Opto-Electronics


White LED driver integrates audio amplifier

11 July 2007 Opto-Electronics

Maxim has introduced the MAX8678, claiming it to be the industry's only white-LED (WLED) driver to combine a highly efficient negative charge pump with a fully differential, bridged audio amplifier.

Available in a tiny, 3 mm x 3 mm x 0,8 mm TQFN package, this single-chip solution is 50% smaller than the standard two-chip solution.

To achieve high efficiency, the MAX8678 features a negative architecture that completely eliminates high-side in-line resistance, delaying 1x to 2x mode transition during battery discharge. The independent adaptive-mode switching for each LED further extends battery life, even with large LED forward-voltage (Vf) mismatch. These innovative features enable the MAX8678 to be 12% more efficient than competing solutions according to the manufacturer, thus making it ideal for use in cellphones, smartphones, PDAs, and other handheld devices in which space and battery life are precious.

The audio amplifier accepts differential input signals and offers excellent noise immunity to improve audio reproduction. It also delivers 1,1 W to the speaker differentially through a bridge-tied-load (BTL) output stage. This provides up to four times more output power than a conventional, single-ended output stage, thus eliminating the need for output-coupling capacitors and further minimising external component count. The amplifier achieves 90 dB PSRR at 1 kHz and features a flexible, single-wire, serial pulse interface to realise gain settings from -9 dB to +18 dB in 3 dB steps, and it integrates click-and-pop suppression for rich, clean sound quality. It is fully specified for the extended temperature range of -40°C to +85°C.

For more information contact CST Electronics, +27 (0)11 608 0070, [email protected], www.cstelectronics.co.za



Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Enhanced breaker status and communication module
Schneider Electric South Africa Opto-Electronics
Schneider Electric has announced the launch of its new Breaker Status and Communication Module (BSCM) Modbus SL/ULP, which delivers enhanced performance, improved connectivity, and simplified integration for power distribution systems.

Read more...
Heat-resistant LEDs
Opto-Electronics
Würth Elektronik’s new RGB LEDs are characterised by excellent heat resistance with an insensitivity to temperatures from -40 to 100°C making them ideal solutions for reliable, colour-variable lighting in applications at high operating temperatures.

Read more...
Robust PoE module
CST Electronics Power Electronics / Power Management
The Ag59800-LPB high power, IEEE 802.3bt compliant, PD module from Silvertel offers typical efficiency of 95% making it an ideal choice for higher power, space-constrained applications.

Read more...
PhotoMOS relays
Future Electronics Opto-Electronics
The AQY221R2SX and AQY221R2S PhotoMOS from Panasonic Industry ensures excellent characteristics and high-speed switching performance.

Read more...
Mouser now shipping onsemi’s image sensors
TRX Electronics Opto-Electronics
The AR0145CS is a 1/4,3-inch CMOS digital image sensor with a 1280 (H) x 800 (V) active-pixel array that can capture both continuous video and single frames.

Read more...
Adaptive optics’ power solution
Altron Arrow Opto-Electronics
Vicor power-dense adaptive optical modules enable colossal telescopes to look into the past for deep space discoveries.

Read more...
Ultra-high speed photo detection
Opto-Electronics
TDK Corporation has announced a photo-spintronic conversion element combining optical, electronic, and magnetic elements that can respond at an ultra-high speed of 20 picoseconds.

Read more...
High-speed lasers
RFiber Solutions Opto-Electronics
Macom are a high-volume manufacturer of lasers, deploying more than 100 million devices with a reliability of less than 50 FIT and greater than 100 years of wear-out lifetime

Read more...
High-performance optical interconnect
Opto-Electronics
STMicroelectronics has unveiled its next generation of proprietary technologies for higher-performing optical interconnect in datacentres and AI clusters.

Read more...
Halo mid-board optical transceiver
Spectrum Concepts Opto-Electronics
The Samtec Halo mid-board transceiver has been designed for next-generation embedded applications that require 56 and 112 Gbps PAM4 performance in low profile and ruggedised form factors.

Read more...









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.




© Technews Publishing (Pty) Ltd | All Rights Reserved