Maxim manual Pin Description, MAX9777/MAX9778, Name, Function

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

Pin Description

	PIN		NAME	FUNCTION
MAX9777		MAX9778
1		—	SDA	Serial Data I/O
2		—	INT	Interrupt Output
3, 4		3, 4	VDD	Power-Supply Input
5		5	INL1	Left-Channel Input 1
6		6	INL2	Left-Channel Input 2
7		7	GAINLA	Left-Channel Gain Set A
8		8	GAINLB	Left-Channel Gain Set B
9, 13, 23, 27		9, 13, 23, 27	PGND	Power Ground. Connect to GND.
10		10	OUTL+	Left-Channel Bridged Amplifier Positive Output. OUTL+ also serves as the
				left-channel headphone amplifier output.
11, 25		11, 25	PVDD	Output Amplifier Power Supply
12		12	OUTL-	Left-Channel Bridged Amplifier Negative Output
14		14	SHDN	Active-Low Shutdown Input. Connect SHDN to VDD for normal operation.
15		—	ADD	Address Select. A logic-high sets the address LSB to 1, a logic-low sets the
				address LSB to zero.
				Headphone Sense Input. A logic-high configures the device as a single-
16		16	HPS	ended headphone amp. A logic-low configures the device as a BTL
				speaker amp.
17		17	BIAS	DC Bias Bypass Terminal. See the BIAS Capacitor section for capacitor
				selection. Connect CBIAS from BIAS to GND.
18		18	GND	Ground. Connect to PGND.
19		19	INR1	Right-Channel Input 1
20		20	INR2	Right-Channel Input 2
21		21	GAINRA	Right-Channel Gain Set A
22		22	GAINRB	Right-Channel Gain Set B
24		24	OUTR+	Right-Channel Bridged Amplifier Positive Output. OUTR+ also serves as the
				right-channel headphone amplifier output.
26		26	OUTR-	Right-Channel Bridged Amplifier Negative Output
28		—	SCL	Serial Clock Line
—		1	MUTE	Active-High Mute Input
—		2	HPS_EN	Headphone Enable. A logic-high enables HPS. A logic-low disables HPS
				and the device is always configured as a BTL speaker amplifier.
—		15	GAINA/B	Gain Select. A logic-low selects the gain set by GAIN_A. A logic-high
				selects the gain set by GAIN_B.
—		28	IN1/2	Input Select. A logic-low selects amplifier input 1. A logic-high selects
				amplifier input 2.
EP		EP	EP	Exposed Paddle. Connect to GND.

MAX9777/MAX9778

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