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 SM7497 is a stereo Class AB audio power
amplifier that drives 3 W/channel of continuous
RMS power into a 16-Ω load. Advanced dc volume
control minimizes external components.TV and
monitor benefit from the integrated feature set that
minimizes external components without sacrificing
functionality.
FEATURES
* 32-step DC volume control
* Mute and shutdown mode
* Short circuit and thermal protection
* SE and BTL selector
* 3 W Into 16 -Ω Speakers
* Input MUX
* Depop circuitry
APPLICATIONS
PIN ASSIGNMENTS (TOP VIEW)
LLINEIN
PV
DD
LOUT+
GND
LOUT-
SHUTDOWN
BYPASS
4
5
6
9
8
7
1
2
3
12
11
10
V
DD
RLINEIN
ROUT+
GND
ROUT-
SE/BTL
VOLUME
* Small panel LCD TV
* LCD Monitors
* Portable DVD
* Mini speaker
* Digital broadcast system
SM7497
HDIP 12PIN
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V.0.1 Sep 11,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
PIN DESCRIPTIONS
No.
1
2
3
4
5
6
7
8
9
10
11
12
Pin name
LLINEIN
PV
DD
LOUT +
LOUT -
SHUTDOWN
BYPASS
VOLUME
SE/BTL
ROUT -
ROUT +
RLINEIN
V
DD
GND
I/O
I
-
O
O
I
I
I
I
O
O
I
-
-
Left channel input signal.
Supply voltage terminal for right power stage.
Left channel positive audio output.
Left channel negative 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.
Terminal for DC volume control. DC voltage range is 0V to 5V.
Output MUX control. When this terminal is high, SE outputs are
selected. When this terminal is low, BTL outputs are selected.
Right channel negative audio output.
Right channel positive audio output.
Right channel input signal.
Supply voltage terminal.
Power ground.
Function
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V.0.1 Sep 11,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
MAXIMUM RATINGS
(Ta = 40~85
o
C)
Characteristic
Supply Voltage
Input Voltage
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
DD
V
I
T
A
T
J
T
stg
-
Rating
-0.3 ~ 14.5
- 0.3 ~ V
DD
+0.3
- 40 ~ 85
- 40 ~150
- 65 ~150
260
Unit
V
V
o
o
o
o
C
C
C
C
RECOMMENDED OPERATING CONDITION
Characteristic
Supply Voltage
High-level input voltage
Low-level input voltage
Operating free-air temperature
Symbol
V
DD
V
IH
V
IL
T
A
Condition
--
SHUTDOWN , SE/BTL
SHUTDOWN , SE/BTL
--
Min.
9.0
4.0
0
- 40
Typ.
Max.
13.5
V
DD
0.8
85
Unit
V
V
V
o
C
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V.0.1 Sep 11,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
ELECTRICAL CHARACTERISTICS
(V
DD
=PV
DD
= 12V, Ta = 25
o
C unless otherwise noted)
Characteristic
Supply current
Shutdown current
Short to GND current limit
Output offset voltage
(measured differentially)
High-level input current
(SE/BTL,SHUTDOWN,)
Symbol
I
DD
I
SD
I
Short
V
OO
No load
Test Conditions
Min.
Typ.
25
1
1.1
Max.
40
20
Unit
mA
uA
A
SHUTDOWN=0V, SE/BTL=0V
V
IN
= 0V, R
L
= 900mΩ
Gain=20dB, SE/BTL=0V
50
1
mV
l
lH
V
l
= V
DD
= PV
DD
150
uA
Volume
Low-level input current
(SE/BTL,SHUTDOWN,VOLUME, )
l
lL
VI= 0V
6
1
uA
V
Bypass voltage (Nominally V
DD
/2)
V
(BYPASS)
Measured at pin 6,No load
(1)
OPERATING CHARACTERISTICS
(V
DD
=PV
DD
=12V, R
L
=16Ω, Gain = 6dB, Ta = 25
o
C unless otherwise noted)
Characteristic
Symbol
Test Conditions
THD+N=1%, f=1kHz,
R
L
=16Ω ,BTL mode , Gain=20dB
THD+N=10%, f=1kHz,
R
L
=16Ω ,BTL mode , Gain=20dB
THD+N=1%, f=1kHz,
R
L
=8Ω ,SE mode , Gain=14dB
THD+N=10%, f=1kHz,
R
L
=8Ω ,SE mode , Gain=14dB
Min.
Typ.
2.7
3.2
1.4
1.7
Max.
Unit
Output Power
(2)
P
O
W
High-level output voltage
Low-level output voltage
Supply current, max
Power into a 16
Ω
load
Total harmonic distortion+noise
Maximum output power bandwidth
Noise output voltage
(3)
V
OH
V
OL
I
DD
THD + N
B
OM
Measured between output and V
DD
Measured between output and GND
Output current PO=3W,
Stereo repetitive peak
P
O
=1W, f=1KHz, f=20Hz to 30kHz
BTL Mode
THD=5%
Gain = 0dB,C
(BYP)
=1.0 uf
600
400
1.5
0.1
> 20
36
mV
mV
A
RMS
%
kHz
μV
RMS
(1) At 9.0V < V
DD
< 13.5V the DC bypass voltage is approximately V
DD
/2
(2) Output power is measured at the output terminals of the IC.
(3) Noise voltage is measured in a bandwidth of 22Hz to 22KHz.
Page 4
V.0.1 Sep 11,2007
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