Maxim MAX9778, MAX9777 manual Headphone Mode

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

Typical Operating Characteristics (continued)

(VDD = PVDD = 5V, GND = PGND = 0V, VSHDN = 5V, CBIAS = 1µF, TA = +25°C, unless otherwise noted.)

POWER DISSIPATION vs. OUTPUT POWER	POWER DISSIPATION vs. OUTPUT POWER	POWER-SUPPLY REJECTION RATIO
(HEADPHONE MODE)	(HEADPHONE MODE)	vs. FREQUENCY (HEADPHONE MODE)

	120				toc33		70
	100				MAX9777/78		60
(mW)						(mW)
	80						50
DISSIPATION						DISSIPATION
							40
	60						30
POWER	40					POWER	20
	20			RL = 16Ω			10
	0			f = 1kHz			0
		50	100	150	200
	0

					toc34		40
					MAX9777/78		50
							60
						(dB)
						PSRR	70
							80
				RL = 32Ω			90
				f = 1kHz
0	20	40	60	80	100		100

VRIPPLE = 200mVP-P

10 100 1k 10k

MAX9777/78 toc35

100k

MAX9777/MAX9778

OUTPUT POWER (mW) OUTPUT POWER (mW) FREQUENCY (Hz)

CROSSTALK vs. FREQUENCY

(HEADPHONE MODE)

	-40	VIN = 200mVP-P			toc36
					MAX9777/78
	-50	RL = 16Ω
	-60
(dB)	-70
CROSSTALK	-80	RIGHT TO LEFT
	-90
	-100
	-110	LEFT TO RIGHT
	-120
	10	100	1k	10k	100k

FREQUENCY (Hz)

ENTERING SHUTDOWN (HEADPHONE MODE)

MAX9777/78 toc38

SHDN 2V/div

OUT_+ 1V/div

HP JACK 100mV/div

100ms/div

EXITING SHUTDOWN (HEADPHONE MODE)

MAX9777/78 toc37

SHDN 2V/div

OUT_+ 1V/div

HP JACK 200mV/div

100ms/div

RL = 16Ω

INPUT AC-COUPLED TO GND

SUPPLY CURRENT vs. SUPPLY VOLTAGE

(SPEAKER MODE)

	25				toc39
	20	TA = +85°C			MAX9777/78
(mA)
CURRENT	15		TA = +25°C
SUPPLY	10
			TA = -40°C
	5
	0
	4.50	4.75	5.00	5.25	5.50

SUPPLY VOLTAGE (V)

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