Datasheet
MAX9850
Stereo Audio DAC with DirectDrive
Headphone Amplifier
_______________________________________________________________________________________ 9
10
0.001
10 100 10k 100k
TOTAL HARMONIC DISTORTION PLUS NOISE
(DAC TO HP) vs. FREQUENCY
0.01
0.1
1
MAX9850toc13
FREQUENCY (Hz)
THD+N (%)
1k
AV
DD
= 3.0V
R
L
= 32Ω
P
OUT
= 6mW
P
OUT
= 50mW
0
20
40
60
80
100
120
140
160
0 10203040
POWER DISSIPATION
vs. POWER OUT
MAX9850toc14
POWER OUT (mW)
POWER DISSIPATION (mW)
AV
DD
= PV
DD
= DV
DD
= 1.8V
P
OUT
= P
HPR
+ P
HPL
R
LOAD
= 16Ω
R
LOAD
= 32Ω
0
50
100
150
200
250
300
350
0 50 100 150
POWER DISSIPATION
vs. POWER OUT
MAX9850toc15
POWER OUT (mW)
POWER DISSIPATION (mW)
AV
DD
= PV
DD
= DV
DD
= 3.0V
P
OUT
= P
HPR
+ P
HPL
R
LOAD
= 16Ω
R
LOAD
= 32Ω
50
0
10 100 1000
POWER OUT
vs. HEADPHONE LOAD
10
5
MAX9850toc16
R
LOAD
(Ω)
POWER OUT (mW)
20
30
40
15
25
35
45
AV
DD
= 1.8V
LINE IN TO HP OUT
f
IN
= 1kHz
THD+N = 10%
THD+N = 1%
140
0
10 100 1000
POWER OUT
vs. HEADPHONE LOAD
MAX9850toc17
R
LOAD
(Ω)
POWER OUT (mW)
40
80
100
20
60
120
AV
DD
= 3.0V
LINE IN TO HP OUT
f
IN
= 1kHz
THD+N = 10%
THD+N = 1%
0
40
20
100
80
60
160
140
120
180
1.0 2.01.5 2.5 3.0 3.5 4.0
POWER OUT
vs. SUPPLY VOLTAGE
MAX9850toc18
SUPPLY VOLTAGE (V)
POWER OUT (mW)
THD+N = 10%
THD+N = 1%
R
L
= 16Ω
LINE IN TO HP OUT
f
IN
= 1kHz
0
30
20
10
60
50
40
90
80
70
100
1.0 2.01.5 2.5 3.0 3.5 4.0
POWER OUT
vs. SUPPLY VOLTAGE
MAX9850toc19
SUPPLY VOLTAGE (V)
POWER OUT (mW)
THD+N = 1%
R
L
= 32Ω
LINE IN TO HP OUT
f
IN
= 1kHz
THD+N = 10%
0
-10
-20
-30
-40
-50
-70
-80
-90
-120
10 100 10k 100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (DAC TO HP)
-110
-100
-60
MAX9850toc20
FREQUENCY (Hz)
PSRR (dB)
1k
AV
DD
= 1.8VDC
AV
DD
= 3.0VDC
R
LOAD
= 10kΩ
V
RIPPLE
APPLIED TO
AV
DD
AND PV
DD
= 100mV
P-P
CLOCKING ZEROS INTO DAC
VOLUME SET AT -9.5dB
0
-10
-20
-30
-40
-50
-70
-80
-90
-120
10 100 10k 100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (DAC TO LINE OUT)
-110
-100
-60
MAX9850toc21
FREQUENCY (Hz)
PSRR (dB)
1k
AV
DD
= 1.8VDC
AV
DD
= 3.0VDC
R
LOAD
= 10kΩ
V
RIPPLE
APPLIED TO
AV
DD
AND PV
DD
= 100mV
P-P
CLOCKING ZEROS INTO DAC
Typical Operating Characteristics (continued)
(DV
DD
= AV
DD
= PV
DD
= 3.0V, AGND = DGND = PGND = 0V, C1 = 0.47µF, C2 = 2.2µF, C
NREG
= C
PREG
= C
REF
= 1µF, f
S
= 48kHz,
f
MCLK
= 12.288MHz, master integer mode, headphone volume set to +6dB, both channels driven in-phase, T
A
= +25°C, unless
otherwise noted. f
IN
= 984.375Hz, A-weighted THD+N.)