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Texas Instruments VSP2254GSJ
- Part No.:
- VSP2254GSJ
- Manufacturer:
- Texas Instruments
- Category:
- Video Processing
- Package:
- 96-TFBGA
- Datasheet:
-
VSP2254GSJ.pdf
- Description:
- IC VIDEO CCD SIGNAL PROC 96BGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,064
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Product details
Overview
VSP2254GSJ from Texas Instruments is a dual-channel CCD signal processor IC integrating correlated double sampling (CDS) and a 14-bit analog-to-digital converter, operating at up to 36 MHz with 75-dB SNR and 2.7 V–3.6 V single-supply voltage, used in digital video cameras and dual-CCD front ends.
For engineers reviewing the VSP2254GSJ datasheet, VSP2254GSJ pinout, VSP2254GSJ application, or VSP2254GSJ equivalent, key selection criteria include dual-channel CDS timing alignment, 14-bit no-missing-codes ADC performance, optical black clamp loop convergence time (40.7 µs), and BGA-96 package thermal resistance (55 °C/W).
Technical Context
The VSP2254GSJ implements two independent, fully synchronized CCD processing paths sharing common SHP/SHD/ADCCK timing inputs, each featuring switched-capacitor CDS with 6.9 ns reference/data sample settling time and a pipelined 1.5-bit-per-stage 14-bit ADC architecture optimized for low-voltage operation.
Its analog subsystem includes three per-channel reference voltages (REFP = 1.75 V, REFN = 1.25 V, CM = 1.5 V), dedicated BYPP/BYPM/BYPCM decoupling networks, and a closed-loop 10-bit current DAC-based optical black clamp (COB output) with exponential convergence to 1543 LSB in 40.7 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit ADC with no missing codes-guarantees monotonic transfer function across full scale. |
| Max conversion rate | 36 MHz-supports high-frame-rate CCD sensors with pixel clocks up to 36 MSPS per channel. |
| SNR | 75 dB (grounded input)-enables >11 effective bits of dynamic range for precision imaging. |
| CDS settling time | 6.9 ns-ensures accurate sampling within tight CCD pixel timing windows. |
| Power dissipation | 210 mW typical at 3 V/36 MHz; 14 mW in power-down mode-meets portable DVC/DSC battery life targets. |
| Supply range | 2.7 V to 3.6 V single supply-compatible with Li-ion and regulated 3.3 V systems without level-shifting. |
| Channel separation | 80 dB-prevents crosstalk between A/B channels during simultaneous dual-CCD readout. |
Pinout & Package
The VSP2254GSJ uses a 96-ball MicroStar Junior™ plastic BGA (package code GSJ), 9.0 mm × 9.0 mm body, 0.8 mm ball pitch, JEDEC MO-225 compliant, with separate AGND/DGND planes and dedicated VCC/VDD supplies for analog/digital sections.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHP_A / SHP_B | CCD reference sampling pulse (active low) | Triggers CDS reference-level capture on respective channel; must be synchronized across both channels. |
| SHD_A / SHD_B | CCD data sampling pulse (active low) | Triggers CDS data-level capture; timing relative to SHP defines CDS window (t(PD) = 4 ns min). |
| CCDIN_A / CCDIN_B | Analog CCD signal input | AC-coupled input (1 Vp-p range); requires external emitter-follower buffer driving ≤10 pF + stray capacitance. |
| B[13:0]_A / B[13:0]_B | Digital ADC output (14-bit straight binary) | Two independent 14-bit parallel outputs synchronized to ADCCK rising edge with fixed 8-clock latency. |
| CLPOB | Optical black clamp pulse (active low) | Enables auto-zero loop for both channels simultaneously using OB pixels; sets COB voltage to establish black level. |
| STB | Standby control (active high) | Puts entire device into 14 mW power-down; requires 200–300 ms recovery before valid output resumption. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel CDS with shared timing | Enables synchronous dual-CCD readout using single SHP/SHD source-reduces system timing complexity and board space. |
| 14-bit no-missing-codes ADC | Guarantees monotonicity and linearity (DNL ±2 LSB, INL ±8 LSB)-critical for color fidelity and gradient reproduction. |
