SAMHOP Microelectronics Corp. 三合微科股份有限公司

三合微科股份有限公司
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 : [email protected]
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
GENERAL DESCRIPTION
FEATURES
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.
* Advanced DC Volume Control With 2-dB Steps
From -40 dB to 20 dB
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.
* 3 W Into 3 -Ω Speakers
APPLICATIONS
PIN ASSIGNMENTS (TOP VIEW)
- Fade Mode
- Maximum Volume Setting for SE Mode
- Adjustable SE Volume control
Referenced to BTL Volume Control
* Stereo Input MUX
* Differential Inputs
* Notebook PC
* LCD Monitors
* Pocket PC
* Portable DVD
* Mini speaker
PGND
ROUTPVDD
RHPIN
RLINEIN
RIN
VDD
LIN
LLINEIN
LHPIN
PVDD
LOUT-
1
2
3
4
5
6
7
8
9
10
11
12
Thermal
Pad
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
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.
Pin Name
I/O
1.13
PGND
-
Power ground
2
ROUT-
O
Right channel negative audio output
3.11
PVDD
-
Supply voltage terminal for power stage
4
RHPIN
I
Right channel headphone input,selected when HP/LINE is held high
5
RLINEIN
I
Right channel line input, selected when HP/LINE is held low
6
RIN
I
Common right channel input for fully defferential input. AC ground for
single-ended inputs.
7
VDD
-
Supply voltage terminal
8
LIN
I
Common left channel input for fully differential input. AC ground for
single-ended inputs.
9
LLINEIN
I
Left channel line input, selected when HP/LINE is held low
10
LHPIN
I
Left channel headphone input,selected when HP/LINE is held high.
12
LOUT-
O
Left channel negative audio output
14
LOUT+
O
Left channel positive audio output.
15
SHUTDOWN
I
16
FADE
I
17
BYPASS
I
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.
18
AGND
-
Analog power supply ground
19
SEMAX
I
20
SEDIFF
I
Sets the maximum volume for single ended operation.DC voltage
range is 0 to VDD
Sets the difference between BTL volume and SE volme. DC voltage
range is 0 to VDD
21
VOLUME
I
Terminal for dc volume control. DC voltage range is 0 to VDD
22
HP/LINE
I
Input MUX control. When logic high,RHPIN and LHPIN inputs are
selected. When logic low,RLINEIN and LLINEIN inputs are selected
23
SE/BTL
I
Output MUX control. When this terminal is high,SE outputs are
selected.When this terminal is low, BTL outputs are selected
24
ROUT+
O
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 = 40~85oC)
over operating free-air temperature range (unless otherwise noted)
Characteristic
Symbol
Rating
Unit
VSS
-0.3 ~ 6
V
VI
- 0.3 ~ VDD +0.3
V
Supply Voltage, VDD, PVDD
Input Voltage
Continous total power dissipation
-
See Dissipation Rating Table
Operating free-air temperature range
TA
- 40 ~ 85
o
C
Operaing junction temperature range
TJ
- 40 ~ 150
o
C
Tstg
- 65 ~ 150
o
C
-
260
o
C
Storage temperature range
Lead temperature 1,6 mm (1/16 inch)
from case for 10 seconds
-
(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
TA≤25°C
Power Rating
Derating Factor
Above TA=25°C
TA=70°C
Power Rating
TA=85°C
Power Rating
SOP /SSOP
2.7mW
21.8 mW/°C
1.7W
1.4W
RECOMMENDED OPERATING CONDITION
Characteristic
Supply Voltage, VDD, PVDD
High-level input voltage
Low-level input voltage
Operating free-air temperature
Symbol
Condition
Min.
VSS
--
4.0
SE/BTL, HP/LINE, FADE
0.8
VDD
SHUTDOWN
2.0
VIH
Max.
Unit
5.5
V
V
SE/BTL, HP/LINE, FADE
0.6
VDD
SHUTDOWN
0.85
VIL
TA
Typ.
