MAXIM MAX9850 Technical data
General Description
The MAX9850 is a low-power, high-performance stereo
audio DAC with an integrated DirectDrive headphone
amplifier. The MAX9850 is designed to meet the board
space and performance requirements of portable devices
such as cell phones and MP3 and portable DVD players.
The MAX9850 uses Maxim’s DirectDrive headphone
technology that produces a ground-biased analog
audio output from a single supply, which allows for driving the headphones directly from the amplifier outputs
without large DC-blocking capacitors. This feature
saves board space, provides higher click/pop suppression, and improves low-frequency (bass) response. The
architecture does not require the headphone jack to be
biased to a DC voltage and thus allows for a conventional, grounded chassis design.
The MAX9850’s flexible clocking circuitry utilizes any
available system clock up to 40MHz, eliminating the
need for an external PLL and multiple crystal oscillators.
The DAC supports a wide range of sample rates from
8kHz to 48kHz in both master and slave modes, making
the MAX9850 the easiest to use and most versatile audio
DAC available. It can also be operated like traditional
synchronous DACs, at any integer-oversampling ratio.
The audio DAC receives input data over a flexible
3-wire interface that supports left-justified, right-justified
audio data, or I2S-compatible audio data. Stereo audio
line inputs are provided to either mix analog audio with
the digital input stream, or to drive the headphone outputs directly. Mode settings, headphone amplifier volume controls, and shutdown for both the headphone
and line outputs are programmed through a 2-wire,
I
2
C-compatible interface.
The MAX9850 is fully specified over the -40°C to +85°C
extended temperature range and is available in a lowprofile, 28-pin thin QFN package (5mm x 5mm x 0.8mm).
Applications
MP3/Portable Multimedia Players
Cell Phones/Smart Phones
Portable DVD Players
Features
♦ 1.8V to 3.6V Single-Supply Operation
♦ 30mW Stereo Headphone Output Power with
1.8V Supply
♦ DirectDrive Outputs Eliminate DC-Blocking
Capacitors
♦ 91dB PSRR at 1kHz
♦ Any Master Clock Up to 40MHz
♦ Flexible I
2
S-Compatible Digital Audio Interface
♦ I
2
C Headphone Volume and Mute Control
♦ Stereo Line Inputs and Outputs
♦ Clickless/Popless Operation
♦ 2-Wire (I
2
C)-Compatible Control Interface
♦ Available in 28-Pin Thin QFN Package
MAX9850
Stereo Audio DAC with DirectDrive
Headphone Amplifier
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3454; Rev 3; 4/06
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
PART
TEMP RANGE
PIN-PACKAGE
PKG
CODE
MAX9850ETI+
T2855-6
Pin Configuration appears at end of data sheet.
+
DAC
+
DAC
DIGITAL
AUDIO
DIGITAL
PLL
I
2
C
MAX9850
SDIN
BCLK
LRCLK
SDA
SCL
ADD
GPIO
LINE
OUT
LINE
OUT
OUTR
HPR
HPL
OUTL
INL
INR
1.8V TO 3.6VMCLK
Block Diagram
**EP = Exposed pad.
+Denotes lead-free package.
-40°C to +85°C 28 TQFN-EP**
MAX9850
Stereo Audio DAC with DirectDrive
Headphone Amplifier
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(DVDD= AVDD= PVDD= 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, TA= T
MIN
to
T
MAX
, unless otherwise noted. Typical specifications at TA= +25°C, unless otherwise noted.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
(Voltages with respect to AGND.)
