Texas Instruments VSP2264GSJ

Overview

VSP2264GSJ from Texas Instruments is a mixed-signal CCD signal processor IC integrating a timing generator, 14-bit ADC, correlated double sampler (CDS), and digital programmable-gain amplifier (PGA). It delivers –6 dB to 42 dB gain control, 79 dB SNR, and supports up to 25-MHz conversion rate for high-resolution digital still camera (DSC) image acquisition systems using Panasonic MN39594 or compatible CCD sensors.

For engineers reviewing the VSP2264GSJ datasheet, VSP2264GSJ pinout, VSP2264GSJ application, or VSP2264GSJ equivalent, key selection criteria include vertical/horizontal timing programmability (0.6 ns fine phase step), black-level clamping accuracy, CDS offset adjustment, and low-power operation modes (6 mW MCLK-off, 39 mW standby+power-save).

Technical Context

The VSP2264GSJ integrates a dual-domain timing generator supporting both pixel-rate (H-rate) and line-rate (V-rate) timing synthesis for CCD sensors. Its H-rate block generates six high-speed pulses (R, H1, HL/H2, SHP, SHD, ADCCK) with 16-step phase adjustment (0.6 ns minimum step); V-rate generation uses 11-bit line and 13-bit pixel counters enabling up to 2047 lines × 4095 pixels per frame.

The analog front end includes a switched-capacitor CDS with external coupling (0.1 µF CIN), input clamp referenced to CM = 1.5 V, 14-bit pipelined ADC with full-scale linearity, and a digital PGA with linear-in-dB gain curve. Black-level clamping uses an internal 10-bit DAC and optical black (OB) level sampling via COB terminal.

Key Specifications

Pinout & Package

Package: 96-ball BGA (GSJ package code), 0.8 mm pitch, 10 mm × 10 mm body size, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CCD signal processing applications.

Compared with TDA9981 and AD9826, the VSP2264GSJ uniquely integrates timing generation, CDS, 14-bit ADC, and digital PGA in one BGA package - reducing component count, layout complexity, and timing skew while delivering optimized SNR and power efficiency for CCD-based DSC designs.

Availability

VSP2264GSJ is available at Aetrix Electronics and suitable for digital still camera modules, industrial machine vision systems, medical endoscopy equipment, and security surveillance devices requiring stable component supply and long-term manufacturability.

Supply support for VSP2264GSJ 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, embedded processing, and silicon innovation for industrial, automotive, and consumer markets.

The VSP2264GSJ belongs to TI's Mixed Signal Products line, designed specifically for high-fidelity CCD signal acquisition in digital still cameras - emphasizing timing precision, noise reduction, and low-power operation in compact form factors.

FAQ

What is the primary function of the VSP2264GSJ in a digital still camera system?

The VSP2264GSJ serves as the complete analog front end and timing controller for CCD image sensors. It performs correlated double sampling (CDS), 14-bit analog-to-digital conversion, digital programmable gain amplification (–6 dB to 42 dB), black-level clamping, and generates all required CCD timing signals (H-rate and V-rate). In a digital still camera system, the VSP2264GSJ directly interfaces with the CCD output and synchronizes pixel readout, enabling high-SNR image capture. The VSP2264GSJ is optimized for use with the Panasonic MN39594 sensor but supports configurable timing for other CCDs.

Does the VSP2264GSJ support external clock sources for SHP and SHD signals?

Yes, the VSP2264GSJ supports both internal generation and external supply modes for SHP, SHD, ADCCK, CPOB, CLPOB, and PBLK signals. When configured for external mode via serial register settings, the device disables its internal timing generators for those signals and accepts them directly on corresponding input pins (TPP and TPD). This flexibility allows system designers to use external FPGAs or timing controllers for custom sequencing while retaining VSP2264GSJ's CDS, ADC, and PGA functionality. The VSP2264GSJ maintains full register configurability regardless of clock source mode.

What is the recommended bypass capacitor value for the CM pin on the VSP2264GSJ?

The CM (common-mode voltage) pin on the VSP2264GSJ must be bypassed to ground with a 0.1 µF ceramic capacitor, as specified in Section 2.13 (Voltage Reference) and Terminal Functions table of the SLES059 datasheet. This capacitor stabilizes the internal 1.5 V common-mode reference used by the CDS and input clamp circuits. Using the correct value ensures accurate DC bias restoration after AC coupling and prevents gain-dependent baseline shifts. Deviations from 0.1 µF may degrade CDS performance or introduce fixed-pattern noise. The VSP2264GSJ datasheet explicitly recommends this value and does not allow substitution with higher or lower capacitance without validation.

How does the black-level clamping loop operate during PGA gain changes on the VSP2264GSJ?

The VSP2264GSJ black-level clamping loop uses an internal 10-bit DAC and optical black (OB) sampling path referenced to the COB pin to maintain stable black-level accuracy during PGA gain transitions. When gain changes occur, the loop rapidly re-establishes the correct clamping voltage by sampling OB pixels and adjusting the DAC output - minimizing settling time and preventing brightness jumps in captured images. This behavior is confirmed in Section 1.1 (Description) and Section 2.9 (Black-Level Clamp Loop) of the SLES059 datasheet. The VSP2264GSJ achieves fast recovery without external intervention, making it suitable for auto-exposure algorithms requiring frequent gain updates.

What are the power-saving modes supported by the VSP2264GSJ and their typical current draw?

The VSP2264GSJ supports three defined low-power states: Standby + Power-Save Mode draws 39 mW (13 mA at 3.0 V), MCLK-Off Mode draws 6 mW (2 mA at 3.0 V), and full Active Mode consumes 130 mW (43 mA at 3.0 V) at 20 MHz. These values are measured under TA = 25°C, 3.0 V supply, and are specified in Section 1.2 (Features) and Section 5.2 (Electrical Characteristics) of the SLES059 datasheet. The VSP2264GSJ enters these modes via serial register control - no hardware pin toggling is required. Each mode retains register contents and allows fast resumption of imaging operations, making the VSP2264GSJ suitable for battery-powered digital still cameras with intermittent capture duty cycles.