Texas Instruments THS4503IDGKRG4

Overview

THS4503IDGKRG4 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 under ±5 V supply, serving as a low-distortion ADC driver for 14-bit, 80 MSPS converters.

For engineers reviewing the THS4503IDGKRG4 datasheet, THS4503IDGKRG4 pinout, THS4503IDGKRG4 application, or THS4503IDGKRG4 equivalent, key selection criteria include differential output swing (±7.4 V min), VOCM-controlled common-mode output (2.5 V default), thermal oscillation limit (≤60°C junction), and MSOP-8 PowerPAD™ package thermal performance.

Technical Context

The THS4503IDGKRG4 implements a fully differential architecture with centered input common-mode range (±3.4 V at –40°C to +85°C) and independent VOCM input enabling precise output common-mode voltage setting. Its high open-loop gain (50 dB min) and 80 dB CMRR support accurate single-ended-to-differential conversion without feedback network sensitivity to layout asymmetry.

Unlike the THS4502, this variant omits power-down functionality-pin 6 is NC-not supporting enable/disable control. Its internal compensation ensures stability into 800 Ω loads while maintaining 0.1 dB flatness up to 150 MHz, making it suitable for wideband active filtering and RF receiver chain IF amplification where DC-coupled differential signaling is required.

Key Specifications

Pinout & Package

The THS4503IDGKRG4 is housed in an 8-pin MSOP package with exposed thermal pad (PowerPAD™), requiring solder connection to a PCB ground plane for thermal dissipation and optimal ac performance. Package dimensions: 3.0 mm × 3.0 mm × 1.0 mm (height), 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4502IDGKRG4, THS4503IDGKRG4 removes power-down complexity for fixed-on applications, while THS4521IRGTR trades supply versatility for higher frequency linearity-making THS4503IDGKRG4 the optimal balance of bandwidth, distortion, and ±5 V compatibility in mid-band data acquisition.

Availability

THS4503IDGKRG4 is available at Aetrix Electronics and suitable for high-speed data acquisition, wireless receiver IF stages, active differential filtering, and single-ended-to-differential conversion requiring stable component supply across industrial temperature ranges.

Supply support for THS4503IDGKRG4 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 THS4503IDGKRG4 belongs to TI's high-linearity fully differential amplifier product line, engineered specifically for precision ADC driving and wideband signal conditioning in test equipment, communications infrastructure, and medical imaging systems.

FAQ

What is the maximum junction temperature specification for THS4503IDGKRG4 to prevent oscillation?

The THS4503IDGKRG4 must be operated with junction temperature ≤60°C to avoid low-level oscillation, as documented in the "Maximum Die Temperature to Prevent Oscillation" section of the datasheet. This limit applies regardless of ambient temperature and requires thermal design using the MSOP-8 PowerPAD™ with proper PCB copper pour and via stitching to maintain safe operating conditions during continuous 34 mA quiescent current draw.

Does THS4503IDGKRG4 support single-supply operation, and what is the recommended VOCM configuration?

Yes, THS4503IDGKRG4 supports single-supply operation from 4.5 V to 15 V. When using +5 V supply, VS– is connected to GND, and VOCM is typically biased at 2.5 V (e.g., via resistor divider) to set the output common-mode midpoint. With VOCM left floating, the device defaults to ~2.5 V output common-mode, with ±0.10 V tolerance over temperature-suitable for interfacing with 2.5 V-referenced ADCs without external biasing.

How does the pinout of THS4503IDGKRG4 differ from THS4502IDGKRG4?

The THS4503IDGKRG4 and THS4502IDGKRG4 share identical pin assignments except for pin 6: on THS4502IDGKRG4 it is PD (power-down control), while on THS4503IDGKRG4 it is NC (no connect). This means THS4503IDGKRG4 cannot be powered down and requires no external logic on pin 6, simplifying PCB layout and control firmware-but also eliminating standby current reduction capability.

What load conditions achieve the specified 370 MHz bandwidth and –95 dBc IMD3 for THS4503IDGKRG4?

The 370 MHz small-signal bandwidth and –95 dBc third-order intermodulation distortion are measured under specific conditions: ±5 V supplies, G = +1, Rf = Rg = 392 Ω, RL = 800 Ω, PIN = –20 dBm, and 30 MHz tone spacing. Deviations-such as heavier loads (<800 Ω), higher gain configurations, or elevated temperatures-reduce both bandwidth and linearity; design validation must replicate these test conditions for datasheet-compliant performance.

Is THS4503IDGKRG4 compatible with 14-bit ADCs operating at 80 MSPS, and what design considerations ensure optimal ENOB?

Yes, THS4503IDGKRG4 is explicitly characterized for 14-bit, 80 MSPS ADC driving per the datasheet application circuit. To preserve effective number of bits (ENOB), maintain matched 50 Ω source termination on VIN+ and VIN–, use symmetric microstrip routing for VOUT+/VOUT–, implement 0.1 µF + 10 µF local supply decoupling at VS+/VS–, and ensure VOCM is stabilized to within ±10 mV of target (e.g., 2.5 V) to minimize common-mode-induced offset drift in THS4503IDGKRG4 output.