NSC LM4839 Stereo 2w audio power amplifiers with dc volume control, bass boost, and input mux Datasheet

LM4839
Stereo 2W Audio Power Amplifiers
with DC Volume Control, Bass Boost, and Input Mux
General Description
Key Specifications
The LM4839 is a monolithic integrated circuit that provides
DC volume control, and stereo bridged audio power amplifiers capable of producing 2W into 4Ω (Note 1) with less than
1.0% THD+N, or 2.2W into 3Ω (Note 2) with less than 1.0%
THD+N.
Boomer ® audio integrated circuits were designed specifically
to provide high quality audio while requiring a minimum
amount of external components. The LM4839 incorporates a
DC volume control, stereo bridged audio power amplifiers,
selectable gain or bass boost, and an input mux making it
optimally suited for multimedia monitors, portable radios,
desktop, and portable computer applications.
The LM4839 features an externally controlled, low-power
consumption shutdown mode, and both a power amplifier
and headphone mute for maximum system flexibility and
performance.
n PO at 1% THD+N
n
into 3Ω (LQ & MTE)
n
into 4Ω (LQ & MTE)
n
into 8Ω (LM4839) (MT, MTE, & LQ)
n Single-ended mode - THD+N at 85mW into
32Ω
n Shutdown current
Note 1: When properly mounted to the circuit board, the LM4839LQ and
LM4839MTE will deliver 2W into 4Ω. The LM4839MT will deliver 1.1W into
8Ω. See the Application Information section for LM4839LQ and LM4839MTE
usage information.
Note 2: An LM4839LQ and LM4839MTE that have been properly mounted
to the circuit board and forced-air cooled will deliver 2.2W into 3Ω.
2.2W(typ)
2.0W(typ)
1.1W(typ)
1.0%(typ)
0.2µA(typ)
Features
n
n
n
n
n
n
n
DC Volume Control Interface
Input mux
System Beep Detect
Stereo switchable bridged/single-ended power amplifiers
Selectable internal/external gain and bass boost
“Click and pop” suppression circuitry
Thermal shutdown protection circuitry
Applications
n Portable and Desktop Computers
n Multimedia Monitors
n Portable Radios, PDAs, and Portable TVs
Connection Diagrams
LLP Package
DS200134-83
Top View
Order Number LM4839LQ
See NS Package Number LQA028AA for Exposed-DAP LLP
Boomer ® is a registered trademark of NationalSemiconductor Corporation.
© 2002 National Semiconductor Corporation
DS200134
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LM4839 Stereo 2W Audio Power Amplifiers with DC Volume Control, Bass Boost, and Input Mux
April 2002
LM4839
Connection Diagrams
(Continued)
TSSOP Package
DS200134-2
Top View
Order Number LM4839MT
See NS Package Number MTC28 for TSSOP
Order Number LM4839MTE
See NS Package Number MXA28A for Exposed-DAP TSSOP
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θJA (typ) — LQA028AA
42˚C/W
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
θJC (typ) — MTC28
20˚C/W
θJA (typ) — MTC28
80˚C/W
Supply Voltage
θJC (typ) — MXA28A
6.0V
Storage Temperature
-65˚C to +150˚C
Input Voltage
−0.3V to VDD +0.3V
Power Dissipation
Internally limited
ESD Susceptibility (Note 12)
2500V
ESD Susceptibility (Note 13)
Junction Temperature
250V
150˚C
Soldering Information
Vapor Phase (60 sec.)
Infrared (15 sec.)
215˚C
41˚C/W
θJA (typ) — MXA28A (exposed
DAP) (Note 3)
54˚C/W
θJA (typ) — MXA28A (exposed
DAP) (Note 5)
59˚C/W
θJA (typ) — MXA28A (exposed
DAP) (Note 6)
93˚C/W
Operating Ratings
220˚C
See AN-450 “Surface Mounting and their Effects on
Product Reliability” for other methods of soldering
surface mount devices.
θJC (typ) — LQA028AA
2˚C/W
θJA (typ) — MXA28A (exposed
DAP) (Note 4)
Temperature Range
TMIN ≤ TA ≤TMAX
−40˚C ≤TA ≤ 85˚C
Supply Voltage
2.7V≤ VDD ≤ 5.5V
3˚C/W
Electrical Characteristics for Entire IC
(Notes 7, 10)
The following specifications apply for VDD = 5V and TA = 25˚C unless otherwise noted.
LM4839
Symbol
Parameter
Conditions
Typical
(Note 14)
Limit
(Note 15)
Units
(Limits)
VDD
Supply Voltage
IDD
Quiescent Power Supply Current
VIN = 0V, IO = 0A
15
ISD
Shutdown Current
Vshutdown = VDD
0.7
VIH
VIN High on all Logic Inputs
VIL
VIN Low on all Logic Inputs
0.2 x VDD
V (max)
2.7
V (min)
5.5
V (max)
30
mA (max)
2.0
µA (max)
0.8 x VDD
V (min)
Electrical Characteristics for Volume Attenuators
(Notes 7, 10)
The following specifications apply for VDD = 5V and TA = 25˚C unless otherwise noted.
LM4839
Symbol
Parameter
Conditions
CRANGE
Attenuator Range
Gain with VDCVol = 5.0V, No Load
CRANGE
Attenuator Range
Attenuation with VDCVol = 0V (BM &
SE)
AM
Mute Attenuation
Typical
(Note 14)
Limit
(Note 15)
Units
(Limits)
± 0.75
dB (max)
-75
dB (min)
Vmute = 5V, Bridged Mode (BM)
-78
dB (min)
Vmute = 5V, Single-Ended Mode (SE)
-78
dB (min)
3
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LM4839
Absolute Maximum Ratings (Note 10)
LM4839
Electrical Characteristics for Single-Ended Mode Operation
(Notes 7, 10)
The following specifications apply for VDD = 5V and TA = 25˚C unless otherwise noted.
LM4839
Symbol
PO
Parameter
Output Power
Conditions
Typical
(Note 14)
Units
(Limits)
Limit
(Note 15)
THD+N = 1.0%; f = 1kHz;
RL = 32Ω
85
mW
THD+N = 10%; f = 1 kHz; RL =
32Ω
95
mW
0.065
%
THD+N
Total Harmonic Distortion+Noise
VOUT = 1VRMS, f=1kHz, RL = 10kΩ,
AVD = 1
PSRR
Power Supply Rejection Ratio
CB = 1.0 µF, f =120 Hz,
VRIPPLE = 200 mVrms
58
dB
SNR
Signal to Noise Ratio
POUT =75 mW, R
Filter
102
dB
Xtalk
Channel Separation
f=1kHz, CB = 1.0 µF
65
dB
L
= 32Ω, A-Wtd
Electrical Characteristics for Bridged Mode Operation
(Notes 7, 10)
The following specifications apply for VDD = 5V and TA = 25˚C unless otherwise noted.
