LM48557

Manufacturer Part NumberLM48557
ManufacturerTexas Instruments
LM48557 datasheet
 


Specifications of LM48557

Supply Min(min)(volt)1.7Supply Max(max)(volt)4.5
Voltage Output Pk To Pk(v)16.4Pin/package16DSBGA
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LM48557
LM48557 Mono, Bridge-Tied Load, Ceramic Speaker Driver with I2C Volume
Controland Reset
Literature Number: SNAS486C

LM48557 Summary of contents

  • Page 1

    ... LM48557 LM48557 Mono, Bridge-Tied Load, Ceramic Speaker Driver with I2C Volume Controland Reset Literature Number: SNAS486C ...

  • Page 2

    ... Flexible power supply requirements allow operation from 2.7V to 4.5V. The LM48557 features an active low reset input that reverts the device to its default state. Additionally, the LM48557 features a 36-step I ...

  • Page 3

    Typical Application www.national.com FIGURE 1. Typical Audio Amplifier Application Circuit 2 30098103 ...

  • Page 4

    ... Connection Diagrams TL Package 1.965mm x 1.965mm x 0.6mm Top View Order Number LM48557TL See NS Package Number TLA1611A Ordering Information Order Number Package LM48557TL 16–Bump micro SMD LM48557TLX 16–Bump micro SMD 16–Bump micro SMD Marking 30098112 Package DWG # Transport Media TLA1611A 250 units on tape and reel ...

  • Page 5

    ... UR Package 1.965mm x 1.965mm x 0.35mm Top View Order Number LM48557UR See NS Package Number URA1611A Ordering Information Order Number Package LM48557UR 16–Bump micro SMD LM48557URX 16–Bump micro SMD www.national.com 16–Bump micro SMD Marking 30098112 Package DWG # Transport Media URA1611A 250 units on tape and reel ...

  • Page 6

    Bump Descriptions Bump Name SGND A3 VCM A4 B1 OUT- B2 OUT+ B3 RESET B4 C1 CPV C2 C3 SDA C1N D2 PGND Signal Power Supply DD Signal Ground Common ...

  • Page 7

    ... THD 1kHz f = 5kHz R = 2.2µF + 10Ω, THD 1kHz f = 5kHz 1kHz 48dB O RMS V 6 ≤ ≤ −40° MAX ≤ 2. ≤ 1. LM48557 Min Typ Max (Note 7) (Note 6) (Note 7) 2.7 4.5 1 160 1.4 0.4 -25.5 -25 -24 – 5.5 5.8 15 ...

  • Page 8

    ... DD 7 LM48557 Min Typ Max (Note 7) (Note 6) (Note 230 300 370 The following specifications LM48557 Min Typ Max (Note 6) (Note 0 0.35 2 400 100 0 250 900 100 100 www.national.com Units ...

  • Page 9

    Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond ...

  • Page 10

    Typical Performance Characteristics THD+N vs Frequency V = 3.6V 1µF + 22Ω 48dB 2. THD+N vs Output Voltage Z = 1µF + 22Ω Power Consumption vs Output ...

  • Page 11

    CMRR vs Frequency V = 4.2V 200mV DD RIPPLE Output Voltage vs Supply Voltage Z = 1µF + 22Ω, THD Charge Pump Output Voltage vs Load Current V = 4.2V DD www.national.com , A = ...

  • Page 12

    ... The 7-bit device address is written to the bus, most significant bit (MSB) first, followed by the R/W bit. Set R the LM48557 is a WRITE-ONLY device and will not respond to R other words, the LM48557 will not issue an ACK when R Each address bit is latched in on the rising 2 C compatible serial edge of the clock ...

  • Page 13

    B7 Device 1 Address Register B7 Name Mode 0 Control Volume 1 Control BIT NAME B0 SHDN B1 MUTE B2 RESERVED* B3 RESERVED* B4 TESTMODE B5 RESERVED* B6 RESERVED* REGISTER B7 ADDRESS *RESERVED bits are Don't Cares and are ignored ...

  • Page 14

    ... LM48557’s ACK, the master device does not issue a STOP condition, transmitting a second data byte instead. The LM48557 responds with an ACK bit. The master device can continue to issue data bytes, and the LM48557 will respond with an ACK, until a STOP condition is issued. Once a STOP condition is issued, the LM48557 ignores the I master issues the LM48557’ ...

  • Page 15

    VOLUME VOL5 STEP 1 0 (MUTE ...

  • Page 16

    VOLUME VOL5 VOL4 STEP ...

  • Page 17

    ... VOLUME CONTROL The LM48557 has a 64 step volume control, but only 36 steps are recommended for use. Use steps 1 through 32 and steps 61 through 64 to set the gain of the device. Accessing steps 33 through 60 results in the repeated gain conditions shown in Table 6. Steps 33 through 60 are not tested and should not be used ...

  • Page 18

    ... FIGURE 9. Single-Ended Input Configuration with a Ground-Referenced Source NON-GROUND REFERENCED AUDIO SOURCE Stereo-to-Mono Conversion The LM48557 can convert a single-ended stereo signal to a mono BTL signal (Figure 10). Connect the left and right FIGURE 10. Single-Ended Stereo-to-Mono BTL Conversion CODEC output, and connect the unused input and VCM to the CODEC output ground (Figure 9) ...

  • Page 19

    ... Minimize trace impedance of the power, ground and all output traces for optimum performance. Voltage loss due to trace resistance between the LM48557 and the load results in de- creased output power and efficiency. Trace resistance be- tween the power supply and ground has the same effect as a poorly regulated supply, increased ripple and reduced peak output power ...

  • Page 20

    PC Board Layout Silk Screen Layer 2 30098125 Top Layer 30098122 19 30098124 30098123 Layer 3 www.national.com ...

  • Page 21

    Bottom Layer www.national.com 30098120 Bottom Silkscreen 20 30098121 ...

  • Page 22

    ... Demo Board Schematic FIGURE 11. LM48557 Demo Board Schematic 21 30098119 www.national.com ...

  • Page 23

    ... Revision History Rev Date 1.0 07/08/09 1.01 07/15/09 1.02 08/05/09 1.03 08/06/09 1.04 01/11/10 www.national.com Description Initial released. Deleted the “Tru-GND...” trademark on the cover page. Text edits. Fixed a typo error. Added the LM48557UR package drawing, top markings, and the marketing outline. 22 ...

  • Page 24

    ... Physical Dimensions inches (millimeters) unless otherwise noted X 16-Bump micro SMD Order Number LM48557TL NS Package Number TLA1611A = 1.965± 0. 1.965 ± 0. 0.6 ± 0.075 www.national.com ...

  • Page 25

    Package Preview 16–Bump micro SMD NS Package Number URA16XXX X = 1.965 ± 0. 1.965 ± 0. 0.350 ± 0.045 ...

  • Page 26

    Notes 25 www.national.com ...

  • Page 27

    For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs ...

  • Page 28

    ... 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’ ...