Instruction Manual

MAX9756/MAX9757/MAX9758
2.3W Stereo Speaker Amplifiers and DirectDrive
Headphone Amplifiers with Automatic Level Control
_______________________________________________________________________________________ 7
CROSSTALK vs. FREQUENCY
(SPEAKER MODE)
MAX9756 toc10
FREQUENCY (Hz)
CROSSTALK (dB)
10k1k100
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-110
10 100k
LEFT TO RIGHT
RIGHT TO LEFT
V
IN
= 200mV
P-P
TURN-ON RESPONSE (SPEAKER MODE)
MAX9756 toc11
10ms/div
SHDN
5V/div
OUT_+
2V/div
OUT_-
2V/div
OUT_+ - OUT_-
50mV/div
TURN-OFF RESPONSE (SPEAKER MODE)
MAX9756 toc12
10ms/div
SHDN
5V/div
OUT_+
2V/div
OUT_-
2V/div
OUT_+ - OUT_-
50mV/div
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9756 toc13
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
10
0.001
10 100k
V
DD
= 5V
R
L
= 16
Ω
OUTPUT POWER = 100mW
OUTPUT POWER = 40mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9756 toc14
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
10
0.001
10 100k
V
DD
= 5V
R
L
= 32
Ω
OUTPUT POWER = 20mW
OUTPUT POWER = 60mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9756 toc15
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
10
0.001
10 100k
V
DD
= 3.3V
R
L
= 16
Ω
OUTPUT POWER = 80mW
OUTPUT POWER = 20mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9756 toc16
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
10
0.001
10 100k
V
DD
= 3.3V
R
L
= 32
Ω
OUTPUT POWER = 50mW
OUTPUT POWER = 20mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9756 toc17
OUTPUT POWER (mW)
THD+N (%)
18016014012010080604020
0.01
0.1
1
10
100
0.001
0200
HPV
DD
= 5V
R
L
= 16
Ω
f
IN
= 100Hz
f
IN
= 10kHz
f
IN
= 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9756 toc18
OUTPUT POWER (mW)
THD+N (%)
908070605040302010
0.01
0.1
1
10
100
0.001
0100
HPV
DD
= 5V
R
L
= 32
Ω
f
IN
= 100Hz
f
IN
= 10kHz
f
IN
= 1kHz
Typical Operating Characteristics (continued)
(V
DD
= PV
DD
= HPV
DD
= CPV
DD
= IN = +5.0V, GND = PGND = CPGND = 0V, SHDN = V
DD
, REGEN = DR = SET = GND, C
BIAS
=
1µF, C
PVSS
= 1µF, C1 = C2 = 1µF, PREF = unconnected, GAIN1 = 1, GAIN2 = GAIN3 = VOL = 0V, measurement BW = 22Hz to
22kHz, T
A
= +25°C, unless otherwise noted.)