DV
DD
, AVDD, PVDD..................................................-0.3V to +4V
AV
DD
Referenced to PVDD....................................-0.3V to +0.3V
SV
SS
, PVSS...............................................................-4V to +0.3V
SV
SS
Referenced to PVSS.....................................-0.3V to +0.3V
DGND, PGND........................................................-0.3V to +0.3V
BCLK, LRCLK, HPS, SDIN.......................-0.3V to (DV
DD
+ 0.3V)
GPIO, MCLK.............................................................-0.3V to +4V
REF, PREG...............................................-0.3V to (AV
DD
+ 0.3V)
NREG ........................................................+0.3V to (SV
SS
- 0.3V)
SDA, SCL, ADD ........................................................-0.3V to +4V
INL, INR .......................................................................-2V to +2V
HPR, HPL.....................................(SV
SS
- 0.3V) to (AVDD+ 0.3V)
OUTL, OUTR .............................(NREG - 0.3V) to (PREG + 0.3V)
C1N ............................................(PV
SS
- 0.3V) to (PGND + 0.3V)
C1P ............................................(PGND - 0.3V) to (PV
DD
+ 0.3V)
Current Into/Out of Any Pin ...............................................100mA
Duration of HPL, HPR, OUTL,
OUTR Short Circuit to AGND .................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
28-Pin Thin QFN (derate 35.7mW/°C above +70°C) .....2857mW
Junction Temperature......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
CONDITIONS
UNITS
Analog Supply Voltage
AV
DD
,
PV
DD
AVDD = PV
DD
1.8 3.6 V
Digital Supply Voltage DV
DD
1.8 3.6 V
AVDD = 1.8V 5.5 7.7
Full operation (Note 2),
no headphone or line
output load
AV
DD
= 3.0V 5.9
AVDD = 1.8V 3.5 5.3
Analog Supply Current AI
DD
Full operation (Note 2),
headphones disabled
AV
DD
= 3.0V
mA
DVDD = 1.8V 2.1 2.9
Digital Supply Current DI
DD
Full operation (Note 2),
no line output load
DV
DD
= 3.0V 3.8
mA
Analog Shutdown Current
I
AVDD
+ I
PVDD, AVDD
= P
VDD
= 1.8V 1.5 10 µA
Digital Shutdown Current
Static digital interface, D
VDD
= 1.8V 0.3 5 µA
Shutdown to Full Operation
(Note 2)
t
ON
1.3 ms
Power-On to Full Operation
(Note 2)
t
PON
1.4 ms
DAC PERFORMANCE/LINE OUTPUTS (Note 3)
0dBFS Output Voltage
V
P-P
AVDD = 3.0V
Dynamic Range (Note 4) DR
AV
DD
= 1.8V 82
dB
Unweighted 88
A-weighted 91
AVDD = 1.8V, unweighted 88
Signal-to-Noise Ratio
(Note 5)
SNR
AV
DD
= 1.8V, A-weighted 91
dB
SYMBOL
MIN TYP MAX
AI
SHDN
DI
SHDN
V
OUT_FS
3.75
1.85 1.95 2.05
87.5
87.5
MAX9850
Stereo Audio DAC with DirectDrive
Headphone Amplifier
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(DVDD= AVDD= PVDD= 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, TA= T
MIN
to
T
MAX
, unless otherwise noted. Typical specifications at TA= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
UNITS
0dBFS 87
-60dBFS
AVDD = 1.8V,
0dBFS
-81
Total Harmonic Distortion Plus
Noise
fIN = 984.375Hz
AV
DD
= 1.8V,
-60dBFS
-22
dB
Line Output Offset Voltage
-15 0
mV
Channel-to-Channel Gain
Matching
OUTL to OUTR, OUTR to OUTL
dB
V
RIPPLE
= 100mV
P-P
, fIN = 1kHz, applied to
