Amplifier with voltage-controlled gain is high speed
20 October 2004Analogue, Mixed Signal, LSI
Products & Solutions
The VCA810 is a DC-coupled, wideband, continuously variable, voltage-controlled gain amplifier from Texas Instruments. It provides a differential input to single-ended output conversion with a high-impedance gain control input used to vary the gain over a -40 dB to +40 dB range linear in dB/V.
Operating from ±5 V supplies, the gain control voltage for the VCA810 will adjust the gain from -40 dB at 0 V input to +40 dB at -2 V input, says the manufacturer, while increasing the control voltage above ground will attenuate the signal path to >80 dB. Signal bandwidth and slew rate remain constant over the entire gain adjust range. This 40 dB/V gain control is linear to within ±0,5 dB, allowing the gain control voltage in an AGC application to be used as a received signal strength indicator (RSSI) with ±0,5 dB accuracy.
According to the manufacturer, excellent common-mode rejection and common-mode input range at the two high-impedance inputs allows this device to provide a differential receiver operation with gain adjust. The output signal is referenced to ground. Zero differential input voltage gives a 0 V output with a small DC offset error. Low input noise voltage ensures good output SNR at high gain settings. In applications where pulse edge information is critical, and the VCA810 is being used to equalise varying channel loss, minimal change in group delay over gain setting will retain good pulse edge information.
An improved output stage provides adequate output current to drive the most demanding loads, says TI. While principally intended to drive ADCs or second-stage amplifiers, the ±60 mA output current will easily drive doubly-terminated 50 Ω lines or a passive post filter stage over the ±1,7 V output voltage range.
For more information contact Les Bidgood, Arrow Altech Distribution, +27 (0)11 923 9600, [email protected]
NXP has expanded its MCX A Series Altron Arrow
AI & ML
NXP has significantly expanded its MCX A Series of Arm Cortex-M33 microcontrollers, doubling the portfolio with six new families aimed at industrial and IoT edge applications.
Read more...Exploring Bluetooth Channel Sounding Altron Arrow
Telecoms, Datacoms, Wireless, IoT
NXP has enabled BCS on the MCX W72 multi-protocol wireless MCU, which supports Bluetooth Low Energy 6.0, Thread, Zigbee, and Matter.
Read more...Dual-band Wi-Fi 6 companion module Altron Arrow
Telecoms, Datacoms, Wireless, IoT
The SimpleLink Wi-Fi CC33xx family of devices from Texas Instruments are dual-band Wi-Fi 6 companion modules enabling engineers to connect more applications with confidence.
Read more...High-performance linear regulator Altron Arrow
Power Electronics / Power Management
The TI TPS7A57-Q1 is an automotive-grade, high-performance low-dropout linear regulator, engineered for precision power delivery in noise-sensitive systems.
Read more...Quad RF ADC/DAC for wideband transceiver design Altron Arrow
DSP, Micros & Memory
The AD9084 from Analog Devices integrates a quad 16-bit RF digital-to-analogue converter with a maximum sampling rate of 28 GSPS and a quad 12-bit RF analogue-to-digital converter.
Read more...Collaboration to explore 10BASE-T1S SPE Altron Arrow
Telecoms, Datacoms, Wireless, IoT
The collaboration between Microchip and Hyundai aims to evaluate and promote the adoption of advanced in-vehicle network technologies leveraging each company’s strengths.
Read more...Bringing fire safety closer to home SafeQuip
Fire & Safety Products & Solutions Smart Home Automation
SafeQuip’s latest product launch introduces two compact, disposable fire extinguishers for everyday use, one suitable for Class A, B, and C fires, the other rated for Class A, B and F fires.
Read more...From surveillance to insight across Africa neaMetrics TRASSIR - neaMetrics Distribution
Access Control & Identity Management Surveillance Products & Solutions
TRASSIR is a global developer of intelligent video management and analytics solutions, delivering AI-driven platforms that enable organisations to monitor, analyse, and respond to events across complex physical environments.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version