Texas Instruments VCA824IDGSR

Overview

VCA824IDGSR from Texas Instruments is a DC-coupled, ultra-wideband, linear-in-V/V voltage-controlled gain amplifier (VGA) with differential input and single-ended output. It delivers 710-MHz small-signal bandwidth at G = 2 V/V, 320-MHz large-signal bandwidth at G = 10 V/V, 0.1-dB gain flatness to 135 MHz, 2500-V/µs slew rate, and >40-dB gain adjust range - enabling precise amplitude control in high-speed video equalization and pulse compensation circuits.

For engineers reviewing the VCA824IDGSR datasheet, VCA824IDGSR pinout, VCA824IDGSR application, or VCA824IDGSR equivalent, key selection criteria include its gain linearity (±0.3 dB at 20-dB max gain), ±90-mA output current drive capability, ±5-V dual supply operation, 10-pin VSSOP package footprint, and differential-to-single-ended conversion without external buffering.

Technical Context

The VCA824IDGSR integrates two input buffers and a current-feedback output amplifier with an internal multiplier core, forming a complete VGA system. Its gain is set externally via RG+ and RG– pins, allowing flexible maximum gain configuration between 2 V/V and 40 V/V. Gain control is linear in V/V across VG = –1 V to +1 V, with high-impedance control input (1.5 MΩ || 0.6 pF).

It operates from ±4 V to ±6 V supplies, supports DC-coupled signal paths, and maintains stable performance over –40°C to +85°C. The architecture enables direct differential line reception and RC load equalization without additional active components, as validated by its 135-MHz 0.1-dB flatness and low group delay variation (<0.6 ns over 100 MHz at AVMAX = 10 V/V).

Key Specifications

Pinout & Package

The VCA824IDGSR is packaged in a 10-pin VSSOP (DGS) package measuring 3.00 mm × 3.00 mm, optimized for space-constrained high-frequency PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar variable gain amplifier applications.

Compared with VCA824IDGSR, the VCA822IDR offers identical gain performance in larger SOIC packaging and reduced output drive, while the VCA821IDR trades differential input and wide gain range for higher bandwidth in single-ended configurations - making VCA824IDGSR uniquely suited for compact, high-fidelity differential signal conditioning.

Availability

VCA824IDGSR is available at Aetrix Electronics and suitable for differential line receivers, high-speed video equalizers, and pulse amplitude compensation systems requiring stable component supply, consistent parametric performance, and long-term production availability.

Supply support for VCA824IDGSR 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 company specializing in analog and embedded processing technologies, with leadership in high-performance signal chain products.

The VCA824IDGSR belongs to TI's ultra-wideband variable gain amplifier product line, designed specifically for high-fidelity analog signal conditioning in video, test equipment, and communications infrastructure where DC coupling, linear gain control, and wide bandwidth are essential.

FAQ

What is the maximum operating supply voltage for the VCA824IDGSR?

The VCA824IDGSR supports a maximum operating supply voltage of ±6 V, with recommended operation at ±5 V. Absolute maximum ratings specify ±6.5 V for the power supply rails. Operation beyond ±6 V risks permanent damage, and thermal derating is required above ambient temperatures where junction temperature exceeds 140°C. The device draws 36.5–38.5 mA quiescent current at ±5 V, making it suitable for tightly regulated dual-rail systems. VCA824IDGSR maintains specified AC performance across this voltage range.

Does the VCA824IDGSR support true differential input operation?

Yes, the VCA824IDGSR features fully differential inputs (+VIN and –VIN) with 80-dB common-mode rejection ratio at 25°C. It accepts DC-coupled differential signals with a common-mode input range of –2.1 V to +1.6 V when powered from ±5 V. This architecture enables direct connection to differential sources such as LVDS or RS-422 receivers without level-shifting or termination resistors. VCA824IDGSR's differential input stage contributes to its low harmonic distortion (–64 dBc 2nd-harmonic at 20 MHz) and high PSRR (–68 dB).

How is gain configured on the VCA824IDGSR?

Gain on the VCA824IDGSR is configured in two stages: maximum gain is set externally using precision resistors connected to +RG and –RG pins (typically 2–40 V/V), while actual gain is controlled linearly in V/V via the VG pin (–1 V to +1 V). For example, with AVMAX = 10 V/V, VG = +1 V yields 10 V/V, and VG = –1 V yields ~0.1 V/V. Gain error is ±0.4 dB maximum at 25°C. VCA824IDGSR's gain control input has 1.5-MΩ impedance and 30-µA bias current, requiring low-impedance drive for optimal linearity.

What package type is used for the VCA824IDGSR?

The VCA824IDGSR is supplied in a 10-pin VSSOP (DGS) package with nominal body dimensions of 3.00 mm × 3.00 mm and 0.5-mm lead pitch. This thermally enhanced, surface-mount package supports high-density layout and provides RθJA = 173.1°C/W. It is distinct from the SOIC-14 (D) variant of the same family. The VSSOP footprint enables compact placement near high-speed connectors or ADCs, and its exposed pad variant (not applicable here) would further improve thermal performance. VCA824IDGSR's pinout is optimized for signal integrity in RF and video routing.

Can the VCA824IDGSR drive a 100-Ω load effectively?

Yes, the VCA824IDGSR delivers ±90 mA output current and sustains a 3.6-VPP output swing into a 100-Ω load at ±5 V supplies, meeting broadcast video and high-speed data line driver requirements. Its output stage uses current-feedback architecture for fast settling (11 ns to 0.01%) and low output impedance (0.01 Ω). When driving 100-Ω loads, harmonic distortion remains –64 dBc (2nd) and –61 dBc (3rd) at 20 MHz. Layout best practices - including short traces, local decoupling, and proper grounding - are essential to preserve this performance. VCA824IDGSR's robust drive capability eliminates need for external buffer stages.