ASAHI KASEI
[AK4551]
MS0029-E-00
2000/5
-
1
-
GENERAL DESCRIPTION
The AK4551 is a low voltage 20bit A/D & D/A converter for portable digital audio system. In the AK4551,
the loss of accuracy form clock jitter is also improved by using SCF techniques for on-chip post filter.
Analog signal input/output of the AK4551 are single-ended, therefore, any external filters are not
required. The AK4551 is suitable for portable digital audio system, as the AK4551 is lower power
dissipation and a smaller package than AK4519.
FEATURES
o
HPF for DC-offset cancel (fc=3.4Hz)
o
Single-ended ADC
- S/(N+D): 82dB@VDD=2.5V
- Dynamic Range, S/N: 89dB@VDD=2.5V
o
Single-ended DAC
- Digital de-emphasis for 32kHz, 44.1kHz, 48kHz sampling
- S/(N+D): 85dB@VDD=2.5V
- Dynamic Range, S/N: 92dB@VDD=2.5V
o
Audio I/F format: MSB First, 2's Compliment (AK4519 compatible)
- ADC: 20bit MSB justified
- DAC: 20bit LSB justified
o
Input/Output Voltage: 0.6 X VDD (=1.5Vpp@VDD=2.5V)
o
High Jitter Tolerance
o
Sampling Rate: 8kHz to 50kHz
o
Master Clock: 256fs or 384fs or 512fs
o
Power Supply: 2.2 to 3.6V
o
Low Power Supply Current: 10mA
o
Ta = -20 to 85C
o
Very Small Package: 16pin TSSOP
Modulator
MCLK
VDD
VSS
AOUTL
AINL
LRCK
SCLK
VCOM
AINR
Modulator
Decimation
Filter
Serial I/O
Interface
Common Voltage
SDTO
Decimation
Filter
SDTI
PWDA
DEM0
PWAD
Clock
Divider
AOUTR
8X
Interpolator
8X
Interpolator
Modulator
Modulator
LPF
LPF
DEM1
Low Power & Small Package 20bit
CODEC
AK4551
ASAHI KASEI
[AK4551]
MS0029-E-00
2000/5
-
2
-
n
Ordering Guide
AK4551VT -20
+85
C 16pin
TSSOP
(0.65mm
pitch)
AKD4551
Evaluation
Board
for
AK4551
n
Pin Layout
1
VCOM
AINR
VSS
AINL
VDD
DEM0
DEM1
SDTO
Top
View
2
3
4
5
6
7
8
AOUTR
AOUTL
PWAD
SCLK
MCLK
LRCK
SDTI
16
15
14
13
12
11
10
9
PWDA
PIN/FUNCTION
No. Pin
Name
I/O Function
1
VCOM
O
Common Voltage Output Pin, 0.45 x VDD
2
AINR
I
Rch Analog Input Pin
3
AINL
I
Lch Analog Input Pin
4 VSS
- Ground
Pin
5
VDD
-
Power Supply Pin
6
DEM0
I
De-emphasis Control Pin
7
DEM1
I
De-emphasis Control Pin
8
SDTO
O
Audio Serial Data Output Pin
9
SDTI
I
Audio Serial Data Input Pin
10
LRCK
I
Input/Output Channel Clock Pin
11
MCLK
I
Master Clock Input Pin
12
SCLK
I
Audio Serial Data Clock Pin
13 PWAD I
ADC Power-Down & Reset Mode Pin
"L": Power down. ADC should always be reset upon power-up.
14 PWDA I
DAC Power-Down & Reset Mode Pin
"L": Power down. DAC should always be reset upon power-up.
15
AOUTL
O
Lch Analog Output Pin
16
AOUTR
O
Rch Analog Output Pin
ASAHI KASEI
[AK4551]
MS0029-E-00
2000/5
-
3
-
ABSOLUTE MAXIMUM RATINGS
(VSS=0V;
Note 1
)
Parameter Symbol
min
max
Units
Power Supply
VDD
-0.3
4.6
V
Input Current (Any Pin Except Supplies)
IIN
-
10
mA
Input Voltage
VIN
-0.3
VDD+0.3
V
Ambient Temperature (power applied)
Ta
-20
85
C
Storage Temperature
Tstg
-65
150
C
Note 1. All voltages with respect to ground.
WARNING: Operation at or beyond these limits may results in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
RECOMMENDED OPERATING CONDITIONS
(VSS=0V;
Note 1
)
Parameter Symbol
min
typ
max
Units
Power Supply
VDD
2.2
2.5
3.6
V
Note 1
. All voltages with respect to ground.
*AKM assumes no responsibility for the usage beyond the conditions in this data sheet.
