Texas Instruments THS4502CDG4

Overview

THS4502CDG4 from Texas Instruments is a high-performance fully differential amplifier with power-down capability, designed 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 clean 14-bit ADC preamplification up to 40 MHz in wireless receiver chains and active filtering applications.

For engineers reviewing the THS4502CDG4 datasheet, THS4502CDG4 pinout, THS4502CDG4 application, or THS4502CDG4 equivalent, key selection criteria include its centered input common-mode range (±3.4 V at ±5 V supply), VOCM-controlled output common-mode voltage, power-down quiescent current ≤1.2 mA, and thermal oscillation limit at +60°C junction temperature.

Technical Context

The THS4502CDG4 employs a fully differential architecture with symmetrical input and output stages, supporting both single-ended-to-differential and differential-to-differential conversion. Its internal feedback network enables precise gain setting (G = +1 to +10) and maintains balance error < -58 dB across 100 kHz.

Power-down control is implemented via a dedicated PD pin with defined enable threshold (+2.1 V min) and disable threshold (0.7 V max) under 5-V operation, achieving turnoff delay ≤800 ns and quiescent current reduction from 31 mA to ≤1.2 mA.

Key Specifications

Pinout & Package

The THS4502CDG4 is housed in an 8-pin MSOP PowerPAD™ package (DGK suffix), optimized for thermal dissipation and compact layout. The exposed thermal pad must be soldered to a PCB copper 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 THS4503CDG4 and THS4500IDG4, the THS4502CDG4 uniquely combines power-down control, VOCM adjustability, and centered input range - making it optimal for portable, thermally sensitive, or dynamically reconfigurable signal chains.

Availability

THS4502CDG4 is available at Aetrix Electronics and suitable for high-speed data acquisition, wireless infrastructure, and test equipment applications requiring stable component supply and long-term manufacturability.

Supply support for THS4502CDG4 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 connectivity technologies with over 50 years of innovation in high-performance signal chain components.

The THS4502 product line targets high-fidelity, wideband signal conditioning for 14-bit+ data converters - emphasizing linearity, speed, and thermal stability in demanding RF and instrumentation applications.

FAQ

What is the maximum junction temperature specification for the THS4502CDG4 to prevent oscillation?

The THS4502CDG4 must be operated with junction temperature ≤ +60°C to avoid low-level oscillation. This is a hard thermal limit - not a reliability guideline. Proper thermal pad soldering to a PCB copper plane and adequate airflow are mandatory. Exceeding this temperature may cause subtle gain instability or spurious tones in sensitive receiver applications, and TI explicitly advises against new designs expecting >+60°C die temperature. The THS4502CDG4 datasheet specifies 125°C as maximum for continuous operation, but oscillation prevention requires stricter adherence to +60°C.

Does the THS4502CDG4 support single-supply operation, and what are the voltage limits?

Yes, the THS4502CDG4 supports single-supply operation from 4.5 V to 15 V. At 5 V supply, the input common-mode range is 1.0 V to 4.0 V (min), and the VOCM pin accepts 1.2 V to 3.7 V (min) to set output common-mode voltage. Output swing is ±2.6 V (min) into 1 kΩ load, referenced to VOCM. Single-supply use requires careful biasing of VIN+ and VIN− within the valid input range and proper VOCM selection to align with downstream ADC reference. The THS4502CDG4 does not support rail-to-rail input - its centered input architecture differs from the THS4500 series.

How does the power-down feature of the THS4502CDG4 behave during turn-on and turn-off transitions?

The THS4502CDG4 exhibits ≤1000 ns turnon time delay and ≤800 ns turnoff time delay, measured from PD pin voltage crossing thresholds to output settling within 1% of final value. Under 5 V supply, the device enables when PD ≥ +2.1 V (min) and disables when PD ≤ 0.7 V (max). During power-down, quiescent current drops to ≤1200 µA (max at 85°C), and input bias current reduces to ≤140 µA (max). The THS4502CDG4 retains full functionality immediately upon exit from power-down - no recalibration or warm-up is required. This makes it suitable for time-gated sampling or burst-mode communication systems.

What is the role of the VOCM pin on the THS4502CDG4, and how is it used in practice?

The VOCM pin on the THS4502CDG4 directly controls the DC common-mode voltage of the differential outputs (VOUT+ and VOUT−), allowing precise alignment to downstream ADC reference voltages such as 2.5 V or 1.25 V. When VOCM is left floating, the default output common-mode voltage is 2.5 V ±0.1 V (at 25°C) under 5 V supply. Driving VOCM with a low-impedance source (e.g., DAC output or resistor divider) sets the output midpoint - critical for maximizing dynamic range in DC-coupled ADC interfaces. The THS4502CDG4 maintains VOCM gain accuracy of 0.98–1.02 V/V and bandwidth of 180 MHz, ensuring minimal distortion of modulated common-mode signals.

Can the THS4502CDG4 drive standard 50 Ω coaxial cables or RF loads directly?

The THS4502CDG4 can drive 50 Ω loads differentially (i.e., 25 Ω per side) with ≥100 mA output current (min) at ±5 V supply, supporting peak-to-peak swings up to ±7.4 V into 1 kΩ but reduced to ±2.6 V into 1 kΩ at 5 V. For true 50 Ω single-ended termination, external resistive matching (e.g., 25 Ω series + 50 Ω shunt) is recommended to preserve balance and minimize reflections. The THS4502CDG4's closed-loop output impedance is 0.1 Ω (typ) at 1 MHz, enabling low-loss interfacing with precision ADC inputs or passive baluns. However, sustained 50 Ω loading at full swing may exceed thermal limits - derating and thermal pad connection are essential.