LM4985TM

• Octopus card or capacitively coupled output (patent pending)
• I 2 C digital control volume control
• Space-saving 0.4 mm resulting in a micro SMD package
• Volume control range: 76 dB to 18 dB
• Ultra-low current shutdown mode
• 2.3V - 5.5V operation
• Ultra-low noise

illustrate

The LM4985 is an internal digitally controlled volume-controlled stereo audio power amplifier. The amplifier is capable of delivering RMS to 16 RMS of 68mW per channel load or RMS of 38mW per channel to 32 At 1% THD load, a 3.6V power supply and capacitor mode operate for power supply.

Boomer audio power amplifiers are designed to provide high-quality output power with very few external components. To this end, the LM4985 has two features that optimize system cost and minimize PCB area: an integrated digital control (I 2 C bus), volume control, and operating mode, eliminating output signal coupling capacitors (OCL mode). Since the LM4985 does not require bootstrap capacitors, buffer networks, or output-coupled capacitors, it is the best choice for low-power, battery-powered, portable systems. For added design flexibility, the LM4985 can also be configured as a single-ended capacitively coupled output.

The LM4985 current shutdown mode provides micropower and thermal shutdown protection.

Key specifications:

PSRR: 217Hz and 1kHz
Output Capacitors (OCLs).
f ripple = 217Hz	77 dB (typical)
f Ripple = 1kHz	76 dB (typical)
Capacitive Coupling (C University of Political Science and Law)
f ripple = 217Hz	63 dB (typical)
f Ripple = 1kHz	62 dB (typical)
Output power per channel (THD + N = 1% at F IN = 1 kHz), R L = 16 , Octopus card
V DD = 2.5V	31mW (typical)
V DD = 3.6V	68mW (typical)
V DD = 5.0V	135MW (typical)
(THD + N f = 1kHz)
R LOAD = 16 Octopus card, P OUT = 60MW	0.60
R LOAD = 32 Octopus card, P OUT = 33mW	0.031
Turn off the current	0.1μA (typical)

apply

• mobile phone
• handheld computer
• Portable electronic devices
• MP3 player