LM4857

Manufacturer Part NumberLM4857
ManufacturerTexas Instruments
LM4857 datasheet
 


Specifications of LM4857

Speaker ChannelsStereoSpeaker Output Power/ch(w)1.2
Speaker Psrr(db)70Headphone Output Power/ch(mw)75
Headphone Psrr(db)86Audio Mode ControlI2C
Supply Voltage(min)(v)2.7Supply Voltage(max)(v)5.5
Pin/package28QFN, 28UQFN, 28WQFN, 30DSBGA  
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LM4857
LM4857 Stereo 1.2W Audio Sub-system with 3D Enhancement
Literature Number: SNAS229H

LM4857 Summary of contents

  • Page 1

    ... LM4857 LM4857 Stereo 1.2W Audio Sub-system with 3D Enhancement Literature Number: SNAS229H ...

  • Page 2

    ... Boomer audio power amplifiers are designed specifically to provide high quality output power with a minimal amount of external components. The LM4857 is available in a 30-bump ITL package and a 28–lead LLP package. Boomer ® registered trademark of National Semiconductor Corporation. ...

  • Page 3

    Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit www.national.com 2 20079708 ...

  • Page 4

    ... Mono Earpiece Negative Output LLS+ Left Loudspeaker Positive Output V Power Supply DD RLS3D Right Loudspeaker 3D L Left Stereo Input IN LHP Left Headphone Output 3 micro SMD Marking 200797I3 Top View X — Date Code T — Die Traceability G — Boomer Family C2 — LM4857ITL Pin Description www.national.com ...

  • Page 5

    ... Connection Diagram www.national.com 28 – Lead SP Package Top View Order Number LM4857SP See NS Package Number SPA28A 4 20079799 ...

  • Page 6

    Pin Connection (SP) Pin Name RHP Right Headphone Output V Power Supply ...

  • Page 7

    ... SE Speaker; LD5 = RD5 = 0 Earpiece; LD5 = RD5 = 0 6 62˚C/W 42˚C/W 3˚C/W −40˚C ≤ T ≤ +85˚C MAX A 2.7V ≤ V ≤ 5.5V DD 2.5V ≤ I ≤ 5. (Notes 25˚C. A LM4857 Units (Limits) Typical Limits (Notes (Note 9.5 mA (max (max (max) 0.2 3 µA (max) 1.6 W 1.2 ...

  • Page 8

    ... A LM4857 Typical Limits (Notes (Note 5 (max) 4.5 7.5 mA (max) 11 (max) 0.06 2.5 µA (max) 530 www.national.com Units (Limits) µV µV µV µV µV µV µV µV µ ...

  • Page 9

    ... Speaker; Mode 12, 13, Headphone; Mode Headphone; Mode 13, 14 Earpiece; Mode1 Earpiece; Mode 6 Earpiece; Mode 11 Line Out; Mode 5 Line Out; Mode 10 Line Out; Mode 15 8 (Notes 1, 2) (Continued) = 25˚C. A LM4857 Units (Limits) Typical Limits (Notes (Note 400 320 mW (min (min) ...

  • Page 10

    ... Limits DD LM4857 (Limits) Typical Limits (Notes (Note 2.5 µs (min) 100 ns (min (min) 100 ns (min) www.national.com Units dB ...

  • Page 11

    ... LM4857SP mounted on a PCB with a 2in JA www.national.com (Notes 1, 2) (Continued and 2.5V ≤ and Conditions ) / θ the number given in Absolute Maximum Ratings, whichever is lower. For the LM4857 operating in Mode area of 1oz printed circuit board copper ground plane and R set at 0dB area of 1oz printed circuit board ground plane ...

  • Page 12

    ... Mode 7; 0dB Gain L Functional Description also creates a highpass filter with the internal resistor 1/(2π pin voltage and helps maintain the LM4857’ also creates a high pass filter with R L OUT . 3D (Note 11) LM4857SP THD+N vs Frequency 20079755 V 11 ...

  • Page 13

    ... Mode 7; 0dB Gain L THD+N vs Frequency V = 5V; LLS, RLS 8Ω; Mode 7; 0dB Gain L www.national.com (Note 11) (Continued) 20079757 20079710 = 400mW LM4857SP THD+N vs Output Power 20079758 V = 3V; LLS, RLS 1kHz 4Ω; Mode 7; 0dB Gain L THD+N vs Frequency 20079711 V = 3V; LLS, RLS 200mW 8Ω ...

  • Page 14

    Typical Performance Characteristics THD+N vs Frequency V = 5V; LHP, RHP 32Ω; Mode 9; 0dB Gain L THD+N vs Frequency V = 5V; EP 15mW 32Ω; Mode 1; 0dB ...

  • Page 15

    Typical Performance Characteristics THD+N vs Frequency V = 5V; LINEOUT 5kΩ; Mode 5; 0dB Gain L THD+N vs Frequency V = 5V; LINEOUT 5kΩ; Mode 10; 0dB Gain L www.national.com (Note 11) ...

  • Page 16

    Typical Performance Characteristics THD+N vs Output Power V = 5V; LLS, RLS 1kHz 8Ω; Mode 7; 0dB Gain L THD+N vs Output Power V = 5V; LHP, RHP 1kHz 32Ω; ...

