Datasheet

MAX9850
Stereo Audio DAC with DirectDrive
Headphone Amplifier
_______________________________________________________________________________________ 7
Note 5: DAC SNR measured from DAC inputs to OUTL and OUTR.
Note 6: Headphone amplifier SNR measured from line inputs to headphone outputs.
Note 7: GPIO is 100kΩ to ground when DV
DD
< V
OH
< 3.6V.
Note 8: C
B
is in pF.
Note 9: f
ICLK
derived by dividing f
MCLK
by 1, 2, 3, or 4. See the Registers and Bit Descriptions section.
TYPICAL POWER DISSIPATION AT AV
DD
= 1.8V (No Headphone/Line Output Load)
MODE AV
DD
POWER DV
DD
POWER PV
DD
POWER
TOTAL POWER
Full Operation (Note 1) 4.93mW 3.76mW 5.00mW 13.70mW
DAC to Line Outputs, Headphones Disabled 3.11mW 3.76mW 3.22mW 10.10mW
Line Inputs to Line Outputs and Headphone
Outputs, DAC Disabled
3.22mW 0.085mW 3.40mW 6.71mW
Line Inputs to Line Outputs, DAC and
Headphones Disabled
1.39mW 0.085mW 1.61mW 3.08mW
Full Shutdown 2.7µW 0.5µW <0.1µW 3.2µW
Typical Operating Characteristics
(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.)
10
0.001
02010 40 60
TOTAL HARMONIC DISTORTION PLUS NOISE
(DAC TO HP) vs. POWER OUT
0.01
0.1
1
MAX9850toc01
POWER OUT (mW)
THD+N (%)
30 50
AV
DD
= 1.8V
R
L
= 16
Ω
f
IN
= 1kHz
f
IN
= 10kHz
f
IN
= 20Hz
10
0.001
02010 40 60
TOTAL HARMONIC DISTORTION PLUS NOISE
(LINE IN TO HP) vs. POWER OUT
0.01
0.1
1
MAX9850toc02
POWER OUT (mW)
THD+N (%)
30 50
AV
DD
= 1.8V
R
L
= 16
Ω
f
IN
= 1kHz
f
IN
= 10kHz
f
IN
= 20Hz
10
0.001
02010 40 50
TOTAL HARMONIC DISTORTION PLUS NOISE
(DAC TO HP) vs. POWER OUT
0.01
0.1
1
MAX9850toc03
POWER OUT (mW)
THD+N (%)
30
AV
DD
= 1.8V
R
L
= 32
Ω
f
IN
= 1kHz
f
IN
= 10kHz
f
IN
= 20Hz