max9789a Maxim Integrated Products, Inc., max9789a Datasheet
max9789a
Available stocks
Related parts for max9789a
max9789a Summary of contents
Page 1
... 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 ...
Page 2
... Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS ( CPV = HPV = LDO_EN (MAX9789A only) = +5V, GND = PGND = CPGND = LDO_SET (MAX9789A only (MAX9789A only ...
Page 3
... Windows Vista-Compliant, Stereo Class AB Speaker Amplifiers and DirectDrive Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued CPV = HPV = LDO_EN (MAX9789A only) = +5V, GND = PGND = CPGND = LDO_SET (MAX9789A only (MAX9789A only LDO_OUT A = 3.5dB unless otherwise noted. Typical values are at T ...
Page 4
... Windows Vista-Compliant, Stereo Class AB Speaker Amplifiers and DirectDrive Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued CPV = HPV = LDO_EN (MAX9789A only) = +5V, GND = PGND = CPGND = LDO_SET (MAX9789A only (MAX9789A only LDO_OUT A = 3.5dB unless otherwise noted. Typical values are at T ...
Page 5
... Windows Vista-Compliant, Stereo Class AB Speaker Amplifiers and DirectDrive Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued CPV = HPV = LDO_EN (MAX9789A only) = +5V, GND = PGND = CPGND = LDO_SET (MAX9789A only (MAX9789A only LDO_OUT A = 3.5dB unless otherwise noted. Typical values are at T ...
Page 6
Windows Vista-Compliant, Stereo Class AB Speaker Amplifiers and DirectDrive Headphone Amplifiers ( CPV = HPV = LDO_EN = +5V, GND = PGND = CPGND = LDO_SET = 0V ...
Page 7
... OUTPUT POWER vs. LOAD RESISTANCE (SPEAKER MODE) 3.5 RMS 3.0 2.5 THD+N = 10% 2.0 1.5 1.0 THD 0.5 0 20k (Ω) L POWER-SUPPLY REJECTION RATIO (SPEAKER MODE 200mV RIPPLE P-P OUTPUT REFERRED 10 100 1k 10k 100k FREQUENCY (Hz) SPEAKER SHUTDOWN WAVEFORM MAX9789A toc19 SPKR_EN 5V/div OUT_+ AND OUT_- 2V/div OUT_+ - OUT_- 100mV/div 20ms/div = , 1kHz IN 100 7 ...
Page 8
Windows Vista-Compliant, Stereo Class AB Speaker Amplifiers and DirectDrive Headphone Amplifiers ( CPV = HPV = LDO_EN = +5V, GND = PGND = CPGND = LDO_SET = 0V ...
Page 9
... MODE) 100 HPV = 1kHz IN THD+N = 10% 50 THD 100 1000 R (Ω) L HEADPHONE OUTPUT POWER vs. HPV DD 125 100 R = 16Ω 32Ω THD 1kHz IN 0 3.0 3.5 4.0 4.5 5.0 HPV (V) DD HEADPHONE SHUTDOWN WAVEFORM MAX9789A toc37 HP_EN 5V/div HP_ 500mV/div 20ms/div 9 ...
Page 10
... C = 1µF. R BIAS IN = +25°C, A SPKR_EN = 5V HP_EN = 0 LDO_EN = 0 (MAX9789A) 4.75 5.00 5.25 5.50 SUPPLY VOLTAGE (V) LDO OUTPUT VOLTAGE ACCURACY vs. AMPLIFIER OUTPUT POWER V = 4.75V LDO_OUT LDO_OUT 0 0.5 1.0 1.5 2.0 2.5 3.0 AMPLIFIER OUTPUT POWER (W) DROPOUT VOLTAGE vs. I LOAD V = 4.75V LDO_OUT ...
Page 11
... V LDO_OUT 2V/div -100 -110 -120 = C = 1µF. R BIAS IN = +25°C, A OUTPUT NOISE vs. FREQUENCY 10 100 1k 10k 100k FREQUENCY (Hz) LDO LOAD-TRANSIENT RESPONSE MAX9789A toc47 I LDO_OUT 15mA/div AC-COUPLED V LDO_OUT 10mV/div 20ms/div LDO CROSSTALK vs. FREQUENCY V = 4.75V LDO_OUT OUT R = 4Ω 0mA LOAD ...
Page 12
... Left-Channel Headphone Amplifier Input Signal Ground. Star-connect to PGND. Positive Power Supply and LDO Input (MAX9789A). Bypass with one 0.1µF capacitor and two 1µF capacitors to GND (MAX9789A). Bypass with one 0.1µF capacitor and one 1µF capacitor to GND (MAX9790A). Speaker Amplifier Gain Select 1 Speaker Amplifier Gain Select 2 No Connection ...
Page 13
... GND. The benefit of the GND bias is that the amplifier outputs no longer have a DC component (typically V feature eliminates the large DC-blocking capacitors required with conventional headphone amplifiers to Table 1. Windows Premium Mobile Vista Specifications vs. MAX9789A/MAX9790A Specifications DEVICE TYPE REQUIREMENT THD+N ...
