三合微科股½有限公司
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
The information in this document is subject to change without notice.
c
SAMHOP Microelectronics Corp. All Rights Reserved.
台北縣新店市民權路100號7樓
7F,No.100,Min-Chyuan Road, Hsintien, Taipei Hsien, Taiwan, R.O.C.
TEL: 886-2-2218-3978/2820 FAX: 886-2-2218-3320
Email : info@samhop.com.tw
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 Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
PIN DESCRIPTIONS
No.
1.13
2
3.11
4
5
6
7
8
9
10
12
14
15
16
17
18
19
20
21
22
23
24
Pin Name
PGND
ROUT-
PV
DD
RHPIN
RLINEIN
RIN
V
DD
LIN
LLINEIN
LHPIN
LOUT-
LOUT+
SHUTDOWN
FADE
BYPASS
AGND
SEMAX
SEDIFF
VOLUME
HP/LINE
SE/BTL
ROUT+
I/O
-
O
-
I
I
I
-
I
I
I
O
O
I
I
I
-
I
I
I
I
I
O
Power ground
Right channel negative audio output
Supply voltage terminal for power stage
Right channel headphone input,selected when HP/LINE is held high
Right channel line input, selected when HP/LINE is held low
Common right channel input for fully defferential input. AC ground for
single-ended inputs.
Supply voltage terminal
Common left channel input for fully differential input. AC ground for
single-ended inputs.
Left channel line input, selected when HP/LINE is held low
Left channel headphone input,selected when HP/LINE is held high.
Left channel negative audio output
Left channel positive audio output.
Places the amplifier in shutdown mode if a TTL logic low is placed on
this terminal.
Places the amplifier in fade mode if a logic low is placed on this
termnal; normal operation if a logic high is placed on this terminal.
Tap to voltage divider for internal midsupply bias generator used for
analog reference.
Analog power supply ground
Sets the maximum volume for single ended operation.DC voltage
range is 0 to V
DD
Sets the difference between BTL volume and SE volme. DC voltage
range is 0 to V
DD
Terminal for dc volume control. DC voltage range is 0 to V
DD
Input MUX control. When logic high,RHPIN and LHPIN inputs are
selected. When logic low,RLINEIN and LLINEIN inputs are selected
Output MUX control. When this terminal is high,SE outputs are
selected.When this terminal is low, BTL outputs are selected
Right channel positive audio output.
Function
Page 2
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
MAXIMUM RATINGS (Ta = 40~85
o
C)
over operating free-air temperature range (unless otherwise noted)
Characteristic
Supply Voltage, V
DD
, PV
DD
Input Voltage
Continous total power dissipation
Operating free-air temperature range
Operaing junction temperature range
Storage temperature range
Lead temperature 1,6 mm (1/16 inch)
from case for 10 seconds
Symbol
V
SS
V
I
-
T
A
T
J
T
stg
-
Rating
-0.3 ~ 6
- 0.3 ~ V
DD
+0.3
See Dissipation Rating Table
- 40 ~ 85
- 40 ~ 150
- 65 ~ 150
260
o
o
o
o
Unit
V
V
-
C
C
C
C
(Note) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the
device. These are stress ratings only, and functional operation of the device at these or any other
conditions beyond those indicated under "recommend operating conditions" is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability.
DISSIPATION RATING TABLE
PACKAGE
SOP /SSOP
T
A
≤25°C
Power Rating
2.7mW
Derating Factor
Above T
A
=25°C
21.8 mW/°
C
T
A
=70°C
Power Rating
1.7W
T
A
=85°C
Power Rating
1.4W
RECOMMENDED OPERATING CONDITION
Characteristic
Supply Voltage, V
DD
, PV
DD
High-level input voltage
Symbol
V
SS
V
IH
SHUTDOWN
SE/BTL, HP/LINE, FADE
Low-level input voltage
V
IL
SHUTDOWN
Operating free-air temperature
T
A
--
-40
Condition
--
SE/BTL, HP/LINE, FADE
Min.
4.0
0.8
V
DD
2.0
0.6
V
DD
0.85
85
o
Typ.
Max.
5.5
Unit
V
V
V
C
Page 3
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
ELECTRICAL CHARACTERISTICS (V
DD
=PV
DD
= 5.5V, Ta = 25
o
C unless otherwise noted)
Characteristic
Output offset voltage (measured
differentially)
Power supply rejection ratio
High-level input current(SE/BTL,FADE
HP/LINE,SHUTDOWN,SEMAX)
High-level input current
(SEDIFF,VOLUME)
Low-level input current(SE/BTL,FADE
HP/LINE,SHUTDOWN,SEMAX)
Supply current, no load
Symbol
V
OO
PSRR
l
lH
l
lH
l
lL
Condition
V
DD
=5.5V,Gain=20dB, SE/BTL=0V
V
DD
=PV
DD
=4.0V to 5.5V
V
DD
=PV
DD
=5.5V,
V
l
=V
DD
=PV
DD
-42
-70
1
150
1
5.5
3.0
8.0
5.0
1.5
1
20
10
6.0
mA
Min.
Typ.
Max.
60
Unit
mV
dB
uA
uA
uA
V
DD
=PV
DD
=5.5V , V
l
=0V
V
DD
=PV
DD
=5.5V,SE/BTL=0V,
SHUTDOWN=2V
V
DD
=PV
DD
=5.5V,SE/BTL=5.5V,
SHUTDOWN=2V
V
DD
=5V=PV
DD
,SE/BTL=0V,
SHUTDOWN=2V,R
L
=3Ω,
P
O
=2W,Stereo
SHUTDOWN=0.0V
l
DD
Supply current,max power into a 3Ω load
Supply current,shutdown mode
l
DD
l
DD(SD)
A
RMS
uA
OPERATING CHARACTERISTICS
(V
DD
=PV
DD
= 5V, R
L
= 3Ω, Gain = 6dB, Ta = 25
o
C unless otherwise noted)
Characteristic
Output Power
Total harmonic distortion+noise
High-level output voltage
Low-level output voltage
Bypass voltage(Nominally V
DD
/2)
Maximum output power bandwidth
Supply ripple rejection ratio
Noise output voltage
Symbol
P
O
THD+N
V
OH
V
OL
V
(BYPASS)
B
OM
Condition
THD=1%, f=1 kHz
THD=10%, f=1 kHz, V
DD
=5.5V
P
O
=1W, R
L
=8Ω, f=20Hz to 20kHz
R
L
=8Ω,
Measured between output and V
DD
R
L
=8Ω,
Measured between output and GND
Measured at pin 17, No load,
V
DD
=5.5V
THD=5%
Min.
Typ.
2
3
<0.6
Max.
Unit
W
%
500
400
2.65
2.75
>20
2.85
mV
mV
V
kHz
dB
μV
RMS
f=1 kHz, Gain = 0 dB,
C
(BYP)
= 1.0uF
f= 20 Hz to 20 kHz, Gain=0
dB, C
(BYP)
= 1.0 uF
BTL
SE
BTL
-63
-57
40
Page 4
V.1.3 Revised April 02,2007
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