Renesas TW2984-NA2-CR

Overview

TW2984-NA2-CR from Intersil is a 4-channel WD1 (960H)/D1-compatible video decoder and audio codec IC, integrating four 10-bit analog-to-digital converters, adaptive 4-H comb filters, digital sub-carrier and horizontal PLLs, and five audio ADCs plus one DAC. It supports NTSC/PAL auto-detection, ITU-R BT.656 YCbCr 4:2:2 output at 36/72/144 MHz (WD1) or 27/54/108 MHz (D1), and operates from 1.0V core and 3.3V I/O/analog supplies.

For engineers reviewing the TW2984-NA2-CR datasheet, TW2984-NA2-CR pinout, TW2984-NA2-CR application, or TW2984-NA2-CR equivalent, key selection considerations include its quad-channel CVBS decoding capability, programmable gain and white peak control per channel, integrated clock PLL with 27 MHz crystal input, 8 mm × 8 mm 68-pin QFN package, and dual-mode I²S/DSP audio interface supporting 8–48 kHz sampling.

Technical Context

The TW2984-NA2-CR implements a fully programmable analog front end per channel with built-in anti-alias filtering, clamping, and static/AGC gain control for Y, plus white peak control for CVBS. Its video processing path includes 4-H adaptive comb filtering, PAL delay line color phase correction, peaking, CTI, and digital sub-carrier PLL for precise chroma demodulation.

Digital timing is anchored by independent horizontal and sub-carrier PLLs supporting NTSC-M (3.579545 MHz), PAL-BDGHI (4.433619 MHz), and PAL-M/N variants; the integrated clock PLL generates 36/72/144 MHz (WD1) or 27/54/108 MHz (D1) pixel clocks from a single 27 MHz crystal. Audio subsystem provides five simultaneous ADC inputs, one DAC, and configurable I²S/DSP master/slave operation with programmable sample rates.

Key Specifications

Pinout & Package

Package: 68-pin QFN, 8 mm × 8 mm, 0.4 mm pitch, exposed thermal pad (Q68.8x8B). Pin functions validated per FN8583 Rev.0.00 datasheet pages 6–8.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel analog video decoder applications.

Compared with TW2984-NA2-CR, TW2864-NA2-CR reduces system cost but sacrifices 960H resolution, PAL color correction, and video quality features; ADV7180BCPZ offers higher per-channel SNR but forces 4× IC duplication, increasing layout complexity and total power over the integrated quad-channel solution.

Availability

TW2984-NA2-CR is available at Aetrix Electronics and suitable for security DVR systems, automotive rear-view camera multiplexing, industrial video monitoring hubs, and legacy broadcast signal conversion requiring stable component supply and long-term design continuity.

Supply support for TW2984-NA2-CR 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

Intersil (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and video interface ICs for industrial, automotive, and communications markets.

The TW2984-NA2-CR belongs to Intersil's TW29xx family of multi-channel video decoders, designed specifically for high-density analog video acquisition in cost- and space-constrained embedded systems requiring WD1/D1 compatibility and multi-standard support.

FAQ

What video standards does the TW2984-NA2-CR support?

The TW2984-NA2-CR supports NTSC-M, NTSC-4.43, PAL-B, PAL-D, PAL-G, PAL-H, PAL-I, PAL-M, PAL-N, PAL-N combination, and PAL-60 with automatic format detection. It decodes both WD1 (960H) and D1 resolutions per channel, and includes PAL delay line and digital sub-carrier PLL for accurate color phase correction across all supported standards. The TW2984-NA2-CR datasheet confirms full compliance with ITU-R BT.656 timing and data format requirements.

Does the TW2984-NA2-CR require external clock generation?

No, the TW2984-NA2-CR integrates a clock PLL that generates all required video and audio clocks-including 36/72/144 MHz (WD1) or 27/54/108 MHz (D1) pixel clocks-from a single 27 MHz fundamental-mode crystal connected to XTI/XTO pins. This eliminates the need for external clock synthesizers or oscillators, simplifying system design and reducing BOM count. The TW2984-NA2-CR specification sheet explicitly states "Single 27MHz crystal for all standards and both WD1 and D1 format."

How many audio channels can the TW2984-NA2-CR process simultaneously?

The TW2984-NA2-CR integrates five audio ADCs and one audio DAC, enabling simultaneous digitization of five analog audio inputs (AIN1–AIN5) and mixed analog output via AOUT. Audio data is routed through configurable I²S/DSP master or slave interfaces supporting 8/16/32/44.1/48 kHz sample rates and 8/16-bit PCM or μ-Law/A-Law encoding. This capability is confirmed in the "Audio Codec" section of the TW2984-NA2-CR datasheet (FN8583 Rev.0.00, page 1).

What is the package type and thermal characteristics of the TW2984-NA2-CR?

The TW2984-NA2-CR uses an 8 mm × 8 mm, 68-pin QFN package (Q68.8x8B) with exposed thermal pad and 0.4 mm pitch. It operates across –40°C to +85°C ambient temperature, with maximum junction temperature rated at +125°C. Total supply current is 188 mA (80 mA VDDV + 21 mA VDDA + 5 mA VDDAPLL + 28 mA VDDO + 54 mA VDDI), and the device includes dedicated analog and digital ground planes (VSSV, VSSA, VSSAPLL, VSS) for noise isolation. These specifications are documented in the TW2984-NA2-CR Parametric Information section (pages 9–11).

Can the TW2984-NA2-CR decode video formats other than WD1 and D1?

No-the TW2984-NA2-CR is specifically designed for WD1 (960H) and D1 (720×480/576) analog video decoding only. It does not support CIF, QCIF, VGA, HDMI, SDI, or digital video inputs. Its analog front end, ADC sampling rates, and output timing are optimized for composite video (CVBS) signals conforming to ITU-R BT.601/BT.656 timing structures at those two resolutions. The TW2984-NA2-CR datasheet states "4-CH WD1 (960H)/D1 Compatible Video Decoders" as its primary function and lists no other video format support.