Texas Instruments THS4503CDGN

Overview

THS4503CDGN 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 minimal harmonic degradation.

For engineers reviewing the THS4503CDGN datasheet, THS4503CDGN pinout, THS4503CDGN application, or THS4503CDGN equivalent, key selection criteria include its centered input common-mode range (±3.4 V at ±5 V supply), VOCM-controlled output common-mode voltage, absence of power-down functionality (distinguishing it from THS4502), and MSOP-8 PowerPAD™ package for thermal performance in space-constrained layouts.

Technical Context

The THS4503CDGN employs a fully differential architecture with symmetrical input and output stages, supporting both single-ended-to-differential and differential-to-differential conversion. Its open-loop gain exceeds 50 dB and common-mode rejection ratio remains ≥70 dB across temperature, ensuring robust noise immunity in mixed-signal environments.

Output common-mode control is implemented via a dedicated VOCM pin with 180 MHz small-signal bandwidth and ±0.1 V gain error (0.98–1.02 V/V), allowing precise DC-level setting independent of signal path. The device operates from ±5 V to ±7.5 V dual supplies or 4.5–15 V single supply, with quiescent current ranging 12–31 mA depending on configuration and temperature.

Key Specifications

Pinout & Package

The THS4503CDGN is housed in an 8-pin MSOP PowerPAD™ package (DGN), featuring exposed thermal pad for enhanced heat dissipation and improved ac performance. Pin 1 is VIN−, pin 2 is VIN+, pin 3 is VOCM, pin 4 is VS+, pin 5 is VOUT+, pin 6 is VS−, pin 7 is VOUT−, and pin 8 is NC (no connection) - confirming absence of power-down control versus THS4502.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4502CDGN, THS4503CDGN removes power-down functionality to simplify biasing and reduce layout sensitivity, while retaining identical linearity and bandwidth - making it preferable for always-on instrumentation. Versus LMH5401IRGT, THS4503CDGN offers superior input common-mode flexibility and integrated VOCM control at the cost of bandwidth, favoring cost-sensitive, medium-speed data acquisition.

Availability

THS4503CDGN is available at Aetrix Electronics and suitable for high-speed data acquisition, wireless receiver front-ends, active differential filtering, and single-ended-to-differential conversion applications requiring stable component supply and long-term production continuity.

Supply support for THS4503CDGN 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 signal chain solutions.

The THS450x family was engineered specifically for high-fidelity, wideband differential signal conditioning - targeting 14-bit+ data converters, communications infrastructure, and precision test equipment where linearity, bandwidth, and thermal stability are critical.

FAQ

What is the maximum junction temperature limit to prevent oscillation in the THS4503CDGN?

The THS4503CDGN must not exceed +60°C junction temperature during continuous operation to avoid low-level oscillation. This constraint is documented in the "Maximum Die Temperature to Prevent Oscillation" section of the datasheet. Thermal design must ensure θ_JA = 58.4°C/W and adequate PCB copper area under the PowerPAD™ to maintain safe die temperature under full-load conditions.

Does the THS4503CDGN support single-supply operation, and what is the minimum supply voltage?

Yes, the THS4503CDGN supports single-supply operation from 4.5 V to 15 V. At 4.5 V, the device maintains functional performance with reduced output swing (±2.6 V into 1 kΩ) and increased quiescent current variation. For reliable 14-bit linearity, TI recommends ≥5 V single supply or ±5 V dual supply per the recommended operating conditions table.

How does the VOCM pin function in the THS4503CDGN, and what happens if it is left floating?

The VOCM pin sets the DC common-mode voltage of the differential outputs with 0.98–1.02 V/V gain accuracy and 180 MHz bandwidth. If left floating, the THS4503CDGN defaults to ~2.5 V output common-mode voltage (±0.1 V) when powered from 5 V supply - but this value shifts with supply and temperature, so external biasing is required for precision applications.

What is the difference between THS4503CDGN and THS4502CDGN beyond the presence of the PD pin?

THS4503CDGN and THS4502CDGN share identical AC performance (370 MHz BW, -95 dBc IMD3), DC specs, and pinout except pin 8: THS4502CDGN uses PD (power-down), while THS4503CDGN uses NC. No electrical or thermal differences exist between the two in active mode; the THS4503CDGN simply omits power-down circuitry to reduce complexity and potential noise coupling.

Can the THS4503CDGN drive a 50 Ω differential load directly, and what is the expected output swing?

Yes, the THS4503CDGN can drive a 50 Ω differential load (i.e., 25 Ω per leg) with ≥100 mA output current capability. At ±5 V supply, it delivers ±7.4 V differential swing into 1 kΩ, but into 50 Ω the swing is limited by current compliance - typical usable swing is ±3.5 V differential (7 V_PP) before clipping, verified in the "Differential output current drive" specification.