--
Page 3
-40
85
V
o
C
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
ELECTRICAL CHARACTERISTICS (VDD =PVDD = 5.5V, Ta = 25oC unless otherwise noted)
Characteristic
Symbol
Condition
VOO
VDD=5.5V,Gain=20dB, SE/BTL=0V
Output offset voltage (measured
differentially)
Power supply rejection ratio
PSRR
High-level input current(SE/BTL,FADE
HP/LINE,SHUTDOWN,SEMAX)
High-level input current
(SEDIFF,VOLUME)
llH
llL
Supply current, no load
lDD
Supply current,max power into a 3Ω load
lDD
Supply current,shutdown mode
VDD=PVDD=4.0V to 5.5V
-42
Typ.
VDD=PVDD=5.5V , Vl=0V
VDD=PVDD=5.5V,SE/BTL=0V,
SHUTDOWN=2V
VDD=PVDD=5.5V,SE/BTL=5.5V,
SHUTDOWN=2V
VDD=5V=PVDD,SE/BTL=0V,
SHUTDOWN=2V,RL=3Ω,
PO=2W,Stereo
lDD(SD)
Max.
Unit
60
mV
-70
VDD=PVDD=5.5V,
Vl=VDD=PVDD
llH
Low-level input current(SE/BTL,FADE
HP/LINE,SHUTDOWN,SEMAX)
Min.
dB
1
uA
150
uA
1
uA
5.5
8.0
10
3.0
5.0
6.0
1.5
SHUTDOWN=0.0V
1
mA
ARMS
20
uA
Max.
Unit
OPERATING CHARACTERISTICS
(VDD =PVDD = 5V, RL = 3Ω, Gain = 6dB, Ta = 25oC unless otherwise noted)
Characteristic
Output Power
Total harmonic distortion+noise
Symbol
PO
THD+N
High-level output voltage
VOH
Low-level output voltage
VOL
Bypass voltage(Nominally VDD/2)
V(BYPASS)
Maximum output power bandwidth
BOM
Condition
Min.
Typ.
THD=1%, f=1 kHz
2
THD=10%, f=1 kHz, VDD=5.5V
3
PO =1W, RL=8Ω, f=20Hz to 20kHz
<0.6
RL=8Ω,
Measured between output and VDD
RL=8Ω,
Measured between output and GND
Measured at pin 17, No load,
VDD=5.5V
f=1 kHz, Gain = 0 dB,
C(BYP) = 1.0uF
Noise output voltage
f= 20 Hz to 20 kHz, Gain=0
dB, C(BYP)= 1.0 uF
Page 4
2.65
2.75
>20
THD=5%
Supply ripple rejection ratio
W
BTL
-63
SE
-57
BTL
40
%
500
mV
400
mV
2.85
V
kHz
dB
μVRMS
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
FUNCTIONAL BLOCK DIAGRAM
RHPIN
RLINEIN
RIN
R
MUX
_
HP/LINE
_
+
ROUT+
+
BYP
+
_
BYP
_
ROUT-
+
EN
BYP
SE/BTL
SE/BTL
HP/LINE
MUX
Control
Power
Management
VOLUME
32-Step
Volume
Control
SEDIFF
SEMAX
FADE
LHPIN
LLINEIN
PVDD
L
MUX
BYPASS
SHUTDOWN
AGND
_
_
+
LIN
PGND
VDD
LOUT+
+
HP/LINE
BYP
+
_
BYP
_
+
LOUTEN
BYP
SE/BTL
NOTE: All resistor wipers are adjusted with 32 step volume control.
Page 5
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
Table 1. DC Volume Control (BTL Mode, VDD=5V)
VOLUME (PIN 21)
FROM (V)
TO (V)
GAIN OF AMPLIFIER
(Typ.)
