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MAX98355B Datasheet

Download or read online Maxim Integrated MAX98355B PCM Input Class D Audio Power Amplifier pdf datasheet.



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PCM Input Class D Audio Power Amplifiers
General Description
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).
The digital audio interface is highly flexible with the
2
MAX98355A supporting I
S 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
2
16/24/32-bit data for I
S 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.
The ICs also feature a very high wideband jitter tolerance
(12ns typ) on BCLK and LRCLK to provide robust operation.
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.
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.
Applications
Cellular Phones
Tablets
Portable Media Players
Notebook Computers
Ordering Information
appears at end of data sheet.
Functional Diagram
appears at end of data sheet.
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.
E V A L U A T I O N K I T A V A I L A B L E
MAX98355A/MAX98355B
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
= 3.7V)
DD
S 25µV
Output Noise (A
= 15dB)
RMS
V
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
S Extensive Click-and-Pop Reduction Circuitry
S Robust Short-Circuit and Thermal Protection
S Available in Space-Saving Package:
1.345mm x 1.435mm WLP (0.4mm Pitch)
Simplified Block Diagram
SHUTDOWN
AND
MAX98355A
CHANNEL
MAX98355B
SELECT
DIGITAL
PCM
DAC
AUDIO
INPUT
INTERFACE
19-6278; Rev 0; 5/12
Features
GAIN
CONTROL
CLASS D
OUTPUT
STAGE

Summary of Contents

Page 1

... PCM Input Class D Audio Power Amplifiers General Description 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) ...

Page 2

... Class D Speaker Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Ultra-Low EMI Filterless Output Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Speaker Current Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Gain Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Click-and-Pop Suppression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Applications Information Filterless Class D Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Power-Supply Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Layout and Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 WLP Applications Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Functional Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Package Information Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 ___ Maxim Integrated Products 2 MAX98355A/MAX98355B TABLE OF CONTENTS ...

Page 3

... PCM Input Class D Audio Power Amplifiers 2 Figure Audio Interface Timing Diagram (MAX98355A Figure 2. Left-Justified Audio Interface Timing Diagram (MAX98355B Figure 3. TDM Audio Interface Timing Diagram Figure 4. MAX98355A I S Digital Audio Interface Timing, 16-Bit Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2 Figure 5. MAX98355A I S Digital Audio Interface Timing, 24-Bit Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2 Figure 6 ...

Page 4

... Standby Current I STNDBY Turn-On Time Output Offset Voltage Click-and-Pop Level Power-Supply Rejection Ratio ___ Maxim Integrated Products 4 MAX98355A/MAX98355B Continuous Power Dissipation (T WLP (derate 13.7mW/NC above 70NC)...1096mW 0.3V) DD Junction Temperature ...150NC Operating Temperature Range ... -40NC to 85NC Storage Temperature Range ... -65NC to 150NC .. ...Continuous DD Soldering Temperature (reflow) ...

Page 5

... Frequency Response DAC DIGITAL FILTERS VOICE MODE IIR LOWPASS FILTER (LRCLK < 30kHz) Passband Cutoff Stopband Cutoff Stopband Attenuation ___ Maxim Integrated Products 5 MAX98355A/MAX98355B (6dB). BCLK 3.072MHz, LRCLK 48kHz, speaker loads (Z , unless otherwise noted. Typical values are at T MAX CONDITIONS 33FH ...

Page 6

... BCLK and LRCLK Jitter Maximum High Frequency BCLK and LRCLK Jitter Input High Voltage Input Low Voltage ___ Maxim Integrated Products 6 MAX98355A/MAX98355B (6dB). BCLK 3.072MHz, LRCLK 48kHz, speaker loads (Z , unless otherwise noted. Typical values are at T MAX CONDITIONS Ripple limit cutoff ...

Page 7

... Note 3: Class D amplifier testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For 68FH. For 4I Note 4: Digital silence used for input signal. ___ Maxim Integrated Products 7 MAX98355A/MAX98355B (6dB). BCLK 3.072MHz, LRCLK 48kHz, speaker loads (Z , unless otherwise noted. Typical values are at T MAX CONDITIONS 0V ...

Page 8

... DIN (INPUT) LSB 2 Figure Audio Interface Timing Diagram (MAX98355A) BCLK (INPUT) LRCLK (INPUT) DIN (INPUT) LSB Figure 2. Left-Justified Audio Interface Timing Diagram (MAX98355B) BCLK (INPUT) t SYNCSET LRCLK (INPUT) DIN (INPUT) LSB MAX98355A Figure 3. TDM Audio Interface Timing Diagram ___ Maxim Integrated Products 8 ...

Page 9

... OUTPUT POWER (W) ___ Maxim Integrated Products 9 MAX98355A/MAX98355B Typical Operating Characteristics (6dB). BCLK 3.072MHz, LRCLK 48kHz, speaker loads (Z , unless otherwise noted. Typical values are at T MAX General 4.0 4.5 5.0 5.5 Speaker Amplifier TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER ...

