measurements from reference and sample channels to reject common-mode interference. Use Value: Matched range error (±0.1% FSR) and offset drift between channels enable ratiometric analysis without hardware trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge-digitizing ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7739BRUZ | 24-bit ΣΔ ADC, single-channel, 10 Hz–10 kHz output rate, no dual-integrator architecture; requires external op-amp for current-to-voltage conversion. | Better resolution but lower throughput; suited for static or slow-varying measurements (e.g., lab-grade balances), not real-time CT or chromatography. | Choose AD7739BRUZ only when ultimate DC precision (>1 ppm) outweighs need for continuous integration and dual-channel concurrency. |
| LTC2418CGN#PBF | 24-bit ΣΔ ADC, 8-channel multiplexed, 7 Hz output rate, integrated PGA; lacks dedicated current-input architecture and programmable integration capacitors. | Designed for general-purpose sensor digitization (thermocouples, RTDs); insufficient noise performance (<10 ppm rms) and bandwidth for photodiode CT DAS. | Choose LTC2418CGN#PBF for multi-sensor monitoring where channel count > speed, but not for low-current, high-bandwidth charge measurement. |
Compared with DDC112YK/250G4, AD7739BRUZ offers higher resolution but requires external signal conditioning and sacrifices real-time dual-channel capability, while LTC2418CGN#PBF provides more inputs at much lower speed and noise floor - making DDC112YK/250G4 uniquely suited for concurrent, low-noise, wide-dynamic-range charge digitization.
Availability
DDC112YK/250G4 is available at Aetrix Electronics and suitable for CT scanner data acquisition systems, infrared pyrometers, liquid/gas chromatography detectors, and blood analysis instrumentation requiring stable component supply with guaranteed long-term manufacturability.
Supply support for DDC112YK/250G4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data converters and sensor interface solutions.
The DDC112YK/250G4 belongs to TI's high-precision charge-digitizing ADC product line, engineered specifically for direct photodetector and ion-current digitization in medical imaging, analytical instrumentation, and industrial process control.
FAQ
What is the maximum full-scale input charge supported by the DDC112YK/250G4?
The DDC112YK/250G4 supports up to 1000 pC full-scale input charge when configured with external integration capacitors (RANGE2–RANGE0 = 000). With internal capacitors only, the maximum is 350 pC (Range 7). This wide range enables direct interfacing with diverse current-output sensors without external amplification or attenuation stages - a key advantage of the DDC112YK/250G4 in multi-sensor systems.
Does the DDC112YK/250G4 require a negative supply voltage?
No, the DDC112YK/250G4 operates from a single +5 V supply (AVDD and DVDD = +4.75 V to +5.25 V). Its architecture uses VREF-referenced integrator reset and differential ∆Σ conversion, eliminating the need for negative rails. This simplifies power design in portable and space-constrained applications such as handheld IR pyrometers and point-of-care blood analyzers using the DDC112YK/250G4.
How does the DDC112YK/250G4 achieve continuous integration across two inputs?
The DDC112YK/250G4 uses four independent switched integrators (two per channel: A and B) time-multiplexed to a single ∆Σ modulator. While Integrator 1A integrates, Integrator 1B is digitized - and vice versa - ensuring zero dead time. The same applies to Channel 2. This dual-integrator-per-channel design is fundamental to the DDC112YK/250G4's ability to support real-time CT scanner DAS and high-speed chromatography.
What is the purpose of the TEST pin on the DDC112YK/250G4?
The TEST pin on the DDC112YK/250G4 enables in-system calibration by injecting a precise 13 pC charge packet into both input integrators upon CONV edge synchronization. This allows verification of gain stability, linearity, and channel matching without external test equipment - critical for maintaining accuracy in deployed blood analysis instruments using the DDC112YK/250G4 over its operational lifetime.
Can multiple DDC112YK/250G4 devices be connected in series for synchronized readout?
Yes, the DDC112YK/250G4 supports daisy-chained serial output via DIN/DOUT pins with shared DCLK and DXMIT lines. Up to 100+ units can be cascaded while maintaining deterministic timing - reducing digital interconnect count in large-array systems like multi-detector CT scanners or high-channel-count gas chromatography systems using the DDC112YK/250G4.
DDC112YK/250G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 20
- Sampling Rate (Per Second):
- 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
- Supplier Device Package:
- 32-TQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
DDC112YK/250G4 FAQ
1.How can I place an order for DDC112YK/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDC112YK/250G4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DDC112YK/250G4 reliable?
The price and inventory of DDC112YK/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDC112YK/250G4 is usually 5 days.
3.What payment methods are accepted for DDC112YK/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDC112YK/250G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDC112YK/250G4?
DDC112YK/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDC112YK/250G4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DDC112YK/250G4?
For technical support, including DDC112YK/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDC112YK/250G4 requirements.
6.How does Aetrix verify that DDC112YK/250G4 is sourced from the original manufacturer or authorized distributors?
All DDC112YK/250G4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DDC112YK/250G4 meets industry standards.
7.What is the process for return or replacement of DDC112YK/250G4?
All DDC112YK/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with DDC112YK/250G4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DDC112YK/250G4 part is unused and in its original packaging.
Return procedure for DDC112YK/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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