LM4839
Symbol
Parameter
Conditions
Typical
(Note 14)
Units
(Limits)
Limit
(Note 15)
± 50
VOS
Output Offset Voltage
VIN = 0V, No Load
PO
Output Power
THD + N = 1.0%; f=1kHz; RL = 3Ω
(Note 8)
2.2
W
THD + N = 1.0%; f=1kHz; RL = 4Ω
(Note 9)(Note 15)
2
W
mV (max)
THD = 1.5% (max);f = 1 kHz;
RL = 8Ω
1.1
THD+N = 10%;f = 1 kHz; RL = 8Ω
1.5
W
PO = 1W, 20 Hz < f < 20 kHz,
RL = 8Ω, AVD = 2
0.3
%
1.0
W (min)
THD+N
Total Harmonic Distortion+Noise
PO = 340 mW, RL = 32Ω
1.0
%
PSRR
Power Supply Rejection Ratio
CB = 1.0 µF, f = 120 Hz,
VRIPPLE = 200 mVrms; RL = 8Ω
74
dB
SNR
Signal to Noise Ratio
VDD = 5V, POUT = 1.1W, RL = 8Ω,
A-Wtd Filter
93
dB
Xtalk
Channel Separation
f=1kHz, CB = 1.0 µF
70
dB
Note 3: The θJA given is for an MXA28A package whose exposed-DAP is soldered to an exposed 2in
2
piece of 1 ounce printed circuit board copper.
Note 4: The θJA given is for an MXA28A package whose exposed-DAP is soldered to a 2in2 piece of 1 ounce printed circuit board copper on a bottom side layer
through 21 8mil vias.
Note 5: The θJA given is for an MXA28A package whose exposed-DAP is soldered to an exposed 1in 2 piece of 1 ounce printed circuit board copper.
Note 6: The θJA given is for an MXA28A package whose exposed-DAP is not soldered to any copper.
Note 7: All voltages are measured with respect to the ground pins, unless otherwise specified. All specifications are tested using the typical application as shown
in Figure 2.
Note 8: When driving 3Ω loads from a 5V supply the LM4839MTE exposed DAP must be soldered to the circuit board and forced-air cooled.
Note 9: When driving 4Ω loads from a 5V supply the LM4839MTE exposed DAP must be soldered to the circuit board.
Note 10: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
Note 11: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θ JA, and the ambient temperature TA. The maximum
allowable power dissipation is PDMAX = (TJMAX − TA )/θJA. For the LM4839MT, TJMAX = 150˚C, and the typical junction-to-ambient thermal resistance, when board
mounted, is 80˚C/W assuming the MTC28 package.
Note 12: Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 13: Machine Model, 220 pF–240 pF discharged through all pins.
Note 14: Typicals are measured at 25˚C and represent the parametric norm.
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(Continued)
Note 15: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. Limits are guaranteed to National’s AOQL (Average Outgoing
Quality Level).
5
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LM4839
Electrical Characteristics for Bridged Mode Operation
FIGURE 1. Typical Application Circuit ( MT & MTE pinout )
DS200134-3
LM4839
Typical Application
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(Note 16)
Mute
Mux Control
HP Sense
Inputs Selected
Bridged Output
Single-Ended Output
0
0
0
Left In 1, Right In 1
Vol. Adjustable
-
0
0
1
Left In 1, Right In 1
Muted
Vol. Adjustable
0
1
0
Left In 2, Right In 2
Vol. Adjustable
-
0
1
1
Left In 2, Right In 2
Muted
Vol. Adjustable
1
X
X
-
Muted
Muted
Note 16: If system beep is detected on the Beep in pin (pin 11) and beep is fed to inputs, the system beep will be passed through the bridged amplifier regardless
of the logic of the Mute, HP sense, or DC Volume Control pins.
Typical Performance Characteristics
MTE Specific Characteristics
LM4839MTE
THD+N vs Output Power
LM4839MTE
THD+N vs Frequency
DS200134-70
LM4839MTE
THD+N vs Frequency
LM4839MTE
THD+N vs Output Power
DS200134-71
LM4839MTE
Power Dissipation vs Output Power
DS200134-72
LM4839MTE (Note 17)
Power Derating Curve
DS200134-65
DS200134-64
DS200134-73
Note 17: These curves show the thermal dissipation ability of the LM4839MTE at different ambient temperatures given these conditions:
500LFPM + 2in2: The part is soldered to a 2in2, 1 oz. copper plane with 500 linear feet per minute of forced-air flow across it.
2in2on bottom: The part is soldered to a 2in2, 1oz. copper plane that is on the bottom side of the PC board through 21 8 mil vias.
2in2: The part is soldered to a 2in2, 1oz. copper plane.
1in2: The part is soldered to a 1in2, 1oz. copper plane.
Not Attached: The part is not soldered down and is not forced-air cooled.
