Texas Instruments OPA4872IDR

Overview

OPA4872IDR from Texas Instruments is a 4:1 high-speed multiplexer with integrated programmable-gain amplifier functionality, operating at ±5V supply, delivering 500MHz small-signal bandwidth, 10ns channel switching time, and 0.1dB gain flatness to 120MHz - deployed in professional video routing and LCD display signal path selection.

For engineers reviewing the OPA4872IDR datasheet, OPA4872IDR pinout, OPA4872IDR application, or OPA4872IDR equivalent, key selection criteria include channel isolation (88dB), output glitch magnitude (±20mV typ), shutdown current (1.1mA), and SO-14 package compatibility with high-density video PCB layouts.

Technical Context

The OPA4872IDR implements a patented current-steering input switch architecture within a closed-loop current-feedback amplifier topology, enabling simultaneous wideband operation and low switching transient energy. Its transimpedance open-loop gain (Z_OL = 103 kΩ min) and 30Ω internal buffer impedance directly govern bandwidth stability across gain settings.

Channel selection is controlled by two logic inputs (A0/A1), while independent EN and SD pins support hierarchical power management: chip enable reduces quiescent current to 3.4mA, and shutdown further lowers it to 1.1mA with 75ns wake-up latency - all without compromising off-isolation (88dB @ 10MHz).

Key Specifications

Pinout & Package

OPA4872IDR is housed in a 14-pin SOIC (SO-14) package with standard 1.27 mm pitch, optimized for automated assembly and thermal dissipation (θ_JA = 80°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed multiplexer applications.

Compared with AD8174ARUZ and THS4521IRGTR, the OPA4872IDR uniquely integrates 4:1 switching, programmable gain, and sub-10 ns settling in a single SO-14 package - reducing BOM count and interconnect parasitics critical for >100 MHz video fidelity.

Availability

OPA4872IDR is available at Aetrix Electronics and suitable for video router, LCD display interface, and high-speed PGA applications requiring stable component supply, long-term industrial availability, and traceable sourcing.

Supply support for OPA4872IDR 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 signal conditioning and video infrastructure solutions.

The OPA4872IDR belongs to TI's high-bandwidth current-feedback op amp product line, engineered specifically for broadcast video, medical imaging, and test equipment demanding sub-10 ns switching, ultra-low glitch, and DC-coupled wideband signal routing.

FAQ

What is the maximum load capacitance the OPA4872IDR can drive without instability?

The OPA4872IDR maintains stable operation with up to 100 pF capacitive load when configured with recommended series resistance (RS) per Figure 5 in the datasheet. For loads exceeding 100 pF - such as ADC input capacitors - an external RS of 10–47 Ω is required to preserve phase margin and prevent peaking. This behavior is verified in TI's SBOS346C characterization across temperature and supply conditions.

Does the OPA4872IDR support single-supply operation?

No, the OPA4872IDR is specified and characterized exclusively for dual-supply operation from ±3.5 V to ±6.0 V. Its input common-mode range extends to ±2.7 V (min) and output swing is asymmetric under single-rail bias. Attempting single-supply use violates absolute maximum ratings and degrades distortion, bandwidth, and channel isolation - confirmed in Electrical Characteristics Table 1.

How does the OPA4872IDR achieve 0.1dB gain flatness to 120MHz?

The OPA4872IDR achieves 0.1dB gain flatness to 120MHz through internal compensation optimized for RF = 523 Ω at NG = 2, combined with its current-feedback architecture's inherent gain-bandwidth independence. This is validated in Figure 1 (Small-Signal Frequency Response) and supported by the 500MHz bandwidth spec at both small- and large-signal conditions - not extrapolated or estimated.

Can multiple OPA4872IDR outputs be wired together to increase input count?

Yes - TI's Application Information (Section 8.2.3) explicitly documents parallel connection of OPA4872IDR outputs to build 8:1 or larger multiplexers. Each output must be isolated with a matching resistor (e.g., 69 Ω for two devices) to maintain 75 Ω system impedance and prevent loading-induced bandwidth collapse. This configuration is used in production 8-to-1 video multiplexers.

What is the purpose of the optional 0.01 µF capacitor between V+ and V− pins?

The optional 0.01 µF capacitor between V+ and V− pins improves second-harmonic distortion by 3–6 dB in bipolar supply operation, as documented in Figure 27 and Application Information. It suppresses supply rail coupling that modulates the internal current-steering switch node - a design detail validated in TI's SBOS346C test circuit implementation.