Overview
The VCA824IDGST, produced by Texas Instruments, is a DC-coupled, ultra-wideband, linear-in V/V, continuously variable, voltage-controlled gain amplifier. This device is designed to provide a high degree of flexibility and precision in gain adjustment, making it suitable for a variety of high-performance applications. The VCA824 operates from ±5-V supplies and features a high-impedance gain control input that allows the gain to be adjusted linearly over a range of more than 40 dB. The internal architecture includes two input buffers and an output current feedback amplifier stage integrated with a multiplier core, eliminating the need for external buffering.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Small-Signal Bandwidth (G = 2 V/V) | 710 MHz | |
| Large-Signal Bandwidth (G = 10 V/V, 4-VPP) | 320 MHz | |
| Gain Flatness | 0.1 dB to 135 MHz | |
| Slew Rate | 2500 V/µs | |
| Gain Adjust Range | > 40 dB | |
| Gain Accuracy (20 dB) | ±0.3 dB | |
| Output Current | ±90 mA | |
| Supply Voltage | ±5 V | |
| Package Types | SOIC (14-pin), VSSOP (10-pin) | |
| Operating Temperature Range | –40°C to 85°C |
Key Features
- Ultra-wideband operation with high small-signal and large-signal bandwidths.
- Linear-in V/V gain control with a high-impedance gain control input.
- High gain accuracy and flatness over a wide frequency range.
- High slew rate and output current capability.
- Flexible gain setting using external resistors (RG and RF).
- Internal architecture includes input buffers and an output current feedback amplifier stage.
- Operates from ±5-V supplies with a wide operating temperature range.
Applications
- Differential Line Receivers
- Differential Equalizers
- Pulse Amplitude Compensation
- Variable Attenuators
- Voltage-Tunable Active Filters
Q & A
- What is the small-signal bandwidth of the VCA824 at a gain of 2 V/V?
The small-signal bandwidth of the VCA824 at a gain of 2 V/V is 710 MHz.
- What is the maximum gain adjust range of the VCA824?
The VCA824 has a gain adjust range of more than 40 dB.
- What is the slew rate of the VCA824?
The slew rate of the VCA824 is 2500 V/µs.
- What are the typical supply voltages for the VCA824?
The VCA824 operates from ±5-V supplies.
- What are the package types available for the VCA824?
The VCA824 is available in SOIC (14-pin) and VSSOP (10-pin) packages.
- What is the operating temperature range of the VCA824?
The operating temperature range of the VCA824 is –40°C to 85°C.
- How is the gain of the VCA824 controlled?
The gain of the VCA824 is controlled using a high-impedance gain control input and can be adjusted linearly in V/V.
- What are some common applications of the VCA824?
The VCA824 is commonly used in differential line receivers, differential equalizers, pulse amplitude compensation, variable attenuators, and voltage-tunable active filters.
- What is the maximum output current of the VCA824?
The maximum output current of the VCA824 is ±90 mA.
- Does the VCA824 require external buffering?
No, the VCA824 does not require external buffering due to its integrated internal architecture.
