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PDF MAX9877AERP Data sheet ( Hoja de datos )
| Número de pieza | MAX9877AERP | |
| Descripción | Mono Audio Subsystem | |
| Fabricantes | Maxim Integrated Products | |
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19-4651; Rev 0; 5/09
EVAALVUAAILTAIOBNLEKIT
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
General Description
The MAX9877A combines a high-efficiency Class D
audio power amplifier with a stereo Class AB capacitor-
less DirectDrive® headphone amplifier. Maxim’s 3rd
generation, filterless Class D amplifier with active emis-
sions limiting* technology provides Class AB perfor-
mance with Class D efficiency.
The MAX9877A delivers up to 725mW from a 3.7V supply
into an 8Ω load with 87% efficiency to extend battery life.
The filterless modulation scheme combined with active
emissions limiting circuitry and spread-spectrum modula-
tion** greatly reduces EMI while eliminating the need for
output filtering used in traditional Class D devices.
The stereo Class AB headphone amplifier in the
MAX9877A uses Maxim’s patented DirectDrive architec-
ture, that produces a ground-referenced output from a
single supply, eliminating the need for large DC-blocking
capacitors, saving cost, space, and component height.
The device utilizes a user-defined input architecture,
three preamplifier gain settings, an input mixer, volume
control, comprehensive click-and-pop suppression, and
I2C control. A bypass mode feature disables the integrat-
ed Class D amplifier and utilizes an internal DPST switch
to allow an external amplifier to drive the speaker that is
connected at the outputs of the MAX9877A.
The MAX9877A is available in a thermally efficient,
space-saving 20-bump MaxFilm package.
Applications
Cell Phones
Portable Multimedia Players
www.Da*tUaS.Sh.ePeat4teUn.ct o#m7,190,225.
**U.S. Patent #6,847,257.
Simplified Block Diagram
SINGLE SUPPLY
2.7V TO 5.25V
Features
o Low Emissions, Filterless Class D Amplifier
Achieves Better than 10dB Margin Under EN55022
Class B Limits
o Low RF Susceptibility Design Rejects TDMA
Noise from GSM Radios
o Input Mixer with User-Defined Input Mode
o 725mW Speaker Output (RSPK = 8Ω, PVDD = 3.7V)
o 53mW Headphone Output (RHP = 16Ω, VDD = 3.7V)
o Low 0.05% THD+N at 1kHz (Class D Power
Amplifier)
o Low 0.016% THD+N at 1kHz (Headphone
Amplifier)
o 87% Efficiency (RSPK = 8Ω, POUT = 750mW)
o 1.6Ω Analog Switch for Speaker Amplifier Bypass
o High Speaker Amplifier PSRR (72dB at 217Hz)
o High Headphone Amplifier PSRR (84dB at 217Hz)
o I2C Control
o Hardware and Software Shutdown Mode
o Click-and-Pop Suppression
o Current-Limit and Thermal Protection
o Available in a Space-Saving, 2.5mm x 2.0mm
MaxFilm Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX9877AERP+T
-40°C to +85°C 20 MaxFilm (5x4)
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
TOP VIEW
(BUMP SIDE DOWN)
1
Pin Configuration
23 45
PREAMPLIFIER
VOLUME
CONTROL
MIXER/MUX
I2C
INTERFACE
MAX9877A
VOLUME
CONTROL
BYPASS
A
HPR HPL VSS C1N C1P
B
VDD BIAS SDA RXIN+ OUT+
C
INB2 INB1 SCL PGND PVDD
D
INA2 INA1 GND RXIN- OUT-
MaxFilm
________________________________________________________________ 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.
1 page  
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VDD = PVDD = 3.7V, VGND = VPGND = 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS = 0,
SHDN = 1. Speaker loads (ZSPK) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to GND.
