19-0550; Rev 0; 5/06
Low-Cost Stereo Audio DACs
General Description
The MAX5556–MAX5559 stereo audio sigma-delta
digital-to-analog converters (DACs) offer a simple and
complete stereo digital-to-analog solution for media
servers, set-top boxes, video-game hardware, automo-
tive rear-seat entertainment and other general consumer
audio applications. These DACs feature built-in digital
interpolation/filtering, sigma-delta digital-to-analog con-
version and analog output filtering. Control logic and
mute circuitry minimize audible pops and clicks during
power-up, power-down, clock changes, or when invalid
clock conditions occur.
The MAX5556–MAX5559 receive input data over a flexi-
ble 3-wire interface, supporting I
2
S-compatible, left-jus-
tified, right-justified 16-bit, and right-justified 18-bit
audio data. Data can be clocked by either an external
or internal serial clock. The internal serial clock frequen-
cy is programmable by selection of a master clock
(MCLK) and sample clock (LRCLK) ratio. Sampling
rates from 2kHz to 50kHz are supported.
The MAX5556–MAX5559 operate from a single +4.75V
to +5.5V analog supply with total harmonic distortion
plus noise below -87dB. These devices are available in
8-pin SO packages and are specified over the -40°C to
+85°C industrial temperature range.
Features
♦
Simple and Complete Stereo Audio DAC
Solutions, No Controls to Set
♦
Sigma-Delta Stereo DACs with Built-In
Interpolation and Analog Output Filters
♦
I
2
S-Compatible Digital Audio Interface (MAX5556)
♦
Clickless/Popless Operation
♦
Output Voltage Swing: 3.5V
P-P
♦
-87dB THD+N
♦
+87dB Dynamic Range
♦
Sample Frequencies (f
S
) from 2kHz to 50kHz
♦
Master Clock (MCLK) up to 25MHz
♦
Automatic Detection of Clock Ratio (MCLK/
LRCLK)
MAX5556–MAX5559
Applications
Digital Video Recorders and Media Servers
Set-Top Boxes
Video-Game Hardware
Automotive Rear-Seat Entertainment
PART
Ordering Information
PIN-
PKG
DATA FORMAT
PACKAGE CODE
MAX5556ESA
8 SO
S8-5 Left-justified I
2
S data
MAX5557
ESA* 8 SO
S8-5 Left-justified data
MAX5558
ESA* 8 SO
S8-5 Right-justified 16-Bit data
MAX5559
ESA* 8 SO
S8-5 Right-justified 18-Bit data
Typical Operating Circuit
+5V
Note:
All devices are specified over the -40°C to +85°C oper-
ating temperature range. Contact factory for +105°C operation.
*Future
product—contact factory for availability.
Pin Configuration
V
DD
LEFT
OUTPUT
SDATA
AUDIO
DECOMPRESSION
SCLK
LRCLK
SERIAL
INTERFACE
DAC
OUTL
LINE-LEVEL
BUFFER
TOP VIEW
SDATA 1
SCLK 2
8
7
OUTL
V
DD
GND
OUTR
MAX5556–MAX5559
RIGHT
OUTPUT
LRCLK
3
MAX5556–
MAX5559
6
5
CLOCK
MCLK
DAC
OUTR
LINE-LEVEL
BUFFER
MCLK 4
GND
SO
________________________________________________________________
Maxim Integrated Products
1
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.
Low-Cost Stereo Audio DACs
MAX5556–MAX5559
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ...........................................................-0.3V to +6.0V
OUTL, OUTR, SDATA to GND................... -0.3V to (V
DD
+ 0.3V)
Current Into Any Pin (excluding V
DD
and GND)...............±10mA
OUTL, OUTR Shorted to GND....................................Continuous
SCLK, LRCLK, MCLK to GND ...............................-0.3V to +6.0V
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.88mW above +70°C)....................471mW
Package Thermal Resistance (θ
JA
) ...............................170°C/W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V
DD
= +4.75V to +5.5V, GND = 0V, R
OUT
_ = 10kΩ, C
OUT
_ = 10pF, 0dBFS sine-wave signal at 997Hz, f
LRCLK
(f
S
) = 48kHz, f
MCLK
=
12.288MHz, measurement bandwidth 10Hz to 20kHz, unless otherwise specified. T
A
= -40°C to +85°C, unless otherwise noted.
