Maxim MAX9778 manual Typical Application Circuits, MAX9777

Page 21

Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux

Typical Application Circuits

				4.5V TO 5.5V
		0.1∝F					100∝F
				3, 4	11, 25
			17	VDD	PVDD		0.047∝F
			17	BIAS				27.4kΩ


	1∝F							33.2kΩ
						8		33.2kΩ
					GAINLB	8
					GAINLB				220∝F
						7		15kΩ	220∝F	10kΩ
								15kΩ		10kΩ
					GAINLA
					GAINLA
		15kΩ	5		OUTL+	10
		15kΩ		INL1	OUTL+


	0.68∝F
	0.68∝F				OUTL-	12
		15kΩ			OUTL-
			6
HPF				INL2


CODEC	0.68∝F			MAX9777
	0.68∝F	15kΩ	19	MAX9777
		15kΩ		INR1


	0.68∝F				OUTR-	26
		15kΩ			OUTR-
			20

HPF				INR2
HPF				INR2
	4.5V TO 5.5V				OUTR+	24
					OUTR+
									220∝F
						21		15kΩ	220∝F	4.5V TO 5.5V
					GAINRA	21
					GAINRA
1kΩ	1kΩ	10kΩ				22		33.2kΩ
					GAINRB	22			10kΩ
					GAINRB					680kΩ
								27.4kΩ		680kΩ
			28					27.4kΩ
			28	SCL
				SCL
			1	SDA			0.047∝F	47kΩ
				SDA		16
			15
MICROCONTROLLER			15	ADD	HPS
MICROCONTROLLER				ADD	HPS
			2	INT
				INT
			14	SHDN
				SHDN
				GND	PGND
				18	9, 13, 23, 27
______________________________________________________________________________________											21

MAX9777/MAX9778

Image 21

Contents MAX9778ETI+ Part Control PIN PKG Interface Package Code MAX9777ETI+Output Amplifiers Speaker MODE, HPS = GND Parameter Symbol Conditions MIN TYP MAX UnitsBias Voltage Bias Digital Inputs MUTE, SHDN, HPSEN, GAINA/B, IN1/2Headphone Sense Input HPS Timing Characteristics MAX9777 Total Harmonic Distortion Plus Noise Typical Operating CharacteristicsMAX9777/MAX9778 Entering Shutdown Speaker Mode RL = 32Ω Headphone Mode Power PIN Name Function Pin DescriptionInputs Gain Mode Hpsd SPKR/HP HPS Path BIT Headphone Sense EnableDetailed Description Input MultiplexerInputs Mode Gain Path Hpsen HPS MAX9778 HPS SettingDigital Interface Wire Serial-Interface Timing DiagramADD Connection 2C Address Early Stop ConditionAddress BIT Name Value Description RegisterRegister Address BIT Name Value DescriptionMAX9777 Control Register Format Applications Information Power Dissipation and Heat SinkingBTL Speaker Amplifiers Single-Ended Headphone AmplifierReducing Cout by Adding Rseries Component SelectionLayout and Grounding Gain SelectMAX9777 Typical Application CircuitsMAX9778 Pvdd Functional DiagramsPV DD Thin QFN Pin ConfigurationsPackage Information MAX9777/MAX9778