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) Ī50% 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
End of Windows XP boosted 1Q14 PC sales, says Gartner
April 15, 2014
The long-running decline of the desktop and notebook PC market, as consumers tend to buy and use lighter, more mobile, tablet ...
Global HB LED market set to shine by 2018
Chinese smartphone maker undercuts western companies
Materials interfaces pave way to solar cell gains
Quantum dot solar concentrator opens energy harvesting window
Samsung makes graphene at the wafer-scale
April 14, 2014
Samsung Advanced Institute of Technology (SAIT), in partnership with Sungkyunkwan University, has announced a method of synthesizing ...
Heartbleed challenges the Internet of Thing
Amazonís smartphone: a tracking tool in disguise
French team up to develop geo-location without GPS
- USB 5V 2.5A Output, 42V Input Synchronous Buck with Cable Drop Compensation
- Measurement applications across multiple test platforms
- Supplying DC input power to string inverters
- Supplying DC input power for HEV testing
InterviewHeartbleed challenges the Internet of Thing
The Heartbleed security bug is a key example of the fundamental security challenge for the Internet of Things says Green Hills Software as it launches a new security group.
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, Arrow Electronics is giving away ten XMC1200 lighting application kits, worth 100 Euros each, for EETimes Europe's readers to win.
Each kit combines Infineon’s brightness and colour control XMC1200 CPU board to drive flicker free LED dimming and colour changing, together with a colour LED card and a white LED card.
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.