| Optical black clamp loop with 10-bit DAC | Automatically calibrates black level offset from OB pixels with 40.7 µs exponential convergence-eliminates manual calibration and drift compensation. |
| Independent per-channel voltage references | REFP (1.75 V), REFN (1.25 V), CM (1.5 V) buffered and decoupled-ensures stable 1 V full-scale ADC range and noise immunity. |
| Separate analog/digital supplies & grounds | VCC (analog), VDD (digital outputs), AGND/DGND pins physically isolated-minimizes digital switching noise coupling into analog signal path. |
Applications
| Digital Video Camera (DVC) | Digital Still Camera (DSC) |
|---|---|
Use Scenario: High-resolution interlaced or progressive-scan video capture with dual-CCD architecture for improved color separation and low-light sensitivity. IC Role / Device Role / Timing Role: Front-end signal processor performing correlated double sampling, black-level clamping, and 14-bit digitization of two independent CCD outputs. Use Value: 75-dB SNR and 80-dB channel separation preserve image fidelity during simultaneous dual-channel readout under varying lighting conditions. | Use Scenario: Single-shot high-resolution still image capture using dual-CCD sensor array with real-time black-level calibration. IC Role / Device Role / Timing Role: Dual-channel analog front-end providing synchronized CDS, optical black clamp, and 14-bit ADC conversion with fixed 8-clock latency. Use Value: 10-bit DAC-based OBC loop converges in 40.7 µs to eliminate sensor-specific black-level drift-enabling consistent exposure accuracy across temperature and aging. |
| Dual-Channel CCD Front End | Professional Broadcast Imaging System |
Use Scenario: Industrial machine vision system requiring precise synchronization of two spatially separated CCD sensors for stereo or multi-spectral analysis. IC Role / Device Role / Timing Role: Synchronized dual-path signal conditioner with shared SHP/SHD/ADCCK inputs and independent B[13:0] outputs. Use Value: 6.9 ns CDS settling time and matched per-channel reference networks ensure sub-pixel timing alignment and <1 LSB gain/offset mismatch between channels. | Use Scenario: High-end broadcast camera head with dual-CCD sensor array demanding low-noise, high-SNR digitization and robust thermal stability. IC Role / Device Role / Timing Role: Precision mixed-signal processor handling CCD signal conditioning, black-level correction, and 14-bit digitization across extended industrial temperature range (–25°C to 85°C). Use Value: 55 °C/W θJA and BGA-96 package enable stable thermal performance in compact, fanless enclosures without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel CCD signal processing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9845BASTZ | Single-channel 14-bit ADC with integrated CDS; no optical black clamp loop; 48-LQFP package. | Requires external black-level calibration circuitry; not suitable for dual-CCD architectures without duplication. | Select when only one CCD channel is needed and board space permits discrete OBC implementation. |
| TDC1000YFFT | Ultrasonic AFE with 12-bit SAR ADC; no CDS; no CCD-specific timing or clamping functions. | Designed for time-of-flight sensing-not compatible with CCD timing, voltage ranges, or signal chain requirements. | Not a functional alternative; avoid for CCD applications due to missing CDS, SHP/SHD interface, and black-level support. |
Compared with AD9845BASTZ and TDC1000YFFT, the VSP2254GSJ uniquely integrates dual-channel CDS, 14-bit no-missing-codes ADC, and auto-calibrating optical black clamp in a single BGA package-enabling compact, low-power dual-CCD designs without external timing or calibration components.
Availability
VSP2254GSJ is available at Aetrix Electronics and suitable for digital video cameras, digital still cameras, and dual-channel CCD front ends requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for VSP2254GSJ 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 company specializing in analog, embedded processing, and digital signal solutions for industrial, automotive, and consumer markets.