SDA and SCL pullup voltage = 3.3V. ZSPK = ∞, RHP = ∞. C1 = C2 = CBIAS = 1µF. TA = TMIN to TMAX, unless otherwise noted. Typical
values are at TA = +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Slew Rate
Capacitive Drive
Crosstalk
SR
CL
HPL to HPR, HPR to HPL, f = 20Hz to 20kHz
0.35
100
65
V/µs
pF
dB
Charge-Pump Frequency
VOLUME CONTROL
Minimum Setting
Maximum Setting
Spread-spectrum modulation mode,
OSC = 00
Fixed-frequency mode, OSC = 01
Fixed-frequency mode, OSC = 10
_VOL = 1
_VOL = 31
588
±30
430 550 670
220 350 500
-75
0
kHz
dB
dB
Preamp Gain
Mute Attenuation
Zero-Crossing Detection Timeout
Input A or B
f = 1kHz, _VOL = 0
ZCD = 1
PGAIN_ = 00
PGAIN_ = 01
PGAIN_ = 10
Speaker
Headphone
0
9 dB
20
100
dB
110
60 ms
ANALOG SWITCH
On-Resistance
RON
IRXIN_ = 20mA, RXIN_
= 0V and VDD,
BYPASS = 1
TA = +25°C
TA = TMIN to TMAX
1.6 4.5
5.2
Ω
www.DataSheet4U.com
Total Harmonic Distortion
VDIF = 2VP-P,
VCM = VDD/2,
f = 1kHz, BYPASS = 1,
TA = +25°C
Series resistance
is 9.1Ω per switch
No series resistors
0.05 0.25
0.3
%
Off-Isolation
BYPASS = 0, RXIN+ and RXIN- to GND =
50Ω, ZSPK = 8Ω + 68µH, f = 10kHz,
referred to speaker output signal
88 dB
DIGITAL INPUTS
Input-Voltage High (SDA, SCL)
VH
Input-Voltage Low (SDA, SCL)
VL
Input-Voltage Low (BIAS)
VBL
Input Hysteresis (SDA, SCL)
VHYS
SDA, SCL Input Capacitance
CIN
Input Leakage Current
IIN
BIAS Pullup Current
IBIAS
DIGITAL OUTPUTS (SDA Open Drain)
Output Low Voltage SDA
VOL
Output Fall Time SDA
tOF
SDA, SCL
ISINK = 3mA
VH(MIN) to VL(MAX) bus capacitance = 10pF
to 400pF, ISINK = 3mA
1.4
V
0.4 V
0.15 V
80 mV
4 pF
+1.0
µA
94 µA
0.4 V
250 ns
_______________________________________________________________________________________ 5
5 Page 
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
Typical Operating Characteristics (continued)
(VDD = PVDD = 3.7V, VGND = VPGND = 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS =
0, SHDN = 1. Speaker loads (ZSPK) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to
GND. ZSPK = ∞, RHP = ∞. C1 = C2 = CBIAS = 1µF. TA = +25°C, unless otherwise noted.)
IN-BAND OUTPUT SPECTRUM
0
fOSC = 1176kHz
-20 fIN = 1kHz
-40
-60
-80
-100
-120
-140
0
5 10 15
FREQUENCY (kHz)
20
WIDEBAND OUTPUT SPECTRUM
0
fOSC = 1100kHz
-10 INPUTS AC-COUPLED TO GND
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.1
1 10
FREQUENCY (MHz)
100
WIDEBAND OUTPUT SPECTRUM
0
fOSC = 700kHz
-10 INPUTS AC-COUPLED TO GND
-20
-30
-40
-50
-60
-70
www.DataSheet4U.com-80
-90
-100
0.1
1 10
FREQUENCY (MHz)
100
HARDWARE SHUTDOWN RESPONSE
WIDEBAND OUTPUT SPECTRUM
0
fOSC = 1176kHz
-10 INPUTS AC-COUPLED TO GND
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.1
1 10
FREQUENCY (MHz)
100
SOFTWARE SHUTDOWN
ON- AND OFF-RESPONSE
VBIAS
500mV/div
VSDA
2V/div
OUT+ - OUT-
1V/div
OUT+ - OUT-
1V/div
20ms/div
20ms/div
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX9877AERP.PDF ] | |
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