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LM4839
Truth Table for Logic Inputs
LM4839
Non-MTE Specific Characteristics
THD+N vs Frequency
THD+N vs Frequency
DS200134-57
THD+N vs Frequency
THD+N vs Frequency
DS200134-58
THD+N vs Frequency
DS200134-15
THD+N vs Frequency
THD+N vs Frequency
DS200134-16
THD+N vs Frequency
DS200134-18
THD+N vs Frequency
DS200134-14
DS200134-17
THD+N vs Frequency
DS200134-19
THD+N vs Frequency
DS200134-20
THD+N vs Output Power
DS200134-24
DS200134-21
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DS200134-22
8
THD+N vs Output Power
LM4839
Non-MTE Specific Characteristics
(Continued)
THD+N vs Output Power
THD+N vs Output Power
DS200134-25
DS200134-27
DS200134-26
THD+N vs Output Power
THD+N vs Output Power
THD+N vs Output Power
DS200134-31
THD+N vs Output Power
DS200134-30
DS200134-29
DS200134-28
THD+N vs Output Power
THD+N vs Output Power
THD+N vs Output Power
DS200134-32
THD+N vs Output Voltage
Docking Station Pins
DS200134-33
THD+N vs Output Voltage
Docking Station Pins
DS200134-34
DS200134-59
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DS200134-60
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LM4839
Non-MTE Specific Characteristics
Output Power vs
Load Resistance
(Continued)
Output Power vs
Load Resistance
Output Power vs
Load Resistance
DS200134-62
DS200134-6
Power Supply
Rejection Ratio
DS200134-7
Output Power vs
Load Resistance
Dropout Voltage
DS200134-35
DS200134-53
DS200134-8
Noise Floor
Noise Floor
Volume Control
Characteristics
DS200134-41
DS200134-42
DS200134-36
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Power Dissipation vs
Output Power
LM4839
Non-MTE Specific Characteristics
(Continued)
Power Dissipation vs
Output Power
DS200134-51
Power Derating Curve
External Gain/Bass Boost
Characteristics
DS200134-52
Crosstalk
DS200134-61
Crosstalk
DS200134-49
DS200134-50
DS200134-63
Output Power
vs Supply voltage
Output Power
vs Supply Voltage
DS200134-54
Supply Current
vs Supply Voltage
DS200134-56
11
DS200134-9
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LM4839
Typical Performance Characteristics
Output Power vs
Load Resistance
Output Power vs
Load Resistance
Output Power vs
Load Resistance
DS200134-62
DS200134-6
Power Supply
Rejection Ratio
DS200134-7
Output Power vs
Load Resistance
Dropout Voltage
DS200134-35
DS200134-53
DS200134-8
Noise Floor
Noise Floor
Volume Control
Characteristics
DS200134-41
DS200134-42
DS200134-36
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Power Dissipation vs
Output Power
LM4839
Typical Performance Characteristics
(Continued)
Power Dissipation vs
Output Power
DS200134-51
External Gain/
Bass Boost
Characteristics
DS200134-52
DS200134-61
Power Derating Curve
Crosstalk
Crosstalk
DS200134-49
DS200134-50
DS200134-63
Output Power
vs Supply voltage
Output Power
vs Supply Voltage
DS200134-54
Supply Current
vs Supply Voltage
DS200134-56
13
DS200134-9
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LM4839
highest load dissipation and widest output voltage swing,
PCB traces that connect the output pins to a load must be as
wide as possible.
Application Information
EXPOSED-DAP MOUNTING CONSIDERATIONS
Poor power supply regulation adversely affects maximum
output power. A poorly regulated supply’s output voltage
decreases with increasing load current. Reduced supply
voltage causes decreased headroom, output signal clipping,
and reduced output power. Even with tightly regulated supplies, trace resistance creates the same effects as poor
supply regulation. Therefore, making the power supply
traces as wide as possible helps maintain full output voltage
swing.
The LM4839’s exposed-DAP (die attach paddle) packages
(MTE, LQ) provide a low thermal resistance between the die
and the PCB to which the part is mounted and soldered. This
allows rapid heat transfer from the die to the surrounding
PCB copper traces, ground plane and, finally, surrounding
air. The result is a low voltage audio power amplifier that
produces 2.1W at ≤ 1% THD with a 4Ω load. This high power
is achieved through careful consideration of necessary thermal design. Failing to optimize thermal design may compromise the LM4839’s high power performance and activate
unwanted, though necessary, thermal shutdown protection.
The MTE and LQ packages must have their exposed DAPs
soldered to a grounded copper pad on the PCB. The DAP’s
PCB copper pad is connected to a large plane of continuous
unbroken copper. This plane forms a thermal mass and heat
sink and radiation area. Place the heat sink area on either
outside plane in the case of a two-sided PCB, or on an inner
layer of a board with more than two layers. Connect the DAP
copper pad to the inner layer or backside copper heat sink
area with 32(4x8) (MTE) or 6(3x2) (LQ) vias. The via diameter should be 0.012in–0.013in with a 1.27mm pitch. Ensure
efficient thermal conductivity by plating-through and solderfilling the vias.
Best thermal performance is achieved with the largest practical copper heat sink area. If the heatsink and amplifier
share the same PCB layer, a nominal 2.5in2 (min) area is
necessary for 5V operation with a 4Ω load. Heatsink areas
not placed on the same PCB layer as the LM4839 should be
5in2 (min) for the same supply voltage and load resistance.
The last two area recommendations apply for 25˚C ambient
temperature. Increase the area to compensate for ambient
temperatures above 25˚C. In systems using cooling fans, the
LM4839MTE can take advantage of forced air cooling. With
an air flow rate of 450 linear-feet per minute and a 2.5in2
exposed copper or 5.0in2 inner layer copper plane heatsink,
the LM4839MTE can continuously drive a 3Ω load to full
power. The LM4839LQ achieves the same output power
level without forced air cooling. In all circumstances and
conditions, the junction temperature must be held below
150˚C to prevent activating the LM4839’s thermal shutdown
protection. The LM4839’s power de-rating curve in the Typical Performance Characteristics shows the maximum
power dissipation versus temperature. Example PCB layouts
for the exposed-DAP TSSOP and LQ packages are shown in
the Demonstration Board Layout section. Further detailed
and specific information concerning PCB layout, fabrication,
and mounting an LQ (LLP) package is available in National
Semiconductor’s AN1187.
BRIDGE CONFIGURATION EXPLANATION
As shown in Figure 1, the LM4839 output stage consists of
two pairs of operational amplifiers, forming a two-channel
(channel A and channel B) stereo amplifier. (Though the
following discusses channel A, it applies equally to channel
B.)
Figure 1 shows that the first amplifier’s negative (-) output
serves as the second amplifier’s input. This results in both
amplifiers producing signals identical in magnitude, but 180˚
out of phase. Taking advantage of this phase difference, a
load is placed between −OUTA and +OUTA and driven differentially (commonly referred to as “bridge mode”). This
results in a differential gain of
AVD = 2 * (Rf/R i)
Bridge mode amplifiers are different from single-ended amplifiers that drive loads connected between a single amplifier’s output and ground. For a given supply voltage, bridge
mode has a distinct advantage over the single-ended configuration: its differential output doubles the voltage
swing across the load. This produces four times the output
power when compared to a single-ended amplifier under the
same conditions. This increase in attainable output power
assumes that the amplifier is not current limited or that the
output signal is not clipped. To ensure minimum output signal clipping when choosing an amplifier’s closed-loop gain,
refer to the Audio Power Amplifier Design section.