AV
DD
and PV
DD
87
Power-Supply Rejection Ratio PSRR
V
RIPPLE
= 100mV
P-P
, fIN = 20kHz, applied
to AV
DD
and PV
DD
67
dB
Crosstalk XTALK
f
OUT
= 1kHz, V
OUT
= 2V
P-P
(OUTL to OUTR) or (OUTR to OUTL)
dB
Sampling Frequency Range f
S
8 48 kHz
MCLK Frequency f
MCLK
40
MHz
DAC 8x INTERPOLATION FILTER
Passband Frequency PB To -1dB corner 0
0.48 x
f
S
kHz
Frequency Response FR 10Hz to 20kHz
dB
Stopband Attenuation SBA 58 dB
Stopband Frequency SB Attenuation greater than SBA
0.58 x
f
S
7.42 x
f
S
kHz
LINE INPUTS (INL, INR)
Line Input Voltage
-1 +1 V
IN_ to OUT_ Gain
-1
V/V
Line Input Bias Voltage
-15 0
mV
INL and INR Input Resistance
10 22 kΩ
INTERNAL REGULATORS (NREG, PREG)
PREG Output Voltage V
PREG
V
NREG Output Voltage V
NREG
V
REF Output Voltage V
REF
V
SYMBOL
THD+N
V
OS_LINE
ΔAV/AV
V
IN_LINE
A
V_LINE
V
BIAS_LINE
R
IN_LINE
MIN TYP MAX
27.5
-27.5
±0.04
-105
8.448
-0.1 +0.1
-1.05
1.60
-1.15
1.23
+15
-0.95
+15
MAX9850
Stereo Audio DAC with DirectDrive
Headphone Amplifier
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(DVDD= AVDD= PVDD= 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, TA= T
MIN
to
T
MAX
, unless otherwise noted. Typical specifications at TA= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
UNITS
HEADPHONE OUTPUTS (HPL, HPR)
RL = 16Ω
AV
DD
= 3.0V
95
RL = 32Ω
AV
DD
= 3.0V
40 65
RL = 16Ω
AV
DD
= 1.8V
30
Output Power OUT
THD+N = 1%
volume = +6dB
R
L
= 32Ω
AV
DD
= 1.8V
15 25
mW
Full-Scale Headphone Amplifier
Output Voltage
Volume = +5dB, HP unloaded
V
RMS
Line In to HP Output Voltage
Gain
A
V_HP
Volume = +3dB, HP unloaded
V/V
RL = 32Ω, P
OUT
= 60mW, fIN = 1kHz -94
Total Harmonic Distortion Plus
Noise
RL = 16Ω, P
OUT
= 60mW, fIN = 1kHz -90
dB
Unweighted 88
A-weighted 90
AVDD = 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
TA = +25°C -15
Headphone Output Offset
Voltage
Volume = -11.5dB
T
A
= T
MIN
to T
MAX
-25
mV
Slew Rate SR
V/µs
Maximum Capacitive Load C
L
No sustained oscillations
pF
Crosstalk XTALK
R
HP
= 32Ω, P
OUT
= 3.5mW, fIN = 1kHz
(HPL to HPR) or (HPR to HPL)
-85 dB
Channel-to-Channel Gain
Matching
ΔA
V/AV
dB
Internal Charge-Pump Oscillator
Frequency
f
CP
kHz
Charge-Pump Operating
Frequency Range
Charge-pump clock derived from MCLK
kHz
Volume Control Range
dB
SYMBOL
fIN = 1kHz, headphone
MIN TYP MAX
V
OUT_FS
THD+N
V
OS_HP
1.16 1.23 1.30
1.34 1.41 1.48
+15
+25
0.47
150
±0.05
550 667 775
550 775
-73.5 +6.0
MAX9850
Stereo Audio DAC with DirectDrive
Headphone Amplifier
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(DVDD= AVDD= PVDD= 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, TA= T
MIN
to
T
MAX
, unless otherwise noted. Typical specifications at TA= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
UNITS
Mute Attenuation
dB
DIGITAL INPUTS (GPIO, SCL, SDA, BCLK, LRCLK, SDIN, ADD, MCLK)
Input High Voltage V
IH
0.8 x
V
Input Low Voltage V
IL
0.2 x
V
Input Leakage Current IIH, I
IL
VIH = DVDD, VIL = DGND -10
µA
Input Hysteresis
0.09 x
V
Input Capacitance C
IN
10 pF
OPEN-DRAIN DIGITAL OUTPUTS (GPIO, SDA)
Output-High Leakage Current I
OH
VOH = DVDD (Note 7) 1 µA
DVDD > 2V 0.4
Output Low Voltage V
OL
IOL = 3mA
DV
DD
< 2V
