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PDF MAX9790A Data sheet ( Hoja de datos )
| Número de pieza | MAX9790A | |
| Descripción | (MAX9789A / MAX9790A) DirectDrive Headphone Amplifiers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-0606; Rev 0; 9/06
Windows Vista-Compliant, Stereo Class AB Speaker
Amplifiers and DirectDrive Headphone Amplifiers
General Description
The MAX9789A/MAX9790A combine a stereo, 2W Class
AB speaker power amplifier with a stereo 100mW
DirectDrive™ headphone amplifier in a single device.
The MAX9789A/MAX9790A 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 MAX9789A features an internal LDO that can be
used as a clean power supply for a CODEC or other cir-
cuits. The LDO output voltage is set internally at 4.75V or
can be adjusted between 1.21V and 4.75V using a sim-
ple resistive divider. The LDO is protected against ther-
mal overloads and short circuits while providing 120mA
of continuous output current and can be enabled inde-
pendently of the audio amplifiers.
By disabling the speaker and headphone amplifiers, and
the LDO (for MAX9789A), the MAX9789A/MAX9790A
enter low-power shutdown mode and draw only 0.3µA.
The MAX9789A/MAX9790A operate from a single 4.5V
to 5.5V supply and feature thermal-overload and out-
put short-circuit protection. Devices are specified over
the -40°C to +85°C extended temperature range.
Applications
Notebook Computers
Tablet PCs
Portable Multimedia Players
Pin Configurations appear at end of data sheet.
†U.S. Patent # 7,061,327
Windows Vista is a trademark of Microsoft Corp.
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 (MAX9789A)
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 ±8kV ESD-Protected Headphone Driver Outputs
o Available in 32-Pin Thin QFN (5mm x 5mm x
0.8mm) Package
Ordering Information
PART
PIN-PACKAGE
INTERNAL
LDO
PKG
CODE
MAX9789AETJ+ 32 Thin QFN-EP* Yes T3255N-1
MAX9790AETJ+ 32 Thin QFN-EP* No T3255N-1
Note: All devices are specified over the -40°C to +85°C extended
temperature range.
+Denotes lead-free package.
*EP = Exposed paddle.
Simplified Block Diagrams
SPEAKER SUPPLY HEADPHONE SUPPLY
4.5V TO 5.5V
3.0V TO 5.5V
SPKR_INR
SPKR_INL
MAX9789A
HP_INR
HP_INL
4.5V TO 5.5V
SPKR_EN
HP_EN
MUTE
GAIN1
GAIN2
LDO
1.21V TO 4.75V
Simplified Block Diagrams continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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.
DataSheet4 U .com
1 page  
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Windows Vista-Compliant, Stereo Class AB Speaker
Amplifiers and DirectDrive Headphone Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(VDD = PVDD = CPVDD = HPVDD = LDO_EN (MAX9789A only) = +5V, GND = PGND = CPGND = LDO_SET (MAX9789A only) = 0V,
ILDO_OUT (MAX9789A only) = 0, C1 = C2 = CBIAS = 1µF. RL = ∞, unless otherwise specified, GAIN1 = 0, GAIN2 = 5V (AVSP = 10dB,
AVHP = 3.5dB), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Current Limit
Startup Time
ILIM
300 mA
20 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
VLDO_OUT = 4.75V,
1mA < ILDO_OUT < 120mA
0.2 mV/mA
Ripple Rejection
VRIPPLE = 200mVP-P
ILDO_OUT = 10mA
f = 1kHz
f = 10kHz
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 (MAX9789A Only))
Input-Voltage High
VINH
Input-Voltage Low
VINL
Input Bias Current
2
125 µVRMS
V
0.8 V
±1 µA
Note 1: All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design.
Note 2: 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 3: Amplifier inputs AC-coupled to GND.
Note 4: Maximum value is due to test limitations.
Note 5: VLDO_OUT = VLDO_OUTNOMINAL - 2%.
Typical Operating Characteristics
(VDD = PVDD = CPVDD = HPVDD = LDO_EN = +5V, GND = PGND = CPGND = LDO_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.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
-60
FS = 0.707VRMS
VOUT = -3dB FS
-70 RL = 10kΩ
-80
-90
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
-60
HPVDD = 3V
FS = 0.707VRMS
VOUT = -3dB FS
-70 RL = 10kΩ
-80
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT VOLTAGE (HEADPHONE MODE)
10
RL = 10kΩ
1
fIN = 20Hz
0.1
fIN = 10kHz
-90 0.01
-100
fIN = 1kHz
-110
10
100 1k 10k
FREQUENCY (Hz)
100k
-100
10
100 1k 10k
FREQUENCY (Hz)
0.001
100k 0
0.5 1.0 1.5
OUTPUT VOLTAGE (VRMS)
2.0
_______________________________________________________________________________________ 5
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Windows Vista-Compliant, Stereo Class AB Speaker
Amplifiers and DirectDrive Headphone Amplifiers
Typical Operating Characteristics (continued)
(VDD = PVDD = CPVDD = HPVDD = LDO_EN = +5V, GND = PGND = CPGND = LDO_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.)
RIPPLE REJECTION vs. FREQUENCY
0
VRIPPLE = 200mVP-P
-10 IOUT = 10mA
-20 OUTPUT REFERRED
OUTPUT NOISE vs. FREQUENCY
10
-30
-40
VLDO_OUT = 4.75V
-50
-60
1
0.1
-70
-80
-90
10
VLDO_OUT = 3.3V
100 1k 10k
FREQUENCY (Hz)
100k
0.01
10
100 1k 10k
FREQUENCY (Hz)
100k
LINE-TRANSIENT RESPONSE
MAX9789A toc46
VDD
1V/div
5.5V
4.5V
LDO LOAD-TRANSIENT RESPONSE
MAX9789A toc47
ILDO_OUT
15mA/div
1ms/div
LDO_OUT
(AC-COUPLED)
20mV/div
20ms/div
AC-COUPLED
VLDO_OUT
10mV/div
LDO SHUTDOWN RESPONSE
MAX9789A toc48
ILOAD = 0mA
LDO_EN
2V/div
200ms/div
VLDO_OUT
2V/div
LDO CROSSTALK vs. FREQUENCY
-20
-30
VLDO_OUT = 4.75V
POUT = 2W
-40 RL = 4Ω
-50 ILOAD = 0mA
-60
-70
RIGHT SPEAKER TO LDO
-80
-90
-100
-110
-120
10
LEFT SPEAKER TO LDO
100 1k 10k
FREQUENCY (Hz)
100k
______________________________________________________________________________________ 11
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| PDF Descargar | [ Datasheet MAX9790A.PDF ] | |
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