Texas Instruments THS4503CDGNR

Overview

THS4503CDGNR from Texas Instruments is a high-performance fully differential amplifier optimized for ADC preamplification and single-ended-to-differential signal conversion. 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-enabling 14-bit data acquisition systems up to 40 MHz.

For engineers reviewing the THS4503CDGNR datasheet, THS4503CDGNR pinout, THS4503CDGNR application, or THS4503CDGNR equivalent, key selection criteria include its centered input common-mode range (±3.4 V at 85°C), output common-mode voltage control (VOCM) interface, thermal oscillation limit (max 60°C junction), and MSOP-8 PowerPAD™ package for enhanced thermal dissipation in high-density layouts.

Technical Context

The THS4503CDGNR implements a fully differential architecture with symmetrical input and output stages, supporting both single-ended and differential inputs while maintaining balanced output drive. Its VOCM terminal enables precise control of differential output common-mode level, critical for interfacing with modern ADCs requiring fixed reference points.

Unlike the THS4502CDGNR, this variant omits power-down functionality-eliminating PD pin control logic and reducing quiescent current variation across enable states. It operates over ±5 V, ±7.5 V, or single 5–15 V supplies, with specified performance validated from -40°C to +85°C (I-suffix grade).

Key Specifications

Pinout & Package

The THS4503CDGNR is housed in an 8-pin MSOP package with exposed PowerPAD™ thermal pad (DGN suffix), measuring 3.0 mm × 3.0 mm × 1.0 mm. The PowerPAD must be soldered to a PCB thermal plane for reliable operation below 60°C junction temperature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4502CDGNR and THS4500CDGNR, the THS4503CDGNR uniquely combines VOCM control, centered input range, and absence of power-down circuitry-making it the optimal choice for fixed-gain, thermally constrained ADC driver applications demanding consistent linearity and simplified biasing.

Availability

THS4503CDGNR is available at Aetrix Electronics and suitable for high-speed data acquisition, wireless infrastructure, industrial analog I/O, and precision test equipment requiring stable component supply across extended temperature ranges.

Supply support for THS4503CDGNR 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 digital signal technologies with over 90 years of innovation in high-performance signal chain solutions.

The THS4503CDGNR belongs to TI's high-speed fully differential amplifier product line, engineered specifically for precision ADC driving, IF signal conditioning, and noise-sensitive communication systems demanding ultra-low distortion and wide bandwidth.

FAQ

What is the maximum recommended junction temperature for continuous operation of the THS4503CDGNR?

The THS4503CDGNR must not exceed +60°C junction temperature during continuous operation to prevent low-level oscillation. This limit is strictly enforced per TI's Application Information section. Thermal design-including PowerPAD soldering to a copper plane and proper airflow-must ensure TJ remains ≤60°C under worst-case load and ambient conditions. Exceeding this threshold risks instability and degraded distortion performance in the THS4503CDGNR.

Does the THS4503CDGNR support single-supply operation, and what is the minimum supply voltage?

Yes, the THS4503CDGNR supports single-supply operation from 4.5 V to 15 V. At 5 V nominal, it delivers 320 MHz small-signal bandwidth and 1300 V/µs slew rate-slightly reduced versus ±5 V operation but still sufficient for many 12–14 bit ADC interfaces. The device maintains full functionality including VOCM control and centered input common-mode range across this range, making the THS4503CDGNR viable for portable and low-voltage industrial systems.

How does the VOCM pin function in the THS4503CDGNR, and what happens if left floating?

The VOCM pin sets the DC common-mode voltage of the differential outputs (VOUT+ and VOUT−). When driven externally (e.g., to 2.5 V), it forces the output midpoint to that level. If left floating, the THS4503CDGNR defaults to ~2.5 V (±0.1 V) under 5 V supply-verified in electrical characteristics tables. However, TI recommends active VOCM biasing for production designs to ensure stability and repeatability, especially across temperature and process variation in the THS4503CDGNR.

What is the difference between THS4503CDGNR and THS4502CDGNR regarding pin compatibility and functionality?

The THS4503CDGNR and THS4502CDGNR share identical pinout and package (MSOP-8 DGN), but Pin 5 is NC (no connect) in THS4503CDGNR versus PD (power-down) in THS4502CDGNR. Functionally, THS4503CDGNR lacks power-down capability-offering lower design complexity and eliminating PD-related timing delays. This makes THS4503CDGNR preferable for always-on, thermally sensitive applications where PD functionality adds no value.

Can the THS4503CDGNR drive a 50 Ω differential load directly, and what are the implications?

The THS4503CDGNR is not rated for direct 50 Ω differential load driving: its specified output current is 100 mA min into 20 Ω (single-ended), and differential swing drops significantly below ±3.3 V at 1 kΩ under 5 V supply. Driving 50 Ω would exceed safe operating area, causing thermal overload and potential oscillation. For 50 Ω systems, use external current-boosting stages or select TI's THS3201/THS3491 series-never operate THS4503CDGNR into 50 Ω without verification in the specific application context.