Texas Instruments THS4503IDGNR

Overview

THS4503IDGNR 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 THS4503IDGNR datasheet, THS4503IDGNR pinout, THS4503IDGNR application, or THS4503IDGNR equivalent, key selection criteria include its ±5 V / 5 V supply flexibility, MSOP-8 PowerPAD™ package thermal performance, VOCM-controlled output common-mode setting, and absence of power-down functionality compared to THS4502.

Technical Context

The THS4503IDGNR employs a fully differential architecture with symmetrical input and output stages, supporting both single-ended-to-differential and differential-to-differential signal conversion. Its centered input common-mode range (±3.4 V at ±5 V supply) and VOCM terminal enable precise DC-coupled interfacing with modern ADCs requiring programmable common-mode bias.

Unlike the THS4502, the THS4503 lacks a power-down pin (PD), resulting in fixed quiescent current (23–34 mA at ±5 V) and eliminating turn-on/turnoff timing constraints. Its 52 dBm OIP3 at 30 MHz and 6.8 nV/√Hz input voltage noise reflect optimization for wideband linearity over ultra-low-noise operation.

Key Specifications

Pinout & Package

The THS4503IDGNR is housed in an 8-pin MSOP package with exposed thermal pad (PowerPAD™), requiring solder connection to PCB ground plane for thermal dissipation and optimal AC performance. Junction temperature must remain ≤60°C to prevent low-level oscillation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4502IDGNR, THS4503IDGNR eliminates power-down complexity and reduces BOM count by removing PD-related support components; versus LMH5401RTVT, it trades raw bandwidth for integrated VOCM control and simplified layout in sub-500 MSPS data acquisition.

Availability

THS4503IDGNR is available at Aetrix Electronics and suitable for high-linearity ADC preamplification, wireless communication receiver chains, and active differential filtering requiring stable component supply across industrial temperature ranges (-40°C to +85°C).

Supply support for THS4503IDGNR 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 THS450x product line was engineered specifically for high-fidelity signal chain applications demanding wide bandwidth, ultra-low distortion, and precise differential signaling - targeting data acquisition, communications infrastructure, and test equipment markets.

FAQ

What is the maximum junction temperature limit for reliable operation of the THS4503IDGNR?

The THS4503IDGNR must be operated with junction temperature ≤60°C to prevent low-level oscillation. This is a hard reliability constraint - not a recommended maximum. At ambient temperatures exceeding 60°C or under high-power dissipation, thermal design (e.g., PowerPAD™ soldering to internal ground plane) is mandatory to maintain safe TJ. Exceeding 60°C risks instability that cannot be corrected via external compensation.

Does the THS4503IDGNR support single-supply operation, and what is the minimum supply voltage?

Yes, the THS4503IDGNR supports true single-supply operation from 4.5 V to 15 V. At 5 V supply, it delivers 320 MHz small-signal bandwidth and ±3.3 V differential output swing referenced to 2.5 V VOCM. The minimum specified operating voltage is 4.5 V; operation below this violates guaranteed AC performance and may cause output clipping or reduced open-loop gain.

How does the VOCM pin function in the THS4503IDGNR, and what happens if left floating?

The VOCM pin sets the DC common-mode voltage of the differential outputs. When driven externally (e.g., to 2.5 V), outputs center at that voltage. If left floating, the THS4503IDGNR defaults to ~2.5 V (±0.1 V) at 5 V supply due to internal biasing - but this default is temperature-sensitive and not recommended for precision applications. External VOCM drive ensures stability and matching to ADC reference levels.

What is the difference between THS4503IDGNR and THS4502IDGNR beyond the presence of a power-down pin?

Beyond the missing PD pin, THS4503IDGNR has identical AC/DC specifications to THS4502IDGNR in active mode - same 370 MHz bandwidth, 2800 V/µs slew rate, and -95 dBc IMD3. However, THS4503IDGNR exhibits slightly better VOCM input impedance (25 kΩ vs 100 µA bias current in THS4502 power-down state) and eliminates turn-on/turnoff timing uncertainty, simplifying timing-critical signal paths.

Can the THS4503IDGNR drive a 50 Ω differential load directly, and what is the expected output swing?

The THS4503IDGNR is not rated for direct 50 Ω differential load driving. Its specified output current drive is 100 mA minimum into 20 Ω (per side), but sustained 50 Ω loading exceeds thermal limits in the MSOP-8 PowerPAD™ package. For 50 Ω systems, use a 1:1 balun or external current-boosting stage. Into 800 Ω, it delivers ±7.4 V differential swing at ±5 V supply - sufficient for most ADC inputs with appropriate gain scaling.