Another advantage of the differential bridge output is no net
DC voltage across the load. This is accomplished by biasing
channel A’s and channel B’s outputs at half-supply. This
eliminates the coupling capacitor that single supply, singleended amplifiers require. Eliminating an output coupling capacitor in a single-ended configuration forces a single-supply
amplifier’s half-supply bias voltage across the load. This
increases internal IC power dissipation and may permanently damage loads such as speakers.
POWER DISSIPATION
Power dissipation is a major concern when
successful single-ended or bridged amplifier.
states the maximum power dissipation point
ended amplifier operating at a given supply
driving a specified output load.
PCB LAYOUT AND SUPPLY REGULATION
CONSIDERATIONS FOR DRIVING 3Ω AND 4Ω LOADS
Power dissipated by a load is a function of the voltage swing
across the load and the load’s impedance. As load impedance decreases, load dissipation becomes increasingly dependent on the interconnect (PCB trace and wire) resistance
between the amplifier output pins and the load’s connections. Residual trace resistance causes a voltage drop,
which results in power dissipated in the trace and not in the
load as desired. For example, 0.1Ω trace resistance reduces
the output power dissipated by a 4Ω load from 2.1W to 2.0W.
This problem of decreased load dissipation is exacerbated
as load impedance decreases. Therefore, to maintain the
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(1)
PDMAX = (VDD)2/(2π2RL)
designing a
Equation (2)
for a singlevoltage and
Single-Ended
(2)
However, a direct consequence of the increased power delivered to the load by a bridge amplifier is higher internal
power dissipation for the same conditions.
14
heat sink, the θJA is the sum of θJC, θCS, and θSA. (θJC is the
junction-to-case thermal impedance, θCS is the case-to-sink
thermal impedance, and θSA is the sink-to-ambient thermal
impedance.) Refer to the Typical Performance Characteristics curves for power dissipation information at lower output power levels.
(Continued)
The LM4839 has two operational amplifiers per channel. The
maximum internal power dissipation per channel operating in
the bridge mode is four times that of a single-ended amplifier. From Equation (3), assuming a 5V power supply and a
4Ω load, the maximum single channel power dissipation is
1.27W or 2.54W for stereo operation.
PDMAX = 4 * (VDD)2/(2π2RL)
Bridge Mode
POWER SUPPLY BYPASSING
As with any power amplifier, proper supply bypassing is
critical for low noise performance and high power supply
rejection. Applications that employ a 5V regulator typically
use a 10 µF in parallel with a 0.1 µF filter capacitor to
stabilize the regulator’s output, reduce noise on the supply
line, and improve the supply’s transient response. However,
their presence does not eliminate the need for a local 1.0 µF
tantalum bypass capacitance connected between the
LM4839’s supply pins and ground. Do not substitute a ceramic capacitor for the tantalum. Doing so may cause oscillation. Keep the length of leads and traces that connect
capacitors between the LM4839’s power supply pin and
ground as short as possible. Connecting a 1µF capacitor,
CB, between the BYPASS pin and ground improves the
internal bias voltage’s stability and improves the amplifier’s
PSRR. The PSRR improvements increase as the bypass pin
capacitor value increases. Too large a capacitor, however,
increases turn-on time and can compromise the amplifier’s
click and pop performance. The selection of bypass capacitor values, especially CB, depends on desired PSRR requirements, click and pop performance (as explained in the section, Proper Selection of External Components), system
cost, and size constraints.
(3)
The LM4839’s power dissipation is twice that given by Equation (2) or Equation (3) when operating in the single-ended
mode or bridge mode, respectively. Twice the maximum
power dissipation point given by Equation (3) must not exceed the power dissipation given by Equation (4):
PDMAX' = (TJMAX − TA)/θJA
(4)
The LM4839’s TJMAX = 150˚C. In the LQ package soldered
to a DAP pad that expands to a copper area of 5in2 on a
PCB, the LM4839’s θJA is 20˚C/W. In the MTE package
soldered to a DAP pad that expands to a copper area of 2in2
on a PCB, the LM4839’s θJA is 41˚C/W. For the LM4839MT
package, θJA = 80˚C/W. At any given ambient temperature
TA, use Equation (4) to find the maximum internal power
dissipation supported by the IC packaging. Rearranging
Equation (4) and substituting PDMAX for PDMAX' results in
Equation (5). This equation gives the maximum ambient
temperature that still allows maximum stereo power dissipation without violating the LM4839’s maximum junction temperature.
TA = TJMAX – 2*PDMAX θJA
PROPER SELECTION OF EXTERNAL COMPONENTS
Optimizing the LM4839’s performance requires properly selecting external components. Though the LM4839 operates
well when using external components with wide tolerances,
best performance is achieved by optimizing component values.
The LM4839 is unity-gain stable, giving a designer maximum
design flexibility. The gain should be set to no more than a
given application requires. This allows the amplifier to
achieve minimum THD+N and maximum signal-to-noise ratio. These parameters are compromised as the closed-loop
gain increases. However, low gain circuits demand input
signals with greater voltage swings to achieve maximum
output power. Fortunately, many signal sources such as
audio CODECs have outputs of 1VRMS (2.83VP-P). Please
refer to the Audio Power Amplifier Design section for more
information on selecting the proper gain.
(5)
For a typical application with a 5V power supply and an 4Ω
load, the maximum ambient temperature that allows maximum stereo power dissipation without exceeding the maximum junction temperature is approximately 99˚C for the LQ
package and 45˚C for the MTE package.
TJMAX = PDMAX θJA + TA
(6)
Equation (6) gives the maximum junction temperature
TJMAX. If the result violates the LM4839’s TJMAX150˚C, reduce the maximum junction temperature by reducing the
power supply voltage or increasing the load resistance. Further allowance should be made for increased ambient temperatures.
The above examples assume that a device is a surface
mount part operating around the maximum power dissipation
point. Since internal power dissipation is a function of output
power, higher ambient temperatures are allowed as output
power or duty cycle decreases.
If the result of Equation (2) is greater than that of Equation
(3), then decrease the supply voltage, increase the load
impedance, or reduce the ambient temperature. If these
measures are insufficient, a heat sink can be added to
reduce θJA. The heat sink can be created using additional
copper area around the package, with connections to the
ground pin(s), supply pin and amplifier output pins. External,
solder attached SMT heatsinks such as the Thermalloy
7106D can also improve power dissipation. When adding a
Input Capacitor Value Selection
Amplifying the lowest audio frequencies requires a high
value input coupling capacitor (0.33µF in Figure 1). A high
value capacitor can be expensive and may compromise
space efficiency in portable designs. In many cases, however, the speakers used in portable systems, whether internal or external, have little ability to reproduce signals below
150Hz. Applications using speakers with this limited frequency response reap little improvement by using a large
input capacitor.
