Instruction Manual

MAX9756/MAX9757/MAX9758
2.3W Stereo Speaker Amplifiers and DirectDrive
Headphone Amplifiers with Automatic Level Control
8 _______________________________________________________________________________________
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.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9756 toc19
OUTPUT POWER (mW)
THD+N (%)
10080604020
0.01
0.1
1
10
100
0.001
0120
HPV
DD
= 3.3V
R
L
= 16
Ω
f
IN
= 100Hz
f
IN
= 10kHz
f
IN
= 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9756 toc20
OUTPUT POWER (mW)
THD+N (%)
80 907040 50 60
30
10
20
0.01
0.1
1
10
100
0.001
0 100
HPV
DD
= 3.3V
R
L
= 32
Ω
f
IN
= 100Hz
f
IN
= 1kHz
f
IN
= 10kHz
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
MAX9756 toc21
LOAD RESISTANCE (
Ω
)
OUTPUT POWER (mW)
100
20
40
60
80
100
120
140
0
10 1000
HPV
DD
= 3.3V
f = 1kHz
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
MAX9756 toc22
LOAD RESISTANCE (
Ω
)
OUTPUT POWER (mW)
100
20
40
60
80
100
120
140
160
180
200
0
10 1000
HPV
DD
= 5V
f = 1kHz
THD+N = 10%
THD+N = 1%
POWER DISSIPATION vs. OUTPUT POWER
(HEADPHONE MODE)
MAX9756 toc23
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
225200175150125100755025
0.2
0.4
0.6
0.8
0
0 250
f = 1kHz
P
OUT
= P
HL
+ P
HR
R
L
= 16
Ω
R
L
= 32
Ω
OUTPUT POWER vs. SUPPLY VOLTAGE
(HEADPHONE MODE)
MAX9756 toc24
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
5.04.54.03.5
10
20
30
40
50
60
70
80
90
100
110
120
130
140
0
3.0 5.5
R
L
= 16
Ω
R
L
= 32
Ω
THD+N = 1%
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (HEADPHONE MODE)
MAX9756 toc25
FREQUENCY (Hz)
PSRR (dB)
10k1k100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-100
10 100k
V
RIPPLE
= 100mV
P-P
INPUTS AC-GROUNDED
HPV
DD
= 5V
HPV
DD
= 3.3V
CROSSTALK vs. FREQUENCY
(HEADPHONE MODE)
MAX9756 toc26
FREQUENCY (Hz)
CROSSTALK (dB)
1010.1
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-110
0.01 100
R
L
= 32
Ω
f = 1kHz
V
IN
= 200mV
P-P
RIGHT TO LEFT
LEFT TO RIGHT
OUTPUT POWER vs. CHARGE-PUMP
CAPACITANCE (HEADPHONE MODE)
MAX9756 toc27
LOAD (Ω)
OUTPUT POWER (mW)
3025
20
15
35 40
45
40
30
50
60
70
80
90
100
120
110
130
140
150
20
10 50
C1 = C2 = 1
μ
F
C1 = C2 = 2.2
μ
F
f = 1kHz
THD+N = 1%