LM4970 Datasheet, PDF (1/19 Pages) National Semiconductor (TI) – Audio Synchronized Color LED Driver

LM4970
www.ti.com
SNVS312D – JANUARY 2005 – REVISED MAY 2013
LM4970
Audio Synchronized Color LED Driver
Check for Samples: LM4970
FEATURES
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•2 Audio Synchronized Color LED Driver
• User Defined LED Pattern, Color, and Intensity
Capability
• Programmable:
– LED Drive Current
– PWM Frequency
– High Pass Filter Frequency Select
– Audio Input Signal Gain
• Eliminates External LED Current Limiting
Resistors
• I²C Compatible Interface
• Ultra Low Shutdown Current
APPLICATIONS
• Cell Phones
• Portable MP3, CD, DVD, AAC players
• PDA's
KEY SPECIFICATIONS
• LED Drive Current per Channel (V_DD = 5V):
42mA (2X Setting)
• Shutdown Current, V_DD = 5V: 1.5μA (Typ)
DESCRIPTION
The LM4970 is a LED driver with an audio
synchronization mode that virtually eliminates the
need for real time software processing for LED
lighting effects. The LM4970 includes three individual
PWM color LED drivers that provide up to 42mA of
current drive for each PWM LED output.
The LM4970 features an audio synchronization mode
where the audio input signal that is mixed in from
three audio inputs is filtered into three frequency
bands, with each frequency band assigned to a
specific PWM LED driver.
The PWM LED drivers can also be directly
programmed through an I²C compatible interface for
applications where user defined LED pattern, color,
and intensity programmability is a priority.
The LM4970 also features an audio input gain control
which allows the user to increase the gain if the audio
input signal does not create a bright enough effect on
the LEDs. The LM4970 is a feature rich LED driver
that is available in a space saving 14 pin non-
pullback WSON package.
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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