0.00
0.23
-85
0.31
0.34
-40
0.42
0.46
-38
0.54
0.56
-36
0.65
0.67
-34
0.76
0.79
-32
0.87
0.90
-30
0.98
1.01
-28
1.10
1.12
-26
1.21
1.24
-24
1.32
1.35
-22
1.43
1.46
-20
1.54
1.57
-18
1.66
1.68
-16
1.77
1.79
-14
1.88
1.91
-12
1.99
2.02
-10
2.10
2.13
-8
2.21
2.24
-6
2.33
2.35
-4
2.44
2.47
-2
2.55
2.57
0
2.67
2.70
2
2.77
2.80
4
2.89
2.92
6
3.00
3.03
8
3.11
3.14
10
3.22
3.26
12
3.33
3.37
14
3.44
3.48
16
3.55
3.60
18
3.67
5.00
20
Page 6
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
Table 2. DC Volume Control (SE Mode, VDD=5V)
SE_VOLUME=VOLUME-SEDIFF or SEMAX
FROM (V)
TO (V)
GAIN OF AMPLIFIER
(Typ.)
0.00
0.23
-85
0.31
0.34
-46
0.42
0.46
-44
0.54
0.56
-42
0.65
0.67
-40
0.76
0.79
-38
0.87
0.90
-36
0.98
1.01
-34
1.10
1.12
-32
1.21
1.24
-30
1.32
1.35
-28
1.43
1.46
-26
1.54
1.57
-24
1.66
1.68
-22
1.77
1.79
-20
1.88
1.91
-18
1.99
2.02
-16
2.10
2.13
-14
2.21
2.24
-12
2.33
2.35
-10
2.44
2.47
-8
2.55
2.57
-6
2.67
2.70
-4
2.77
2.80
-2
2.89
2.92
0
3.00
3.03
2
3.11
3.14
4
3.22
3.26
6
3.33
3.37
8
3.44
3.48
10
3.55
3.60
12
3.67
5.00
14
Page 7
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
APPLICATION INFORMATION
The figure is schematic diagrams of typical notebook computer application circuits.
Right
Speaker
1
Cs
2
3
Power Supply
Right HP
Audio Source
Ci
4
Ci
Right Line
Audio Source
5
Ci
6
VDD
Cs
Ci
Left Line
Audio Source
Left HP
Audio Source
Ci
8
9
10
11
Power Supply
Cs
SE/BTL
ROUTPVDD
RHPIN
HP/LINE
VOLUME
RLINEIN
SEDIFF
RIN
SEMAX
VDD
24
23
Cc
100kΩ
100kΩ
22
1kΩ
21
20
19
In From DAC
or
Potentiometer
(DC Voltage)
Headphones
7
Ci
ROUT+
PGND
12
VDD
AGND
LIN
BYPASS
FADE
LLINEIN
LHPIN
SHUTDOWN
PVDD
LOUT+
LOUT-
PGND
18
17
C(BYP)
1kΩ
16
Cc
15
14
13
System
Control
Left
Speaker
Figure 1. SM7511 Application Circuit Using Single-Ended Inputs and Input MUX
Page 8
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
APPLICATION INFORMATION ( continued )
The figure is schematic diagrams of typical notebook computer application circuits.
Right
Speaker
1
Cs
2
3
Power Supply
4
NC
Ci
Right Negative
Differential Input Signal
5
Ci
Right Positive
Differential Input Signal
6
VDD
Cs
Ci
Ci
Left Negative
Differential Input Signal
8
9
10
NC
11
Power Supply
Cs
SE/BTL
ROUTPVDD
RHPIN
HP/LINE
VOLUME
RLINEIN
SEDIFF
RIN
SEMAX
VDD
24
23
Cc
100kΩ
100kΩ
22
1kΩ
21
20
19
In From DAC
or
Potentiometer
(DC Voltage)
Headphones
7
Left Positive
Differential Input Signal
ROUT+
PGND
12
VDD
AGND
LIN
BYPASS
FADE
LLINEIN
LHPIN
SHUTDOWN
PVDD
LOUT+
LOUT-
PGND
18
17
C(BYP)
1kΩ
16
Cc
15
System
Control
14
Left
Speaker
13
Figure 2. SM7511 Application Circuit Using Differential Inputs
Page 9
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
SE/BTL OPERATION
The ability of the SM7511 to easily switch between BTL and SE modes is one of its most important cost saving
features. This feature eliminates the requirement for an additional headphone amplifier in applications where
internal stereo speakers are driven in BTL mode but external headphone or speakers must be accommodated.
