MAX9751 Maxim Integrated Products, Inc., MAX9751 Datasheet

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MAX9751

Manufacturer Part Number
MAX9751
Description
2.6w Stereo Audio Power Amplifiers And Directdrive Headphone Amplifiers
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
The MAX9750/MAX9751/MAX9755 combine a stereo,
2.6W audio power amplifier and stereo DirectDrive™
110mW headphone amplifier in a single device. The
headphone amplifier uses Maxim’s patented
architecture that produces a ground-referenced output
from a single supply, eliminating the need for large DC-
blocking capacitors, saving cost, space, and component
height. A high 90dB PSRR and low 0.01% THD+N
ensures clean, low-distortion amplification of the
audio signal.
The MAX9750 features an analog volume control, and a
BEEP input. The MAX9751 features a 2:1 input multiplexer,
allowing multiple audio sources to be selected. All devices
feature a single-supply voltage, a shutdown mode, logic-
selectable gain, and a headphone sense input. Industry-
leading click-and-pop suppression eliminates audible
transients during power and shutdown cycles.
The MAX9750/MAX9751/MAX9755 are offered in space-
saving, thermally efficient 28-pin thin QFN (5mm x 5mm
x 0.8mm) and 28-pin TSSOP packages. Both devices
have thermal-overload and output short-circuit protec-
tion, and are specified over the extended -40°C to +85°C
temperature range.
19-3006; Rev 7; 1/07
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Simplified Block Diagrams continued at end of data sheet.
Notebook PCs
Tablet PCs
Portable DVD Players LCD Projectors
MAX9750
BEEP
VOL
Simplified Block Diagrams
________________________________________________________________ Maxim Integrated Products
2.6W Stereo Audio Power Amplifiers and
General Description
EVALUATION KIT
AVAILABLE
Flat-Panel TVs
PC Displays
DirectDrive Headphone Amplifiers
Applications
DirectDrive
♦ No DC-Blocking Capacitors Required—Provides
♦ PC2001 Compliant
♦ 5V Single-Supply Operation
♦ Class AB 2.6W Stereo BTL Speaker Amplifiers
♦ 110mW DirectDrive Headphone Amplifiers
♦ High 90dB PSRR
♦ Low-Power Shutdown Mode
♦ Industry-Leading Click-and-Pop Suppression
♦ Low 0.01% THD+N at 1kHz
♦ Short-Circuit and Thermal Protection
♦ Selectable Gain Settings
♦ Analog Volume Control (MAX9750)
♦ BEEP Input with Glitch Filter (MAX9750)
♦ 2:1 Stereo Input MUX (MAX9751)
♦ ±8kV ESD-Protected Headphone Driver Outputs
♦ Available in Space-Saving, Thermally Efficient
+
*All devices specified over the -40°C to +85°C tempera-
ture range.
MAX9750AETI
MAX9750AEUI
MAX9750BETI
MAX9750BEUI
MAX9750CETI
MAX9750CEUI
MAX9751ETI
MAX9751EUI
MAX9755ETI
MAX9755EUI
U.S. Patent # 7,061,327
Denotes lead-free package.
Industry’s Most Compact Notebook Audio
Solution
Packages
28-Pin Thin QFN (5mm x 5mm x 0.8mm)
28-Pin TSSOP
PART*
+
+
+
+
+
PIN-
PACKAGE
28 Thi n QFN
28 TSSOP
28 Thi n QFN
28 TSSOP
28 Thi n QFN
28 TSSOP
28 Thi n QFN
28 TSSOP
28 Thi n QFN
28 TSSOP
Ordering Information
M A XIM U M
G A I N ( d B )
13.5
13.5
19.5
19.5
10.5
10.5
10.5
10.5
10.5
10.5
Features
T2855N-1
T2855N-1
T2855N-1
T2855N-1
T2855N-1
C O D E
U28-2
U28-2
U28-2
U28-2
U28-2
PK G
1

Related parts for MAX9751

MAX9751 Summary of contents

Page 1

... The MAX9750 features an analog volume control, and a BEEP input. The MAX9751 features a 2:1 input multiplexer, allowing multiple audio sources to be selected. All devices feature a single-supply voltage, a shutdown mode, logic- selectable gain, and a headphone sense input. Industry- leading click-and-pop suppression eliminates audible transients during power and shutdown cycles ...

