Texas Instruments VCA810IDG4

Overview

VCA810IDG4 from Texas Instruments is a DC-coupled, wideband, ±60-mA output voltage-controlled gain amplifier (VGA) with differential input and single-ended output. It delivers ±40 dB gain adjust range linear in dB/V (–40 dB/V slope), 35 MHz small-signal bandwidth, 2.4 nV/√Hz input voltage noise, and operates from ±5-V supplies. It serves as time-gain control in optical receivers and pulse amplitude compensation in sonar systems.

For engineers reviewing the VCA810IDG4 datasheet, VCA810IDG4 pinout, VCA810IDG4 application, or VCA810IDG4 equivalent, key selection criteria include gain linearity (±0.3 dB), constant bandwidth vs gain, RSSI-capable gain control accuracy (±1.5 dB), low output DC error (< ±40 mV), and high output current (±60 mA) for driving ADCs or 50-Ω lines.

Technical Context

The VCA810IDG4 implements a transconductance-based analog multiplier architecture where gain is set by a high-impedance voltage-controlled current source feeding a fixed transimpedance stage. Its differential input stage provides >95 dB common-mode rejection at 25°C and supports ±2.4 V common-mode input range, enabling robust operation in noisy environments.

Gain control operates over –2 V to 0 V on pin 3 (VC), delivering precise –40 dB/V scaling with <3.5 dB total gain error across –40°C to 85°C. The 25 MHz gain control bandwidth ensures fast AGC loop response, while group delay variation remains ≤3.5 ns over frequency and gain settings - critical for pulse edge fidelity in sonar and LIDAR.

Key Specifications

Pinout & Package

The VCA810IDG4 is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with exposed pad not present. Pin 4 is NC (no connect); all other pins are electrically active and validated per TI SBOS275G datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage-controlled gain amplifier applications.

Compared with VCA810AIDR, VCA810IDG4 trades minor DC precision for cost efficiency while retaining identical AC performance; versus VCA2612, it prioritizes low-noise fidelity and simpler voltage-control interface over raw bandwidth and range.

Availability

VCA810IDG4 is available at Aetrix Electronics and suitable for optical receiver time gain control, sonar pulse conditioning, and AGC receiver designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for VCA810IDG4 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, embedded processing, and digital signal technologies for industrial, automotive, and communications markets.

The VCA810 product line delivers high-precision, wideband voltage-controlled amplifiers optimized for time-gain control, AGC, and RSSI functions in optical, ultrasonic, and RF receiver front-ends.

FAQ

What is the gain control voltage range for VCA810IDG4?

The VCA810IDG4 accepts a gain control voltage (VC) from –2 V to 0 V on pin 3, producing a linear-in-dB gain range from +40 dB to –40 dB. At VC = –2 V, gain is +40 dB; at VC = 0 V, gain is –40 dB. Voltages above +0.15 V disable the output. This –40 dB/V slope is specified with ±1.5 dB accuracy over –40°C to 85°C, making VCA810IDG4 suitable for RSSI applications.

Does VCA810IDG4 support differential input operation?

Yes, VCA810IDG4 features true differential inputs (pins 1 and 8) with >95 dB common-mode rejection ratio at 25°C and ±2.4 V common-mode input range. It operates in either differential-input/single-ended-output mode or single-ended-input mode (with one input grounded). The differential architecture enables high noise immunity and flexible termination - critical for VCA810IDG4 use in sonar and optical receivers where common-mode interference is prevalent.

What is the maximum output drive capability of VCA810IDG4?

VCA810IDG4 delivers ±60 mA output current into short-circuit conditions and sustains ±1.7 V output swing into a 100-Ω load at maximum gain. Its robust Class-AB output stage can directly drive doubly-terminated 50-Ω transmission lines or passive RC filter networks without external buffering - a key advantage for VCA810IDG4 integration in compact RF and IF signal chains where board space is constrained.

How does VCA810IDG4 maintain constant bandwidth across its gain range?

VCA810IDG4 uses a transconductance-based gain control architecture that decouples gain setting from frequency compensation. Its small-signal bandwidth remains constant at 35 MHz (typical) from –40 dB to +40 dB gain, verified across –40°C to 85°C. This eliminates gain-dependent peaking or roll-off, ensuring predictable pulse response and phase linearity - a critical feature for VCA810IDG4 deployment in time-of-flight and burst-mode communication systems.

Is VCA810IDG4 pin-compatible with earlier VCA610 devices?

Yes, VCA810IDG4 is a drop-in replacement for VCA610 with identical 8-pin SOIC footprint, pinout, and supply requirements (±5 V). It improves upon VCA610 with wider ±40 dB gain range (vs ±30 dB), better gain linearity (±0.3 dB vs ±1.0 dB), lower input noise (2.4 nV/√Hz vs 3.5 nV/√Hz), and enhanced output drive (±60 mA vs ±30 mA). No PCB changes are required when upgrading from VCA610 to VCA810IDG4.