Page 14
... Maxim’s patented DirectDrive architecture uses a charge pump to create an internal negative supply volt- age. It allows the MAX9789A/MAX9790A headphone amplifier output to be biased about GND. With no DC component, there is no need for the large DC-blocking LDO_OUT ...
Page 15
... Limiting the switching speed of the charge pump minimizes the di/dt noise caused by the parasitic bond wire and trace inductance. The MAX9789A/MAX9790A feature an internally gener- ated, power-supply independent, common-mode bias voltage of 1.8V referenced to GND. BIAS provides both click-and-pop suppression and sets the DC bias level for the amplifiers. The BIAS pin should be bypassed to GND with a 1µ ...
Page 16
... Windows Vista-Compliant, Stereo Class AB Speaker Amplifiers and DirectDrive Headphone Amplifiers Speaker and Headphone The MAX9789A/MAX9790A feature control inputs for the independent enabling of the speaker and headphone amplifiers, allowing both to be active simultaneously if required. Driving SPKR_EN high disables the speaker amplifiers. Driving HP_EN low independently disables the headphone amplifiers ...
Page 17
... SNR performance will be improved as a result. 2) Eliminate gain error by eliminating any resistive mismatch between the external resistance used to sum the left and right signals and the MAX9789A internal resistance. Power Dissipation and Heat Sinking Under normal operating conditions, the MAX9789A/ MAX9790A can dissipate a significant amount of power ...
Page 18
Windows Vista-Compliant, Stereo Class AB Speaker Amplifiers and DirectDrive Headphone Amplifiers Headphone Amplifier Power-Supply Input (HPV The headphone amplifiers are powered from HPV and PV . HPV is the positive supply of the head phone amplifiers and ranges ...
Page 19
... Large output, supply and GND traces also improve the power dissipation of the device. The MAX9789A/MAX9790A thin QFN package features an exposed thermal pad on its underside. This pad low- ers the package’s thermal resistance by providing a direct heat conduction path from the die to the printed circuit board ...
Page 20
... LOGIC PINS CONFIGURED FOR: LDO_EN = 1, LDO ENABLED SPKR_EN = 0, SPEAKER AMPLIFIERS ENABLED HP_EN = 1, HEADPHONE AMPLIFIER ENABLED MUTE = 1, MUTE DISABLED GAIN1 = 0 GAIN = 0, 6dB SPEAKER GAIN 20 ______________________________________________________________________________________ 4. MAX9789A 3 STEREO BTL AMPLIFIER 2 CONTROL LDO BLOCK GND PGND Block Diagrams 0.1µF ...
Page 21
Windows Vista-Compliant, Stereo Class AB Speaker Amplifiers and DirectDrive Headphone Amplifiers 1.0µF SPKR_INL 3 1.0µF 2 SPKR_INR 1.0µF HP_INL 27 1.0µF HP_INR 5.5V HP_EN 22 MUTE 25 SPKR_EN 23 CONTROL GAIN2 32 GAIN1 LOGIC ...
Page 22
... BULK BIAS 1µ 1µF SPKR_INL C IN 1µF SPKR_INR C IN 1µF HP_INR C IN 1µF HP_INL MAX9789A CPV DD 3 C1P C 1 LDO_SET 1µF C1N LDO_OUT SPKR_EN HP_EN LDO_EN GAIN1 GAIN2 CPGND MUTE PGND GND 100µF 0.47µF System Diagrams 5.0V 10µ ...
Page 23
... HP1_L HP2_R HP2_L C 3 1µF DGND AGND µC 1µF ______________________________________________________________________________________ System Diagrams (continued) +5V 0.1µ SPKR_INL SPKR_INR HP_INR HP_INL +3.3V MAX9789A CPV DD C1P C 1 1µF LDO_SET C1N SPKR_EN LDO_OUT HP_EN LDO_EN GAIN2 GAIN1 CPGND MUTE GND PGND SHDNR C1P SHDNL C1N 1µ ...
Page 24
... Windows Vista-Compliant, Stereo Class AB Speaker Amplifiers and DirectDrive Headphone Amplifiers TOP VIEW MUTE 25 HP_INR 26 27 HP_INL 28 GND MAX9789A 29 LDO_OUT GAIN1 + 32 GAIN2 TQFN *EP = EXPOSED PADDLE Simplified Block Diagrams SPEAKER SUPPLY HEADPHONE SUPPLY 4.5V TO 5.5V 3.0V TO 5.5V MAX9790A SPKR_INR SPKR_INL ...
Page 25
Windows Vista-Compliant, Stereo Class AB Speaker Amplifiers and DirectDrive Headphone Amplifiers (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) ______________________________________________________________________________________ Package Information 25 ...
Page 26
... 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. 26 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products Package Information (continued registered trademark of Maxim Integrated Products, Inc. ...