Page 2

... Amplifier inputs R IN (Note 2) MAX9751/MAX9755 SON Measured MAX9750A/MAX9750B/ between OUT_+ MAX9751/MAX9755 V OS and OUT_-, MAX9750C T = +25°C A MAX9750A/MAX9750B MAX9750C/MAX9751 4. +25°C) MAX9755 1kHz 200mV RIPPLE P 10kHz 200mV RIPPLE P-P = +70°C, multilayer board) A (θ 1µ 1µF, speaker load DD BIAS ...

Page 3

... OUT SNR 22kHz 22Hz to 22kHz, A-weighted sustained oscillations 10kHz Any unselected input to any active input 10kHz (MAX9751), input referred SR GAIN1 = 0, GAIN2 = 0 GAIN1 = 1, GAIN2 = 0 MAX9750A GAIN1 = 0, GAIN2 = 1 GAIN1 = 1, GAIN2 = 1 GAIN1 = 0, GAIN2 = 0 GAIN1 = 1, GAIN2 = 0 MAX9750B GAIN1 = 0, GAIN2 = 1 ...

Page 4

... BW = 22Hz to L OUT 22kHz 22Hz to 22kHz sustained oscillations 10kHz Any unselected input to any active input 10kHz (MAX9751), input referred SR IEC air discharge GAIN2 = GAIN = 0, GAIN1 = GAIN2 = GAIN = 1, GAIN1 = X OSC VOL (Note -25dB to +13.5dB ...

Page 5

Stereo Audio Power Amplifiers and ELECTRICAL CHARACTERISTICS (continued) = 5V, GND = PGND = CPGND = 0V, SHDN = CPV = HPV terminated between OUT_+ and OUT_-, headphone load terminated ...

Page 6

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers (Measurement BW = 22Hz to 22kHz TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (SPEAKER MODE 3Ω 10.5dB V 1 ...

Page 7

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers (Measurement BW = 22Hz to 22kHz OUTPUT POWER vs. LOAD RESISTANCE (SPEAKER MODE) 3.5 3.0 THD+N = 10% 2.5 2.0 THD 1.5 1.0 0 ...

Page 8

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers (Measurement BW = 22Hz to 22kHz TURN-OFF RESPONSE (SPEAKER MODE) SHDN OUT_+ AND OUT_- OUT_+ - OUT_ 8Ω L 20ms/div TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY ...

Page 9

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers (Measurement BW = 22Hz to 22kHz TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER (HEADPHONE MODE) 1000 32Ω L 100 A = 3dB ...

Page 10

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers (Measurement BW = 22Hz to 22kHz HEADPHONE OUTPUT SPECTRUM 0 -20 -40 -60 -80 -100 -120 -140 FREQUENCY (Hz) TURN-OFF RESPONSE (HEADPHONE MODE) SHDN HPOUT_ R ...

Page 11

... Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers PIN MAX9750 MAX9751 THIN THIN TSSOP TSSOP QFN QFN 1 5 — — — — 10 10 ...

Page 12

... The MAX9750 features an analog volume control, BEEP input, and four-level gain control. The MAX9751 features a 2:1 input stereo multiplexer and two-level gain control. All devices feature high 90dB PSRR, low 0.01% THD+N, industry-leading click-pop performance, and a low- power shutdown mode ...

Page 13

... MP3, CD, and DVD players. The MAX9750/MAX9751/MAX9755 feature a low-noise charge pump. The 550kHz switching frequency is well beyond the audio range, and does not interfere with the audio signals. The switch drivers feature a controlled switching speed that minimizes noise generated by turn- on and turn-off transients ...

Page 14

... The gain of the device can vary based upon the volt- age at VOL (see the Analog Volume Control (VOL) sec- tion). However, the maximum gain cannot be exceeded. The gain of the MAX9751/MAX9755 is set by the GAIN input. Driving GAIN high sets the gain of the speaker amplifiers to 9dB and the gain of the headphone ampli- fiers to 0dB ...

Page 15

... BEEP Input Figure 6. Volume Control Circuit (Figure 8) and the The MAX9751 features a 2:1 input multiplexer on each amplifier, allowing input selection between two stereo is either BEEP(OUT) sources. The logic input IN1/2 controls both multiplex- ers. A logic high selects input IN_1 and a logic low selects input IN_2 ...

Page 16

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers Table 3A. MAX9750A Volume Levels V (V) VOL GAIN1 = HPV * MIN MAX DD GAIN2 = 0 0 0.49 0.074 0.49 0.5673 0.160 0.5673 0.6447 ...