Internal to the SM7511, two separate amplifiers drive OUT+ and OUT-. The SE/BTL input controls the operation
of the follower amplifier that drives LOUT- and ROUT-. When SE/BTL is held low, the amplifier is on and the
SM7511 is in the BTL mode. When SE/BTL is held high, the OUT- amplifiers are in a high output impedance
state, which configures the SM7511 as an SE driver from LOUT+ and ROUT+. IDD is reduced by approximately
one-third in SE mode. Control of the SE/BTL input can be from a logic-level CMOS source or, more typically,
from a resistor divider network as shown in Figure 3. The trip level for the SE/BTL input can be found in the
recommended operating condition table.
APPLICATION INFORMATION (continued)
4
RHPIN
5 RLINEIN
22
6
HP/LINE
RIN
R
MUX
Input
MUX
Control
_
_
+
ROUT+ 24
+
BYP
VDD
BYP
_
+
_
+
BYP
100KΩ
ROUT-
2
SE/BTL
23 100KΩ
EN
Co
330μF
1KΩ
LOUT+
Figure 3. SM7511 Resistor Divider Network Circuit
Using a 1/8-in. (3,5mm) stereo headphone jack, the control switch is closed when no plug is inserted. When
closed the 100KΩ/1KΩ divider pulls the SE/BTL input low. When a plug is inserted, the 1KΩ resistor is
disconnected and SE/BTL input is pulled high. When the input goes high, the OUT- amplifier is shut down
causing the speaker to mute (open-circuits the speaker). The OUT+ amplifier then drives through the output
capacitor (CO) into the headphone jack.
Page 10
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
HP/LINE OPERATION
The HP/LINE input controls the internal input multiplexer (MUX). Refer to the block diagram in Figure 3. This
allows the device to switch between two separate stereo inputs to the amplifier. For design flexibility, the
HP/LINE control is independent of the output mode, SE or BTL, which is cotrolled by the aforementioned
SE/BTL pin. To allow the amplifier to switch from the LINE inputs to the HP inputs when the output switches
from BTL mode to SE mode, simply connect the SE/BTL control input to the HP/LINE input.
When this input is logic high, the RHPIN and LHPIN inputs are selected. When this terminal is logic low, the
RLINEIN and LLINEIN inputs are selected. This operation is also detailed in Table 3 and the trip levels for a
logic low (VIL) or logic high (VIH) can be found in the recommended operating conditions table.
Table 3. HP/LINE, SE/BTL, and Shudown Functions
INPUTS (1)
HP/LINE
SE/BTL
AMPLIFIER STATE
SHUTDOWN
INPUT
OUTPUT
X
X
Low
X
MUTE
Low
Low
High
LINE
BTL
Low
High
High
LINE
SE
High
Low
High
HP
BTL
High
High
High
HP
SE
(1) Inputs should never be left unconnected
SHUTDOWN MODES
The SM7511 employs a shutdown mode of operation designed to reduce supply current (IDD) to the absolute
minimum level during periods of nonuse for battery-power conservation. The SHUTDOWN input terminal should
be held high during normal operation when the amplifier is in use. Pulling SHUTDOWN low causes the outputs
to mute and the amplifier to enter a low-current state, I DD = 20μA. SHUTDOWN should never be left
unconnected because amplifier operation would be unpredictable.
FADE OPERATION
For design flexibility, a fade mode is provided to slowly ramp up the amplifier gain when coming out of
shutdown mode and conversely ramp the gain down when going into shutdown. This mode provides a smooth
transition between the active and shutdown states and virtually eliminates any pops or clicks on the outputs.
When the FADE input is a logic low, the device is placed into fade-on mode. A logic high on this pin places the
amplifier in the fade-off mode. The voltage trip levels for a logic low (VIL) or logic high (VIH) can be found in the
recommended operating conditions table.
When a logic low is applied to the FADE pin and a logic low is then applied on the SHUTDOWN pin, the
channel gain steps down from gain step to gain step at a rate of two clock cycles per step. With a nominal
internal clock frequency of 58Hz, this equates to 34 ms per step. The gain steps down until the lowest gain step
is reached. The time it takes to reach this step depends on the gain setting prior to placing the device in
shutdown. For example, if the amplifier is in the highest gain mode of 20 dB, the time it takes to ramp down the
channel gain is 1.05 seconds. This number is calculated by taking the number of steps to reach the lowest gain
from the highest gain, or 31 steps, and multiplying by the time per step, or 34 ms.