Outputs are unloaded, unless otherwise noted. Typical values at V
DD
= +5V, T
A
= +25°C.) (Note 1)
PARAMETER
POWER SUPPLY
Supply Voltage
Supply Current
Power Dissipation
DYNAMIC PERFORMANCE (Note 2)
Dynamic Range, 16-Bit
Dynamic Range, 18-Bit to 24-Bit
Total Harmonic Distortion Plus
Noise, 16-Bit
Unweighted
A-weighted
Unweighted
A-weighted
0dBFS
THD+N
-20dBFS
-60dBFS
0dBFS
Total Harmonic Distortion Plus
Noise, 18-Bit to 24-Bit
Interchannel Isolation
THD+N
-20dBFS
-60dBFS
1kHz full-scale output (crosstalk)
-0.5dB corner
Passband
-3dB corner
-6dB corner
Frequency Response/Passband
Ripple
Stopband
Stopband Attenuation
Group Delay
Passband Group-Delay Variation
t
gd
∆t
gd
20Hz to 20kHz
52
20 / f
S
±0.4 / f
S
10Hz to 20kHz (f
S
= 48kHz)
10Hz to 20kHz (f
S
= 44.1kHz)
10Hz to 16kHz (f
S
= 32kHz)
-0.025
-0.025
-6.000
0.46
0.49
0.50
+0.08
+0.08
+0.073
0.5465
f
S
dB
s
s
dB
f
S
COMBINED DIGITAL AND INTEGRATED ANALOG FILTER FREQUENCY RESPONSE (Note 3)
84
86
86
90
87
91
-86
-67
-26
-87
-68
-27
94
dB
dB
-24
-81
dB
dB
dB
V
DD
I
DD
Up to 48ksps
Static digital
Up to 48ksps
Static digital
4.75
5.0
13
6
65
30
5.50
15
8.5
82.5
44
V
mA
mW
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
________________________________________________________________________________________
Low-Cost Stereo Audio DACs
MAX5556–MAX5559
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +4.75V to +5.5V, GND = 0V, R
OUT
_ = 10kΩ, C
OUT
_ = 10pF, 0dBFS sine-wave signal at 997Hz, f
LRCLK
(f
S
) = 48kHz, f
MCLK
=
12.288MHz, measurement bandwidth 10Hz to 20kHz, unless otherwise specified. T
A
= -40°C to +85°C, unless otherwise noted.
Outputs are unloaded, unless otherwise noted. Typical values at V
DD
= +5V, T
A
= +25°C.) (Note 1)
PARAMETER
DC CHARACTERISTICS
Interchannel Gain Mismatch
Gain Error
Gain Drift
ANALOG OUTPUTS
Full-Scale Output Voltage
DC Quiescent Output Voltage
Minimum Load Resistance
Maximum Load Capacitance
Power-Supply Rejection Ratio
POP AND CLICK SUPPRESSION
Mute Attenuation
Power-Up Until Bias Established
Valid Clock to Normal Operation
Input-Voltage High
Input-Voltage Low
Input Leakage Current
Input Capacitance
TIMING CHARACTERISTICS
Input Sample Rate
MCLK Pulse-Width Low
f
S
MCLK/LRCLK = 512
t
MCLKL
MCLK/LRCLK = 384
MCLK/LRCLK = 256
MCLK/LRCLK = 512
MCLK Pulse-Width High
EXTERNAL SCLK MODE
LRCLK Duty Cycle
SCLK Pulse-Width Low
SCLK Pulse-Width High
SCLK Period
LRCLK Edge to SCLK Rising
LRCLK Edge to SCLK Rising
SDATA Valid to SCLK Rising
SCLK Rising to SDATA Hold Time
t
SCLKL
t
SCLKH
t
SCLK
t
SLRS
t
SLRH
t
SDS
t
SDH
(Note 6)
25
20
20
1 / (128
x f
S
)
20
20
20
20
75
%
ns
ns
ns
ns
ns
ns
ns
t
MCLKH
MCLK/LRCLK = 384
MCLK/LRCLK = 256
2
10
20
20
10
20
20
ns
ns
50
kHz
V
IH
V
IL
I
IN
-10
8
Figure 14
Soft-start ramp time, Figure 15 (Note 5)
2.0
0.8
+10
100
360
20
dB
ms
ms
V
V
µA
pF
V
OUTR
, V
OUTL
V
Q
R
L
C
L
PSRR
V
RIPPLE
= 100mV
P-P
, frequency = 1kHz
Input code = 0
3.25
3.5
2.4
3
100
66
3.75
V
P-P
V
kΩ
pF
dB
-5
100
0.1
0.4
+5
dB
%
ppm/°C
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DIGITAL AUDIO INTERFACE (SCLK, SDATA, MCLK, LRCLK)
_______________________________________________________________________________________
3
Low-Cost Stereo Audio DACs
MAX5556–MAX5559
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +4.75V to +5.5V, GND = 0V, R
OUT
_ = 10kΩ, C
OUT
_ = 10pF, 0dBFS sine-wave signal at 997Hz, f
LRCLK
(f
S
) = 48kHz, f
MCLK
=
12.288MHz, measurement bandwidth 10Hz to 20kHz, unless otherwise specified. T
A
= -40°C to +85°C, unless otherwise noted.
