MAX9770ETI+ Maxim Integrated Products, MAX9770ETI+ Datasheet

IC AMP AUDIO 1.2W MONO D 28TQFN

MAX9770ETI+

Manufacturer Part Number
MAX9770ETI+
Description
IC AMP AUDIO 1.2W MONO D 28TQFN
Manufacturer
Maxim Integrated Products
Type
Class Dr
Datasheet

Specifications of MAX9770ETI+

Output Type
1-Channel (Mono) with Stereo Headphones
Max Output Power X Channels @ Load
1.2W x 1 @ 8 Ohm; 80mW x 2 @ 16 Ohm
Voltage - Supply
2.5 V ~ 5.5 V
Features
Depop, Input Multiplexer, Mute, Short-Circuit and Thermal Protection, Shutdown
Mounting Type
Surface Mount
Package / Case
28-TQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX9770 combines a mono, filterless, Class D
speaker amplifier and stereo DirectDrive
amplifier in a single device. The MAX9770 operates
from a single 2.5V to 5.5V supply and includes features
that reduce external component count, system cost,
board space, and offer improved audio reproduction.
The speaker amplifier makes use of Maxim’s Class D
architecture, providing Class AB performance with Class
D efficiency, conserving board space, and extending
battery life. The speaker amplifier delivers 1.2W into an
8Ω load while offering efficiencies above 85%. A spread-
spectrum modulation scheme reduces radiated emis-
sions caused by the modulation frequency. Furthermore,
the MAX9770 oscillator can be synchronized to an exter-
nal clock through the SYNC input, avoiding possible
problem frequencies inside a system. The speaker
amplifier features THD+N as low as 0.025%, high 70dB
PSRR, and SNR in excess of 90dB.
The headphone amplifiers feature Maxim’s DirectDrive
architecture that produces a ground-referenced output
from a single supply, eliminating the need for large DC-
blocking capacitors. The headphone amplifiers deliver up
to 80mW into a 16Ω load, feature low 0.015% THD+N,
high 85dB PSRR, and ±8kV ESD-protected outputs. A
headphone sense input detects the presence of a head-
phone, and automatically configures the amplifiers for
either speaker or headphone mode.
The MAX9770 includes internally set, logic-selectable
gain, and a comprehensive input multiplexer/mixer, allow-
ing multiple audio sources to be selected and for true
mono reproduction of a stereo source in speaker mode.
Industry-leading click-and-pop suppression eliminates
audible transients during power and shutdown cycles. A
low-power shutdown mode decreases supply current
consumption to 0.1µA, further extending battery life.
The MAX9770 is offered in space-saving, thermally effi-
cient 28-pin TQFN (5mm x 5mm x 0.8mm) and 28-pin
TSSOP packages. The MAX9770 features thermal-over-
load and output short-circuit protection, and is speci-
fied over the extended -40°C to +85°C temperature
range.
19-3134; Rev 2; 4/08
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.
1.2W, Low-EMI, Filterless, Mono Class D Amplifier
Cellular Phones
Compact Notebooks
PDAs
with Stereo DirectDrive Headphone Amplifiers
________________________________________________________________ Maxim Integrated Products
General Description
EVALUATION KIT
AVAILABLE
Applications
®
headphone
♦ 1.2W Filterless Class D Amplifiers Pass FCC
♦ Spread-Spectrum Mode Offers 5dB EMI
♦ 80mW DirectDrive Headphone Amplifier
♦ High 85dB PSRR at 217Hz
♦ 85% Efficiency
♦ Low 0.015% THD+N
♦ Industry-Leading Click-and-Pop Suppression
♦ Integrated 3-Way Input Mixer/Multiplexer
♦ Logic-Adjustable Gain
♦ Short-Circuit and Thermal Protection
♦ Available in Space-Saving, Thermally Efficient
Note: All devices specified over the -40°C to +85°C operating
temperature range.
* EP = Exposed pad.
+
Pin Configuration appears at end of data sheet.
MAX9770ETI+
MAX9770EUI
Denotes a lead-free package.
MONO
IN1R
IN2R
Class B Radiated EMI Standards with 100mm
Improvement over Conventional Methods
Eliminates Bulky DC-Blocking Capacitors
(MAX9770)
Packages
IN1L
IN2L
PART
of Cable
GAIN SEL
INPUT SEL
MUTE
SHDN
HPS
Simplified Block Diagram
PIN-PACKAGE
28 TQFN-EP*
28 TSSOP
Ordering Information
V
DD
MAX9770
CLASS
D
SELECTABLE INPUTS
2 stereo, 1 mono
2 stereo, 1 mono
Features
HEADPHONE
DirectDrive
STEREO
SPKR
(MONO)
1

Related parts for MAX9770ETI+

MAX9770ETI+ Summary of contents

Page 1

... Integrated 3-Way Input Mixer/Multiplexer (MAX9770) ♦ Logic-Adjustable Gain ♦ Short-Circuit and Thermal Protection ♦ Available in Space-Saving, Thermally Efficient Packages PART MAX9770ETI+ MAX9770EUI Note: All devices specified over the -40°C to +85°C operating temperature range Exposed pad. + Denotes a lead-free package. Pin Configuration appears at end of data sheet. ...