The VSP2254GSJ belongs to TI's Vision Signal Processing product line, designed specifically for high-fidelity CCD and CMOS image sensor signal conditioning in portable and professional imaging equipment.
FAQ
What is the maximum supported pixel clock frequency for the VSP2254GSJ?
The VSP2254GSJ supports a maximum conversion rate of 36 MHz, corresponding to a pixel clock frequency of 36 MSPS per channel. This is validated under recommended operating conditions (VCC = 3 V, TA = 25°C) and enables high-frame-rate operation in digital video cameras and dual-CCD systems. The VSP2254GSJ maintains 75-dB SNR and 14-bit linearity up to this rate.
Does the VSP2254GSJ require external clock generation for SHP/SHD timing?
No, the VSP2254GSJ does not generate SHP/SHD internally-it requires externally supplied, precisely timed SHP and SHD pulses (active low) synchronized to the CCD sensor's output waveform. These signals drive the CDS sampling windows and must meet t(PD) ≥ 4 ns and t(DP) ≥ 6.9 ns timing relationships. The VSP2254GSJ itself contains no on-chip timing generator for SHP/SHD.
How does the optical black clamp loop in the VSP2254GSJ achieve automatic black-level calibration?
The VSP2254GSJ uses an on-chip 10-bit current DAC to adjust the COB pin voltage during CLPOB activation, closing a feedback loop that drives the ADC output code toward zero for optical black pixels. With a 0.1-µF external capacitor at COB, the loop converges exponentially to 1543 LSB in 40.7 µs (typ), eliminating sensor and IC offset drift without external calibration hardware.
What is the purpose of separate VCC and VDD supply pins on the VSP2254GSJ?
VCC powers the analog signal path (CDS, ADC, references), while VDD supplies only the digital output drivers (B[13:0]). This separation prevents digital switching noise from degrading analog performance. TI recommends routing VDD through a ferrite bead and decoupling it near DGND-ensuring clean 14-bit output integrity even under heavy bus loading.
Can the VSP2254GSJ operate outside the specified –25°C to 85°C temperature range?
The VSP2254GSJ is characterized and guaranteed for operation from –25°C to 85°C. While absolute maximum ratings allow ambient bias up to 125°C, electrical specifications-including SNR, INL/DNL, and CDS settling-are not assured beyond the rated range. For reliable 75-dB SNR and 14-bit linearity, operation must remain within –25°C to 85°C as defined in the VSP2254GSJ datasheet.
VSP2254GSJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 96-TFBGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Function:
- Processor
- Applications:
- Consumer Video
- Standards:
- -
- Control Interface:
- Analog Voltage
- Voltage - Supply:
- 2.7V ~ 3.6V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 96-PBGA MICROSTAR JUNIOR (9x9)
VSP2254GSJ FAQ
1.How can I place an order for VSP2254GSJ through Aetrix?
Please submit a Request for Quotation (RFQ) for VSP2254GSJ 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 VSP2254GSJ reliable?
The price and inventory of VSP2254GSJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VSP2254GSJ is usually 5 days.
3.What payment methods are accepted for VSP2254GSJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VSP2254GSJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VSP2254GSJ?
VSP2254GSJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VSP2254GSJ 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 VSP2254GSJ?
For technical support, including VSP2254GSJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VSP2254GSJ requirements.
6.How does Aetrix verify that VSP2254GSJ is sourced from the original manufacturer or authorized distributors?
All VSP2254GSJ 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 VSP2254GSJ meets industry standards.
7.What is the process for return or replacement of VSP2254GSJ?
All VSP2254GSJ units undergo pre-shipment inspection (PSI). If there is an issue with VSP2254GSJ, 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 VSP2254GSJ part is unused and in its original packaging.
Return procedure for VSP2254GSJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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