max9728a Maxim Integrated Products, Inc., max9728a Datasheet
max9728a
Available stocks
Related parts for max9728a
max9728a Summary of contents
Page 1
... DC-blocking capacitors, saving cost, board space, and component height. The MAX9728A offers an externally adjustable gain, while the MAX9728B has an internally preset gain of -1.5V/V. The MAX9728A/ MAX9728B deliver up to 60mW per channel into a 32Ω load and have low 0.02% THD+N. An 80dB at 1kHz ...
Page 2
... 0.3V, -9V) Junction Temperature ......................................................+150° Lead Temperature (soldering, 10s) .................................+300° above below ∞, resistive load reference to ground; for MAX9728A gain = -1.5V -40°C to +85°C, unless otherwise noted. Typical values A CONDITIONS SHDN = SGND = PGND t SON ...
Page 3
... Units are expressed in dB. _______________________________________________________________________________________ Amplifier with Shutdown = ∞, resistive load reference to ground; for MAX9728A gain = -1.5V -40°C to +85°C, unless otherwise noted. Typical values A ...
Page 4
... OUTPUT POWER vs. SUPPLY VOLTAGE 70 THD THD 1kHz 16Ω 4.5 5.0 SUPPLY VOLTAGE (V) = 20kΩ 30kΩ for the MAX9728A +25°C, unless otherwise noted.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 16Ω 20mW OUT 0 37mW OUT 0.01 ...
Page 5
... FREQUENCY (Hz) SUPPLY CURRENT vs. SUPPLY VOLTAGE 3.50 3.45 3.40 3.35 3.30 3.25 NO LOAD INPUTS GROUND 3.20 300 4.5 5.0 SUPPLY VOLTAGE (V) = 20kΩ 30kΩ for the MAX9728A +25°C, unless otherwise noted.) A CROSSTALK vs. FREQUENCY 15mW OUT R = 16Ω L -20 -40 -60 LEFT TO RIGHT -80 RIGHT TO LEFT -100 -120 ...
Page 6
... 1µ SHDN 5V/div V 1V/div V OUT_ 500mV/div FUNCTION and bypass with a 1µF ceramic capacitor to PGND 20kΩ 30kΩ for the MAX9728A +25°C, unless otherwise noted.) ENTERING SHUTDOWN IN_ µ 20 s/div Pin Description . SS ...
Page 7
... Typical Operating Characteristics for details of the possible capacitor sizes. There is a low DC voltage on the amplifier outputs due to amplifier off- set. However, the offsets of the MAX9728A/MAX9728B are typically 1.5mV, which, when combined with a 32Ω load, results in less than 47µ current flow to the headphones ...
Page 8
... Typically, the output of the device driving the MAX9728A/MAX9728B has a DC bias of half the supply voltage. At startup, the input-coupling capacitor is charged to the preamplifier’s DC-bias voltage through the input and feedback resistors of the MAX9728A/ MAX9728B, resulting shift across the capacitor and an audible click/pop ...
Page 9
... Functional Diagram/Typical Operating Circuits). The gain of the MAX9728A amplifier is set externally as shown in Figure 2, the gain is: Choose feedback resistor values in the tens of kΩ range. Lower values may cause excessive power dissi- ...
Page 10
... RMS plify power-supply design in some systems. When the MAX9728A is used as a line driver to provide outputs that feed stereo equipment (receivers, STBs, notebooks, and desktops) with a digital-to-analog con- verter (DAC) used as an audio input source often ...
Page 11
... DirectDrive, Stereo Headphone LEFT AUDIO INPUT STEREO DAC RIGHT AUDIO INPUT Figure 4. MAX9728A Line-Out Amplifier and Filter Block Configuration MAX9728A ACTIVE FILTER GAIN vs. FREQUENCY -10 -15 -20 -25 -30 -35 1k 10k FREQUENCY (Hz) Figure 5. Frequency Response of Active Filter of Figure 4 ______________________________________________________________________________________ Amplifier with Shutdown 15kΩ ...
Page 12
DirectDrive, Stereo Headphone Amplifiers with Shutdown µCONTROLLER STEREO DAC 12 ______________________________________________________________________________________ V DD 0.1µF 15kΩ 1µF 15kΩ INR OUTR OUTR- BIAS 1µF MAX9710 GND PGND MUTE OUTL- 0.1µF SHDN 15kΩ OUTL+ INL 15kΩ 100kΩ 0.1µF ...
Page 13
... Amplifier with Shutdown Functional Diagram/Typical Operating Circuits 0.47µF LEFT 20kΩ ON AUDIO INPUT 5 6 (8) (9) INL SHDN SV UVLO/ CLICK-AND-POP SUPPRESSION SGND V MAX9728A SV SGND INR 7 8 (10) (11 0.47µF 20kΩ RIGHT AUDIO INPUT 30kΩ (1) ...
Page 14
DirectDrive, Stereo Headphone Amplifiers with Shutdown Functional Diagram/Typical Operating Circuits (continued) 4.5V TO 5.5V C3 OFF 1µ (3) C1P CHARGE C1 PUMP 1µF 3 (5) C1N (7) (12) ...
Page 15
... TQFN ______________________________________________________________________________________ Amplifiers with Shutdown TOP VIEW 6 INL 5 SHDN TRANSISTOR COUNT: 993 PROCESS: BiCMOS Pin Configurations + OUTL 1 14 OUTR N.C. DD C1P MAX9728A PGND 4 11 INR MAX9728B C1N 5 10 SGND N. INL SHDN SS TSSOP Chip Information 15 ...
Page 16
DirectDrive, Stereo Headphone Amplifiers with Shutdown (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) MARKING D/2 D 0.10 C PKG 8L 3x3 12L 3x3 ...
Page 17
... Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 © 2006 Maxim Integrated Products M. Quijano Amplifiers with Shutdown Package Information (continued) Printed USA is a registered trademark of Maxim Integrated Products, Inc. PACKAGE OUTLINE, TSSOP 4.40mm BODY 1 21-0066 I 1 ...