  • Page 17

    Typical Performance Characteristics THD+N vs Output Power V = 5V; EP 1kHz Mode 1; 0dB Gain; Top-CD4 = 1; Bot-CD4 = 0 PSRR vs Frequency V = 5V; LLS, RLS 8Ω; 0db Gain; DD ...

  • Page 18

    Typical Performance Characteristics PSRR vs Frequency V = 5V; LHP, RHP 32Ω; 0db Gain All audio inputs terminated Top-Mode 13, 14; Mid-Mode 3, 4; Bot-Mode 8, 9 PSRR vs Frequency V = 5V; EP ...

  • Page 19

    Typical Performance Characteristics PSRR vs Frequency V = 5V; LINEOUT 5kΩ; 0db Gain All audio inputs terminated Top-Mode 15; Mid-Mode 10; Bot-Mode 5 Crosstalk vs Frequency V = 5V; LLS, RLS 400mW ...

  • Page 20

    Typical Performance Characteristics Crosstalk vs Frequency V = 5V; LHP, RHP 15mW Mode 9; 0db Gain; 3D off Top-Left to Right; Bot- Right to Left Frequency vs Response LLS, RLS 8Ω; L Mode ...

  • Page 21

    Typical Performance Characteristics Frequency vs Response LHP, RHP 32Ω Mode 4; Full Gain Frequency vs Response EP 32Ω; Mode 1; Full Gain L Top-CD4 = 1; Bot-CD4 = 0 www.national.com (Note 11) (Continued) 20079740 ...

  • Page 22

    Typical Performance Characteristics Frequency vs Response LINEOUT 5kΩ Mode 10; Full Gain Power Dissipation vs Output Power = 32Ω; THD+N ≤ 1% LHP, RHP Top-V = 5V; Bot per channel (Note ...

  • Page 23

    Typical Performance Characteristics Output Power vs Load Resistance LLS, RLS 8Ω; L Top-V = 5V, 10% THD+N; Topmid-V DD Botmid-V = 3V, 10% THD+N; Bot-V DD Output Power vs Load Resistance EP 32Ω; CD4 = 0 ...

  • Page 24

    Typical Performance Characteristics Output Power vs Supply Voltage LLS, RLS 8Ω; L Top–10% THD+N; Bot–1% THD+N Output Power vs Supply Voltage EP 32Ω; L Top–10% THD+N; CD4 = 1; Topmid–1% THD+N, CD4 = 1 Botmid–10% THD+N; ...

  • Page 25

    Application Information A7 A6 Chip Address 1 ADR = 0 1 ADR = externally configured by ADR pin Mono Volume control Left Volume control Right Volume control Mode control www.national.com 2 FIGURE Bus ...

  • Page 26

    Application Information MD4 MD3 ...

  • Page 27

    Application Information LD4//RD4 LD3//RD3 ...

  • Page 28

    Application Information Mode CD3 CD2 CD1 CD0 Mono Line Out MUTE MUTE MUTE MUTE ...

  • Page 29

    ... If the data line is not held low during the acknowledge clock pulse, then the mas- ter should abort the rest of the data transfer to the LM4857. The 8 bits of data are sent next, most significant bit first. ...

  • Page 30

    ... PCB layer, a nominal 2in for 5V operation with a 4Ω load. Heatsink areas not placed on the same PCB layer as the LM4857 should be 4in same supply voltage and load resistance. The last two area recommendations apply for 25˚C ambient temperature. In- crease the area to compensate for ambient temperatures above 25˚ ...

  • Page 31

    ... LM4857’s supply pins and ground. Keep the length of leads (Continued) and traces that connect capacitors between the LM4857’s power supply pin and ground as short as possible. ...

  • Page 32

    Application Information depends on desired PSRR requirements, click and pop per- formance, wake-up time, system cost, and size constraints. FIGURE 4. Reference Design Board Schematic (Continued) 31 20079709 www.national.com ...

  • Page 33

    Demonstration Board ITL PCB Layout Recommended ITL PCB Layout: Top Silkscreen Recommended ITL PCB Layout: Inner Layer 1 www.national.com 20079707 Recommended ITL PCB Layout: 20079704 Recommended ITL PCB Layout: Inner Layer 2 32 20079706 Top Layer 20079705 ...

  • Page 34

    Demonstration Board ITL PCB Layout (Continued) 20079703 Recommended ITL PCB Layout: Bottom Layer 33 www.national.com ...

  • Page 35

    Demonstration Board SP PCB Layout Recommended SP PCB Layout: Top Over Layer Recommended SP PCB Layout: Mid Layer www.national.com 200797I9 Recommended SP PCB Layout: 200797I7 Recommended SP PCB Layout: Bottom Layer 34 200797I8 Top Layer 200797I6 ...

  • Page 36

    Revision History Rev 1.1 1.2 Date 6/03/05 Changed the numerical value of 20 into 9 in the last paragraph of "NATIONAL 3D ENHANCEMENT (per Alvin F.), then re-released D/S to the WEB. 6/07/05 Deleted all references on GR pkg (GR ...

  • Page 37

    ... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 30-Bump micro SMD Order Number LM4857ITL NS Package Number TLA30CZA ± ± 2.543 0. 2.949 0. ± = 0.6 0.075 3 ...

  • Page 38

    ... Deutsch Tel: +49 (0) 69 9508 6208 English www.national.com Français Tel: +33 ( 8790 28 — Lead SP Package Order Number LM4857SP NS Package Number SPA28A 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 affect its safety or effectiveness ...

  • Page 39

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...