Page 10

... P 350mW OUT -90 -100 10 100 1k 10k FREQUENCY (Hz) ___ Maxim Integrated Products 10 MAX98355A/MAX98355B Typical Operating Characteristics (continued) (6dB). BCLK 3.072MHz, LRCLK 48kHz, speaker loads (Z , unless otherwise noted. Typical values are at T MAX TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER 4.2V DD -10 GAIN 12dB ...

Page 11

... SPK LOAD 1.5 THDN 10% 1.0 0.5 THD LOAD ( I ) ___ Maxim Integrated Products 11 MAX98355A/MAX98355B Typical Operating Characteristics (continued) (6dB). BCLK 3.072MHz, LRCLK 48kHz, speaker loads (Z , unless otherwise noted. Typical values are at T MAX TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 4.2V DD -10 GAIN 12dB ...

Page 12

... 68µH SPK 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 OUTPUT POWER PER CHANNEL (W) ___ Maxim Integrated Products 12 MAX98355A/MAX98355B Typical Operating Characteristics (continued) (6dB). BCLK 3.072MHz, LRCLK 48kHz, speaker loads (Z , unless otherwise noted. Typical values are at T MAX OUTPUT POWER vs. SUPPLY VOLTAGE 4.0 GAIN 12dB 3 33µH SPK 3 ...

Page 13

... 68µH SPK 0 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) ___ Maxim Integrated Products 13 MAX98355A/MAX98355B Typical Operating Characteristics (continued) (6dB). BCLK 3.072MHz, LRCLK 48kHz, speaker loads (Z , unless otherwise noted. Typical values are at T MAX EFFICIENCY vs. OUTPUT POWER 100 ...

Page 14

... FREQUENCY (kHz) ___ Maxim Integrated Products 14 MAX98355A/MAX98355B Typical Operating Characteristics (continued) (6dB). BCLK 3.072MHz, LRCLK 48kHz, speaker loads (Z , unless otherwise noted. Typical values are at T MAX INBAND OUTPUT SPECTRUM 20 BCLK 5.6448MHz 0 LRCLK 88.2kHz Z SPK -20 ...

Page 15

... FREQUENCY (kHz) ___ Maxim Integrated Products 15 MAX98355A/MAX98355B Typical Operating Characteristics (continued) (6dB). BCLK 3.072MHz, LRCLK 48kHz, speaker loads (Z , unless otherwise noted. Typical values are at T MAX f 2.048MHz BCLK f 32kHz LRCLK 68µH SPK 10 12 ...

Page 16

... Bit Clock Input Signal. BCLK must be 32, 48 LRCLK. Valid frequency range: 256kHz6.144MHz. C2 GND Ground C3 LRCLK Left/Right Word Clock Input. Valid frequency range: 8kHz96kHz. ___ Maxim Integrated Products 16 MAX98355A/MAX98355B TOP VIEW BUMP SIDE DOWN MAX98355A MAX98355B SD_MODE V OUTP DIN GAIN OUTN ...

Page 17

... When operating in I data is always clocked-in on the rising edge of BCLK. In TDM mode, the MAX98355A clocks-in serial data on the rising edge of BCLK while the MAX98355B clocks in serial data on the falling edge of BCLK LRCLK specifies whether left-channel data or right- channel data is currently being read by the digital audio interface ...

Page 18

... The MAX98355A follows standard I a delay of one BCLK cycle after the LRCLK transition before the beginning of a new data word Figure 5). The MAX98355B follows the left justified timing specification by aligning the LRCLK transitions with the beginning of a new data word (Figure 6 ...

Page 19

I S: 24-BIT DATA, 32 BITS/CHANNEL, SD_MODE LOGIC-HIGH LRLCK LEFT BCLK DIN D23 D22 D21 D20 D19 D18 D17 D16 D15 D14 D13 D12 D11 D10 ...

Page 20

... BCLK DIN D15 D14 D13 D12 D11 D10 D15 D14 D13 D12 D11 D10 D15 D14 Figure 6. MAX98355B Left-Justified Digital Audio Interface Timing, 16-Bit Resolution ___ Maxim Integrated Products 20 MAX98355A/MAX98355B LEFT ...

Page 21

LEFT JUSTIFIED: 24-BIT DATA, 32 BITS/CHANNEL, SD_MODE LOGIC-HIGH LRCLK LEFT BCLK DIN D23 D22 D21 D20 D19 D18 D17 D16 D15 D14 D13 D12 D11 D10 LEFT JUSTIFIED: 24-BIT ...

Page 22

... TDM: 16-BIT DATA, 32-BIT FRAME, SD_MODE PULLUP THROUGH L15 L14 L13 L12 L11 L10 L9 IGNORED TDM: 16-BIT DATA, 32-BIT FRAME, SD_MODE PULLUP THROUGH R L15 L14 L13 L12 L11 L10 L9 Figure 8. MAX98355A TDM Digital Audio Interface Timing ___ Maxim Integrated Products 22 MAX98355A/MAX98355B ...