Page 2

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers ABSOLUTE MAXIMUM RATINGS GND to PGND to CPGND......................................-0.3V to +0. CPV ..........................................-0.3V to +0. GND ...........................................................................+ ...

Page 3

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued) = 3.3V, GND = PGND = CPGND = 0V, SHDN = 3.3V 1µ CPV DD DD ...

Page 4

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued) = 3.3V, GND = PGND = CPGND = 0V, SHDN = 3.3V 1µ CPV DD DD ...

Page 5

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers (V = 3.3V 22Hz to 22kHz, GAIN1 = 1, GAIN2 = 0, spread-spectrum mode, headphone outputs in phase, unless otherwise DD noted.) TOTAL HARMONIC DISTORTION PLUS ...

Page 6

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers (V = 3.3V 22Hz to 22kHz, GAIN1 = 1, GAIN2 = 0, spread-spectrum mode, headphone outputs in phase, unless otherwise DD noted.) OUTPUT POWER vs. LOAD ...

Page 7

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers (V = 3.3V 22Hz to 22kHz, GAIN1 = 1, GAIN2 = 0, spread-spectrum mode, headphone outputs in phase, unless otherwise DD noted.) WIDEBAND OUTPUT SPECTRUM (SPEAKER ...

Page 8

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers (V = 3.3V 22Hz to 22kHz, GAIN1 = 1, GAIN2 = 0, spread-spectrum mode, headphone outputs in phase, unless otherwise DD noted.) TOTAL HARMONIC DISTORTION PLUS ...

Page 9

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers (V = 3.3V 22Hz to 22kHz, GAIN1 = 1, GAIN2 = 0, spread-spectrum mode, headphone outputs in phase, unless otherwise DD noted.) POWER-SUPPLY REJECTION RATIO vs. ...

Page 10

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers PIN NAME TQFN-EP TSSOP 1 4 BIAS HPOUTR 4 7 HPOUTL HPS 7 10 CPV DD ...

Page 11

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers Detailed Description The MAX9770 combines a mono 1.2W Class D speaker amplifiers and stereo 80mW DirectDrive headphone amplifiers with integrated headphone sensing and comprehensive click-and-pop suppression. A mixer/multiplexer ...

Page 12

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers Operating Modes The switching frequency of the charge pump is 1/2 the switching frequency of the Class D amplifier, regard- less of the operating mode. When SYNC is ...

Page 13

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers V IN- V IN+ OUT- OUT+ t ON(MIN OUT+ OUT- Figure 2. MAX9770 Output with an Input Signal Applied (SSM Mode) 50.0 45.0 40.0 35.0 ...

Page 14

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers OUT- OUT+ V OUT OUT Figure 4. MAX9770 Output with No Signal Applied Maxim’s DirectDrive architecture uses a charge pump ...

Page 15

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers Table 2. MAX9770 Multiplexer/Mixer Settings SEL1 SEL2 SELM HPOUTL MUTE IN1L IN2L MONO ...

Page 16

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers Table 3. Gain Selection MAX9770 GAIN1 GAIN2 SPEAKER GAIN (dB Table 4. Gain Settings with HPS ...

Page 17

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers Although this movement is small, a speaker not designed to handle the additional power may be damaged. For optimum results, use a speaker with a series inductance >10µH. ...

Page 18

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers Table 5. Suggested Capacitor Manufacturers SUPPLIER Taiyo Yuden TDK Charge-Pump Capacitor Selection Use capacitors with an ESR less than 100mΩ for opti- mum performance. Low-ESR ceramic capacitors mini- ...

Page 19

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers 16 (19) SYNC 0.47μF IN1L (28) LEFT-CHANNEL AUDIO INPUT 0.47μF IN1R (3) RIGHT-CHANNEL AUDIO INPUT ...

Page 20

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers AUDIO DAC FM RADIO MODULE BASEBAND PROCESSOR 20 ______________________________________________________________________________________ 2.5V TO 5.5V 1μ HPV 0.47μF OUT+ IN1R OUT- IN1L 0.47μF MAX9770 HPOUTL 0.47μF ...

Page 21

Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers TOP VIEW GND 1 IN2R 2 IN1R 3 BIAS MAX9770 HPOUTR 6 HPOUTL HPS 9 CPV 10 DD CPV 11 ...

Page 22

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 22 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products ...

Related keywords