Product category: Power Supply ICs and Controllers
News Release from: Allegro MicroSystems Europe | Subject: A8285 and A8287
Edited by the Electronicstalk Editorial Team on 17 June 2003
Regulators power up
receiver low-noise blocks
The A8285 and A8287 are supply and control voltage regulators designed for use in the low-noise block section of analogue and digital satellite receivers, set-top boxes and internal satellite tuners
The new A8285 and A8287 integrated circuits from Allegro MicroSystems Europe are supply and control voltage regulators designed for use in the LNB (low-noise block) section of analogue and digital satellite receivers, set-top boxes and internal satellite tuners. The new monolithic devices provide the power and interface signals to the LNB down convertor via coaxial cable, and incorporate tracking switch-mode power convertors with integrated FETs for the lowest power dissipation.
This article was originally published on Electronicstalk on 17 June 2003 at 8.00am (UK)
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A two-wire bidirectional serial interface is incorporated which is compatible with the I2C standard operating at up to 400kHz.
A built-in tone oscillator is factory trimmed to 22kHz to facilitate DiSEqC 2.0 encoding, and the A8287 also features a 22kHz tone detector for DiSEqC decoding.
An auxiliary modulation input is also included.
Load current is up to 500mA, and 16 levels of LNB voltage are available for compatibility with all common standards.
Other features include LNB selection and standby function, overcurrent protection and diagnostics, and internal overtemperature protection.
The devices are supplied in plastic power SOIC packages with copper batwing tabs: 24-pin for the A8287 and 16-pin for the A8285.
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