Besides effecting system cost and size, the input coupling
capacitor has an affect on the LM4835’s click and pop performance. When the supply voltage is first applied, a transient (pop) is created as the charge on the input capacitor
changes from zero to a quiescent state. The magnitude of
the pop is directly proportional to the input capacitor’s size.
15
www.national.com
LM4839
Application Information
LM4839
Application Information
VDD/2, coupling capacitors should be connected in series
with the load. Typical values for the coupling capacitors are
0.33µF to 1.0µF. If polarized coupling capacitors are used,
connect their ’+’ terminals to the respective output pin.
(Continued)
Higher value capacitors need more time to reach a quiescent
DC voltage (usually VDD/2) when charged with a fixed current. The amplifier’s output charges the input capacitor
through the feedback resistor, Rf. Thus, pops can be minimized by selecting an input capacitor value that is no higher
than necessary to meet the desired −3dB frequency.
As shown in Figure 1, the input resistors (RIN = 20K) and the
input capacitosr (CIN = 0.33µF) produce a −6dB high pass
filter cutoff frequency that is found using Equation (7).
Since the DOCK outputs precede the internal volume control, the signal amplitude will be equal to the input signal’s
magnitude and cannot be adjusted. However, the input amplifier’s closed-loop gain can be adjusted using external
resistors. These 20K resistors are shown in Figure 1 (RIN,
RF ) and they set each input amplifier’s gain to -1. Use
Equation 8 to determine the input and feedback resistor
values for a desired gain.
- Av = RF / Ri
(8)
(7)
Adjusting the input amplifier’s gain sets the minimum gain for
that channel. Although the single ended outputs of the
Bridge Output Amplifiers can be used to drive line level
outputs, it is recommended that the R & L Dock Outputs
simpler signal path be used for better performance.
As an example when using a speaker with a low frequency
limit of 150Hz, the input coupling capacitor using Equation
(7), is 0.063µF. The 0.33µF input coupling capacitor shown
in Figure 1 allows the LM4839 to drive high efficiency, full
range speaker whose response extends below 30Hz.
STEREO-INPUT MULTIPLEXER (STEREO MUX)
The LM4839 has two stereo inputs. The MUX CONTROL pin
controls which stereo input is active. Applying 0V to the MUX
CONTROL pin selects stereo input 1. Applying VDD to the
MUX CONTROL pin selects stereo input 2.
OPTIMIZING CLICK AND POP REDUCTION
PERFORMANCE
The LM4839 contains circuitry that minimizes turn-on and
shutdown transients or “clicks and pops”. For this discussion, turn-on refers to either applying the power supply voltage or when the shutdown mode is deactivated. While the
power supply is ramping to its final value, the LM4839’s
internal amplifiers are configured as unity gain buffers. An
internal current source changes the voltage of the BYPASS
pin in a controlled, linear manner. Ideally, the input and
outputs track the voltage applied to the BYPASS pin. The
gain of the internal amplifiers remains unity until the voltage
on the bypass pin reaches 1/2 VDD . As soon as the voltage
on the bypass pin is stable, the device becomes fully operational. Although the BYPASS pin current cannot be modified,
changing the size of CB alters the device’s turn-on time and
the magnitude of “clicks and pops”. Increasing the value of
CB reduces the magnitude of turn-on pops. However, this
presents a tradeoff: as the size of CB increases, the turn-on
time increases. There is a linear relationship between the
size of CB and the turn-on time. Here are some typical
turn-on times for various values of CB:
CB
BEEP DETECT FUNCTION
Computers and notebooks produce a system ’beep’ signal
that drives a small speaker. The speaker’s auditory output
signifies that the system requires user attention or input. To
accommodate this system alert signal, the LM4839’s beep
input pin is a mono input that accepts the beep signal.
Internal level detection circuitry at this input monitors the
beep signal’s magnitude. When a signal level greater than
VDD/2 is detected on the BEEP IN pin, the bridge output
amplifiers are enabled. The beep signal is amplified and
applied to the load connected to the output amplifiers. A valid
beep signal will be applied to the load even when MUTE is
active. Use the input resistors connected between the BEEP
IN pin and the stereo input pins to accommodate different
beep signal amplitudes. These resistors are shown as
200kΩ devices in Figure 1. Use higher value resistors to
reduce the gain applied to the beep signal. The resistors
must be used to pass the beep signal to the stereo inputs.
The BEEP IN pin is used only to detect the beep signal’s
magnitude: it does not pass the signal to the output amplifiers. The LM4839’s shutdown mode must be deactivated
before a system alert signal is applied to the BEEP IN pin.
TON
0.01µF
2ms
0.1µF
20ms
0.22µF
44ms
0.47µF
94ms
1.0µF
200ms
MICRO-POWER SHUTDOWN
The voltage applied to the SHUTDOWN pin controls the
LM4839’s shutdown function. Activate micro-power shutdown by applying VDD to the SHUTDOWN pin. When active,
the LM4839’s micro-power shutdown feature turns off the
amplifier’s bias circuitry, reducing the supply current. The
logic threshold is typically VDD/2. The low 0.7 µA typical
shutdown current is achieved by applying a voltage that is as
near as VDD as possible, to the SHUTDOWN pin. A voltage
that is less than VDD may increase the shutdown current.
Logic Level Truth Table shows the logic signal levels that
activate and deactivate micro-power shutdown and headphone amplifier operation.
There are a few ways to control the micro-power shutdown.
These include using a single-pole, single-throw switch, a
DOCKING STATION
Applications such as notebook computers can take advantage of a docking station to connect to external devices such
as monitors or audio/visual equipment that sends or receives
line level signals. The LM4839 has two outputs, Right Dock
and Left Dock which connect to outputs of the internal input
amplifiers that drive the volume control inputs. These input
amplifiers can drive loads of > 1kΩ (such as powered speakers) with a rail-to-rail signal. Since the output signal present
on the RIGHT DOCK and LEFT DOCK pins is biased to
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16
tee that the SHUTDOWN pin will not float. This prevents
unwanted state changes. In a system with a microprocessor
or a microcontroller, use a digital output to apply the control
voltage to the SHUTDOWN pin. Driving the SHUTDOWN pin
with active circuitry eliminates the need for a pull up resistor.