Outputs are unloaded, unless otherwise noted. Typical values at V
DD
= +5V, T
A
= +25°C.) (Note 1)
PARAMETER
INTERNAL SCLK MODE
LRCLK Duty Cycle
Internal SCLK Period
LRCLK Edge to Internal SCLK
SDATA Valid to Internal SCLK
SDATA Valid to Internal SCLK
t
ISCLK
t
ISCLKR
t
ISDS
t
ISDH
MCLK period = t
MCLK
MCLK period = t
MCLK
t
MCLK
+ 10
t
MCLK
(Note 7)
(Note 8)
1 / f
SCLK
t
ISCLK
/ 2
50
%
ns
ns
ns
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
100% production tested at T
A
= +85°C. Limits to -40°C are guaranteed by design.
Note 2:
0.5 LSB of triangular PDF dither added to data.
Note 3:
Guaranteed by design, not production tested.
Note 4:
PSRR test block diagram shown in Figure 1 denotes the test setup used to measure PSRR.
Note 5:
Volume ramping interval starts from establishment of a valid MCLK to LRCLK ratio. Total time is proportional to the sample
rate (f
S
). 20ms based on 48ksps operation.
Note 6:
In external SCLK mode, LRCLK duty cycles are not limited, provided all data formatting requirements are met. See Figures
4–7.
Note 7:
The LRCLK duty cycle must be 50% ±1/2 MCLK period in internal SCLK mode.
Note 8:
The SCLK/LRCLK ratio can be set to 32, 48, or 64, depending on the device and the MCLK/LRCLK ratio selected. See
Figures 4–7.
V
DD
ACTIVE CLOCKS
AUDIO SIGNAL
GENERATOR
(100mV
P-P
AT 1kHz)
Z
G
SCLK
LRCLK
MCLK
LOUT, ROUT
MAX5556–MAX5559
SPECTRUM
ANALYZER
SDATA
-
DC POWER SUPPLY
(5VDC)
+
GND
Figure 1. PSRR Test Block Diagram
4
________________________________________________________________________________________
Low-Cost Stereo Audio DACs
Typical Operating Characteristics
(V
DD
= +5V, GND = 0V, R
OUT_
= 10kΩ, C
OUT_
= 10pF, T
A
= +25°C, unless otherwise noted.)
STOPBAND REJECTION
MAX5556 toc01
MAX5556–MAX5559
TRANSITION BAND
MAX5556 toc02
TRANSITION BAND DETAIL
-1
-2
AMPLITUDE (dB)
-3
-4
-5
-6
-7
-8
-9
-10
MAX5556 toc03
0
-10
-20
AMPLITUDE (dB)
-30
-40
-50
-60
-70
-80
-90
-100
0
0
-10
-20
AMPLITUDE (dB)
-30
-40
-50
-60
-70
-80
-90
-100
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
FREQUENCY (NORMALIZED TO f
S
)
0.40
0.44
0.48
0.52
0.56
0.60
0.40
0.42
0.44
0.46
0.48
0.50
0.52
FREQUENCY (NORMALIZED TO f
S
)
FREQUENCY (NORMALIZED TO f
S
)
PASSBAND RIPPLE
0.20
0.15
AMPLITUDE (dB)
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
-0.25
0
0.1
0.2
0.3
0.4
0.5
FREQUENCY (NORMALIZED TO f
S
)
MAX5556 toc04
0dBFS FFT
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
0
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
0
2
MAX5556 toc05
-60dBFS FFT
MAX5556 toc06
0.25
AMPLITUDE (dBr)
AMPLITUDE (dBr)
16,000-SAMPLE FFT USING 1kHz INPUT
16,000-SAMPLE FFT USING 1kHz INPUT
2
4
6
8
10 12 14 16 18 20
4
6
8
10 12 14 16 18 20
FREQUENCY (kHz)
FREQUENCY (kHz)
IDLE-CHANNEL NOISE FFT
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
0
2
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
0
MAX5556 toc07
TWIN-TONE IMD FFT
MAX5556 toc08
THD+N vs. AMPLITUDE
MAX5556 toc09
-60
-70
THD+N (dBr)
UNWEIGHTED
AMPLITUDE (dBr)
AMPLITUDE (dBr)
16,000-SAMPLE FFT WITH NO INPUT
16,000-SAMPLE FFT
WITH 13kHz AND
14kHz INPUT SIGNALS
-80
-90
INPUT = 1kHz 18-BIT SIGNAL
-100
A-WEIGHTED
INTEGRATION BANDWIDTH = 20Hz TO 20kHz
-60
-50
-40
-30
-20
-10
0
-110
2
4
6
8
10 12 14 16 18 20
FREQUENCY (kHz)
4
6
8
10 12 14 16 18 20
FREQUENCY (kHz)
AMPLITUDE (dBFS)
_______________________________________________________________________________________
5
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