0.2 x
V
CMOS DIGITAL OUTPUTS (BCLK, LRCLK)
Output High Voltage V
OH
IOH = 1mA
DV
DD
-
0.4
V
Output Low Voltage V
OL
IOL = 1mA 0.4 V
HEADPHONE SENSE INPUT (HPS)
Input High Voltage V
IH
0.7 x
V
Input Low Voltage V
IL
0.25 x
V
Full shutdown, VIH = DV
DD
Input-High Leakage Current I
IH
Normal operation, VIH = DV
DD
1
µA
Full shutdown, VIL = DGND 1
Input-Low Leakage Current I
IL
Normal operation, VIL = DGND
µA
Input Hysteresis
0.05 x
V
SYMBOL
MIN TYP MAX
100
DV
DD
DV
DV
DD
+10
DD
DV
DD
DV
DD
DV
DD
DV
DD
400
100
MAX9850
Stereo Audio DAC with DirectDrive
Headphone Amplifier
6 _______________________________________________________________________________________
TIMING CHARACTERISTICS
(DVDD= AVDD= PVDD= 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_LINE
= 10kΩ to AGND, f
LRCLK
= 48kHz, f
MCLK
= 12.288MHz, volume set to -9.5dB, TA= T
MIN
to
T
MAX
, unless otherwise noted. Typical specifications at TA= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
UNITS
I2C TIMING
Serial Clock Frequency f
SCL
0
kHz
Bus Free Time Between STOP
and START Conditions
t
BUF
1.3 µs
Hold Time (Repeated) START
Condition
0.6 µs
SCL Pulse-Width Low t
LOW
1.3 µs
SCL Pulse-Width High t
HIGH
0.6 µs
Repeated START Condition
Setup Time
0.6 µs
Data Hold Time
0
ns
Data Setup Time
ns
Bus Capacitance C
B
pF
SDA and SCL Receiving Rise
Time (Note 8)
t
R
20 +
ns
SDA and SCL Receiving Fall
Time (Note 8)
t
F
20 +
ns
DVDD = 1.8V, TA = +25°C
20 +
SDA Transmitting Fall Time
(Note 8)
t
F
DVDD = 3.6V, TA = +25°C
20 +
ns
Setup Time for STOP Condition
0.6 µs
Pulse Width of Suppressed Spike
t
SP
050ns
DIGITAL AUDIO TIMING
BCLK Period (Note 9) t
BCLK
ns
Low or High BCLK Pulse Width
0.35 x
ns
BCLK and LRCLK Rise Time t
R
Master mode, C
LOAD
= 15pF 1 ns
BCLK and LRCLK Fall Time t
F
Master mode, C
LOAD
= 15pF 1 ns
SDIN or LRCLK to BCLK Rising
Setup Time
t
DBSU,
t
BWSU
30 ns
DVDD = 1.8V 0
SDIN or LRCLK to BCLK Rising
Hold Time
t
DBH,
t
BWBH
DVDD = 3.6V 5
ns
Note 1: The MAX9850 is 100% production tested at TA= +25°C and is guaranteed by design for TA= T
MIN
to T
MAX
.
Note 2: Full operation is defined as clocking all zeros into the DAC while the DAC, headphone outputs, and line outputs are all enabled.
Note 3: DAC performance specifications measured using the line outputs, OUTL and OUTR.
Note 4: Dynamic range is defined as the SNR of a 1kHz, -60dBFS input signal measured with an A-weighted filter, then normalized
to full scale (+60dB).
SYMBOL
t
HD, STA
t
SU, STA
t
HD, DAT
t
SU, DAT
t
SU, STO
t
BCLK_PW
MIN TYP MAX
100
0.1C
B
0.1C
B
0.1C
B
0.05C
B
1 / f
3 x
IC LK
t
BCLK
400
900
400
300
300
250
250
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
< VOH< 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 AVDD= 1.8V (No Headphone/Line Output Load)
MODE AVDD POWER DVDD POWER PVDD 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
(DVDD= AVDD= PVDD= 3.0V, AGND = DGND = PGND = 0V, C1 = 0.47µF, C2 = 2.2µF, C
NREG
= C
PREG
= C
REF
= 1µF, fS= 48kHz,
f
MCLK
= 12.288MHz, master integer mode, headphone volume set to +6dB, both channels driven in-phase, TA= +25°C, unless
otherwise noted. f
IN
= 984.375Hz, A-weighted THD+N.)
