Texas Instruments OPA615IDGSR

Overview

OPA615IDGSR from Texas Instruments is a high-speed, wideband operational transconductance amplifier (OTA) with integrated sampling comparator, designed for DC restoration, offset clamping, and nanosecond-pulse signal conditioning in video and data acquisition systems. It delivers 710MHz OTA bandwidth, 1.9ns comparator propagation delay, ±1μA input bias current, and 100dB sample-and-hold feedthrough rejection - enabling precise DC-level stabilization in broadcast HDTV and CCD image processing chains.

For engineers reviewing the OPA615IDGSR datasheet, OPA615IDGSR pinout, OPA615IDGSR application, or OPA615IDGSR equivalent, this device serves as a critical subsystem for high-fidelity analog signal integrity where sub-2ns timing precision, low charge injection (40fC), and dual-mode operation (standalone OTA or combined S/H) are required.

Technical Context

The OPA615IDGSR integrates two independent high-performance analog blocks: a self-biased bipolar OTA with cascode current-source output (710MHz small-signal BW, 72mA/V transconductance at 13mA IQ) and a TTL/CMOS-compatible sampling comparator (730MHz BW, 1.9ns signal delay, 2.5ns hold command delay). Both blocks share adjustable quiescent current via external RQ resistor, enabling trade-offs between bandwidth, power, and linearity.

Its architecture supports three OTA configurations - common-E (noninverting), common-C (buffer), and common-B (inverting) - each leveraging the high-impedance base input (±1μA bias), low-impedance emitter output, and high-Z collector current source output. The comparator features matched high-Z inputs and current-source output optimized for low offset and bias current, with feedthrough rejection >100dB below 20MHz in hold mode.

Key Specifications

Pinout & Package

OPA615IDGSR is housed in a 10-pin MSOP package (DGS) with exposed thermal pad. Pin functions are electrically validated per TI SBOS299E Rev. E and match the MSOP-10 pinout diagram in Figures 1–2 of the datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS3201DR and LMH6723MA, the OPA615IDGSR uniquely integrates a programmable OTA and sampling comparator in one die - enabling monolithic DC restoration, nanosecond pulse integration, and correlated double sampling without external timing ICs or layout-compromising discrete solutions.

Availability

OPA615IDGSR is available at Aetrix Electronics and suitable for broadcast video equipment, high-speed data acquisition systems, CAD monitor signal chains, and nanosecond pulse processing requiring stable component supply and long-term production continuity.

Supply support for OPA615IDGSR 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 precision analog design.

The OPA615IDGSR belongs to TI's high-speed analog portfolio, engineered specifically for DC-coupled wideband systems demanding sub-2ns timing, low charge injection, and flexible transconductance-based signal processing in broadcast, test, and imaging applications.

FAQ

What is the primary function of the OPA615IDGSR in a video signal chain?

The OPA615IDGSR serves as a complete DC restoration and offset clamping subsystem in video signal chains. Its integrated OTA and sampling comparator enable precise, wideband correction of black-level drift and low-frequency hum in HDTV and broadcast equipment. With 1.9ns comparator delay and 100dB feedthrough rejection, the OPA615IDGSR maintains signal fidelity across 1080p60 and UHD formats without introducing timing artifacts or hold-mode corruption.

How does the OPA615IDGSR achieve adjustable transconductance?

The OPA615IDGSR achieves adjustable transconductance through an external resistor (RQ) connected from Pin 1 (IQ Adjust) to −VCC. This resistor sets the quiescent current, which directly controls OTA transconductance: 300Ω yields 72mA/V, 2kΩ reduces it to 28mA/V. This allows designers to optimize bandwidth, power, and linearity trade-offs per application - for example, lowering IQ for battery-powered portable CCD imagers while retaining sufficient 230MHz large-signal BW.

Can the OPA615IDGSR be used without the sampling comparator?

Yes, the OPA615IDGSR can be used with only the OTA section active. Pins 8 (Base), 9 (Emitter), and 10 (Collector) operate independently of the comparator block (Pins 1–4, 6). Engineers routinely deploy the OTA as a high-linearity, current-output integrator or buffer in applications like laser diode drivers or precision current sources. The comparator remains unpowered if Hold Control (Pin 1) is held low, eliminating unnecessary current draw in pure OTA use cases.

What is the significance of the 40fC charge injection specification for the OPA615IDGSR?

The 40fC charge injection specification quantifies residual charge transferred to the CHOLD capacitor during track-to-hold switching. For a typical 100pF hold capacitor, this results in ≤0.4mV voltage error - critical for maintaining DC accuracy in 12-bit+ data acquisition systems. This low value stems from matched transistor sizing and cascode architecture in the comparator's output stage, making the OPA615IDGSR suitable for high-resolution CCD readout and precision sample-and-hold amplifiers where aperture uncertainty must be minimized.

Does the OPA615IDGSR support single-supply operation?

No, the OPA615IDGSR requires dual symmetric supplies (±4V to ±6.2V) and does not support true single-supply operation. Its internal bipolar OTA and comparator architectures depend on balanced positive/negative rails to achieve specified performance - including ±3.4V input voltage range, ±3.5V output compliance, and rail-to-rail common-mode rejection. Attempting single-supply use (e.g., 0V/10V) will violate absolute maximum ratings and cause functional failure or permanent damage.