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]
Vivotek partners to enhance retail management
Surveillance Retail (Industry) Products & Solutions AI & Data Analytics
Recognising the growing demand from retail enterprises to boost operational efficiency through cloud security solutions, Vivotek has announced a partnership between its AI-powered cloud surveillance platform, Vortex, and Kabob.
Read more...Highest capacity ePMR HDDs
Infrastructure Products & Solutions
Western Digital has announced that it is now shipping the world’s highest capacity UltraSMR HDD with up to 32TB leveraging the time-tested, reliable energy-assisted PMR (ePMR) recording technology for hyperscalers, CSPs and enterprises.
Read more...Scalable, secure user and IoT onboarding and management Duxbury Networking
IoT & Automation Products & Solutions
With growing demands for connected devices across various sectors in South Africa, EasyPass simplifies network management by automating the onboarding of multiple user devices and IoT connections.
Read more...Protect your assets with Visual Verifier Secutel Technologies
Surveillance Products & Solutions
To ensure your valuable assets and secured areas remain protected during this high-risk time, Secutel offers the Visual Verifier (VV) – a solution delivering comprehensive security and peace of mind.
Read more...Dallmeier launches new entry-level camera Dallmeier Electronic Southern Africa
Surveillance Products & Solutions
Dallmeier electronic is expanding its product portfolio with the Picoline, an entry-level camera that offers a compact and cost-effective solution for applications that require day and night recording with the highest resolution (IR mode).
Read more...Ryzen-based computer on module Altron Arrow
AI & ML
SolidRun announced the launch of its new Ryzen V3000 CX7 Com module, configurable with the eight-core/16-thread Ryzen Embedded V3C48 processor.
Read more...Robust and customisable SBC Altron Arrow
DSP, Micros & Memory
Pairing the powerful i.MX8M Plus System on Module (SoM) from SolidRun, which features the i.MX 8M Plus SoC from NXP, this high-performance SBC is set to transform industrial environments.
Read more...New family supports future cryptography Altron Arrow
DSP, Micros & Memory
NXP has introduced its new i.MX 94 family, which contains an i.MX MPU with an integrated time-sensitive networking (TSN) switch, enabling configurable, secure communications with rich protocol support in industrial and automotive environments.
Read more...NXP’s all-purpose microcontroller series Altron Arrow
DSP, Micros & Memory
NXP has released its MCX A14x and A15x series of all-purpose microcontrollers which are part of the larger MCX portfolio that shares a common Arm Cortex-M33 core platform.
Read more...Non-terrestrial network module Altron Arrow
Telecoms, Datacoms, Wireless, IoT
Fibocom unveiled its MA510-GL (NTN), a non-terrestrial networks module which is compliant with 3GPP Release 17 standard.
printer friendly version