TOTAL HARMONIC DISTORTION PLUS NOISE
10
1
0.1
THD+N (%)
0.01
0.001
(DAC TO HP) vs. POWER OUT
AVDD = 1.8V
= 16
R
Ω
L
fIN = 10kHz
fIN = 20Hz
02010 40 60
POWER OUT (mW)
fIN = 1kHz
30 50
MAX9850toc01
TOTAL HARMONIC DISTORTION PLUS NOISE
(LINE IN TO HP) vs. POWER OUT
10
AVDD = 1.8V
= 16
R
Ω
L
1
0.1
THD+N (%)
0.01
0.001
fIN = 1kHz
fIN = 10kHz
fIN = 20Hz
02010 40 60
30 50
POWER OUT (mW)
MAX9850toc02
TOTAL HARMONIC DISTORTION PLUS NOISE
(DAC TO HP) vs. POWER OUT
10
AVDD = 1.8V
= 32
R
Ω
L
1
0.1
THD+N (%)
0.01
fIN = 10kHz
0.001
02010 40 50
POWER OUT (mW)
30
fIN = 1kHz
fIN = 20Hz
MAX9850toc03
MAX9850
Stereo Audio DAC with DirectDrive
Headphone Amplifier
8 _______________________________________________________________________________________
10
0.001
10 100 10k 100k
TOTAL HARMONIC DISTORTION PLUS NOISE
(DAC TO HP) vs. FREQUENCY
0.01
0.1
1
MAX9850toc09
FREQUENCY (Hz)
THD+N (%)
1k
AVDD = 1.8V
R
L
= 16Ω
P
OUT
= 5mW
P
OUT
= 21mW
10
0.001
10 100 10k 100k
TOTAL HARMONIC DISTORTION PLUS NOISE
(DAC TO HP) vs. FREQUENCY
0.01
0.1
1
MAX9850toc10
FREQUENCY (Hz)
THD+N (%)
1k
AVDD = 1.8V
R
L
= 32Ω
P
OUT
= 3mW
P
OUT
= 15mW
10
0.001
10 100 10k 100k
TOTAL HARMONIC DISTORTION PLUS NOISE
(DAC TO LINE OUT) vs. FREQUENCY
0.01
0.1
1
MAX9850toc11
FREQUENCY (Hz)
THD+N (%)
1k
AVDD = 1.8V TO 3.0V
R
L
= 10kΩ
V
OUT
= 2V
P-P
10
0.001
10 100 10k 100k
TOTAL HARMONIC DISTORTION PLUS NOISE
(DAC TO HP) vs. FREQUENCY
0.01
0.1
1
MAX9850toc12
FREQUENCY (Hz)
THD+N (%)
1k
AVDD = 3.0V
R
L
= 16Ω
P
OUT
= 10mW
P
OUT
= 60mW
Typical Operating Characteristics (continued)
(DVDD= AVDD= PVDD= 3.0V, AGND = DGND = PGND = 0V, C1 = 0.47µF, C2 = 2.2µF, C
NREG
= C
PREG
= C
REF
= 1µF, fS= 48kHz,
f
MCLK
= 12.288MHz, master integer mode, headphone volume set to +6dB, both channels driven in-phase, TA= +25°C, unless
otherwise noted. fIN= 984.375Hz, A-weighted THD+N.)
TOTAL HARMONIC DISTORTION PLUS NOISE
(LINE IN TO HP) vs. POWER OUT
10
AVDD = 1.8V
= 32
R
Ω
L
1
0.1
THD+N (%)
fIN = 1kHz
MAX9850toc04
TOTAL HARMONIC DISTORTION PLUS NOISE
(DAC TO HP) vs. POWER OUT
10
AVDD = 3.0V
= 16
R
Ω
L
1
fIN = 1kHz
0.1
THD+N (%)
fIN = 10kHz
MAX9850toc05
TOTAL HARMONIC DISTORTION PLUS NOISE
(LINE IN TO HP) vs. POWER OUT
10
AVDD = 3.0V
= 16
R
Ω
L
1
0.1
THD+N (%)
fIN = 1kHz
fIN = 20Hz
fIN = 10kHz
MAX9850toc06
0.01
0.001
02010 40 50
POWER OUT (mW)
fIN = 10kHz
fIN = 20Hz
30
TOTAL HARMONIC DISTORTION PLUS NOISE
(DAC TO HP) vs. POWER OUT
10
AVDD = 3.0V
= 32
R
Ω
L
1
0.1
THD+N (%)
0.01
0.001
04020 100
fIN = 1kHz
fIN = 10kHz
60 80
POWER OUT (mW)
fIN = 20Hz
MAX9850toc07
0.01
fIN = 20Hz
0.001
04020 100
POWER OUT (mW)
60 80
TOTAL HARMONIC DISTORTION PLUS NOISE
(LINE IN TO HP) vs. POWER OUT
10
AVDD = 3.0V
= 32Ω
R
L
1
0.1
THD+N (%)
0.01
0.001
fIN = 1kHz
fIN = 10kHz
04020 100
POWER OUT (mW)
fIN = 20Hz
60 80
MAX9850toc08
0.01
0.001
04020 100
POWER OUT (mW)
60 80
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
AVDD = 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)
AVDD = PVDD = DVDD = 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)