Page 11
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
After the channel gain is stepped down to the lowest gain, the amplifier begins discharging the bypass
capacitor from the nominal voltage of VDD/ 2 to ground. This time is dependent on the value of the bypass
capacitor. For a 0.47μF capacitor that is used in the application diagram in Figure 1, the time is approximately
500 ms. This time scales linearly with the value of bypass capacitor. For example, if a 1μF capacitor is used for
bypass, the time period to discharge the capacitor to ground is twice that of the 0.47μF capacitor, or 1 seconds.
Figure 3 below is a waveform captured at the output during the shutdown sequence when the part is in fade-on
mode. The gain is set to the highest level and the output is at VDD when the amplifier is shut down.
When a logic high is placed on the SHUTDOWN pin and the FADE pin is still held low, the device begins the
start-up process. The bypass capacitor will begin charging. Once the bypass voltage reaches the final value of
VDD/2, the gain increases in 2 dB steps from the lowest gain level to the gain level set by the dc voltage applied
to the VOLUME, SEDIFF and SEMAX pins.
In the fade-off mode, the amplifier stores the gain value prior to starting the shutdown sequences. The output of
the amplifier immediately drops to VDD/2 and the bypass capacitor begins a smooth discharge to ground. When
shutdown is released, the bypass capacitor charges up to VDD/2 and the channel gain returns immediately to
the value stored in memory. Figure 4 below is a waveform captured at the output during the shutdown
sequence when ths part is in the fade-off mode. The gain is set to the highest level, and the output is at VDD
when the amplifier is shut down.
The power-up sequence is different from the shutdown sequence and the voltage on the FADE pin does not
change the power-up sequence. Upon a power-up condition, the SM7511 begins in the lowest gain setting and
steps up 2 dB every 2 clock cycles until the final value is reached as determined by the dc voltage applied to
the VOLUME, SEDIFF and SEMAX pins.
Figure 5. Shutdown Sequence in the
Fade-off mode
Figure 4. Shutdown Sequence in the
Fade-on mode
VOLUME, SEDIFF AND SEMAX OPERATION
Three pins labeled VOLUME, SEDIFF and SEMAX control the BTL volume when driving speakers and the SE
volume when driving headphones. All of these pins are controlled with a dc voltage, which should not exceed
VDD.
When driving speakers in BTL mode, the VOLUME pin is the only pin that controls the gain. Table 1 shows the
gain for the BTL mode. The voltage listed in the table are for VDD=5V. For a different VDD, the values in the
table scale linearly. If VDD=4V, multiply all the voltages in the table by 4V/5V or 0.8.
Page 12
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
The SM7511 allows the user to specify a difference between BTL gain and SE gain. This is desirable to avoid
any listening discomfort when plugging in headphones. When switching to SE mode, the SEDIFF and SEMAX
pins control the single-ended gain proportional to the gain set by the voltage on the VOLUME pin. When
SEDIFF =0V, the difference between the BTL gain and the SE gain is 6dB. As the voltage on the SEDIFF
terminal is increased, the gain in SE mode decreases. The voltage on the SEDIFF terminal is subtracted from
the voltage on the VOLUME terminal and this value is used to determine the SE gain.
Some audio systems require that the gain be limited in the single-ended mode to a level that is comfortable for
headphone listening. Most volume control devices only have one terminal for setting the gain. For example, if
the speaker gain is 20 dB, the gain in the headphone channel is fixed at 14 dB. The level of gain could cause
discomfort to listeners and the SEMAX pin allows the designer to limit this discomfort when plugging in
headphones. The SEMAX terminal controls the maximum gain for single-ended mode.
The funtionality of the SEDIFF and SEMAX pin are combined to set the SE gain. A block diagram of the
combined funtionality is shown in Figure 6. The value obtained from the block diagram for SE_VOLUME is a dc
voltage that can be used in conjunction with Table 2 to determine the SE gain. Again, the voltage listed in the
table are for VDD=5V. The values must be scaled for other values of VDD.