Page 17

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers Table 3B. MAX9750B Volume Levels V (V) VOL HPV * MIN MAX DD 0 0.49 0.074 0.49 0.5673 0.160 0.5673 0.6447 0.183 0.6447 0.722 0.207 0.722 0.7994 ...

Page 18

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers Table 3C. MAX9750C Volume Levels V (V) VOL HPV * MIN MAX DD 0 0.49 0.074 0.49 0.5673 0.160 0.5673 0.6447 0.183 0.6447 0.722 0.207 0.722 0.7994 ...

Page 19

... Likewise, during shutdown, the capacitor is discharged to GND shift across the capacitor results, which in turn appears as an audible AUDIO transient at the speaker. Since the MAX9750/MAX9751/ TAPER POT MAX9755 do not require output-coupling capacitors, no audible transient occurs. Additionally, the MAX9750/MAX9751/MAX9755 features extensive click-and-pop suppression that eliminates any audible transient sources internal to the device ...

Page 20

... Inputs In/Out of Phase (Headphone Mode) Power Dissipation and Heat Sinking Under normal operating conditions, the MAX9750/ MAX9751/MAX9755 can dissipate a significant amount of power. The maximum power dissipation for each package is given in the Absolute Maximum Ratings under Continuous Power Dissipation, or can be calcu- ...

Page 21

... Figure 10 shows the two extreme cases for in and out of phase. In reality, the available power lies between these extremes. The MAX9750/MAX9751/MAX9755 have different sup- plies for each portion of the device, allowing for the opti- mum combination of headroom and power dissipation and noise immunity ...

Page 22

... CPV is used by the MAX9750 MAX9751/MAX9755 to provide the negative supply for the headphone amplifiers. It can also be used to power other devices within a design. Current draw from CPV should be limited to 5mA, exceeding this affects the oper- ation of the headphone amplifier. A typical application is a negative supply to adjust the contrast of LCD modules ...

Page 23

... Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MUX MAX9751 ______________________________________________________________________________________ Simplified Block Diagrams (continued) MAX9755 23 ...

Page 24

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers C IN 1μF INL LEFT-CHANNEL AUDIO INPUT C IN 1μF INR RIGHT-CHANNEL AUDIO INPUT BIAS C BIAS 1μF VOL GAIN1 V DD GAIN2 1μF 47kΩ BEEP SHDN ...

Page 25

... Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers 0.1μF MAX9751 (5) 1μF INL1 LEFT CHANNEL AUDIO INPUT C 2 INPUT IN 1μF INL2 (6) MUX LEFT CHANNEL AUDIO INPUT (3) 1μF INR1 RIGHT CHANNEL AUDIO INPUT 28 INPUT C IN MUX 1μF INR2 ...

Page 26

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers 1μF INL (6) LEFT CHANNEL AUDIO INPUT 1μF INR (4) RIGHT CHANNEL AUDIO INPUT 21 (25) BIAS C BIAS 1μF 24 (28) GAIN V DD ...

Page 27

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers 1μF AUX_IN OUT CODEC 2kΩ MAX4060 BIAS 2kΩ μC 1μF IN+ 1μF IN 5.5V 1μF ______________________________________________________________________________________ 4. 5.5V 0.1μ HPV ...

Page 28

... MAX4060 BIAS 2kΩ 1μF IN+ 1μF IN- 28 ______________________________________________________________________________________ System Diagrams (continued) 4.5V TO 5.5V 0.1μ 1μF INL1 CODEC INL2 MAX9751 1μF INR1 OUT INR2 SHDN μC IN1/2 GAIN 3V TO 5.5V CPV DD 1μF C1P 1μF C1N GND PROCESS: BiCMOS 3V TO 5.5V 10μF HPV ...

Page 29

... HPS MAX9755 INL 6 23 PGND PGND 7 22 OUTR OUTR- OUTL HPV HPOUTL DD C1P 12 17 HPOUTR C1N 14 15 CPV SS TSSOP HPOUTL 13 HPOUTR MAX9751 11 CPV SS 10 C1N 9 CPGND 8 C1P ...

Page 30

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 30 ______________________________________________________________________________________ Package Information ...

Page 31

... Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 31 © 2007 Maxim Integrated Products Package Information (continued) PACKAGE OUTLINE, TSSOP 4.40mm BODY 21-0066 is a registered trademark of Maxim Integrated Products, Inc ...

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