Texas Instruments THS4503IDRG4

Overview

THS4503IDRG4 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 THS4503IDRG4 datasheet, THS4503IDRG4 pinout, THS4503IDRG4 application, or THS4503IDRG4 equivalent, this device is selected for demanding analog front-ends requiring wide bandwidth, ultra-low distortion, rail-to-rail output swing under ±5 V supply, and precise VOCM tracking in single-ended-to-differential conversion and active filtering.

Technical Context

The THS4503IDRG4 implements a fully differential architecture with symmetrical input and output stages, supporting both single-ended and differential inputs while maintaining balanced differential outputs. Its centered input common-mode range (±3.4 V at ±5 V supply) and VOCM-controlled output common-mode voltage enable seamless interfacing with modern SAR and pipeline ADCs.

Unlike the THS4502IDRG4, the THS4503IDRG4 omits power-down functionality, resulting in higher quiescent current (23–34 mA) but improved thermal stability and simplified biasing. It operates across -40°C to +85°C and supports dual ±5 V, ±7.5 V, or single 4.5–15 V supplies.

Key Specifications

Pinout & Package

THS4503IDRG4 is housed in an 8-pin SOIC (D package) with exposed pad for thermal enhancement. Pin assignments are validated per TI SLOS352E Rev. October 2011.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4502IDRG4 and LMH5401IRGT, the THS4503IDRG4 uniquely balances wide bandwidth, VOCM programmability, and centered input range - making it the optimal choice for precision, medium-frequency ADC driver applications where power-down is unnecessary and output common-mode alignment is critical.

Availability

THS4503IDRG4 is available at Aetrix Electronics and suitable for high-speed data acquisition, wireless infrastructure, instrumentation, and medical imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for THS4503IDRG4 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, embedded processing, and connectivity technologies with over 50 years of innovation in precision amplifiers and data converter interfaces.

The THS4503 forms part of TI's high-speed differential amplifier product line, designed specifically for high-fidelity signal conditioning in data acquisition, communications, and test equipment where linearity, bandwidth, and VOCM control are essential.

FAQ

What is the maximum junction temperature limit to prevent oscillation in THS4503IDRG4?

The THS4503IDRG4 must not exceed +60°C junction temperature to avoid low-level oscillation. This is a hard design constraint - not a reliability limit. Thermal design must ensure θJA and board copper area keep TJ ≤ 60°C under worst-case ambient and power dissipation. TI explicitly advises against new designs expecting >60°C die temperature.

Does THS4503IDRG4 support single-supply operation, and what is the valid VOCM range?

Yes, THS4503IDRG4 supports single-supply operation from 4.5 V to 15 V. At 5 V supply, VOCM must be between 1.3 V and 3.7 V for proper function; the default floating VOCM voltage is 2.5 V ±0.1 V. VOCM input impedance is 25 kΩ || 1 pF, allowing direct connection to DAC outputs or precision resistive dividers.

How does THS4503IDRG4 differ from THS4502IDRG4 beyond the absence of power-down?

While both share identical AC performance and pinout, THS4503IDRG4 has no power-down pin (Pin 6 is NC), eliminating associated leakage and timing uncertainty. Its quiescent current is slightly higher (23–34 mA vs. 12–34 mA active, 0.8–1.2 mA shutdown), but thermal stability is improved - critical for continuous-operation instrumentation where oscillation risk must be minimized.

Can THS4503IDRG4 drive a 50 Ω differential load directly?

THS4503IDRG4 is rated for 100 mA output current into 20 Ω, so driving a 50 Ω differential load (25 Ω per leg) is well within specification. However, for optimal harmonic distortion and flatness, use 800 Ω load per leg (1.6 kΩ differential) with appropriate feedback resistors (e.g., Rf = Rg = 392 Ω) - matching the test conditions for -95 dBc IMD3 at 30 MHz.

What is the input common-mode voltage range for THS4503IDRG4 at ±5 V supply?

At ±5 V supply, the input common-mode voltage range for THS4503IDRG4 is ±3.4 V minimum (i.e., -3.4 V to +3.4 V referenced to ground). This "centered" range enables direct connection to op-amps, sensors, or DACs operating near rail without level-shifting circuitry - a key differentiator from non-centered FDA architectures.