AVDD = PVDD = DVDD = 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
AVDD = 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
AVDD = 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%
RL = 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%
RL = 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
AVDD = 1.8VDC
AV
DD
= 3.0VDC
R
LOAD
= 10kΩ
V
RIPPLE
APPLIED TO
AV
DD
AND PVDD = 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
AVDD = 1.8VDC
AV
DD
= 3.0VDC
R
LOAD
= 10kΩ
V
RIPPLE
APPLIED TO
AV
DD
AND PVDD = 100mV
P-P
CLOCKING ZEROS INTO DAC
Typical Operating Characteristics (continued)
(DVDD= AVDD= PVDD= 3.0V, AGND = DGND = PGND = 0V, C1 = 0.47µF, C2 = 2.2µF, C
NREG
= C
PREG
= C
REF
= 1µF, fS= 48kHz,
f
MCLK
= 12.288MHz, master integer mode, headphone volume set to +6dB, both channels driven in-phase, TA= +25°C, unless
otherwise noted. fIN= 984.375Hz, A-weighted THD+N.)
MAX9850
Stereo Audio DAC with DirectDrive
Headphone Amplifier
10 ______________________________________________________________________________________
-40
-50
-60
-70
-80
-90
-110
-120
10 100 10k 100k
CROSSTALK vs. FREQUENCY
(DAC IN TO HP OUT)
-100
MAX9850toc22
FREQUENCY (Hz)
CROSSTALK (dB)
1k
L TO R
R TO L
VOLUME SET TO -9.5dB
DAC IN = 0dBFS
R
LOAD
= 32Ω
-40
-50
-60
-70
-80
-90
-110
-120
10 100 10k 100k
CROSSTALK vs. FREQUENCY
(LINE IN TO HP OUT)
-100
MAX9850toc23
FREQUENCY (Hz)
CROSSTALK (dB)
1k
L TO R
R TO L
VOLUME SET TO -9.5dB
LINE IN = 1V
RMS
R
LOAD
= 32Ω
-40
-50
-60
-70
-80
-90
-110
-120
10 100 10k 100k
CROSSTALK vs. FREQUENCY
(DAC IN TO LINE OUT)
-100
MAX9850toc24
FREQUENCY (Hz)
CROSSTALK (dB)
1k
L TO R
R TO L
VOLUME SET TO -9.5dB
DAC IN = 0dBFS
-140
-100
-120
-60
-80
-20
-40
0
FFT, SLAVE NONINTEGER MODE
(DAC IN = 0dBFS)
MAX9850toc25
FREQUENCY (kHz)
LINE OUT (dBFS)
0 5 10 15 20
LINE OUT
f
IN
= 1kHz
f
MCLK
= 12MHz
-140
-100
-120
-60
-80
-20
-40
0
FFT, SLAVE NONINTEGER MODE
(DAC IN = -60dBFS)
MAX9850toc26
FREQUENCY (kHz)
LINE OUT (dBFS)
0 5 10 15 20
LINE OUT
f
IN
= 1kHz
f
MCLK
= 12MHz
-140
-100
-120
-60
-80
-20
-40
0
FFT, SLAVE NONINTEGER MODE
(DAC IN = IDLE)
MAX9850toc27
FREQUENCY (Hz)
LINE OUT (dBFS)
0 5 10 15 20
LINE OUT
f
MCLK
= 12MHz
-140
-100
-120
-60
-80
-20
-40
0
FFT, MASTER INTEGER MODE
(DAC IN = 0dBFS)
MAX9850toc28
FREQUENCY (Hz)
LINE OUT (dBFS)
0 5 10 15 20
LINE OUT
f
IN
= 1kHz
f
MCLK
= 12.288MHz
-140
-100
-120
-60
-80
-20
-40
0
FFT, MASTER INTEGER MODE
(DAC IN = -60dBFS)
MAX9850toc29
FREQUENCY (Hz)
LINE OUT (dBFS)
0 5 10 15 20
LINE OUT
f
IN
= 1kHz
f
MCLK
= 12.288MHz
-140
-100
-120
-60
-80
-20
-40
0
FFT, MASTER INTEGER MODE
(DAC IN = IDLE)
MAX9850toc30
FREQUENCY (Hz)
LINE OUT (dBFS)
0 5 10 15 20
LINE OUT
f
MCLK
= 12.288MHz
Typical Operating Characteristics (continued)
(DVDD= AVDD= PVDD= 3.0V, AGND = DGND = PGND = 0V, C1 = 0.47µF, C2 = 2.2µF, C
NREG
= C
PREG
= C
REF
= 1µF, fS= 48kHz,
f
MCLK
= 12.288MHz, master integer mode, headphone volume set to +6dB, both channels driven in-phase, TA= +25°C, unless
otherwise noted. fIN= 984.375Hz, A-weighted THD+N.)
