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PDF MAX9789 Data sheet ( Hoja de datos )

Número de pieza MAX9789
Descripción Windows Vista-Compliant Stereo Class AB Speaker Amplifiers and DirectDrive Headphone Amplifiers
Fabricantes Maxim Integrated Products　
Logotipo Maxim Integrated Products Logotipo



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No Preview Available ! MAX9789 Hoja de datos, Descripción, Manual

19-0606; Rev 3; 9/09
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Windows Vista-Compliant, Stereo Class AB Speaker
Amplifiers and DirectDrive Headphone Amplifiers
General Description
The MAX9789/MAX9790 combine a stereo, 2W Class AB
speaker power amplifier with a stereo 100mW
DirectDrive® headphone amplifier in a single device. The
MAX9789/MAX9790 are designed for use with the
Microsoft Windows Vista® operating system and are fully
compliant with Microsoft’s Windows Vista specifications.
The headphone amplifier features Maxim’s patented†
DirectDrive architecture that produces a ground-refer-
enced output from a single supply to eliminate the need
for large DC-blocking capacitors, as well as save cost,
board space, and component height. A high +90dB
PSRR and low 0.002% THD+N ensures clean, low-distor-
tion amplification of the audio signal.
Separate speaker and headphone amplifier control
inputs provide independent shutdown of the speaker
and headphone amplifiers, allowing speaker and head-
phone amplifiers to be active simultaneously, if
required. The industry-leading click-and-pop suppres-
sion circuitry reduces audible transients during startup
and shutdown cycles.
The MAX9789 features an internal LDO that can be used
as a clean power supply for a CODEC or other circuits.
The LDO output voltage is set internally at 4.75V or can
be adjusted between 1.21V and 4.75V using a simple
resistive divider. The LDO is protected against thermal
overloads and short circuits while providing 120mA of
continuous output current and can be enabled indepen-
dently of the audio amplifiers.
By disabling the speaker and headphone amplifiers, and
the LDO (for MAX9789), the MAX9789/MAX9790 enter
low-power shutdown mode and draw only 0.3µA.
The MAX9789/MAX9790 operate from a single 4.5V to
5.5V supply and feature thermal-overload and output
short-circuit protection. Devices are specified over the
-40°C to +85°C extended temperature range.
Features
o Microsoft Windows Vista Compliant
o Class AB 2W Stereo BTL Speaker Amplifier
o 100mW DirectDrive Headphone Amplifier
Eliminates Costly, Bulky DC-Blocking Capacitors
o Excellent RF Immunity
o Integrated 120mA LDO (MAX9789)
o High +90dB PSRR, Low 0.002% THD+N
o Low-Power Shutdown Mode
o Click-and-Pop Suppression
o Short-Circuit and Thermal-Overload Protection
o Available in 32-Pin Thin QFN (5mm x 5mm x
0.8mm) Package
Ordering Information
PART
PIN-PACKAGE INTERNAL LDO tON (ms)
MAX9789AETJ+ 32 TQFN-EP*
Yes
100
MAX9789BETJ+** 32 TQFN-EP*
Yes
25
MAX9789CETJ+ 32 TQFN-EP*
Yes
100
MAX9790AETJ+ 32 TQFN-EP*
No
100
MAX9790BETJ+** 32 TQFN-EP*
No
25
Note: All devices are specified over the -40°C to +85°C extended
temperature range.
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
**Future product—contact factory for availability.
Simplified Block Diagrams
SPEAKER SUPPLY HEADPHONE SUPPLY
4.5V TO 5.5V
3.0V TO 5.5V
SPKR_INR
Applications
SPKR_INL
MAX9789
Notebook Computers
Tablet PCs
HP_INR
Portable Multimedia Players
Pin Configurations appear at end of data sheet.
†U.S. Patent # 7,061,327.
Windows Vista is a registered trademark of Microsoft Corp.
HP_INL
4.5V TO 5.5V
SPKR_EN
HP_EN
MUTE
GAIN1
GAIN2
LDO
1.21V TO 4.75V
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
Simplified Block Diagrams continued at end of data sheet.
________________________________________________________________ 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