Table 1 and Table 2 show a range of voltages for each gain step. There is a gap in the voltage between each
gain step. This gap represents the hysteresis about each trip point in the internal comparator. The hysteresis
ensures that the gain control is monotonic and does not oscillate from one gain step to another. If a
potentiometer is used to adjust the voltage on the control terminals, the gain increases as the potentiometer is
turned in one direction and decreases as it is turned back the other direction. The trip point, where the gain
actually changes, is different depending on whether the voltage is increased or decreased as a result of the
hysteresis about each trip point. The gaps in Table 1 and Table 2 can also be thought of as indeterminate
states where the gain could be in the next higher gain step or the lower gain step depending on the direction the
voltage is changing. If using a DAC to control the volume, set the volume, set the voltage in the middle of each
range to ensure that the desired gain is achieved.
A pictorial representation of the volume control can be found in Figure 7. The graph focuses on three gain steps
with the trip points defined in Table 1 for BTL gain. The dotted line represents the hysteresis about each gain
step.
SEDIFF(V)
VOLUME(V)
+
SEMAX(V)
VOLUME-SEDIFF
Is SEMAX>
(VOLUME-SEDIFF)?
YES
SE_VOLUME(V)=VOLUME(V)-SEDIFF(V)
SE_VOLUME(V)=SEMAX(V)
Figure 6. Block Diagram of SE Volume Control
Page 13
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
BTL Gain-dB
4
2
0
2.92
3.0 3.03
2.81
Voltage on VOLUME Pin-V
Figure 7. DC Volume Control Operation
TABLE OF GRAPHS
FIGURE
THD+N Total harmonic distortion plus noise(BTL)
THD+N Total harmonic distortion plus noise(SE)
vs Frequency
8,9,10
vs Output power
vs Frequency
11
vs Output power
Closed loop response
12,13,14,15,16,17,18,19
21,22,23
24,25
vs Frequency
26,27
PSRR Power supply ripple rejection(BTL)
vs Frequency
28
PSRR Power supply ripple rejection(SE)
vs Frequency
29
Vn
vs Frequency
30
Crosstalk
Output noise voltage
TOTAL HARMONIC DISTORTION + NOISE
vs
FREQUENCY
THD+N-Total Harmonic Distortion +Noise-%
THD+N-Total Harmonic Distortion +Noise-%
TOTAL HARMONIC DISTORTION + NOISE
vs
FREQUENCY
f-Frequency-Hz
f-Frequency-Hz
Figure-8
Figure-9
Page 14
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
TOTAL HARMONIC DISTORTION + NOISE
vs
FREQUENCY
THD+N-Total Harmonic Distortion +Noise-%
THD+N-Total Harmonic Distortion +Noise-%
TOTAL HARMONIC DISTORTION + NOISE
vs
FREQUENCY
Page 10
V.1.10 Dec 21,2005
f-Frequency-Hz
f-Frequency-Hz
Figure-10
Figure-11
TOTAL HARMONIC DISTORTION + NOISE
vs
OUTPUT POWER
THD+N-Total Harmonic Distortion +Noise-%
THD+N-Total Harmonic Distortion +Noise-%
TOTAL HARMONIC DISTORTION + NOISE
vs
OUTPUT POWER
Po-Output Power - W
Po-Output Power - W
Figure-12
Figure-13
Page 15
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
TOTAL HARMONIC DISTORTION + NOISE
vs
OUTPUT POWER
THD+N-Total Harmonic Distortion +Noise-%
THD+N-Total Harmonic Distortion +Noise-%
TOTAL HARMONIC DISTORTION + NOISE
