LM4811MM National Semiconductor, LM4811MM Datasheet - Page 11
![no-image](/images/manufacturer_photos/0/4/469/national_semiconductor_sml.jpg)
LM4811MM
Manufacturer Part Number
LM4811MM
Description
AUDIO POWER AMPLIFIER
Manufacturer
National Semiconductor
Type
Dual 150Mw Headphone Amplifierr
Datasheet
1.LM4811MM.pdf
(18 pages)
Specifications of LM4811MM
Amplifier Case Style
MSOP
No. Of Pins
8
Peak Reflow Compatible (260 C)
No
Supply Voltage Max
5V
Leaded Process Compatible
No
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LM4811MM
Manufacturer:
NSC
Quantity:
2 500
Part Number:
LM4811MM
Manufacturer:
NS/国半
Quantity:
20 000
Company:
Part Number:
LM4811MMX
Manufacturer:
SKYWORKS
Quantity:
5 000
Part Number:
LM4811MMX
Manufacturer:
NS/国半
Quantity:
20 000
Typical Performance Characteristics
Application Information
DIGITAL VOLUME CONTROL
The LM4811’s gain is controlled by the signals applied to the
CLOCK and UP/DN inputs. An external clock is required to
drive the CLOCK pin. At each rising edge of the clock signal,
the gain will either increase or decrease by a 3dB step
depending on the logic voltage level applied to the UP/DN
pin. A logic high voltage level applied to the UP/DN pin
causes the gain to increase by 3dB at each rising edge of the
clock signal. Conversely, a logic low voltage level applied to
the UP/DN pin causes the gain to decrease 3dB at each
rising edge of the clock signal. For both the CLOCK and
UP/DN inputs, the trigger point is 1.4V minimum for a logic
high level, and 0.4V maximum for a logic low level.
There are 16 discrete gain settings ranging from +12dB
maximum to −33dB minimum. Upon device power on, the
amplifier’s gain is set to a default value of 0dB. However,
when coming out of shutdown mode, the LM4811 will revert
back to its previous gain setting.
Power Supply Rejection Ratio
Frequency Response
20006150
20006136
11
(Continued)
The LM4811’s CLOCK and UP/DN pins should be de-
bounced in order to avoid unwanted state changes during
transitions between V
operation of the digital volume control. A microcontroller or
microprocessor output is recommended to drive the CLOCK
and UP/DN pins.
Power Supply Rejection Ratio
FIGURE 2. Timing Diagram
Supply Current vs
Supply Voltage
IL
and V
IH
. This will ensure correct
20006144
20006151
www.national.com
20006157