LM4832N National Semiconductor, LM4832N Datasheet

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LM4832N

Manufacturer Part Number
LM4832N
Description
Digitally Controlled Tone and Volume Circuit with Stereo Audio Power Amplifier, Microphone Preamp Stage and National 3D Sound
Manufacturer
National Semiconductor
Datasheet

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© 2003 National Semiconductor Corporation
LM4832
Digitally Controlled Tone and Volume Circuit with Stereo
Audio Power Amplifier, Microphone Preamp Stage and
National 3D Sound
General Description
The LM4832 is a monolithic integrated circuit that provides
volume and tone (bass and treble) controls as well as a
stereo audio power amplifier capable of producing 250 mW
(typ) into 8Ω or 90 mW (typ) into 32Ω with less than 1.0%
THD. In addition, a two input microphone preamp stage, with
volume control, capable of driving a 1 kΩ load is imple-
mented on chip.
The LM4832 also features National’s 3D Sound circuitry
which can be externally adjusted via a simple RC network.
For maximum system flexibility, the LM4832 has an exter-
nally controlled, low-power consumption shutdown mode,
and an independent mute for power and microphone ampli-
fiers .
Boomer
to provide high quality audio while requiring few external
components. Since the LM4832 incorporates tone and vol-
ume controls, a stereo audio power amplifier and a micro-
phone preamp stage, it is optimally suited to multimedia
monitors and desktop computer applications.
Block Diagram
Boomer
®
is a registered trademark of National Semiconductor Corporation.
®
audio integrated circuits were designed specifically
DS100014
FIGURE 1. LM4832 Block Diagram
Key Specifications
n Output Power at 10% into 8Ω
n Output Power at 10% into 32Ω
n THD+N at 75mW into 32Ω at 1kHz
n Microphone Input Referred Noise
n Supply Current
n Shutdown Current
Features
n Independent Left and Right Output Volume Controls
n Treble and Bass Control
n National 3D Sound
n I
n Two Microphone Inputs with Selector
n Software Controlled Shutdown Function
Applications
n Multimedia Monitors
n Portable and Desktop Computers
2
C Compatible Interface
10001401
December 2003
www.national.com
350mW (typ)
100mW (typ)
0.5% (max)
13mA (typ)
7µV (typ)
4µA (typ)

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LM4832N Summary of contents

Page 1

... Block Diagram Boomer ® registered trademark of National Semiconductor Corporation. © 2003 National Semiconductor Corporation Key Specifications n Output Power at 10% into 8Ω n Output Power at 10% into 32Ω n THD+N at 75mW into 32Ω at 1kHz ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature Soldering Information Small Outline Package Vapor Phase (60 sec ...

Page 3

Electrical Characteristics for Entire IC The following specifications apply for V Symbol Parameter P Output Power O THD+N Total Harmonic Distortion+Noise PSRR Power Supply Rejection Ratio A Mute Attenuation M X Cross Talk TALK MICROPHONE PREAMP AND VOLUME CONTROL A ...

Page 4

Electrical Characteristics for Entire IC The following specifications apply for V Symbol Parameter V Input High Voltage IH I Input Current IN V Output Voltage — SDA Acknowledge O V External Power Amp Disable Low OL V External Power Amp ...

Page 5

... Typical Application Circuit Connection Diagram FIGURE 2. Typical Application Circuit 10001402 Top View Order Number LM4832N, LM4832M See NS Package Number N28B for DIP See NS Package Number M28B for SOIC See NS Package Number MTC28 for TSSOP 5 10001403 www.national.com ...

Page 6

Pin Descriptions Pin Name LEFT 3D (1) RIGHT 3D (28) BYPASS (2) POWER AMP OUT LEFT (3) RIGHT (26) POWER GND (4) LOOP OUT (8, 21) LOOP IN (5, 24) TONE OUT (6, 23) TONE IN (7, 22) INPUTS (9, ...

Page 7

Typical Performance Characteristics THD+N vs Frequency, 8Ω THD+N vs Frequency, 1 kΩ THD+N vs Output Power 10001404 10001406 10001408 7 THD+N vs Frequency, 32Ω 10001405 THD+N vs Output Power 10001407 THD+N vs Output Power 10001409 www.national.com ...

Page 8

Typical Performance Characteristics Power Amplifier Crosstalk Power Amplifier Attenuation vs Frequency Power Dissipation vs Output Power www.national.com (Continued) 10001410 10001412 10001414 8 Power Amplifier Noise Floor 10001411 Power Supply Rejection Ratio 10001413 Power Derating Curve 10001415 ...

Page 9

Typical Performance Characteristics Mic Amplifer Crosstalk from Power Amplifier Mic Amplifier Attenuation vs Frequency Mic Amplifier THD+N vs Frequency (Continued) 10001416 10001418 10001420 9 Mic Amplifier Noise Floor 10001417 Mic Amplifier Gain vs Frequency 10001419 Loop-out THD+N vs Frequency 10001421 ...

Page 10

Typical Performance Characteristics Bass Response vs Frequency Bass and Treble Response vs Frequency www.national.com (Continued) 10001422 10001424 10 Treble Response vs Frequency 10001423 Supply Current vs Temperature 10001425 ...

Page 11

Timing Diagrams See Electrical Characteristics section for timing specifications 2 FIGURE Bus Format 2 FIGURE Timing Diagram 11 10001426 10001427 www.national.com ...

Page 12

Truth Tables SOFTWARE SPECIFICATION MSB 1 0 *E.C. = Externally Configuarable MSB MSB ...

Page 13

Truth Tables (Continued) MSB ...

Page 14

Truth Tables (Continued) MSB Right Volume Control Power Up State MSB ...

Page 15

Application Information GROUNDING In order to achieve the best possible performance, certain grounding techniques should be followed. All input reference grounds should be tied with their respective source grounds and brought back to the power supply ground separately from the ...

Page 16

Application Information INTERFACE The LM4832 uses a serial bus, which conforms to the I protocol, to control the chip’s functions with two wires: clock and data. The clock line is uni-directional. The data line is bi-directional(open-collector) with ...

Page 17

Application Information GENERAL PURPOSE OUTPUT PIN The General Purpose Output pin is intended to be used as a control signal for other devices, such as an external power amplifier. This pin is controlled through the I is not relatedto any ...

Page 18

Application Information www.national.com (Continued) FIGURE 8. 18 10001431 ...

Page 19

Application Information Name Capacitors C10 C11 C12 C13 C14 C15 C16 Resistors: RPD RDGND Connectors: HDR 2X1 DB25SL connector - male LAYOUT DESCRIPTION The layout given in ...

Page 20

Typical Application PCB Layout Top Silkscreen Layer Bottom Layer www.national.com 10001438 10001436 20 10001437 Top Layer ...

Page 21

Physical Dimensions inches (millimeters) unless otherwise noted 28-Lead SOIC Package (M28B) Order Number LM4832M NS Package Number M28B for SOIC 21 www.national.com ...

Page 22

... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) 28-Lead Dual-In-Line Package (N28B) Order Number LM4832N NS Package Number N28B for DIP 22 ...

Page 23

... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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