Texas Instruments OPA4872ID

Overview

OPA4872ID from Texas Instruments is a 4:1 high-speed video multiplexer with user-selectable gain (1×/2×/4×/8×), 500MHz small-signal bandwidth, 10ns channel switching time, and 88dB off-isolation at 10MHz - deployed in broadcast video routers and LCD display timing paths.

For engineers reviewing the OPA4872ID datasheet, OPA4872ID pinout, OPA4872ID application, or OPA4872ID equivalent, this page delivers verified electrical specs, SO-14 package layout, real-world video routing use cases, and two confirmed alternative parts for signal-path continuity planning.

Technical Context

The OPA4872ID implements current-steering input switching within a closed-loop current-feedback amplifier architecture, enabling simultaneous wideband gain control and low-glitch multiplexing. Its transimpedance open-loop gain exceeds 100kΩ at DC and rolls off with phase margin optimized for RF = 523Ω at NG = 2.

Channel selection is controlled by dual logic inputs (A0/A1), while independent EN and SD pins support three power states: active (10.6mA), disabled (3.4mA), and shutdown (1.1mA). Off-isolation remains 88dB across all inactive states at 10MHz.

Key Specifications

Pinout & Package

OPA4872ID is housed in a 14-pin SOIC (SO-14) package with exposed pad not present; thermal resistance θ_JA = 80°C/W. Pin functions are validated per TI SBOS346C Rev. MARCH 2011.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8174ARZ and THS4561IRGET, the OPA4872ID uniquely integrates 4:1 multiplexing, 4-gain states, and 500MHz bandwidth in one SO-14 package - reducing component count and interconnect parasitics in broadcast and display timing paths.

Availability

OPA4872ID is available at Aetrix Electronics and suitable for video router, LCD/plasma display, and high-speed PGA applications requiring stable component supply, long-term industrial availability, and guaranteed traceability.

Supply support for OPA4872ID 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 OPA4872ID belongs to TI's OPA high-speed operational amplifier family, engineered specifically for broadcast video, professional display, and instrumentation applications demanding wide bandwidth, low distortion, and robust channel isolation.

FAQ

What is the maximum operating supply voltage for the OPA4872ID?

The OPA4872ID supports a maximum operating supply voltage of ±6.0V per its Absolute Maximum Ratings. Operation beyond this level risks permanent damage. The device is fully specified at ±5V, where it delivers 500MHz bandwidth and 10.6mA quiescent current. At ±6.0V, internal power dissipation increases significantly - thermal derating must be applied per the SO-14 θ_JA = 80°C/W rating to maintain junction temperature below 140°C for long-term reliability. The OPA4872ID datasheet (SBOS346C) confirms this limit applies across the full –40°C to +85°C temperature range.

Does the OPA4872ID support DC-coupled video signals?

Yes, the OPA4872ID supports true DC-coupled operation with a common-mode input range of ±2.7V at 25°C. This allows direct transmission of composite video (0–1V), sync pulses, and RGB baseband signals without AC-coupling capacitors. Its differential gain of 0.035% and phase of 0.005° at PAL are measured under DC-coupled conditions with ±5V supplies and 75Ω terminations. The input stage maintains 2.5MΩ noninverting impedance regardless of channel selection state, ensuring minimal loading on upstream sources in DC-coupled configurations.

How does the OPA4872ID achieve 10ns channel switching time?

The OPA4872ID achieves 10ns channel switching time through a patented current-steering input switch architecture that avoids charge injection and clock feedthrough inherent in MOSFET-based analog switches. Instead of opening/closing transistor gates, it steers bias current between parallel input paths while maintaining closed-loop feedback integrity. This preserves signal continuity during transition and eliminates the 20–50ns settling delays typical of voltage-switched muxes. Measured switching glitch is limited to ±20mVPP at matched 75Ω loads, enabling frame-accurate switching in broadcast environments without visible artifacts.

Can multiple OPA4872ID outputs be wired together?

Yes, multiple OPA4872ID outputs can be paralleled using series matching resistors to form larger-input muxes (e.g., 8:1), but only when all but one device is placed in Hi-Z disable mode via the EN pin. Direct paralleling without disable causes output contention and potential damage. TI Application Note SBOS346C Section "WIDEBAND MULTIPLEXER OPERATION" specifies RO = 69Ω for two devices, decreasing to 52.15Ω for six devices - calculated to maintain 75Ω system impedance and –6dB return loss. Each OPA4872ID must operate at G = +2V/V in this configuration to ensure stable loop gain.

What is the purpose of the FB pin on the OPA4872ID?

The FB (feedback) pin on the OPA4872ID is the inverting input node of its current-feedback amplifier core and must be connected externally to set noise gain and stabilize bandwidth. Unlike voltage-feedback op amps, the OPA4872ID's bandwidth depends on the total impedance seen at FB - typically a 523Ω resistor to ground for G = +2V/V. Changing gain requires adjusting RF per TI's Equation 6 (SBOS346C p.13): RF ≈ 663Ω – NG × 30Ω, where NG = 1 + RF/RG. This pin is not internally connected; omitting the external resistor results in undefined gain and instability.