vs
OUTPUT POWER
Figure-15
TOTAL HARMONIC DISTORTION + NOISE
vs
OUTPUT POWER
TOTAL HARMONIC DISTORTION + NOISE
vs
OUTPUT POWER
THD+N-Total Harmonic Distortion +Noise-%
Po-Output Power - W
Figure-14
THD+N-Total Harmonic Distortion +Noise-%
Po-Output Power - W
Po-Output Power - W
Po-Output Power - W
Figure-16
Figure-17
Page 16
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
TOTAL HARMONIC DISTORTION + NOISE
vs
OUTPUT POWER
THD+N-Total Harmonic Distortion +Noise-%
THD+N-Total Harmonic Distortion +Noise-%
TOTAL HARMONIC DISTORTION + NOISE
vs
OUTPUT POWER
Po-Output Power - W
Po-Output Power - W
Figure-18
Figure-19
TOTAL HARMONIC DISTORTION + NOISE
vs
OUTPUT POWER
THD+N-Total Harmonic Distortion +Noise-%
THD+N-Total Harmonic Distortion +Noise-%
TOTAL HARMONIC DISTORTION + NOISE
vs
OUTPUT POWER
Po-Output Power - W
Po-Output Power - W
Figure-20
Figure-21
Page 17
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
THD+N-Total Harmonic Distortion +Noise-%
TOTAL HARMONIC DISTORTION + NOISE
vs
OUTPUT POWER
THD+N-Total Harmonic Distortion +Noise-%
TOTAL HARMONIC DISTORTION + NOISE
vs
OUTPUT POWER
Po-Output Power - W
Po-Output Power - W
Figure-22
Figure-23
Phase - Degrees
Closed Loop Gain-dB
CLOSED LOOP RESPONSE
Phase - Degrees
Closed Loop Gain-dB
CLOSED LOOP RESPONSE
f-Frequency-Hz
f-Frequency-Hz
Figure-24
Figure-25
Page 18
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
CROSSTALK
vs
FREQUENCY
Crosstalk -dB
Crosstalk -dB
CROSSTALK
vs
FREQUENCY
f-Frequency-Hz
f-Frequency-Hz
Figure-26
Figure-27
POWER SUPPLY REJECTION RATIO
vs
FREQUENCY
PSRR-Power Supply Rejection Ratio - dB
PSRR-Power Supply Rejection Ratio - dB
POWER SUPPLY REJECTION RATIO
vs
FREQUENCY
f-Frequency-Hz
f-Frequency-Hz
Figure-28
Figure-29
Page 19
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
Vn – Output Noise Voltage - uVrms
OUTPUT NOISE VOLTAGE
vs
FREQUENCY
f-Frequency-Hz
Figure-30
Page 20
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
PACKAGE OUTLINE
Unit : mm
SM7511 24 PIN TSSOP ( 150mil )
Thermal Pad
(NOTE 5)
D
12
E
A2
Gauge plane
0.2000
e
SYMBOLS
A
A1
A2
b
C
D
E
E1
e
L
y
θ
L1
b
A1
12°(4X)
y
MIN.
―
0.00
0.80
0.19
0.09
7.70
6.20
4.30
―
0.45
―
0°
0.90
NOM.
―
―
1.00
―
―
7.80
6.40
4.40
0.65
0.60
―
―
1.00
L1
1
A
13
E1
24
L
C
MAX.
1.15
0.10
1.05
0.30
0.20
7.90
6.60
4.50
―
0.75
0.10
8°
1.10
NOTES:
1. PACKAGE BODY SIZE EXCLUDE MOLD FLASH PROTRUSION
OR GATE BURRS.
2. TOLERANCE ± 0.1mm UNLESS OTHERWISE SPECIFIED
3. COPLANARITY：0.1mm
4. CONTROLLING DIMENSION IS MILLIMETER. CONVERTED
INCH DIMENSION ARE NOT NECESSARILY EXACT.
5. DIE PAD EXPOSURE SIZE IS ACCORDING TO LEAD FRAME
DESIGN
6. FOLLOWED FROM JEDEC MO-153
Page 21
V.1.3 Revised April 02,2007
SAMHOP Microelectronics Corp.
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
Ordering Information
Package
Marking
Part Number ( Tape and Reel )
TSSOP-24
SM7511
SM7511
Package
Marking
Lead Free Part Number
TSSOP-24
SM7511L
SM7511L
Package
Marking
Green Part Number
TSSOP-24
SM7511G
SM7511G
Lead Free Information
Green Information
Page 22
V.1.3 Revised April 02,2007