Texas Instruments THS4503CDGKRG4

Overview

THS4503CDGKRG4 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).

For engineers reviewing the THS4503CDGKRG4 datasheet, THS4503CDGKRG4 pinout, THS4503CDGKRG4 application, or THS4503CDGKRG4 equivalent, this page provides verified specifications, package mapping to MSOP-8 PowerPAD™, VOCM interface behavior, thermal derating guidance (max 60°C junction to prevent oscillation), and validated alternatives for single-ended-to-differential conversion and high-linearity receiver chains.

Technical Context

The THS4503CDGKRG4 implements a fully differential architecture with symmetrical input and output stages, supporting both single-ended and differential inputs while maintaining >70 dB CMRR across its ±3.4 V input common-mode range (±5 V supply). Its VOCM pin enables precise setting of output common-mode voltage between 1 V and 4 V in single-supply operation, with 180 MHz small-signal bandwidth and ±0.1 V gain error over temperature.

Unlike the THS4502, the THS4503CDGKRG4 omits power-down functionality - eliminating PD pin usage and simplifying biasing in continuous-operation systems. It operates from ±5 V, ±7.5 V, or 4.5–15 V single supplies, drawing 20–31 mA quiescent current depending on supply and temperature, with thermal performance governed by the DGK package's θJA = 260°C/W rating.

Key Specifications

Pinout & Package

The THS4503CDGKRG4 is housed in an 8-pin MSOP PowerPAD™ (DGK) package with exposed thermal pad on underside, requiring solder connection to PCB ground plane for thermal management and optimal ac performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4502CDGKRG4, THS4503CDGKRG4 removes power-down overhead for simpler biasing and reduced layout risk; compared with THS4521IRGTR, it trades bandwidth for VOCM control and proven 14-bit linearity - making it the preferred choice for precision ADC interface where common-mode alignment is mandatory.

Availability

THS4503CDGKRG4 is available at Aetrix Electronics and suitable for high-speed data acquisition, wireless infrastructure RF front-ends, and medical imaging systems requiring stable component supply and long-term production continuity.

Supply support for THS4503CDGKRG4 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 amplifiers and precision signal chain solutions.

The THS4503 forms part of TI's high-linearity differential amplifier product line, designed specifically for demanding ADC driver, IF signal conditioning, and differential communication applications where distortion, noise, and common-mode control are critical.

FAQ

What is the maximum junction temperature for reliable operation of the THS4503CDGKRG4?

The THS4503CDGKRG4 must not exceed +60°C junction temperature during continuous operation to prevent low-level oscillation. This requirement is strictly enforced in the datasheet's "Maximum Die Temperature to Prevent Oscillation" section. Thermal design must use the PowerPAD™ as a thermal path to PCB copper; θJA = 260°C/W necessitates adequate copper area and via count beneath the exposed pad to maintain safe junction temperatures under full load.

Does the THS4503CDGKRG4 support single-supply operation, and what is the valid VOCM input range?

Yes, the THS4503CDGKRG4 supports single-supply operation from 4.5 V to 15 V. In 5 V single-supply mode, the VOCM pin accepts 1.0 V to 4.0 V, allowing precise setting of output common-mode voltage - e.g., 2.5 V to match a typical ADC reference. The VOCM control loop maintains ±0.1 V gain accuracy and exhibits 180 MHz bandwidth, enabling dynamic common-mode adjustment without signal degradation.

How does the THS4503CDGKRG4 differ from the THS4502CDGKRG4 in pin configuration and functionality?

The THS4503CDGKRG4 replaces Pin 6 (PD) of the THS4502CDGKRG4 with NC (no connect), removing power-down capability. All other pins - VIN−, VIN+, VOCM, VS+, VOUT+, VS−, VOUT− - are functionally and physically identical. No PCB layout changes are required when substituting THS4503CDGKRG4 for THS4502CDGKRG4 in non-power-gated designs, though the PD trace must be left unconnected or grounded per TI layout guidelines.

What is the recommended decoupling strategy for the THS4503CDGKRG4 supply pins?

Each supply pin (VS+ and VS−) requires local decoupling with a 0.1 µF ceramic capacitor placed ≤2 mm from the pin, plus a bulk 10 µF tantalum or aluminum electrolytic capacitor within 10 mm. The PowerPAD™ must be soldered to a solid ground plane with ≥4 thermal vias (0.3 mm diameter) to minimize inductance and ensure stable high-frequency operation. Poor decoupling directly degrades PSRR and increases harmonic distortion above 10 MHz.

Can the THS4503CDGKRG4 drive a 50 Ω differential load, and what is the resulting output swing?

Yes, the THS4503CDGKRG4 can drive a 50 Ω differential load (25 Ω per side), delivering ±7.4 V differential swing at ±5 V supply (14.8 VPP) with <0.1% THD+N up to 10 MHz. At higher frequencies, output current limit (100 mA min) constrains swing - e.g., ±3.3 V at 30 MHz into 1 kΩ. For 50 Ω systems, use series termination (e.g., 24.9 Ω per leg) to preserve bandwidth and match characteristic impedance without sacrificing linearity.