MAX9850
Stereo Audio DAC with DirectDrive
Headphone Amplifier
______________________________________________________________________________________ 11
1.0
0.8
0.4
0.6
0.2
0
-0.2
-0.4
-0.8
-1.0
10 100 10k 100k
GAIN FLATNESS
vs. FREQUENCY
-0.6
MAX9850toc31
FREQUENCY (Hz)
GAIN (dB)
1k
R
LOAD
= 32Ω
DAC IN TO HP
DAC IN = 0dBFS
60
70
65
80
75
95
90
85
100
SNR vs. MCLK FREQUENCY
MAX9850toc32
MCLK FREQUENCY (MHz)
SNR (dB)
510203015 25 35 40
SLAVE NONINTEGER MODE
DAC IN = -60dBFS
f
LRCLK
= 32kHz, 44.1kHz, 48kHz
AV
DD
= 3.0V
f
ICLK
= f
MCLK
/ 1
f
ICLK
= f
MCLK
/ 2
f
ICLK
= f
MCLK
/ 3
f
ICLK
= f
MCLK
/ 4
20
0
-20
-40
-60
-80
-120
-140
10 100 10k 100k
WIDEBAND FFT
-100
MAX9850toc33
FREQUENCY (Hz)
V
OUT
(dBFS)
1k
DAC IN = 0dBFS
DAC IN TO LINE OUT
f
IN
= 1kHz
20
0
-20
-40
-60
-80
-120
-140
10 100 10k 100k
WIDEBAND FFT
-100
MAX9850toc34
FREQUENCY (Hz)
V
OUT
(dBFS)
1k
DAC IN = -60dBFS
DAC IN TO LINE OUT
f
IN
= 1kHz
10
15
20
25
30
35
40
-40 -15 3510 60 85
OUTPUT POWER
vs. TEMPERATURE
MAX9850toc35
TEMPERATURE (°C)
OUTPUT POWER (mW)
AVDD = 1.8V
THD+N = 1%
R
LOAD
= 16Ω
R
LOAD
= 32Ω
2
4
6
3
5
7
8
9
10
1.8 2.2 3.02.6 3.42.0 2.82.4 3.2 3.6
AVDD AND PVDD SUPPLY CURRENT
vs. AV
DD
AND PVDD SUPPLY VOLTAGE
MAX9850toc36
AVDD AND PVDD (V)
AV
DD
+ PV
DD
SUPPLY CURRENT (mA)
TA = +85°C
TA = +25°C
TA = -40°C
0
2
4
1
3
6
8
5
7
9
10
1.0 2.0 3.01.5 3.52.5 4.0
DIGITAL SUPPLY CURRENT
vs. DV
DD
MAX9850toc37
DVDD (V)
DIGITAL SUPPLY CURRENT (mA)
TA = +85°C, +25°C, -40°C
Typical Operating Characteristics (continued)
(DVDD= AVDD= PVDD= 3.0V, AGND = DGND = PGND = 0V, C1 = 0.47µF, C2 = 2.2µF, C
NREG
= C
PREG
= C
REF
= 1µF, fS= 48kHz,
f
MCLK
= 12.288MHz, master integer mode, headphone volume set to +6dB, both channels driven in-phase, TA= +25°C, unless
otherwise noted. fIN= 984.375Hz, A-weighted THD+N.)
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