MAX9726 Maxim Integrated Products, MAX9726 Datasheet - Page 7

• Manufacturer Part Number: MAX9726
• Description: Headphone Amplifier
• Manufacturer: Maxim Integrated Products

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4
(V
ume (overall gain = 0dB), BassMax disabled. Load connected between OUT_ and PGND where specified. Outputs in phase, both
channels loaded. T
DD
-100
-110
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
= SHDN = 5V, PGND = SGND = 0V, C1 = C2 = 1µF, C
10
POWER-SUPPLY REJECTION RATIO
100
-100
-100
-120
-140
-40
-50
-60
-70
-80
-90
-20
-40
-60
-80
vs. FREQUENCY
FREQUENCY (Hz)
0
A
10
0
_______________________________________________________________________________________
= +25°C, unless otherwise noted.) (See the Functional Diagram/Typical Operating Circuit)
V
R
G = -10dB
BassMax, I
IN
L
1k
= 32Ω
= 1V
V
R
CROSSTALK vs. FREQUENCY
DirectDrive, Headphone Amplifier with
DD
IN
P-P
= R
100
= 5V + 100mV
5
F
= 10kΩ
10k
FREQUENCY (kHz)
FREQUENCY (Hz)
OUTPUT FFT
1k
10
P-P
LEFT TO RIGHT
RIGHT TO LEFT
100k
V
ATTEN = 60dB
V
R
f
V
IN
IN
OUT
L
DD
= 320Ω
= 1kHz
= 100mV
= 5V
10k
= -60dBV
15
-100
-110
Typical Operating Characteristics (continued)
-10
-20
-30
-40
-50
-60
-70
-80
-90
RMS
0
10
100k
20
2
POWER-SUPPLY REJECTION RATIO
C, Volume and Gain Control
100
PREG
vs. FREQUENCY
FREQUENCY (Hz)
= C
1k
V
R
NREG
DD
IN
= R
= 3.3V + 100mV
F
= 10kΩ
= 1µF, BM_ = 0V, R
10k
160
150
140
130
120
110
100
40
35
30
25
20
15
10
90
80
70
60
10
P-P
1
CAPACITANCE AND LOAD RESISTANCE
100k
OUTPUT POWER vs. CHARGE-PUMP
BassMax FREQUENCY RESPONSE
15
BassMax DISABLED
C1 = C2 = 1µF
10
20
LOAD RESISTANCE (Ω)
-100
-110
-120
C1 = C2 = 2.2µF
-60
-70
-80
-90
FREQUENCY (Hz)
C1 = C2 = 0.68µF
25
IN
R2 = 36kΩ
C3 = 0.068µF
100
R2 = 22kΩ
C3 = 0.1µF
10
= 10kΩ, R
R2 = 10kΩ
C3 = 0.22µF
V
R
G = 0dB
30
IN
L
= 32Ω
= 1V
CROSSTALK vs. FREQUENCY
RIGHT TO LEFT
1k
35
LEFT TO RIGHT
P-P
100
V
THD+N = 1%
f
40
DD
IN
F
R1 = 47kΩ
R
FREQUENCY (Hz)
10k
L
= 1kHz
= 10kΩ, maximum vol-
= 5V
= 32Ω
45
1k
100k
50
10k
100k
7