Texas Instruments THS4500CDGN

Overview

THS4500CDGN from Texas Instruments is a wideband, low-distortion fully differential amplifier with power-down capability, designed as an ADC preamplifier and single-ended-to-differential converter. It delivers 370 MHz small-signal bandwidth, –90 dBc third-order intermodulation distortion at 30 MHz, and 2800 V/μs slew rate under ±5 V supply, enabling high-fidelity signal conditioning in RF receiver chains and high-speed data acquisition systems.

For engineers reviewing the THS4500CDGN datasheet, THS4500CDGN pinout, THS4500CDGN application, or THS4500CDGN equivalent, key selection criteria include its power-down control (PD pin), VOCM-adjustable common-mode output, differential output drive up to ±7.4 V into 1 kΩ, and compatibility with 12-bit/80-MSps ADC interfaces requiring ultra-low harmonic distortion.

Technical Context

The THS4500CDGN implements a fully differential architecture with independent input and output common-mode control paths. Its internal topology supports both single-ended and differential inputs while maintaining >70 dB CMRR and <0.1 Ω closed-loop output impedance, enabling precise gain-setting with external resistors (e.g., RF = RG = 392 Ω for G = +1).

Power-down functionality is implemented via a dedicated PD pin with defined enable/disable thresholds (≥–2.9 V ON, ≤–4.3 V OFF under ±5 V), reducing quiescent current from 34 mA to ≤1.2 mA. The VOCM terminal provides direct control of output common-mode voltage with 180 MHz small-signal bandwidth and ±3.4 V input range when operating on ±5 V supplies.

Key Specifications

Pinout & Package

The THS4500CDGN is housed in an 8-pin MSOP PowerPAD™ package (DGN), optimized for thermal dissipation and high-frequency performance. The exposed thermal pad must be soldered to a PCB ground plane per TI SLMA002/SLMA004 guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4500CDGN, THS4501CDGN removes power-down overhead but retains identical signal fidelity, while THS4130IDGN trades bandwidth and VOCM flexibility for higher voltage operation and lower noise-making it unsuitable as a drop-in replacement in ADC driver roles.

Availability

THS4500CDGN is available at Aetrix Electronics and suitable for wireless infrastructure, test equipment, and high-speed data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for THS4500CDGN 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-performance amplifier design.

The THS4500 series belongs to TI's high-speed differential amplifier product line, engineered specifically for ultra-linear signal conditioning in RF receiver chains and high-resolution ADC interfaces.

FAQ

What is the maximum supply voltage rating for the THS4500CDGN?

The THS4500CDGN has an absolute maximum supply voltage rating of 16.5 V across VS+ and VS− terminals. Operation beyond this limit risks permanent damage. Recommended operating range spans ±5 V to ±7.5 V dual supply or 4.5 V to 15 V single supply, with typical performance validated at ±5 V and 5 V configurations per the SLOS350F datasheet.

Does the THS4500CDGN require external compensation components?

No, the THS4500CDGN is internally compensated and stable for gains ≥ +1 with standard resistor feedback networks (e.g., RF = RG = 392 Ω). External compensation is not required for unity-gain or higher configurations, though layout best practices-including short traces, proper grounding, and decoupling capacitors (0.1 µF + 10 µF per supply rail)-are essential to maintain 370 MHz bandwidth and low distortion.

How does the VOCM pin affect THS4500CDGN output behavior?

The VOCM pin directly sets the DC common-mode voltage of the differential outputs (VOUT+ and VOUT−). When VOCM is tied to 2.5 V, outputs center at 2.5 V; floating VOCM defaults to ~0 V under ±5 V supply. The pin has 25 kΩ||1 pF input impedance and supports 180 MHz small-signal bandwidth, enabling dynamic common-mode adjustment in real-time applications like adaptive ADC biasing-critical for THS4500CDGN's role in precision data converters.

Can the THS4500CDGN drive a 50-Ω differential load?

Yes, the THS4500CDGN can drive a 50-Ω differential load (i.e., 25 Ω per side), delivering up to ±3.3 V swing at 5 V supply and ±7.4 V at ±5 V supply. However, output current is limited to 100 mA minimum (sink/source) under ±5 V conditions, so sustained full-swing operation into 50 Ω requires verification of thermal limits and PCB copper weight. For continuous 50-Ω driving, TI recommends heatsinking the DGN package's PowerPAD™ per SLMA002 guidelines.

What is the power-down recovery time for the THS4500CDGN?

The THS4500CDGN exhibits ≤1000 ns turn-on time delay and ≤800 ns turn-off time delay, measured from PD pin transition to output settling within 1% of final value. During power-down, quiescent current drops to ≤1200 μA while input bias current remains ≤260 μA, allowing rapid resumption of full performance without reinitialization-key for burst-mode receivers and energy-constrained THS4500CDGN deployments.