Datasheet

MAX9850
Stereo Audio DAC with DirectDrive
Headphone Amplifier
4 _______________________________________________________________________________________
ELECTRICAL 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 to AGND,
R
LOAD_HP
= 32Ω to AGND, R
LOAD_OUT
= 10kΩ to AGND, f
LRCLK
= 48kHz, f
MCLK
= 12.288MHz, volume set to -9.5dB, T
A
= T
MIN
to
T
MAX
, unless otherwise noted. Typical specifications at T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
HEADPHONE OUTPUTS (HPL, HPR)
R
L
= 16Ω
AV
DD
= 3.0V
95
R
L
= 32Ω
AV
DD
= 3.0V
40 65
R
L
= 16Ω
AV
DD
= 1.8V
30
Output Power OUT
THD+N = 1%
f
IN
= 1kHz, headphone
volume = +6dB
R
L
= 32Ω
AV
DD
= 1.8V
15 25
mW
Full-Scale Headphone Amplifier
Output Voltage
V
OUT_FS
Volume = +5dB, HP unloaded
1.16 1.23 1.30
V
RMS
Line In to HP Output Voltage
Gain
A
V_HP
Volume = +3dB, HP unloaded
1.34 1.41 1.48
V/V
R
L
= 32Ω, P
OUT
= 60mW, f
IN
= 1kHz -94
Total Harmonic Distortion Plus
Noise
THD+N
R
L
= 16Ω, P
OUT
= 60mW, f
IN
= 1kHz -90
dB
Unweighted 88
A-weighted 90
AV
DD
= 1.8V, unweighted 88
Signal-to-Noise Ratio (Note 6) SNR
AV
DD
= 1.8V, A-weighted 91
dB
V
RIPPLE
= 100mV
P-P
, frequency = 1kHz,
applied to AV
DD
and PV
DD
91
Power-Supply Rejection Ratio PSRR
V
RIPPLE
= 100mV
P-P
, frequency = 20kHz,
applied to AV
DD
and PV
DD
72
dB
T
A
= +25°C -15
+15
Headphone Output Offset
Voltage
V
OS_HP
Volume = -11.5dB
T
A
= T
MIN
to T
MAX
-25
+25
mV
Slew Rate SR
0.47
V/µs
Maximum Capacitive Load C
L
No sustained oscillations
150
pF
Crosstalk XTALK
R
HP
= 32Ω, P
OUT
= 3.5mW, f
IN
= 1kHz
(HPL to HPR) or (HPR to HPL)
-85 dB
Channel-to-Channel Gain
Matching
ΔA
V
/A
V
±0.05
dB
Internal Charge-Pump Oscillator
Frequency
f
CP
550 667 775
kHz
Charge-Pump Operating
Frequency Range
Charge-pump clock derived from MCLK
550 775
kHz
Volume Control Range
-73.5 +6.0
dB