LM4839

Manufacturer Part NumberLM4839
DescriptionStereo 2W Audio Power Amplifiers with DC Volume Control/ Bass Boost/ and Input Mux
ManufacturerNational Semiconductor
LM4839 datasheet
 


1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
Page 1/34

Download datasheet (2Mb)Embed
Next
LM4839
Stereo 2W Audio Power Amplifiers
with DC Volume Control, Bass Boost, and Input Mux
General Description
The LM4839 is a monolithic integrated circuit that provides
DC volume control, and stereo bridged audio power amplifi-
ers capable of producing 2W into 4
1.0% THD+N, or 2.2W into 3
(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.
Note 1: When properly mounted to the circuit board, the LM4839LQ and
LM4839MTE will deliver 2W into 4 . The LM4839MT will deliver 1.1W into
8 . 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 3 .
Connection Diagrams
See NS Package Number LQA028AA for Exposed-DAP LLP
Boomer
®
is a registered trademark of NationalSemiconductor Corporation.
© 2002 National Semiconductor Corporation
Key Specifications
n P
at 1% THD+N
O
into 3
n
(Note 1) with less than
into 4
n
into 8
n
n Single-ended mode - THD+N at 85mW into
32
n Shutdown current
Features
n DC Volume Control Interface
n Input mux
n System Beep Detect
n Stereo switchable bridged/single-ended power amplifiers
n Selectable internal/external gain and bass boost
n “Click and pop” suppression circuitry
n Thermal shutdown protection circuitry
Applications
n Portable and Desktop Computers
n Multimedia Monitors
n Portable Radios, PDAs, and Portable TVs
LLP Package
Top View
Order Number LM4839LQ
DS200134
April 2002
(LQ & MTE)
2.2W(typ)
(LQ & MTE)
2.0W(typ)
(LM4839) (MT, MTE, & LQ)
1.1W(typ)
1.0%(typ)
0.2µA(typ)
DS200134-83
www.national.com

LM4839 Summary of contents

  • Page 1

    ... Note 1: When properly mounted to the circuit board, the LM4839LQ and LM4839MTE will deliver 2W into 4 . The LM4839MT will deliver 1.1W into 8 . 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 ...

  • Page 2

    ... Connection Diagrams See NS Package Number MXA28A for Exposed-DAP TSSOP www.national.com (Continued) TSSOP Package Top View Order Number LM4839MT See NS Package Number MTC28 for TSSOP Order Number LM4839MTE 2 DS200134-2 ...

  • Page 3

    ... V = 5V, Single-Ended Mode (SE) mute −40˚ MAX 2. LM4839 Typical Limit (Note 14) (Note 15) 2.7 5 0.7 2.0 0.8 x VDD 0.2 x VDD LM4839 Typical Limit (Note 14) (Note 15) ± 0.75 -75 -78 -78 www.national.com 42˚C/W 20˚C/W 80˚C/W 2˚C/W 41˚C/W 54˚C/W 59˚C/W 93˚C/W 85˚C 5.5V Units (Limits) V (min) V (max) mA (max) µ ...

  • Page 4

    ... 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 3 loads from a 5V supply the LM4839MTE exposed DAP must be soldered to the circuit board and forced-air cooled. Note 9: When driving 4 loads from a 5V supply the LM4839MTE exposed DAP must be soldered to the circuit board. ...

  • Page 5

    Electrical Characteristics for Bridged Mode Operation 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). (Continued) 5 www.national.com ...

  • Page 6

    Typical Application www.national.com 6 ...

  • Page 7

    ... MTE Specific Characteristics LM4839MTE THD+N vs Output Power DS200134-70 LM4839MTE THD+N vs Frequency DS200134-73 Note 17: These curves show the thermal dissipation ability of the LM4839MTE at different ambient temperatures given these conditions: 2 500LFPM + 2in : The part is soldered to a 2in 2 2in on bottom: The part is soldered to a 2in ...

  • Page 8

    Non-MTE Specific Characteristics THD+N vs Frequency DS200134-57 THD+N vs Frequency DS200134-15 THD+N vs Frequency DS200134-18 THD+N vs Frequency DS200134-21 www.national.com THD+N vs Frequency DS200134-58 THD+N vs Frequency DS200134-16 THD+N vs Frequency DS200134-19 THD+N vs Frequency DS200134-22 8 THD+N vs Frequency ...

  • Page 9

    Non-MTE Specific Characteristics THD+N vs Output Power DS200134-25 THD+N vs Output Power DS200134-28 THD+N vs Output Power DS200134-31 THD+N vs Output Power DS200134-34 (Continued) THD+N vs Output Power DS200134-26 THD+N vs Output Power DS200134-29 THD+N vs Output Power DS200134-32 THD+N ...

  • Page 10

    Non-MTE Specific Characteristics Output Power vs Load Resistance DS200134-62 Power Supply Rejection Ratio DS200134-35 Noise Floor DS200134-41 www.national.com (Continued) Output Power vs Load Resistance DS200134-6 Dropout Voltage DS200134-53 Noise Floor DS200134-42 10 Output Power vs Load Resistance DS200134-7 Output Power ...