MAX9789 pdf
www.DataSheet4U.com
Windows Vista-Compliant, Stereo Class AB Speaker
Amplifiers and DirectDrive Headphone Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(VDD = PVDD = CPVDD = HPVDD = HP_EN = VLDO_EN (MAX9789 only) = +5V, VGND = VPGND = VCPGND = SPKR_EN = VLDO_SET
(MAX9789 only) = 0V, ILDO_OUT (MAX9789 only) = 0, C1 = C2 = CBIAS = 1µF. RL = ∞, unless otherwise specified, VGAIN1 = 0,
VGAIN2 = 5V (AVSP = 10dB, AVHP = 3.5dB), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
LDO_SET Input Bias Current
(Note 5)
Dropout Voltage (Note 6)
Current Limit
Startup Time
SYMBOL
CONDITIONS
ISET
VOUT = 4.75V (fixed
VDO output operation),
TA = +25°C
ILIM
IOUT = 50mA
IOUT = 120mA
MIN TYP MAX UNITS
±20 ±500
nA
25 50
75 150
300
20
mV
mA
µs
Line Regulation
VIN = 4.5V to 5.5V, LDO_OUT = 2.5V,
ILDO_OUT = 1mA
-4.8 +0.8 +4.8 mV/V
Load Regulation
Ripple Rejection
VLDO_OUT = 4.75V,
1mA < ILDO_OUT < 120mA
VRIPPLE = 200mVP-P
ILDO_OUT = 10mA
f = 1kHz
f = 10kHz
0.2 mV/mA
59
dB
42
Output Voltage Noise
20Hz to 22kHz, CLDO_OUT = 2 x 1µF,
ILDO_OUT = 120mA
DIGITAL INPUTS (SPKR_EN, HP_EN, MUTE, GAIN1, GAIN2, LDO_EN (MAX9789 Only))
Input-Voltage High
VINH
Input-Voltage Low
VINL
Input Bias Current
125 µVRMS
2V
0.8 V
±1 µA
Note 2: All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design.
Note 3: Specified at room temperature with an 8Ω resistive load connected across BTL output for speaker amplifier. Specified at
room temperature with a 32Ω resistive load connected between HPR, HPL, and GND for headphone amplifier. Speaker and
headphone mode transitions are controlled by SPKR_EN and HP_EN control pins, respectively.
Note 4: Amplifier inputs AC-coupled to GND.
Note 5: Maximum value is due to test limitations.
Note 6: VLDO_OUT = VLDO_OUTNOMINAL - 2%.
_______________________________________________________________________________________ 5

5 Page





MAX9789 arduino
www.DataSheet4U.com
Windows Vista-Compliant, Stereo Class AB Speaker
Amplifiers and DirectDrive Headphone Amplifiers
Typical Operating Characteristics (continued)
(VDD = PVDD = CPVDD = HPVDD = LDO_EN = +5V, VGND = VPGND = VCPGND = VLDO_SET = 0V, C1 = C2 = CBIAS = CIN = 1µF. RL =
∞, unless otherwise specified, GAIN1 = 0, GAIN2 = 1 (AVSP = 10dB, AVHP = 3.5dB), measurement BW = 20kHz AES17, TA = +25°C,
unless otherwise noted. Headphone mode: SPKR_EN = 1, HP_EN = 0. Speaker mode: SPKR_EN = 0, HP_EN = 1.)
HEADPHONE SHUTDOWN WAVEFORM
MAX9789 toc39
SUPPLY CURRENT vs. SUPPLY VOLTAGE
20
HP_EN
15
5V/div
HP_
500mV/div
10
SPKR_EN = 0
HP_EN = 1
5
SPKR_EN = 1
HP_EN = 1
0
SPKR_EN = 0
HP_EN = 0
SPKR_EN = 1
HP_EN = 0
20ms/div
SHUTDOWN CURRENT vs. SUPPLY VOLTAGE
0.3
SPKR_EN = 5V
HP_EN = 0
LDO_EN = 0 (MAX9789)
0.2
0.1
0
4.50
4.75 5.00 5.25
SUPPLY VOLTAGE (V)
5.50
LDO OUTPUT VOLTAGE ACCURACY
vs. AMPLIFIER OUTPUT POWER
0.10
VLDO_OUT = 4.75V
ILDO_OUT = 0A
0.05
0
-0.05
-0.10
0
0.5 1.0 1.5 2.0 2.5
AMPLIFIER OUTPUT POWER (W)
3.0
-5
4.50
4.75 5.00 5.25
SUPPLY VOLTAGE (V)
5.50
LDO OUTPUT VOLTAGE ACCURACY
vs. ILOAD
2.0
VLDO_OUT = 4.75V
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
0
25 50 75 100 125 150
ILOAD (mA)
LDO OUTPUT VOLTAGE ACCURACY
vs. TEMPERATURE
2.0
ILDO_OUT = 1mA
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
-40
-15 10 35 60
TEMPERATURE (°C)
85
______________________________________________________________________________________ 11

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