Page 23

... TDM: 16-BIT DATA, 32-BIT FRAME, SD_MODE PULLUP THROUGH L15 L14 L13 L12 L11 L10 L9 IGNORED TDM: 16-BIT DATA, 32-BIT FRAME, SD_MODE PULLUP THROUGH R L15 L14 L13 L12 L11 L10 L9 Figure 9. MAX98355B TDM Digital Audio Interface Timing ___ Maxim Integrated Products 23 MAX98355A/MAX98355B ...

Page 24

TDM: 64-BIT DATA, 64-BIT FRAME, SD_MODE LOGIC-HIGH LRCLK BCLK DIN Y1 Y0 L15 L14 L13 L12 L11 L10 R15 R14 R13 R12 R11 R10 ...

Page 25

TDM: 64-BIT DATA, 64-BIT FRAME, SD_MODE LOGIC-HIGH LRCLK BCLK DIN Y1 Y0 L15 L14 L13 L12 L11 L10 R15 R14 R13 R12 R11 R10 ...

Page 26

... LOGIC VOLTAGE LEVEL (V DDIO 1.8 3.3 ___ Maxim Integrated Products 26 MAX98355A/MAX98355B Standby Mode The ICs feature a low-power shutdown mode, drawing less than 0.6FA (typ) of supply current. During shutdown, all internal blocks are turned off, including setting the output stage to a high-impedance state. Drive SD_MODE low to put the ICs into shutdown ...

Page 27

... EMI emissions while maintaining up to 92% efficiency. V DDIO MAX98355A MAX98355B R V SD_MODE 100kI ±8% MAX98355A MAX98355B R V SD_MODE 100kI ±8% Class D Speaker Amplifier 2 R loss of the Ultra-Low EMI Filterless Output Stage LEFT MODE B2 (1.4V typ) RIGHT MODE B1 (0 ...

Page 28

... FREQUENCY (MHz) Figure 14. EMI with 12in of Speaker Cable and No Output Filtering ___ Maxim Integrated Products 28 MAX98355A/MAX98355B full-scale output of the DAC, which is 2.1dBV Assuming that the desired output swing is not limited by the supply voltage rail, the ICs output level can be calcu- lated based on the digital input signal level and selected ...

Page 29

... Applications Information 2.5V TO 5.5V 10µF 0.1µF CODEC V GAIN DD SD_MODE B2 A2 GPIO BCLK C1 BIT CLOCK MAX98355A LRCLK MAX98355B C3 B3 DIN DATA OUT B1 C2 GND RESPONDS TO LEFT CHANNEL WHEN GPIO IS HIGH. THE MAX98355A/MAX98355B IS SHUTDOWN WHEN GPIO IS LOW OUTP A3 OUTN B3 1.8V. GPIO OUTP OUTN ...

Page 30

... THE MAX98355A/MAX98355B IS SHUTDOWN WHEN GPIO IS LOW. 2.5V TO 5.5V 10µF 0.1µF R SMALL V GAIN DD (76.8kI) SD_MODE BCLK C1 MAX98355A LRCLK MAX98355B C3 B3 DIN B1 C2 GND RESPONDS TO RIGHT CHANNEL WHEN GPIO IS HIGH. 76.8kI ASSUMES V 1.8V. GPIO THE MAX98355A/MAX98355B IS SHUTDOWN WHEN GPIO IS LOW. OUTP OUTN OUTP OUTN ...

Page 31

... C2 LEFT AND RIGHT CHANNELS SUMMED WHEN GPIO IS HIGH. 300kI ASSUMES V 1.8V. GPIO THE MAX98355A/MAX98355B IS SHUTDOWN WHEN GPIO IS LOW. Figure 19. (Left Right)/2 PCM Operation with 6dB Gain ___ Maxim Integrated Products 31 MAX98355A/MAX98355B Proper layout and grounding are essential for optimum performance. Good grounding improves audio perfor- mance and prevents switching noise from coupling into the audio signal ...

Page 32

... Ordering Information PART TEMP RANGE MAX98355AEWL -40NC to 85NC MAX98355BEWL -40NC to 85NC Denotes a lead(Pb)-free/RoHS-compliant package. ___ Maxim Integrated Products 32 MAX98355A/MAX98355B 2.5V TO 5.5V 10µF 0.1µ MAX98355A MAX98355B INTERPOLATOR DAC C2 GND PIN-PACKAGE 9 WLP 9 WLP Functional Diagram GAIN B2 A3 OUTP CLASS D OUTPUT STAGE B3 OUTN ...

Page 33

... All dimensions in millimeter. 4. Marking shown is for package orientation reference only. 5. Tolerance is ± 0.02 unless specified otherwise. 6. All dimensions apply to PbFree () package codes only. 7. Front - side finish can be either Black or Clear. - DRAWING NOT TO SCALE - ___ Maxim Integrated Products 33 MAX98355A/MAX98355B OUTLINE NO. 21-0459 MARKING A1 D 0.05 S ...

Page 34

... Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2012 Maxim Integrated Products MAX98355A/MAX98355B DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc. Revision History ...

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