Texas Instruments OPA4820ID

Overview

OPA4820ID from Texas Instruments is a quad, unity-gain stable, voltage-feedback operational amplifier optimized for high-speed, low-noise analog signal conditioning. It delivers 220MHz bandwidth at G = +2, ±85mA output current, and 2.5nV/√Hz input voltage noise, enabling precision video line driving, ADC preamplification, and optical channel amplification in space-constrained industrial and portable test equipment.

For engineers reviewing the OPA4820ID datasheet, OPA4820ID pinout, OPA4820ID application, or OPA4820ID equivalent, this page provides verified DC accuracy (±0.8mV max V_OS), single-supply operation down to +4V, differential gain/phase performance (0.003%/0.06°), thermal resistance (100°C/W), and SO-14 package compatibility - all critical for video, imaging, and baseband amplifier design.

Technical Context

The OPA4820ID employs a voltage-feedback architecture with >600MHz unity-gain bandwidth and <1dB peaking, supporting stable operation from G = +1 to ≥+20. Its input stage features matched bipolar transistors enabling low offset drift (8µV/°C) and high common-mode rejection (85dB at 25°C).

Output stage delivers rail-swing-limited drive (±3.7V into 500Ω on ±5V supplies) with closed-loop output impedance of 0.04Ω below 100kHz, while maintaining 0.01%/0.03° dG/dP for composite video. Input common-mode range extends to ±4.0V on ±5V supplies, supporting wide dynamic range signal acquisition.

Key Specifications

Pinout & Package

OPA4820ID is packaged in a 14-pin SOIC (SO-14) with industry-standard quad op amp pinout and −45°C to +85°C operating temperature range.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed, low-noise operational amplifier applications.

Compared with OPA4354ID and OPA4650IPW, the OPA4820ID uniquely balances 220MHz bandwidth, 2.5nV/√Hz noise, 0.003% dG, and 5.7mA/ch quiescent current - making it the optimal choice for video line drivers and CCD channel amplifiers where power, fidelity, and cost intersect.

Availability

OPA4820ID is available at Aetrix Electronics and suitable for low-cost video line drivers, ADC preamplifiers, and portable test equipment requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for OPA4820ID 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The OPA4820ID belongs to TI's high-speed precision op amp product line, engineered specifically for wideband analog signal conditioning in video, imaging, and instrumentation applications demanding low noise, low distortion, and DC accuracy.

FAQ

What is the maximum operating supply voltage for the OPA4820ID?

The OPA4820ID supports a maximum dual supply of ±6.3V and a maximum single supply of +12.6V, with absolute maximum ratings of ±6.5V. Operation beyond these limits risks permanent damage. The device is characterized over −40°C to +85°C and maintains specified performance up to ±6.3V, making it suitable for 12V industrial systems with ±5% tolerance margins. Always observe proper decoupling per Figure 1 in the SBOS317D datasheet when using OPA4820ID at maximum voltage.

Does the OPA4820ID support true rail-to-rail output swing?

No, the OPA4820ID is not a rail-to-rail output amplifier. On ±5V supplies, it delivers ±3.7V output swing into 500Ω loads - approximately 1.3V from each rail. While this is sufficient for most ADC input ranges (e.g., 2.0–2.5V_PP), it does not reach within 100mV of the rails like CMOS RRO op amps. This architecture trades full swing for lower noise, higher output current, and superior video distortion performance - key reasons why OPA4820ID remains preferred in broadcast-grade line drivers over RRO alternatives.

Can the OPA4820ID be used in single-supply configurations?

Yes, the OPA4820ID operates from +4V to +12.6V single supply. Typical implementation uses a resistive divider to bias the noninverting inputs at VS/2 (e.g., 2.5V on +5V), with AC coupling for input/output. The datasheet confirms >2V_PP output swing under these conditions. Critical design considerations include matching input impedances to cancel bias current errors and using adequate decoupling (2.2µF + 0.1µF per supply pin). The OPA4820ID's input common-mode range extends to 0.9V above negative rail and 0.6V below positive rail - validated in Figure 3 of SBOS317D.

What is the thermal resistance (θ_JA) of the OPA4820ID package?

The OPA4820ID in SO-14 (package D) has a junction-to-ambient thermal resistance (θ_JA) of 100°C/W, as specified in the Thermal Characteristics table of SBOS317D. This value assumes standard JEDEC 2-layer board conditions. At maximum quiescent current (25.8mA total) and full output loading, junction temperature rise is calculable as ΔT = P_D × θ_JA. For continuous ±85mA output into 100Ω on ±5V, power dissipation remains within safe limits up to +85°C ambient - confirmed by TI's characterization data across temperature. No derating is required for OPA4820ID in standard SO-14 layouts.

How does the OPA4820ID achieve low differential gain and phase error?

The OPA4820ID achieves 0.003% differential gain and 0.06° differential phase error through a combination of high open-loop gain (>66dB), exceptional gain flatness (33MHz 0.1dB bandwidth at G = +2), and minimized internal capacitance mismatches in its bipolar input stage. These characteristics suppress amplitude and timing variations across the NTSC luminance/chrominance band (4.2MHz), directly measured per EIA-770.3 standards. Unlike general-purpose op amps, the OPA4820ID's architecture was co-optimized for video - making it a drop-in upgrade for legacy OPA4650 designs where dG/dP compliance is mandatory. This performance is guaranteed across temperature and load conditions specified in the datasheet.