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 SM7512 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.
FEATURES
* Advanced DC Volume Control With 2-dB Steps
From -40 dB to 20 dB
- Maximum Volume Setting for SE Mode
- Adjustable SE Volume control
Referenced to BTL Volume Control
* 3 W Into 3-Ω Speakers
APPLICATIONS
* Notebook PC
* LCD Monitors
* Portable DVD Player
PIN ASSIGNMENTS (TOP VIEW)
* Digital photo frame
ROUT-
RPV
DD
RLINEIN
V
DD
LLINEIN
LPV
DD
LOUT-
LPGND
1
2
3
4
5
6
7
8
Thermal
Pad
16
15
14
13
12
11
10
9
RPGND
ROUT+
SE/BTL
VOLUME
GND
BYPASS
SHUTDOWN
LOUT+
SM7512
16PIN
Page 1
V.1.4 Revised May 28,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
PIN ASSIGNMENTS
ROUT-
RPV
DD
RLINEIN
V
DD
LLINEIN
LPV
DD
LOUT-
LPGND
1
2
3
4
5
6
7
8
Thermal
Pad
16
15
14
13
12
11
10
9
RPGND
ROUT+
SE/BTL
VOLUME
GND
BYPASS
SHUTDOWN
LOUT+
SM7512
16PIN
PIN DESCRIPTIONS
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
ROUT-
RPV
DD
RLINEIN
V
DD
LLINEIN
LPV
DD
LOUT-
LPGND
LOUT+
SHUTDOWN
BYPASS
GND
VOLUME
SE/BTL
ROUT+
RPGND
I/O
O
-
I
-
I
-
O
-
O
I
I
-
I
I
O
-
Function
Right channel negative audio output
Supply voltage terminal for power stage
Right channel line input
Supply voltage terminal
Left channel line input
Supply voltage terminal for power stage
Left channel negative audio output
Power ground
Left chanel positive audio output
Places the amplifier in shutdown mode if a TTL logic low is placed
on this terminal
Tap to voltage divider for internal midsupply bias generator used for
analog reference
Analog power supply ground
Terminal for dc volume control.DC voltage range is 0 to V
DD
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
Power ground
Page 2
V.1.4 Revised May 28,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
MAXIMUM RATINGS (Ta = 40~85
o
C)
Characteristic
Supply Voltage, V
DD
, PV
DD
Input Voltage
Operating free-air temperature range
Operaing junction temperature range
Storage temperatuer range
Continous total power dissipation
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
- 40 ~ 85
- 40 ~ 150
- 65 ~ 150
See Dissipation Rating Table
260
o
o
o
o
Unit
V
V
-
C
C
C
C
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
V
IH
V
IL
Low-level input voltage
V
IL
Operating free-air temperature
T
A
SHUTDOWN
--
SHUTDOWN
SE/BTL
Symbol
V
SS
V
IH
Condition
--
SE/BTL
Min.
4.0
0.8
V
DD
2.0
Typ.
Max.
5.5
Unit
V
V
-
-
-
-
-
-
-
-
0.3
V
DD
0.6
85
-
-
-40
V
o
C
Page 3
V.1.4 Revised May 28,2007
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,SHUTDOWN,VOLUME)
Low-level input
current(SE/BTL,SHUTDOWN,VOLUME)
Supply current, no load
Symbol
V
OO
PSRR
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
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
Min.
Typ.
Max.
60
Unit
mV
dB
uA
uA
-
-42
-
-70
-
1
1
10
6.0
-
-
5.5
3.0
-
-
8.0
5.0
1.5
1
l
DD
mA
Supply current,max power into a 3Ω load
Supply current,shutdown mode
l
DD
l
DD(SD)
-
-
-
20
A
RMS
uA
OPERATING CHARACTERISTICS
(V
DD
=PV
DD
= 5V, R
L
= 3Ω, Gain = 6dB, Ta = 25
o
C unless otherwise noted)
Characteristic
Symbol
Condition
f = 1KHz, R
L
=4Ω,
BTL Mode ,
Gain =20 dB
Output Power
(1)
P
O
f = 1KHz, R
L
=8Ω,
BTL Mode ,
Gain =20 dB
THD+N=1%
THD+N=10%
THD+N=1%
THD+N=10%
Min.
Typ.
1.9
2.3
1.4
1.7
3
< 0.6
Max.
Unit
-
-
-
-
-
-
-
-
2.65
-
-
-
-
-
-
600
400
2.85
W
V
DD
=5.5V, f = 1KHz, THD+N =10%
Total harmonic distortion+noise
High-level output voltage
Low-level output voltage
Bypass voltage(Nominally V
DD
/2)
(2)
Noise output voltage
THD+N
V
OH
V
OL
V
(BYPASS)
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 11,
No load, V
DD
=5.5V
f= 20 Hz to 20 kHz,
Gain=0 dB, C
(BYP)
= 1.0 uF
BTL
%
mV
mV
V
μV
RMS
-
-
2.75
85
-
-
(1) Output power is measured at the output terminals of the IC.
(2) At 4V < V
DD
< 5.5V the DC bypass voltage is approximately V
DD
/2
Page 4
V.1.4 Revised May 28,2007
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