(Continued)
microprocessor, or a microcontroller. When using a switch,
connect an external 10kΩ pull-up resistor between the
SHUTDOWN pin and VDD. Connect the switch between the
SHUTDOWN pin and ground. Select normal amplifier operation by closing the switch. Opening the switch connects the
SHUTDOWN pin to VDD through the pull-up resistor, activating micro-power shutdown. The switch and resistor guaran-
TABLE 1. Logic Level Truth Table for SHUTDOWN, HP-IN, and MUX Operation
SHUTDOWN
PIN
HP-IN PIN
MUX CHANNEL
SELECT PIN
OPERATIONAL MODE
(MUX INPUT CHANNEL #)
Logic Low
Logic Low
Logic Low
Logic Low
Bridged Amplifiers (1)
Logic Low
Logic High
Bridged Amplifiers (2)
Logic Low
Logic Low
Logic High
Logic Low
Single-Ended Amplifiers (1)
Logic High
Logic High
Logic High
Single-Ended Amplifiers (2)
X
X
Micro-Power Shutdown
carry the ground return. A headphone jack with one control
pin contact is sufficient to drive the HP-IN pin when connecting headphones.
A microprocessor or a switch can replace the headphone
jack contact pin. When a microprocessor or switch applies a
voltage greater than 4V to the HP-IN pin, a bridge-connected
speaker is muted and the single ended output amplifiers A1
and A2 will drive a pair of headphones.
MUTE FUNCTION
The LM4839 mutes the amplifier and DOCK outputs when
VDD is applied to pin 5, the MUTE pin. Even while muted, the
LM4839 will amplify a system alert (beep) signal whose
magnitude satisfies the BEEP DETECT circuitry. Applying
0V to the MUTE pin returns the LM4839 to normal, unmated
operation. Prevent unanticipated mute behavior by connecting the MUTE pin to VDD or ground. Do not let the mute pin
float.
HP SENSE FUNCTION ( Head Phone In )
Applying a voltage between 4V and VDD to the LM4839’s
HP-IN headphone control pin turns off the amps that drive
the left out ’+’ and right out ’+’ pins. ( Pins 15 and 20 on the
MT/MTE & 12 and 25 on the LQ ). This action mutes a
bridged-connected load. Quiescent current consumption is
reduced when the IC is in this single-ended mode.
Figure 2 shows the implementation of the LM4839’s headphone control function. With no headphones connected to
the headphone jack, the R1-R2 voltage divider sets the
voltage applied to the HP Sense pin at approximately 50mV.
This 50mV puts the LM4839 into bridged mode operation.
The output coupling capacitor blocks the amplifier’s half
supply DC voltage, protecting the headphones.
The HP-IN threshold is set at 4V. While the LM4839 operates
in bridged mode, the DC potential across the load is essentially 0V. Therefore, even in an ideal situation, the output
swing cannot cause a false single-ended trigger. Connecting
headphones to the headphone jack disconnects the headphone jack contact pin from R2 and allows R1 to pull the HP
Sense pin up to VDD through R4. This enables the headphone function, turns off both of the ’+’ output amplifiers and
mutes the bridged speaker. The amplifier then drives the
headphones, whose impedance is in parallel with resistors
R2 and R3. These resistors have negligible effect on the
LM4839’s output drive capability since the typical impedance
of headphones is 32Ω.
Figure 2 also shows the suggested headphone jack electrical connections. The jack is designed to mate with a threewire plug. The plug’s tip and ring should each carry one of
the two stereo output signals, whereas the sleeve should
DS200134-4
FIGURE 2. Headphone Sensing Circuit (MT/MTE
Pinout)
BASS BOOST FUNCTION
The Bass Boost Function can be toggled by changing the
logic at the Bass Boost Select pin. A logic low will switch the
power amplifiers to bass boost mode. In bass boost mode,
the low frequency gain of the ampflifier is set by the external
CBS capacitor in Figure 1. Where as a logic high sets the
amplifiers to unity gain.
In some cases, a designer may want to improve the low
frequency response of the bridged amplifier or incorporate a
bass boost feature. This bass boost can be useful in systems
where speakers are housed in small enclosures. If the designer wishes to dsiable the bass boost feature, pin 19 (
MT/MTE packages ) can be tied to VDD.
17
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LM4839
Application Information
LM4839
Application Information
(Continued)
When the bass boost is enabled, the output amplifiers will be
internally set at a gain of 2 at low frequencies (gain of 4 in
bridged mode). As shown in Figure 1, CBS sets the cutoff
frequency for the bass boost. At low frequencies, the capacitor will be virtually an open circuit. At high frequencies, the
capacitor will be virtually a short circuit. As a result of this, the
gain of the bridge amplifier is increased as low frequencies.
A first order pole is formed with a corner frequency at:
fc = 1/(2π10kΩCBS)
(9)
With CBS = 0.1uF, a first order pole is formed with a corner
frequency of 160Hz.
DC VOLUME CONTROL
The LM4839 has an internal stereo volume control whose
setting is a function of the DC voltage applied to the DC VOL
CONTROL pin.
The LM4839 volume control consists of 31 steps that are
individually selected by a variable DC voltage level on the
volume control pin. The range of the steps, controlled by the
DC voltage, are from 0dB - 78dB. Each gain step corresponds to a specific input voltage range, as shown in table 2.
To minimize the effect of noise on the volume control pin,
which can affect the selected gain level, hysteresis has been
implemented. The amount of hysteresis corresponds to half
of the step width, as shown in Volume Control Characterization Graph (DS200133-40).
For highest accuracy, the voltage shown in the ’recommended voltage’ column of the table is used to select a
desired gain. This recommended voltage is exactly halfway
between the two nearest transitions to the next highest or
next lowest gain levels.
The gain levels are 1dB/step from 0dB to -6dB, 2dB/step
from -6dB to -36dB, 3dB/step from -36dB to -47dB, 4dB/step
from -47db to -51dB, 5dB/step from -51dB to -66dB, and
12dB to the last step at -78dB.
