Texas Instruments OPA615IDR

Overview

OPA615IDR from Texas Instruments is a high-speed, wide-bandwidth DC restoration and sample-and-hold subsystem integrating an operational transconductance amplifier (OTA) and a sampling comparator (SOTA) in a single SO-14 package. It delivers 710MHz OTA bandwidth, 730MHz comparator bandwidth, 1.9ns signal propagation delay, ±1μA input bias current, and 100dB feedthrough rejection - enabling precise nanosecond-scale clamping and offset correction in video and data acquisition signal chains.

For engineers reviewing the OPA615IDR datasheet, OPA615IDR pinout, OPA615IDR application, or OPA615IDR equivalent, this device serves as a complete analog front-end building block for broadcast-level DC restoration, high-speed S/H amplification, and low-hum signal conditioning where sub-2ns timing fidelity and <40fC charge injection are critical design requirements.

Technical Context

The OPA615IDR implements two co-integrated, independently usable analog cores: a self-biased bipolar OTA with cascode current-source output (72mA/V transconductance at 13mA IQ) and a matched-input sampling comparator with TTL/CMOS-compatible hold control. Both circuits share a common ±5V supply and temperature-stable PTAT biasing that maintains transconductance stability across –40°C to +85°C.

Its architecture enables three distinct operating modes: standalone OTA (common-E/B/C configurations), standalone SOTA (fast track/hold switching), or combined operation - e.g., SOTA-triggered OTA hold for correlated double sampling. Bandwidth, quiescent current (adjustable via external RQ), and gain are tunable through external resistors without altering core functionality.

Key Specifications

Pinout & Package

OPA615IDR is housed in a 14-pin SOIC (SO-14) surface-mount package with standard JEDEC MS-012AC footprint (5.3mm × 10.2mm, 1.27mm pitch). Pin 1 is IQ Adjust; pins 7 and 14 are NC; pin 13 is +VCC; pin 8 is −VCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DC restoration and sample-and-hold applications.

Compared with THS4302DR and AD8009ARZ, the OPA615IDR uniquely integrates both precision OTA and nanosecond-accurate SOTA in one die - eliminating inter-chip skew, reducing PCB area by >40%, and enabling single-supply timing-critical DC restoration without external logic or hold capacitors.

Availability

OPA615IDR is available at Aetrix Electronics and suitable for broadcast video equipment, high-speed data acquisition systems, and nanosecond pulse processing applications requiring stable component supply and long-term manufacturability.

Supply support for OPA615IDR 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 chain design and manufacturing.

The OPA615IDR belongs to TI's precision high-speed analog portfolio, engineered specifically for DC restoration, sample-and-hold, and nanosecond pulse conditioning in professional video, test equipment, and communications infrastructure.

FAQ

What is the primary function of the OPA615IDR in signal conditioning systems?

The OPA615IDR serves as an integrated DC restoration and sample-and-hold subsystem, combining a wideband operational transconductance amplifier (OTA) and a fast sampling comparator (SOTA) in one SO-14 package. Its core function is to precisely clamp analog signal baselines or capture instantaneous voltage values with sub-2ns timing accuracy - critical in broadcast video, high-speed data acquisition, and nanosecond pulse processing. The OPA615IDR achieves this without external timing logic or discrete hold components.

How does the IQ Adjust pin (Pin 1) affect OPA615IDR performance?

The IQ Adjust pin (Pin 1) connects to −VCC via an external resistor (RQ) to set the OPA615IDR's quiescent current, directly controlling OTA transconductance, bandwidth, and power consumption. With RQ = 300Ω, the OPA615IDR draws 13mA and delivers 710MHz OTA bandwidth; increasing RQ reduces IQ and bandwidth (e.g., 2kΩ yields 9.6mA and 28mA/V gm). This adjustment allows designers to optimize the OPA615IDR for specific speed-power trade-offs without changing layout or supply rails.

Can the OPA615IDR be used as a standalone operational amplifier?

Yes - the OPA615IDR's OTA section operates as a high-performance, voltage-controlled current source that can be configured as a common-emitter, common-base, or common-collector amplifier using external resistors. Unlike conventional op amps, it offers programmable transconductance, ±20mA output drive, and exceptional linearity (–62dBc 2nd-harmonic at 30MHz). However, it lacks internal feedback; stable closed-loop operation requires external compensation, typically via emitter degeneration (RE) and optional RC networks.

What is the significance of 40fC charge injection in OPA615IDR applications?

The OPA615IDR's 40fC charge injection determines hold-mode step error during track-to-hold transitions. When sampling a 1V signal onto a 40pF hold capacitor, this charge induces a 1mV error - well within 12-bit (≈2.4mV) and acceptable for 14-bit (≈610μV) systems with calibration. This low value enables accurate, repeatable sampling in high-resolution data acquisition, CCD readout, and pulse-height analysis where aperture uncertainty must be minimized without post-processing correction.

Does the OPA615IDR support single-supply operation?

No - the OPA615IDR requires dual ±4V to ±6.2V supplies (±5V nominal) for proper operation of both its OTA and SOTA sections. Its input common-mode range (±3.2V) and output compliance (±3.5V) are centered around ground, and the Hold Control pin is TTL/CMOS compatible but referenced to the same dual-rail system. Attempting single-supply use violates absolute maximum ratings and disables internal biasing, resulting in non-functional or damaged OPA615IDR units.