ASAHI KASEI
[AK4551]
MS0029-E-00
2000/5
-
4
-
ANALOG CHARACTERISTICS
(Ta=25
C; VDD=2.5V; fs=44.1kHz; Signal Frequency=1kHz; SCLK=64fs; Measurement frequency=10Hz
20kHz;
unless otherwise specified)
Parameter min
typ
max
Units
ADC Analog Input Characteristics: Analog Source Impedance=470
(
Note 2
)
Resolution
20
Bits
S/(N+D) (-0.5dB Input)
72
82
dB
D-Range (-60dB Input, A-weighted)
82
89
dB
S/N (A-weighted)
82
89
dB
Interchannel Isolation
80
95
dB
Interchannel Gain Mismatch
0.2
0.5
dB
Input Voltage (
Note 3
) 1.35
1.50
1.65
Vpp
Input Resistance
50
100
k
Power Supply Rejection (
Note 4
)
35
dB
DAC Analog Output Characteristics:
Resolution
20
Bits
S/(N+D) 75
85
dB
D-Range (-60dB Output, A-weighted)
86
92
dB
S/N (A-weighted)
86
92
dB
Interchannel Isolation
80
95
dB
Interchannel Gain Mismatch
0.2
0.5
dB
Output Voltage (
Note 3
) 1.35
1.50
1.65
Vpp
Load Resistance
10
k
Load Capacitance
30
pF
Power Supply Rejection (
Note 4
)
50
dB
Power Supplies
Power Supply Current
AD+DA
AD
DA
Power down (
Note 5
)
PWAD = "H", PWDA =
"H" PWAD = "H", PWDA =
"L" PWAD = "L", PWDA = "H"
PWAD = "L", PWDA = "L"
10
5.6
5.6
10
15
8.4
8.4
50
mA
mA
mA
uA
Power Consumption
AD+DA
AD
DA
Power down (
Note 5
)
PWAD = "H", PWDA = "H"
PWAD = "H", PWDA = "L"
PWAD = "L", PWDA = "H"
PWAD = "L", PWDA = "L"
25
14
14
25
37.5
21
21
125
mW
mW
mW
uW
Note 2. The offset of ADC is removed by internal HPF.
Note 3. Input /Output of ADC and DAC scales with VDD voltage. 0.6 X VDD (typ).
Note 4. PSR is applied to VDD with 1kHz, 50mV.
Note 5. In case of power-down mode, all digital input including clocks pins (MCLK, SCLK and LRCK) are held VDD or
VSS. But PWAD and PWDA pins are held VSS.
ASAHI KASEI
[AK4551]
MS0029-E-00
2000/5
-
5
-
FILTER CHARACTERISTICS
(Ta=25
C; VDD=2.2
3.6V; fs=44.1kHz; DEM0="1", DEM1="0")
Parameter Symbol
min
typ
max
Units
ADC Digital Filter (Decimation LPF):
Passband (
Note 6
)
0.1dB
-1.0dB
-3.0dB
PB 0
20.0
21.1
17.4 kHz
kHz
kHz
Stopband SB
27.0
kHz
Passband Ripple
PR
0.1
dB
Stopband Attenuation
SA
65
dB
Group Delay (
Note 7
) GD
17.0
1/fs
Group Delay Distortion
GD
0 us
ADC Digital Filter (HPF):
Frequency Response (
Note 6
) -3dB
-0.5dB
-0.1dB
FR 3.4
10
22
Hz
Hz
Hz
DAC Digital Filter:
Passband (
Note 6
)
0.1dB
-6.0dB
PB 0
22.05
20.0 kHz
kHz
Stopband SB
24.1
kHz
Passband Ripple
PR
0.06
dB
Stopband Attenuation
SA
43
dB
Group Delay (
Note 7
) GD
15.4
1/fs
Group Delay Distortion
GD
0 us
DAC Digital Filter + Analog Filter
Frequency Response 0
20.0kHz
FR
0.5
dB
Note 6. The passband and stopband frequencies scale with fs (sampling frequency).
For examples, PB=20.0kHz(@ADC: -1.0dB, DAC: -0.1dB) are 0.454 x fs.
Note 7. The calculating delay time which occurred by digital filtering. This time is from the input of analog signal to setting
the 20bit data of both channels to the output register for ADC. For DAC, this time is from setting the 20bit data of
both channels on input register to the output of analog signal.
DC CHARACTERISTICS
(Ta=25
C; VDD=2.2
3.6V)
Parameter Symbol
min
typ
max
Units
High-Level Input Voltage
Low-Level Input Voltage
VIH
VIL
70
%
VDD
-
-
-
-
30
%
VDD
V
V
High-Level Output Voltage (Iout=-20uA)
Low-Level Output Voltage (Iout=20uA)
VOH
VOL
VDD-0.1
-
- -
0.1
V
V
Input Leakage Current
Iin
-
-
10
uA
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