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MAX98355AEWL+

更新时间： 2024-09-17 11:52:43
品牌 Logo 应用领域
美信 - MAXIM 放大器功率放大器PC
页数 文件大小 规格书
34页 3629K
描述
PCM Input Class D Audio Power Amplifiers

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19-6278; Rev 0; 5/12  
E V A L U A T I O N K I T A V A I L A B L E  
General Description  
Features  
The MAX98355A/MAX98355B are digital pulse-code  
modulation (PCM) input Class D power amplifiers that  
provide Class AB audio performance with Class D effi-  
ciency. These ICs offer five selectable gain settings  
(3dB, 6dB, 9dB, 12dB, and 15dB) set by a single gain-  
select input (GAIN).  
S Single-Supply Operation (2.5V to 5.5V)  
S 3.2W Output Power into 4I at 5V  
S 2.2mA Quiescent Current  
S 92% Efficiency (R = 8I, P  
= 900mW,  
L
OUT  
V
DD  
= 3.7V)  
The digital audio interface is highly flexible with the  
MAX98355A supporting I2S data and the MAX98355B  
supporting left-justified data. Both ICs support time divi-  
sion multiplexed (TDM) data. The digital audio interface  
accepts sample rates ranging from 8kHz to 96kHz for all  
supported data formats. The ICs can be configured to  
produce a left channel, right channel, or (left + right)/2  
output from the stereo input data. The ICs operate using  
16/24/32-bit data for I2S and left justified modes as well  
as 16-bit data with up to four slots when using TDM  
mode. The ICs eliminate the need for the external MCLK  
signal that is typically used for PCM communication. This  
reduces EMI and possible board coupling issues in addi-  
tion to reducing the size and pin count of the ICs.  
S 25µV  
Output Noise (A = 15dB)  
V
RMS  
S Low 0.013% THD+N at 1kHz  
S No MCLK Required  
S Sample Rates of 8kHz to 96kHz  
S Supports Left, Right, or (Left + Right)/2 Outputs  
S Sophisticated Edge Rate Control Enables  
Filterless Class D Outputs  
S 77dB PSRR at 217Hz  
S Low RF Susceptibility Rejects TDMA  
Noise from GSM Radios  
The ICs also feature a very high wideband jitter tolerance  
(12ns typ) on BCLK and LRCLK to provide robust operation.  
S Extensive Click-and-Pop Reduction Circuitry  
S Robust Short-Circuit and Thermal Protection  
Active emissions-limiting, edge-rate limiting, and over-  
shoot control circuitry greatly reduce EMI. A filterless  
spread-spectrum modulation scheme eliminates the  
need for output filtering found in traditional Class D  
devices and reduces the component count of the solution.  
S Available in Space-Saving Package:  
1.345mm x 1.435mm WLP (0.4mm Pitch)  
The ICs are available in a 9-pin WLP package (1.345mm  
x 1.435mm x 0.64mm) and are specified over the -40NC  
to +85NC temperature range.  
Simplified Block Diagram  
Applications  
Cellular Phones  
Tablets  
SHUTDOWN  
AND  
CHANNEL  
SELECT  
GAIN  
CONTROL  
MAX98355A  
MAX98355B  
Portable Media Players  
Notebook Computers  
CLASS D  
OUTPUT  
STAGE  
DIGITAL  
AUDIO  
INTERFACE  
PCM  
INPUT  
Ordering Information appears at end of data sheet.  
Functional Diagram appears at end of data sheet.  
DAC  
For related parts and recommended products to use with this part,  
refer to www.maxim-ic.com/MAX98355A.related.  
����������������������������������������������������������������� Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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