Texas Instruments THS4503CDG4

Overview

THS4503CDG4 from Texas Instruments is a high-performance fully differential amplifier optimized for precision signal conditioning in high-speed data acquisition systems. It delivers 370 MHz small-signal bandwidth, 2800 V/µs slew rate, and -95 dBc third-order intermodulation distortion at 30 MHz - enabling 14-bit ADC preamplification up to 40 MHz with centered input common-mode range and output common-mode voltage control (VOCM). Its ±5 V or single 5 V supply operation supports wireless receiver chains and active filtering.

For engineers reviewing the THS4503CDG4 datasheet, THS4503CDG4 pinout, THS4503CDG4 application, or THS4503CDG4 equivalent, key selection criteria include differential linearity (OIP3 = 51 dBm), VOCM-controlled output swing (±7.4 V min, RL = 1 kΩ), thermal derating above +60°C junction temperature, and SOIC-8 package compatibility with PowerPAD™ thermal enhancement.

Technical Context

The THS4503CDG4 implements a fully differential architecture with symmetrical input and output stages, supporting both single-ended-to-differential and differential-to-differential conversion. Its centered input common-mode range (±3.4 V at TA = 85°C) and VOCM terminal enable precise DC-coupled biasing of downstream ADCs without external level-shifting circuitry.

Unlike the THS4502CDG4, the THS4503CDG4 omits power-down functionality - simplifying control logic but requiring continuous quiescent current management (23–34 mA over temperature). Its open-loop gain (≥50 dB) and CMRR (≥70 dB) are maintained across ±5 V and 5 V supplies, ensuring stable closed-loop performance in mixed-signal front-ends.

Key Specifications

Pinout & Package

THS4503CDG4 is housed in an 8-pin SOIC package (D suffix) with exposed thermal pad (PowerPAD™) on the underside, requiring solder connection to a PCB copper plane for thermal dissipation. The package complies with JEDEC MS-012AC and supports reflow soldering per IPC/JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fully differential amplifier applications.

Compared with THS4502CDG4 and THS4500IDG4, the THS4503CDG4 provides the optimal balance of linearity (−95 dBc IMD3), bandwidth (370 MHz), and VOCM flexibility for fixed-supply ADC driver designs - without power-down complexity or rail-inclusive input limitations.

Availability

THS4503CDG4 is available at Aetrix Electronics and suitable for high-speed data acquisition, wireless infrastructure, and medical imaging systems requiring stable component supply and long-term manufacturability.

Supply support for THS4503CDG4 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 and embedded processing technologies, with decades of expertise in high-speed amplifier design and manufacturing.

The THS4503CDG4 belongs to TI's high-performance fully differential amplifier product line, engineered specifically for precision signal conditioning in wideband data converters and communications infrastructure equipment.

FAQ

What is the maximum junction temperature limit for reliable operation of the THS4503CDG4?

The THS4503CDG4 must not exceed +60°C junction temperature during continuous operation to prevent low-level oscillation. This thermal constraint is documented in the "Maximum Die Temperature to Prevent Oscillation" section of the datasheet. Designers must use the SOIC-8 PowerPAD™ thermal pad with adequate PCB copper area and ensure ambient conditions allow for safe thermal dissipation - especially under ±5 V, 34 mA worst-case quiescent current.

Does the THS4503CDG4 support single-supply operation, and what is the VOCM default voltage in that configuration?

Yes, the THS4503CDG4 operates from a single 5 V supply (VS+ = 5 V, VS− = GND). In this mode, the VOCM pin defaults to 2.5 V when left floating - matching typical mid-scale references for 5 V ADCs. The VOCM input range is 1.3 V to 3.7 V (min, TA = 85°C), allowing precise adjustment to match specific ADC requirements without external buffering.

How does the THS4503CDG4 differ from the THS4502CDG4 in terms of pin compatibility and functional behavior?

The THS4503CDG4 and THS4502CDG4 share identical pinouts and AC/DC specifications, except Pin 6: THS4502CDG4 uses it as a power-down (PD) control input, while THS4503CDG4 leaves it as NC (no connect). No PCB changes are required when substituting THS4503CDG4 for THS4502CDG4 in non-power-down applications - but the PD pin must be tied to VS+ (for ±5 V) or 2.1 V (for 5 V) to ensure full enablement if reused.

What is the minimum load resistance the THS4503CDG4 can drive while maintaining specified distortion performance?

The THS4503CDG4 maintains −94 dBc third-order IMD at 30 MHz with RL = 800 Ω (differential), as tested in the datasheet. Driving lower loads (e.g., 200 Ω) increases distortion due to increased output current and thermal effects - measured IMD3 degrades to −85 dBc at RL = 400 Ω. For optimal linearity, use RL ≥ 800 Ω or add series isolation resistors to preserve bandwidth and distortion specs.

Can the THS4503CDG4 be used with a 12 V single supply, and what are the resulting output swing limits?

Yes, the THS4503CDG4 supports 12 V single supply (VS+ = 12 V, VS− = GND), with specified operation up to 15 V. Under these conditions and with VOCM = 6 V, the differential output swing is limited to ±3.3 V (min, RL = 1 kΩ, TA = 85°C) - constrained by internal headroom and quiescent current increase. Output swing improves with lower gains and higher RL values, but thermal management becomes critical above 25 mA quiescent current.