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18
Gain (dB)
Voltage Range (% of Vdd)
Voltage Range (Vdd = 5)
Voltage Range (Vdd = 3)
Low
High
Recommended
Low
High
Recommended
Low
High
Recommended
0
77.5%
100.00%
100.000%
3.875
5.000
5.000
2.325
3.000
3.000
-1
75.0%
78.5%
76.875%
3.750
3.938
3.844
2.250
2.363
2.306
-2
72.5%
76.25%
74.375%
3.625
3.813
3.719
2.175
2.288
2.231
-3
70.0%
73.75%
71.875%
3.500
3.688
3.594
2.100
2.213
2.156
-4
67.5%
71.25%
69.375%
3.375
3.563
3.469
2.025
2.138
2.081
-5
65.0%
68.75%
66.875%
3.250
3.438
3.344
1.950
2.063
2.006
-6
62.5%
66.25%
64.375%
3.125
3.313
3.219
1.875
1.988
1.931
-8
60.0%
63.75%
61.875%
3.000
3.188
3.094
1.800
1.913
1.856
-10
57.5%
61.25%
59.375%
2.875
3.063
2.969
1.725
1.838
1.781
-12
55.0%
58.75%
56.875%
2.750
2.938
2.844
1.650
1.763
1.706
-14
52.5%
56.25%
54.375%
2.625
2.813
2.719
1.575
1.688
1.631
-16
50.0%
53.75%
51.875%
2.500
2.688
2.594
1.500
1.613
1.556
-18
47.5%
51.25%
49.375%
2.375
2.563
2.469
1.425
1.538
1.481
-20
45.0%
48.75%
46.875%
2.250
2.438
2.344
1.350
1.463
1.406
-22
42.5%
46.25%
44.375%
2.125
2.313
2.219
1.275
1.388
1.331
-24
40.0%
43.75%
41.875%
2.000
2.188
2.094
1.200
1.313
1.256
-26
37.5%
41.25%
39.375%
1.875
2.063
1.969
1.125
1.238
1.181
-28
35.0%
38.75%
36.875%
1.750
1.938
1.844
1.050
1.163
1.106
-30
32.5%
36.25%
34.375%
1.625
1.813
1.719
0.975
1.088
1.031
-32
30.0%
33.75%
31.875%
1.500
1.688
1.594
0.900
1.013
0.956
-34
27.5%
31.25%
29.375%
1.375
1.563
1.469
0.825
0.937
0.881
-36
25.0%
28.75%
26.875%
1.250
1.438
1.344
0.750
0.862
0.806
-39
22.5%
26.25%
24.375%
1.125
1.313
1.219
0.675
0.787
0.731
-42
20.0%
23.75%
21.875%
1.000
1.188
1.094
0.600
0.712
0.656
-45
17.5%
21.25%
19.375%
0.875
1.063
0.969
0.525
0.637
0.581
-47
15.0%
18.75%
16.875%
0.750
0.937
0.844
0.450
0.562
0.506
-51
12.5%
16.25%
14.375%
0.625
0.812
0.719
0.375
0.487
0.431
-56
10.0%
13.75%
11.875%
0.500
0.687
0.594
0.300
0.412
0.356
-61
7.5%
11.25%
9.375%
0.375
0.562
0.469
0.225
0.337
0.281
-66
5.0%
8.75%
6.875%
0.250
0.437
0.344
0.150
0.262
0.206
-78
0.0%
6.25%
0.000%
0.000
0.312
0.000
0.000
0.187
0.000
19
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LM4839
Volume Control Table ( Table 2 )
LM4839
The last step in this design example is setting the amplifier’s
−3dB frequency bandwidth. To achieve the desired ± 0.25dB
pass band magnitude variation limit, the low frequency response must extend to at least one-fifth the lower bandwidth
limit and the high frequency response must extend to at least
five times the upper bandwidth limit. The gain variation for
both response limits is 0.17dB, well within the ± 0.25dB
desired limit. The results are an
AUDIO POWER AMPLIFIER
DESIGN
Audio Amplifier Design: Driving 1W into an 8Ω Load
The following are the desired operational parameters:
Power Output:
1 WRMS
Load Impedance:
8Ω
Input Level:
1 VRMS
Input Impedance:
Bandwidth:
fL = 100Hz/5 = 20Hz
(13)
fH = 20kHz x 5 = 100kHz
(14)
20 kΩ
and an
100 Hz−20 kHz ± 0.25 dB
The design begins by specifying the minimum supply voltage
necessary to obtain the specified output power. One way to
find the minimum supply voltage is to use the Output Power
vs Supply Voltage curve in the Typical Performance Characteristics section. Another way, using Equation (11), is to
calculate the peak output voltage necessary to achieve the
desired output power for a given load impedance. To account for the amplifier’s dropout voltage, two additional voltages, based on the Dropout Voltage vs Supply Voltage in the
Typical Performance Characteristics curves, must be
added to the result obtained by Equation (11). The result is
Equation (12).
As mentioned in the Selecting Proper External Components section, Ri (Right & Left) and Ci (Right & Left) create
a highpass filter that sets the amplifier’s lower bandpass
frequency limit. Find the coupling capacitor’s value using
Equation (17).
Ci≥ 1/(2πR ifL)
(15)
The result is
1/(2π*20kΩ*20Hz) = 0.397µF
(16)
(10)
Use a 0.39µF capacitor, the closest standard value.
VDD ≥ (VOUTPEAK+ (VODTOP + VODBOT))
(11)
The product of the desired high frequency cutoff (100kHz in
this example) and the differential gain AVD, determines the
upper passband response limit. With AVD = 3 and fH =
100kHz, the closed-loop gain bandwidth product (GBWP) is
300kHz. This is less than the LM4839’s 3.5MHz GBWP. With
this margin, the amplifier can be used in designs that require
more differential gain while avoiding performance,restricting
bandwidth limitations.
The Output Power vs Supply Voltage graph for an 8Ω load
indicates a minimum supply voltage of 4.6V. This is easily
met by the commonly used 5V supply voltage. The additional
voltage creates the benefit of headroom, allowing the
LM4839 to produce peak output power in excess of 1W
without clipping or other audible distortion. The choice of
supply voltage must also not create a situation that violates
of maximum power dissipation as explained above in the
Power Dissipation section.
After satisfying the LM4839’s power dissipation requirements, the minimum differential gain needed to achieve 1W
dissipation in an 8Ω load is found using Equation (13).
RECOMMENDED PRINTED
CIRCUIT BOARD LAYOUT
Figures 4 through 8 show the recommended four-layer PC
board layout that is optimized for the 8-pin LQ-packaged
LM4839 and associated external components. This circuit is
designed for use with an external 5V supply and 4Ω speakers.
This circuit board is easy to use. Apply 5V and ground to the
board’s VDD and GND pads, respectively. Connect 4Ω
speakers between the board’s −OUTA and +OUTA and
OUTB and +OUTB pads.
