Texas Instruments TLS1233N

Overview

TLS1233N from Texas Instruments is a triple-channel 100-MHz video preamplifier IC designed for RGB signal conditioning in mid-to-high-resolution color monitors. It integrates independent gain, contrast, and clamp control per channel, operates from a single 12-V supply, and delivers 7.8 V/V max voltage amplification with ±0.5 mV inter-channel output voltage matching.

For engineers reviewing the TLS1233N datasheet, TLS1233N pinout, TLS1233N application, or TLS1233N equivalent, key selection criteria include its 100-MHz bandwidth, digital-level 0–4 V control interface, integrated clamp circuitry, and 20-pin PDIP package optimized for analog video signal integrity in legacy display systems.

Technical Context

The TLS1233N implements three identical high-speed video amplifier channels with internal feedback resistors and dedicated CLAMP(+) and CLAMP CAP terminals per channel for DC level restoration. Each channel accepts 0–4 V analog control inputs for contrast and gain adjustment, with high-impedance inputs enabling direct interface to serial digital buses.

It features independent clamp gate control (CLAMP GATE), dual 12-V supplies (VCC1/VCC2), and built-in input bias voltage generation. The device supports precise inter-channel gain matching (±0.2 dB at AV(max)/AV(mid)/AV(low)) and achieves 60 dB crosstalk attenuation at 10 kHz - critical for RGB separation in CRT and early LCD monitor designs.

Key Specifications

Pinout & Package

Package: 20-pin plastic dual-in-line package (PDIP-N), JEDEC MS-001 compliant, 0.600-inch width, through-hole mountable with 0.100-inch lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM1203N and EL4583CN, the TLS1233N uniquely combines 100-MHz bandwidth, integrated clamp architecture, and 0–4 V digital-level control in a single 20-pin PDIP - reducing component count and improving RGB channel matching in legacy monitor front-ends.

Availability

TLS1233N is available at Aetrix Electronics and suitable for RGB CRT monitor front-ends, SVGA analog display interfaces, and legacy medical imaging displays requiring stable component supply and long-term obsolescence management.

Supply support for TLS1233N 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability silicon solutions for industrial, automotive, and consumer markets.

The TLS1233N belongs to TI's legacy video interface product line, engineered specifically for analog RGB signal conditioning in mid-to-high-resolution display systems requiring precision gain matching and DC level restoration.

FAQ

What is the primary function of the TLS1233N in an RGB video system?

The TLS1233N serves as a triple-channel video preamplifier with integrated DC clamp control, designed to condition red, green, and blue analog video signals in CRT and early LCD monitors. Its core function is to provide matched gain (7.8 V/V max), contrast and brightness adjustment via 0–4 V inputs, and per-channel DC level restoration - all within a single 20-pin PDIP package. This eliminates discrete op-amps and external clamp circuitry typically required in designs using the LM1203.

Does the TLS1233N require external feedback resistors for gain setting?

No, the TLS1233N incorporates internal feedback resistors, eliminating the need for external 390-Ω resistors per channel. This is confirmed in the datasheet's "APPLICATION INFORMATION" section and functional block diagram, where feedback paths are shown internally connected between each VIDEO OUT and CLAMP(−). The fixed 7.8 V/V maximum gain is achieved without external components, reducing layout sensitivity and improving thermal stability compared to discrete amplifier solutions.

What is the role of the CLAMP GATE pin on the TLS1233N?

The CLAMP GATE pin (Pin 10) enables synchronous DC clamping by controlling internal comparators that activate during horizontal blanking intervals. When driven low (0 V), clamp comparators turn on to restore the black level of each RGB channel; when high (≥2.4 V), clamping is disabled. This allows precise timing alignment with video sync signals and eliminates the need for external one-shot timers or clock dividers - a key differentiator from earlier video amplifiers like the LM1203.

Can the TLS1233N operate from a single 12-V supply?

Yes, the TLS1233N operates from two 12-V supplies (VCC1 and VCC2), both referenced to the same ground. While it uses dual supply pins, they are intended to be tied together externally to a common 12-V rail - as explicitly stated in the Absolute Maximum Ratings note: "All VCC terminals must be externally wired together to prevent internal damage." This configuration simplifies power delivery while maintaining isolation between input and output stages for optimal noise rejection.

Is the TLS1233N still in active production and RoHS compliant?

Yes, according to Texas Instruments' official packaging information dated July 2026, the TLS1233N is marked "Active" with "Production" status, packaged in PDIP (N) with 20 pins, and certified RoHS compliant with NIPDAU lead finish. It is supplied in tubes of 20 units and specified for 0°C to 70°C operation. TI confirms ongoing availability and full compliance with current environmental regulations - making it viable for new designs requiring long-lifecycle support in industrial and medical display applications.