  • Page 11

    Non-MTE Specific Characteristics Power Dissipation vs Output Power DS200134-51 Power Derating Curve DS200134-63 Output Power vs Supply voltage DS200134-54 (Continued) Power Dissipation vs Output Power DS200134-52 Crosstalk DS200134-49 Output Power vs Supply Voltage DS200134-56 11 External Gain/Bass Boost Characteristics DS200134-61 ...

  • Page 12

    Typical Performance Characteristics Output Power vs Load Resistance DS200134-62 Power Supply Rejection Ratio DS200134-35 Noise Floor DS200134-41 www.national.com Output Power vs Load Resistance DS200134-6 Dropout Voltage DS200134-53 Noise Floor DS200134-42 12 Output Power vs Load Resistance DS200134-7 Output Power vs ...

  • Page 13

    Typical Performance Characteristics Power Dissipation vs Output Power DS200134-51 Power Derating Curve DS200134-63 Output Power vs Supply voltage DS200134-54 (Continued) Power Dissipation vs Output Power DS200134-52 Crosstalk DS200134-49 Output Power vs Supply Voltage DS200134-56 13 External Gain/ Bass Boost Characteristics ...

  • Page 14

    ... If the heatsink and amplifier share the same PCB layer, a nominal 2.5in necessary for 5V operation with a 4 not placed on the same PCB layer as the LM4839 should be 2 5in (min) for the same supply voltage and load resistance. ...

  • Page 15

    ... Bridge Mode DMAX DD L The LM4839’s power dissipation is twice that given by Equa- tion (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 ex- ceed the power dissipation given by Equation (4): ...

  • Page 16

    ... 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. OPTIMIZING CLICK AND POP REDUCTION ...

  • Page 17

    ... DD 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 connect- ing the MUTE pin ground. Do not let the mute pin DD float ...

  • Page 18

    ... 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 ...

  • Page 19

    Volume Control Table ( Table 2 ) Gain (dB) Voltage Range (% of Vdd) Low High Recommended 0 77.5% 100.00% -1 75.0% 78.5% -2 72.5% 76.25% -3 70.0% 73.75% -4 67.5% 71.25% -5 65.0% 68.75% -6 62.5% 66.25% -8 60.0% ...

  • Page 20

    ... After satisfying the LM4839’s power dissipation require- ments, the minimum differential gain needed to achieve 1W dissipation load is found using Equation (13). 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. www.national.com The last step in this design example is setting the amplifier’ ...

  • Page 21

    RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT Figure 4. Recommended LQ PC Board Layout: Component-Side Silkscreen 21 (Continued) DS200134-78 www.national.com ...

  • Page 22

    RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT www.national.com Figure 5. Recommended LQ PC Board Layout: Component-Side Layout 22 (Continued) DS200134-79 ...

  • Page 23

    RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT Figure 6. Recommended LQ PC Board Layout: Upper Inner-Layer Layout 23 (Continued) DS200134-80 www.national.com ...

  • Page 24

    RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT www.national.com Figure 7. Recommended LQ PC Board Layout: Lower Inner-Layer Layout 24 (Continued) DS200134-81 ...

  • Page 25

    RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT Figure 8. Recommended LQ PC Board Layout: Bottom-Side Layout 25 (Continued) DS200134-82 www.national.com ...

  • Page 26

    ... RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT Analog Audio LM4839 LLP28 Eval Board (LQ Package) Assembly Part Number: 980011368-100 Revision: A1 Bill of Material Item Part Number Part Description 1 551011368-001 LM4838 Eval Board PCB 10 482911368-001 LM4838 28L LLP 20 151911368-001 Cer Cap 0.068µF 50V 10% 25 152911368-001 Tant Cap 0.1µ ...

  • Page 27

    Recommended Printed Circuit Board Layout - MT/MTE Packages Top Layer SilkScreen + Pad - ( Not to Scale ) Top Layer - Not to scale - ( Not to Scale ) 27 DS200134-84 DS200134-85 www.national.com ...

  • Page 28

    Layer 2 - Not to scale - ( Not to Scale ) Layer Not to scale ) 28 DS200134-86 DS200134-87 ...

  • Page 29

    Bottom Layer - ( Not to scale ) 29 DS200134-88 www.national.com ...

  • Page 30

    ... Analog Audio LM4839 MSOP Eval Board Assembly Part Number: 980011373-100 Revision: A Bill of Material Item Part Number Part Description 1 551011373-001 LM4839 Eval Board PCB 10 482911373-001 20 151911368-001 Cer Cap 0.068µF 50V 10% 25 152911368-001 Tant Cap 0.1µF 10V 10% 26 152911368-002 Tant Cap 0.33µF 10V 10% ...

  • Page 31

    ... Physical Dimensions inches (millimeters) unless otherwise noted NS Package Number LQA028AA For Exposed-DAP LLP LLP Package Order Number LM4839LQ 31 www.national.com ...

  • Page 32

    ... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) TSSOP Package Order Number LM4839MT NS Package Number MTC28 for TSSOP 32 ...

  • Page 33

    ... Physical Dimensions inches (millimeters) unless otherwise noted (Continued) NS Package Number MXA28A for Exposed-DAP TSSOP Exposed-DAP TSSOP Package Order Number LM4839MTE 33 www.national.com ...

  • Page 34

    ... 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 ...