Maxim MAX9778, MAX9777 Typical Operating Characteristics, Total Harmonic Distortion Plus Noise

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

Typical Operating Characteristics

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

TOTAL HARMONIC DISTORTION PLUS NOISE	TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)	vs. FREQUENCY (SPEAKER MODE)

1					toc01	1			RL = 3Ω	toc02
			RL = 3Ω
					MAX9777/78				AV = 4V/V	MAX9777/78
			AV = 2V/V
0.1						0.1
(%)	POUT = 500mW	POUT = 1W				(%)	POUT = 500mW	POUT = 1W
THD+N						THD+N
0.01						0.01		POUT = 2.5W
	POUT = 2W	POUT = 2.5W					POUT = 2W
0.001						0.001
10	100	1k	10k	100k		10	100	1k	10k	100k
		FREQUENCY (Hz)					FREQUENCY (Hz)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (SPEAKER MODE)

1		toc03
	RL = 4Ω
		MAX9777/78
	AV = 2V/V

0.1
(%)	POUT = 250mW
THD+N		POUT = 500mW
0.01
	POUT = 1W	POUT = 2W
0.001
10	100	1k	10k	100k
	FREQUENCY (Hz)

MAX9777/MAX9778

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (SPEAKER MODE)

TOTAL HARMONIC DISTORTION PLUS NOISE	TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)	vs. FREQUENCY (SPEAKER MODE)

	1			RL = 4Ω	toc04
					MAX9777/78
				AV = 4V/V
(%)	0.1
	POUT = 250mW		POUT = 500mW
THD+N
	0.01
		POUT = 1W	POUT = 2W
	0.001
	10	100	1k	10k	100k
			FREQUENCY (Hz)

1		toc05	1
	RL = 8Ω
		MAX9777/78
	AV = 2V/V

0.1				0.1
THD+N (%)	POUT = 250mW	POUT = 500mW		THD+N (%)
0.01				0.01
	POUT = 1W	POUT = 1.2W
0.001				0.001
10	100	1k	10k	100k
	FREQUENCY (Hz)

	toc06
RL = 8Ω
	MAX9777/78
AV = 4V/V

	POUT = 250mW	POUT = 500mW
	POUT = 1W	POUT = 1.2W
10	100	1k	10k	100k
	FREQUENCY (Hz)

TOTAL HARMONIC DISTORTION PLUS NOISE	TOTAL HARMONIC DISTORTION PLUS NOISE	TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)	vs. OUTPUT POWER (SPEAKER MODE)	vs. OUTPUT POWER (SPEAKER MODE)

	100	AV = 2V/V			toc07		100
					MAX9777/78
	10	RL = 3Ω					10
THD+N (%)	1					THD+N (%)	1
	0.1	f = 20Hz	f = 10kHz				0.1
	0.01	f = 1kHz					0.01
	0.001						0.001
	0	1	2	3	4
		OUTPUT POWER (W)

	AV = 4V/V			toc08	100
	RL = 3Ω			MAX9777/78
					10
		f = 10kHz		(%)	1
	f = 1kHz			THD+N
					0.1
	f = 20Hz				0.01
					0.001
0	1	2	3	4
		OUTPUT POWER (W)

	AV = 2V/V						toc09
							MAX9777/78
	RL = 4Ω
		f = 1kHz		f = 10kHz
		f = 20Hz
0	0.5	1.0	1.5	2.0	2.5	3.0	3.5

OUTPUT POWER (W)

_______________________________________________________________________________________ 5