(12)
Thus, a minimum overall gain of 2.83 allows the LM4839’s to
reach full output swing and maintain low noise and THD+N
performance.
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20
LM4839
RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT
(Continued)
DS200134-78
Figure 4. Recommended LQ PC Board Layout:
Component-Side Silkscreen
21
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LM4839
RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT
(Continued)
DS200134-79
Figure 5. Recommended LQ PC Board Layout:
Component-Side Layout
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22
LM4839
RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT
(Continued)
DS200134-80
Figure 6. Recommended LQ PC Board Layout:
Upper Inner-Layer Layout
23
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LM4839
RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT
(Continued)
DS200134-81
Figure 7. Recommended LQ PC Board Layout:
Lower Inner-Layer Layout
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24
LM4839
RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT
(Continued)
DS200134-82
Figure 8. Recommended LQ PC Board Layout:
Bottom-Side Layout
25
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LM4839
RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT
(Continued)
Analog Audio LM4839 LLP28 Eval Board (LQ Package)
Assembly Part Number: 980011368-100
Revision: A1
Bill of Material
Item
Part Number
Part Description
Qty
1
551011368-001
LM4838 Eval Board PCB
etch 001
1
Ref Designator
10
482911368-001
LM4838 28L LLP
1
U4
20
151911368-001
Cer Cap 0.068µF 50V 10%
1206
2
CBB1, CBB2
25
152911368-001
Tant Cap 0.1µF 10V 10%
Size = A 3216
3
CS1, CS2, CV
26
152911368-002
Tant Cap 0.33µF 10V 10%
Size = A 3216
5
Cin1, Cin2, Cin3, Cin4, (Cin5
-CBEEPIN- not seen on Fig
1, only exists on LQ Demo
Board)
27
152911368-003
Tant Cap 1µF 16V 10% Size
= A 3216
3
CB, C01, C02
28
152911368-004
Tant Cap 10µF 10V 10%
Size = C 6032
1
CS3
29
152911368-005
Tant Cap 220µF 16V 10%
Size = D 7343
2
Cout1, Cout2
30
472911368-001
Res 150Ohm 1/8W 1% 1206
2
RL1, RL2
31
472911368-002
Res 20k Ohm 1/8W 1% 1206
10
Rin1, Rin2, RF1, RF2
Remark
Rl1, Rl2, RBS1, RBS2
Rdock1, Rdock2
32
472911368-003
Res 100k Ohm 1/8W 1%
1206
2
RS, RPU
33
472911368-004
Res 200k Ohm 1/16W 1%
0603
2
Rbeep1, Rbeep2
40
131911368-001
Stereo Headphone Jack W/
Switch
1
U2
41
131911368-002
Slide Switch
4
Mode, Mute, Gain, SD
Mouser # 10SP003
42
131911368-003
Potentiometer
1
U1
Mouser # 317-290-100K
43
131911368-004
RCA Jack
3
RightIn, BeepIn, LeftIn
Mouser # 16PJ097
44
131911368-005
Banana Jack, Black
3
GND, Right Out-, Left Out-
Mouser # ME164-6219
45
131911368-006
Banana Jack, Red
3
Vdd, Right Out+, Left Out+
Mouser # ME164-6218
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26
Mouser # 161-3500
LM4839
Recommended Printed Circuit
Board Layout - MT/MTE Packages
DS200134-84
Top Layer SilkScreen + Pad - ( Not to Scale )
DS200134-85
Top Layer - Not to scale - ( Not to Scale )
27
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LM4839
(Continued)
DS200134-86
Layer 2 - Not to scale - ( Not to Scale )
DS200134-87
Layer 3 - ( Not to scale )
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28
LM4839
(Continued)
DS200134-88
Bottom Layer - ( Not to scale )
29
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LM4839
(Continued)
Analog Audio LM4839 MSOP Eval Board
Assembly Part Number: 980011373-100
Revision: A
Bill of Material
Item
Part Number
Part Description
Qty
1
551011373-001
LM4839 Eval Board PCB
etch 001
1
Ref Designator (on PCB)
10
482911373-001
LM4839 MSOP
1
20
151911368-001
Cer Cap 0.068µF 50V 10%
1206
2
CBB (2)
25
152911368-001
Tant Cap 0.1µF 10V 10%
Size = A 3216
2
CS (2)
26
152911368-002
Tant Cap 0.33µF 10V 10%
Size = A 3216
4
CIN (4)
27
152911368-003
Tant Cap 1µF 16V 10% Size
= A 3216
1
CBYPASS
28
152911368-004
Tant Cap 10µF 10V 10%
Size = C 6032
1
CS1
29
152911368-005
Tant Cap 220µF 16V 10%
Size = D 7343
2
COUT R, COUT L
Remark
30
472911368-001
Res 1KΩ 1/8W 1% 1206
2
RL (2)
31
472911368-002
Res 20K Ohm 1/8W 1% 1206
8
RIN, RF
32
472911368-003
Res 100K Ohm 1/8W 1%
1206
2
R5, RPU
33
472911368-004
Res 200K Ohm 1/16W 1%
0603
4
RBEEP (R)
40
131911368-001
Stereo Headphone Jack W/
Switch
1
41
131911368-002
Slide Switch
4
mute, max,SD, BASS
Mouser # 10SP003
42
131911368-003
Potentiometer
1
Volume Control
Mouser # 317-2090-100K
43
131911368-004
RCA Jack
5
Mouser # 16PJ097
44
131911368-005
Banana Jack, Black
3
Mouser # ME164-6219
45
131911368-006
Banana Jack, Red
3
Mouser # ME164-6218
www.national.com
30
Mouser # 161-3500
LM4839
Physical Dimensions
inches (millimeters) unless otherwise noted
LLP Package
Order Number LM4839LQ
NS Package Number LQA028AA For Exposed-DAP LLP
31
www.national.com
LM4839
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
TSSOP Package
Order Number LM4839MT
NS Package Number MTC28 for TSSOP
www.national.com
32
LM4839
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
Exposed-DAP TSSOP Package
Order Number LM4839MTE
NS Package Number MXA28A for Exposed-DAP TSSOP
33
www.national.com
LM4839 Stereo 2W Audio Power Amplifiers with DC Volume Control, Bass Boost, and Input Mux
Notes
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
National Semiconductor
Corporation
Americas
Email: [email protected]
www.national.com
National Semiconductor
Europe
Fax: +49 (0) 180-530 85 86
Email: [email protected]
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
Email: [email protected]
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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