SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
GENERAL DESCRIPTION
The SM7511 is a stereo audio power amplifier that
drives 3 W/channel of continuous RMS power into
a 3-Ω load. Advanced dc volume control minimizes
external components and allows BTL (speaker)
volume control and SE (headphone) volume
control. Notebook and pocket PCs benefit from the
integrated feature set that minimizes external
components without sacrificing functionality.
To simplify design, the speaker volume level is
adjusted by applying a dc voltage to the VOLUME
terminal. Likewise, the delta between speaker
volume and headphone volume can be adjusted by
applying a dc voltage to the SEDIFF terminal. To
avoid an unexpected high volume level through the
headphones, a third terminal, SEMAX, limits the
headphone volume level when a dc voltage is
applied. Finally, to ensure a smooth transition
between active and shutdown modes, a fade mode
ramps the volume up and down.
FEATURES
* Advanced DC Volume Control With 2-dB Steps
From -40 dB to 20 dB
- Fade Mode
- Maximum Volume Setting for SE Mode
- Adjustable SE Volume control
Referenced to BTL Volume Control
* 3 W Into 3 -Ω Speakers
* Stereo Input MUX
* Differential Inputs
APPLICATIONS
PIN ASSIGNMENTS (TOP VIEW)
* Notebook PC
* LCD Monitors
* Pocket PC
* Portable DVD
* Mini speaker
PGND
ROUT-
PV
DD
RHPIN
RLINEIN
RIN
V
DD
LIN
LLINEIN
LHPIN
PV
DD
LOUT-
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
ROUT+
SE/BTL
HP/LINE
VOLUME
SEDIFF
SEMAX
AGND
BYPASS
FADE
SHUTDOWN
LOUT+
PGND
Thermal
Pad
SM7511
24PIN
Page 1
V.1.3 Revised April 02,2007
SAMHOP [ SAMHOP MICROELECTRONICS CORP. ]
