MAX9770 datasheet(8/24 Pages) MAXIM

Part #	MAX9770

Description	1.2W Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers

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Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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8 / 24 page

1.2W Low-EMI, Filterless, Mono Class D Amplifier

with Stereo DirectDrive Headphone Amplifiers

8

_______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VDD = 3.3V, BW = 22Hz to 22kHz, GAIN1 = 1, GAIN2 = 0, spread-spectrum mode, headphone outputs in phase.)

80

70

60

50

40

30

20

10

0

10

100

1000

OUTPUT POWER

vs. LOAD RESISTANCE (HEADPHONE MODE)

LOAD RESISTANCE (

Ω)

f = 1kHz

THD+N = 10%

THD+N = 1%

0

30

20

10

40

50

60

70

80

90

100

2.5

3.5

3.0

4.0

4.5

5.0

5.5

OUTPUT POWER

vs. SUPPLY VOLTAGE (HEADPHONE MODE)

SUPPLY VOLTAGE (V)

RL = 16

Ω

f = 1kHz

THD+N = 10%

THD+N = 1%

0

10

20

30

40

50

60

70

80

2.5

3.5

3.0

4.0

4.5

5.0

5.5

OUTPUT POWER

vs. SUPPLY VOLTAGE (HEADPHONE MODE)

SUPPLY VOLTAGE (V)

RL = 32

Ω

f = 1kHz

THD+N = 10%

THD+N = 1%

0

50

100

150

200

250

300

060

30

90

120

150

POWER DISSIPATION

vs. OUTPUT POWER (HEADPHONE MODE)

OUTPUT POWER (mW)

f = 1kHz

POUT = POUTL + POUTR

RL = 16

Ω

RL = 32

Ω

0

-100

10

100

1k

10k

100k

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY (HEADPHONE MODE)

-80

FREQUENCY (Hz)

-60

-40

-20

-30

-50

-70

-90

-10

VDD = 5V

VRIPPLE = 200mVP-P

RL = 32

Ω

0

-100

10

100

1k

10k

100k

CROSSTALK vs. FREQUENCY

(HEADPHONE MODE)

-80

FREQUENCY (Hz)

-60

-40

-20

-30

-50

-70

-90

-10

RL = 32

Ω

f = 1kHz

VIN = 200mVP-P

LEFT TO RIGHT

RIGHT TO LEFT

0

-100

10

100

1k

10k

100k

FEEDTHROUGH vs. FREQUENCY

-80

FREQUENCY (Hz)

-60

-40

-20

-30

-50

-70

-90

-10

SEL1 = 0

SEL2 = 1

IN1_ = GND

IN2_ = DRIVEN

VIN = 2VP-P

HEADPHONE MODE

SPEAKER MODE

0

10

30

20

50

40

60

20

30

40

50

OUTPUT POWER

vs. CHARGE-PUMP CAPACITANCE

LOAD (

Ω)

C1 = C2 = 1

µF

C1 = C2 = 0.47

µF

f = 1kHz

THD+N = 1%

-140

-100

-120

-60

-80

-20

-40

0

OUTPUT SPECTRUM

(HEADPHONE MODE)

FREQUENCY (kHz)

0

5

10

15

20

RL = 32

Ω

f = 1kHz

VIN = -60dBV

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