MAX9729 Maxim Integrated Products, MAX9729 Datasheet - Page 8

• Manufacturer Part Number: MAX9729
• Description: Stereo Headphone Amplifier
• Manufacturer: Maxim Integrated Products

Stereo Headphone Amplifier with BassMax,
Volume Control, and Input Mux
8
(V
BM_ = 0V, maximum gain setting = 3.5dB, volume attenuation setting = 0dB (total voltage gain = 3.5dB), BassMax disabled. Load
connected between OUT_ and PGND where specified. THD+N measurement BW = 22Hz to 22kHz. Both channels loaded and driven
in phase. T
10mV/div
DD
2V/div
V
-100
-100
-120
-140
-160
OUT_
_______________________________________________________________________________________
V
-10
-20
-30
-40
-50
-60
-70
-80
-90
-20
-40
-60
-80
DD
= PV
0
0
10
0
V
f
R
GAIN = 3.5dB
V
R
IN
OUT
L
DD
L
DD
2
A
= 16Ω
= 1kHz
= 32Ω
= 3V
CROSSTALK vs. FREQUENCY
= +25°C, unless otherwise noted.)
= 1V
= SHDN = 3V, PGND = SGND = 0V, C1 = C2 = C3 = 1µF, C
POWER-UP/POWER-DOWN
4
100
P-P
OUTPUT SPECTRUM
6
FREQUENCY (kHz)
FREQUENCY (Hz)
WAVEFORM
8
100ms/div
L TO R
R TO L
10
1k
12 14 16 18 20
10k
MAX9729 toc25
100k
V
2V/div
2V/div
V
SHDN
OUT_
-100
-120
Typical Operating Characteristics (continued)
-20
-40
-60
-80
60
50
40
30
20
10
0
0
10
0
CAPACITANCE AND LOAD RESISTANCE
GAIN = 19.5dB
V
R
OUTPUT POWER vs. CHARGE-PUMP
OUT
L
= 16Ω
CROSSTALK vs. FREQUENCY
= 1V
10
100
P-P
EXITING SHUTDOWN
L TO R
R TO L
LOAD RESISTANCE (Ω)
C1 = C2 = 0.68μF
20
FREQUENCY (Hz)
40μs/div
1k
30
C1 = C2 = 1μF
IN
40
= 1µF (1206 case size, X7R dielectric ceramic capacitor),
10k
V
f
THD+N = 1%
IN
DD
= 1kHz
MAX9729 toc26
= 3V
50
100k
60
V
2V/div
2V/div
V
SHDN
OUT_
-10
40
35
30
25
20
15
10
20
15
10
-5
5
0
5
0
10
0
CAPACITANCE AND LOAD RESISTANCE
OUTPUT POWER vs. CHARGE-PUMP
DISABLED
10
C1 = C2 = 1μF
BASS BOOST FREQUENCY
R2 = 36kΩ
C4 = 0.068μF
ENTERING SHUTDOWN
100
R2 = 22kΩ
C6 = 0.1μF
LOAD RESISTANCE (Ω)
20
R2 = 10kΩ
C6 = 0.22μF
FREQUENCY (Hz)
RESPONSE
C1 = C2 = 0.68μF
40μs/div
30
1k
40
V
f
THD+N = 1%
10k
IN
DD
NO LOAD
R1 = 47kΩ
= 1kHz
MAX9729 toc27
= 2.4V
50
100k
60