48-channel PWM generator with 12-bit resolution dynamically controls LEDs or provides 48 DAC outputs
August 01, 2011 // Paul Buckley
Linear Technology has released a pulse width modulation (PWM) generator with 48 independent channels. Each channel has an individually adjustable 12-bit (4,096 steps) PWM register and a 6-bit (64 step) ±50% correction register. All controls are programmable via a simple TTL/CMOS 50 MHz serial data interface.
The LT8500 can be used in a wide variety of PWM-intensive applications such as LED control, as well as industrial and robotic applications. For example, the LT8500 can be used with three LT3595As, 16-channel LED drivers, to deliver 48-independently dimmed LED strings for locally dimmed LED backlighting for large LCD displays. The correction resister allows matching light output of each LED string.
The LT8500 operates from a 3 V to 5.5 V input range, enabling it to operate from a wide range of standard power buses. For LED applications, each channel has individual 6-bit dot correction current adjustment and 12-bit gray scale PWM dimming. The 40 ns on-time of the LT8500 offers wide dynamic contrast ratios. Both correction and gray scale dimming are accessible via a serial interface in TTL/CMOS logic.
The LT8500 offers two diagnostic information flags: synchronization error and open LED. The flags are sent with additional state information, on the serial data interface during status read back. The 50 MHz cascadable serial data interface includes buffering and skew-balancing, easing the design for PWM-intensive applications such as large screen LCD dynamic backlighting. The combination of minimal externals and a 5 mm x 9 mm QFN package provide a highly compact solution footprint for multichannel PWM applications.
The LT8500EUHH is available in a 56-lead 5 mm x 9 mm QFN package, priced starting at $2.95 each, in 1,000-piece quantities. The extended temperature version, the LT8500IUHH, or I-grade, is also available, priced starting at $3.25 each in 1,000-piece quantities. All versions are available from stock.
More information about the LT8500 PWM generator at
3D Sound Labs cracks user-centric surround sound
April 27, 2015
French startup 3D Sound Labs is now taking pre-orders for its Neoh headphones which it claims produce a truly immersive, ...
Carbon-nanotube sensor detects rotting meat
Wireless charging gets universal antenna
European Space Agency to send ultracapacitors into orbit
A clean MIPS slate for academia
Design win; IDT meets IKEA
April 24, 2015
Integrated Device Technology, Inc. (IDT) has disclosed that IKEA has chosen IDT’s wireless power transmitters to embed in ...
Eurotech to offload its cloud offering to iNebula
Electric vehicles: Driving range decides
Samsung details its flex display
- Smart Capacitive Design Tips
- Wireless MCUs and IoT
- Battery Management System Tutorial
- Deciding if Automated Test is right for your Company
InterviewInfineon: CAN FD success goes at the expense of FlexRay
The faster version of the venerable CAN bus, CAN FD is currently taking off at several carmakers. Infineon's Thomas Böhm, Head of Body / Automotive, believes this could well go at the expense of FlexRay. ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, DecaWave is offering EETimes Europe's readers the chance to win two TREK1000 kits to evaluate its Ultra-Wideband (UWB) indoor location and communication DW1000 chip in different real-time location system topologies.
Worth €947, the kit allow designers to prove a concept within hours and have a prototype ready in days. Based on the two-way ranging scheme, the kit lets you test...MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.