Texas Instruments VSP2582RHNR

Overview

VSP2582RHNR from Texas Instruments is a 12-bit, 36-MHz CCD analog front-end IC for digital cameras, integrating correlated double sampling (CDS), programmable gain amplification (–9 dB to +35 dB), and input clamping with optical black (OB) level calibration. It processes CCD output signals in portable imaging systems requiring low power (85 mW at 3.0 V), stable black-level reference, and high SNR (78 dB input-referred at 0 dB CDS gain).

For engineers reviewing the VSP2582RHNR datasheet, VSP2582RHNR pinout, VSP2582RHNR application, or VSP2582RHNR equivalent, this device serves as a complete mixed-signal signal chain solution for CCD-based image capture-requiring attention to SHP/SHD timing alignment, OB loop capacitor selection (COB), serial register configuration (SDATA/SCLK/SLOAD), and thermal pad soldering per QFN-36 RHN package.

Technical Context

The VSP2582RHNR implements a two-stage gain architecture: analog CDS gain (–3 dB to +9 dB in 3-dB steps) followed by digital PGA (–6 dB to +26 dB in 0.03125-dB steps), enabling precise illumination-adaptive signal scaling without degrading OB clamp stability. Its CDS block uses dual-sampling clocking (SHP/SHD) with programmable polarity and sub-pixel sampling delay (0–2 ns).

Signal integrity is maintained via separate analog/digital supplies (VCC/VDD = 2.7–3.6 V), dedicated AGND/DGND planes, and on-chip reference generation (REFP = 1.5 V, REFN = 1.0 V). The OB calibration loop employs a 10-bit DAC driving COB to achieve 40.7 μs time constant (with 0.1 μF), supporting hot-pixel rejection and fast black-level recovery after gain changes.

Key Specifications

Pinout & Package

Package: QFN-36 (RHN), 6 mm × 6 mm, exposed thermal pad (θJA = 81.0°C/W), RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CCD analog front-end applications.

Compared with VSP2582RHNR, AD9945KSTZ offers integrated timing generation but lower CDS flexibility and no hot-pixel mitigation, while TAS5381AIPAG is functionally misaligned for CCD signal conditioning - making VSP2582RHNR uniquely suited for portable, OB-critical, and thermally constrained CCD imaging designs.

Availability

VSP2582RHNR is available at Aetrix Electronics and suitable for digital camera modules, security surveillance systems, and medical endoscopy equipment requiring stable component supply, long-lifecycle support, and QFN-36 thermal performance.

Supply support for VSP2582RHNR 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 technologies, with leadership in precision signal chain solutions.

The VSP2582RHNR belongs to TI's CCD analog front-end product line, engineered specifically for high-fidelity, low-power digitization of charge-coupled device outputs in portable and industrial imaging systems.

FAQ

What is the function of the CLPOB and CLPDM pins on the VSP2582RHNR?

The CLPOB pin activates the optical black (OB) level calibration loop during OB pixel readout, enabling automatic offset compensation. The CLPDM pin enables input signal clamping to REFP (1.5 V) during dummy pixel intervals to restore DC bias. Both must be asserted separately - never simultaneously - and their active polarity is programmable via the Clk-Pol-ctrl register. This dual-clamp architecture ensures stable black-level reference and accurate pixel-level digitization in the VSP2582RHNR.

Does the VSP2582RHNR support true 12-bit performance across its full operating range?

Yes, the VSP2582RHNR guarantees no missing codes and specifies ±2 LSB integral nonlinearity (INL) and ±0.5 LSB differential nonlinearity (DNL) at 0 dB CDS gain and 0 dB DPGA gain. Measured SNR of 78 dB input-referred confirms effective resolution exceeds 12 bits under optimal conditions. Performance remains validated across the full –25°C to +85°C temperature range and 2.7–3.6 V supply, confirming true 12-bit fidelity in production use of the VSP2582RHNR.

How does the VSP2582RHNR handle black-level stability when digital gain is adjusted?

The VSP2582RHNR maintains black-level stability during digital gain changes because the optical black (OB) clamp loop operates upstream of the digital PGA stage. OB calibration occurs in the analog domain using CDS output, and the resulting clamp level is applied before digital gain scaling. This architecture ensures that black-level reference remains invariant regardless of DPGA setting - a key design feature confirmed in the VSP2582RHNR functional description and timing diagrams.

What thermal considerations apply to the VSP2582RHNR's QFN-36 RHN package?

The VSP2582RHNR in QFN-36 RHN package requires soldering of the exposed thermal pad to a solid copper plane for effective heat dissipation. With θJA = 81.0°C/W, junction temperature rise is ~6.9°C at 85 mW (3.0 V/36 MHz). TI recommends ≥4 thermal vias under the pad connected to inner-layer ground planes. The RHN variant's higher θJA versus RHH (31.7°C/W) reflects its tray packaging - thermal design must prioritize pad connectivity and airflow in compact camera modules using the VSP2582RHNR.

Can the VSP2582RHNR operate with a single 3.0 V supply, and how are analog and digital domains isolated?

Yes, the VSP2582RHNR operates from a single 3.0 V nominal supply, but it mandates separate analog (VCC) and digital (VDD) rail connections - both rated 2.7–3.6 V - with independent AGND and DGND grounds. Internal regulators and layout separation ensure analog signal integrity. Decoupling requires 0.1 μF (BYP/REFP/REFN) and 1000 pF (BYPP) capacitors placed near respective pins. This dual-supply, multi-ground architecture is essential to achieve 78 dB SNR and is explicitly required in all VSP2582RHNR reference designs.