Typical operating characteristics (continued) – Rainbow Electronics MAX9729 User Manual
Page 8
MAX9729
Stereo Headphone Amplifier with BassMax,
Volume Control, and Input Mux
8
_______________________________________________________________________________________
CROSSTALK vs. FREQUENCY
MAX9729 toc19
FREQUENCY (Hz)
CROSSTALK (dB)
10k
1k
100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-100
10
100k
GAIN = 3.5dB
V
OUT
= 1V
P-P
R
L
= 16
Ω
L TO R
R TO L
CROSSTALK vs. FREQUENCY
MAX9729 toc20
FREQUENCY (Hz)
CROSSTALK (dB)
10k
1k
100
0
-120
-100
-80
-60
-40
-20
10
100k
GAIN = 19.5dB
V
OUT
= 1V
P-P
R
L
= 16
Ω
L TO R
R TO L
BASS BOOST FREQUENCY
RESPONSE
-5
0
5
10
15
20
-10
MAX9729 toc21
FREQUENCY (Hz)
GAIN (dB)
10k
1k
100
10
100k
NO LOAD
R1 = 47k
Ω
DISABLED
R2 = 36k
Ω
C4 = 0.068
μF
R2 = 22k
Ω
C6 = 0.1
μF
R2 = 10k
Ω
C6 = 0.22
μF
-160
-120
-140
-100
-40
-20
-60
-80
0
0
4
6
8
10
2
12 14 16 18 20
OUTPUT SPECTRUM
MAX9729 toc22
FREQUENCY (kHz)
OUTPUT MAGNITUDE (dBV)
V
DD
= 3V
f
IN
= 1kHz
R
L
= 32
Ω
OUTPUT POWER vs. CHARGE-PUMP
CAPACITANCE AND LOAD RESISTANCE
MAX9729 toc23
LOAD RESISTANCE (
Ω)
OUTPUT POWER (mW)
40
20
10
30
50
60
0
10
20
30
40
50
0
60
V
DD
= 3V
f
IN
= 1kHz
THD+N = 1%
C1 = C2 = 0.68
μF
C1 = C2 = 1
μF
OUTPUT POWER vs. CHARGE-PUMP
CAPACITANCE AND LOAD RESISTANCE
MAX9729 toc24
LOAD RESISTANCE (
Ω)
OUTPUT POWER (mW)
40
20
30
50
10
5
10
15
20
25
30
35
40
0
0
60
V
DD
= 2.4V
f
IN
= 1kHz
THD+N = 1%
C1 = C2 = 0.68
μF
C1 = C2 = 1
μF
POWER-UP/POWER-DOWN
WAVEFORM
MAX9729 toc25
100ms/div
V
OUT_
10mV/div
V
DD
2V/div
EXITING SHUTDOWN
MAX9729 toc26
40
μs/div
V
OUT_
2V/div
V
SHDN
2V/div
ENTERING SHUTDOWN
MAX9729 toc27
40
μs/div
V
OUT_
2V/div
V
SHDN
2V/div
Typical Operating Characteristics (continued)
(V
DD
= PV
DD
=
SHDN = 3V, PGND = SGND = 0V, C1 = C2 = C3 = 1µF, C
IN
= 1µF (1206 case size, X7R dielectric ceramic capacitor),
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
A
= +25°C, unless otherwise noted.)