- 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
|