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PDF MAX9875 Data sheet ( Hoja de datos )
| Número de pieza | MAX9875 | |
| Descripción | Low RF Susceptibility Mono Audio Subsystem | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-4536; Rev 0; 3/09
EVAALVUAAILTAIOBNLEKIT
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
www.datasheet4u.com
General Description
The MAX9875 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 MAX9875 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 modu-
lation greatly reduces EMI while eliminating the need for
output filtering used in traditional Class D devices.
The stereo Class AB headphone amplifier in the
MAX9875 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.
The MAX9875 is available in a thermally efficient,
space-saving 20-bump WLP package.
Applications
Cell Phones
Portable Multimedia Players
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
Simplified Block Diagram
SINGLE SUPPLY
2.7V TO 5.25V
Features
♦ Low Emissions, Filterless Class D Amplifier
Achieves Better than 10dB Margin Under EN55022
Class B Limits
♦ Low RF Susceptibility Design Rejects TDMA
Noise from GSM Radios
♦ Input Mixer with User-Defined Input Mode
♦ 725mW Speaker Output (RSPK = 8Ω, PVDD = 3.7V)
♦ 53mW Headphone Output (RHP = 16Ω, VDD = 3.7V)
♦ Low 0.05% THD+N at 1kHz (Class D Power
Amplifier)
♦ Low 0.016% THD+N at 1kHz (Headphone
Amplifier)
♦ 87% Efficiency (RSPK = 8Ω, POUT = 750mW)
♦ High Speaker Amplifier PSRR (72dB at 217Hz)
♦ High Headphone Amplifier PSRR (84dB at 217Hz)
♦ I2C Control
♦ Hardware and Software Shutdown Mode
♦ Click-and-Pop Suppression
♦ Current-Limit and Thermal Protection
♦ Available in a Space-Saving, 2.5mm x 2.0mm WLP
Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX9875ERP+TG45 -40°C to +85°C
20 WLP (5x4)
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
G45 indicates protective die coating.
Pin Configuration
TOP VIEW
(BUMP SIDE DOWN)
1 23 45
PREAMPLIFIER
VOLUME
CONTROL
MIXER/MUX
I2C
INTERFACE
VOLUME
CONTROL
MAX9875
A
HPR HPL VSS C1N C1P
B
VDD BIAS SDA N.C. OUT+
C
INB2 INB1 SCL PGND PVDD
D
INA2 INA1 GND N.C. OUT-
WLP
________________________________________________________________ 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)
www.datasheet4u.com
(VDD = VPVDD = 3.7V, VGND = VPGND = 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, SPKEN = 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
Slew Rate
SYMBOL
SR
CONDITIONS
MIN TYP MAX UNITS
0.35 V/µs
Capacitive Drive
Crosstalk
CL
HPL to HPR, HPR to HPL, f = 20Hz to 20kHz
100
65
pF
dB
Charge-Pump Frequency
VOLUME CONTROL
Spread-spectrum modulation mode,
OSC = 00
Fixed-frequency mode, OSC = 01
Fixed-frequency mode, OSC = 10
588
±30
430 550 670
220 350 500
kHz
Minimum Setting
Maximum Setting
Preamp Gain
_VOL = 1
_VOL = 31
Input A or B
PGAIN_ = 00
PGAIN_ = 01
-75 dB
0 dB
0
9 dB
Mute Attenuation
f = 1kHz, _VOL = 0
PGAIN_ = 10
Speaker
Headphone
20
100
dB
110
Zero-Crossing Detection Timeout
ZCD = 1
60 ms
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)
SDA, SCL; TA = +25°C
1.4 V
0.4 V
0.15 V
80 mV
4 pF
±1.0
µA
94 µA
Output Low Voltage SDA
Output Fall Time SDA
2-WIRE INTERFACE TIMING
VOL ISINK = 3mA
tOF
VH(MIN) to VL(MAX) bus capacitance = 10pF
to 400pF, ISINK = 3mA
0.4 V
250 ns
External Pullup Voltage Range:
SDA and SCL
1.7 3.6 V
Serial Clock Frequency
Bus Free Time Between STOP
and START Conditions
fSCL
tBUF
DC 400 kHz
1.3 µs
START Condition Hold
START Condition Setup Time
Clock Low Period
Clock High Period
tHD:STA
tSU:STA
tLOW
tHIGH
0.6 µs
0.6 µs
1.3 µs
0.6 µs
_______________________________________________________________________________________ 5
5 Page 
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
www.datasheet4u.com
Typical Operating Characteristics (continued)
(VDD = VPVDD = 3.7V, VGND = VPGND = 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, 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
-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 MAX9875.PDF ] | |
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