ASAHI KASEI
[AK4523]
M0021-E-03
1999/12
- 1 -
GENERAL DESCRIPTION
The AK4523 has a dynamic range of 100dB and is well-suited middle-range MD, surround system,
musical instruments and car audio. Signal inputs and outputs are single-ended. The DAC outputs are
analog filtered to remove out of band noise. External components are minimized.
FEATURES
o
DS
Stereo ADC
- 64x Oversampling
- Sample Rate Ranging from 16kHz to 48kHz
- S/(N+D): 92dB
- Dynamic range, S/N: 100dB
- Digital HPF for offset cancellation
o
DS
Stereo DAC
- 128x Oversampling
- Sampling Rate Ranging from 16kHz to 48kHz
- 2nd order SCF + 2nd order CTF
- Digital de-emphasis for 32kHz, 44.1kHz, 48kHz sampling
- S/(N+D): 90dB
- Dynamic Range, S/N: 100dB
- Soft Mute
o
High Jitter Tolerance
o
Master Clock: 256fs, 384fs, 512fs
o
Analog Power Supply: 4.5 to 5.5V, Digital Power Supply: 3.0 to 5.5V
VA
AGND
VD DGND
CMODE
AINL+
AINL-
AINR+
AINR-
VREFH
VCOM
AOUTL
AOUTR
MCKI
LRCK
SCLK
SDTO
SDTI
DIF0
DIF1
SMUTE
DEM1
DEM0
PD
Modulator
DS
Modulator
DS
Filter
Decimation
Filter
Decimation
HPF
HPF
Common Voltage
LPF
LPF
Modulator
DS
Modulator
DS
Interpolator
8x
Interpolator
8x
Serial I/O
Interface
Clock
Divider
20Bit Stereo
DS
ADC & DAC
AK4523
ASAHI KASEI
[AK4523]
M0021-E-03
1999/12
- 2 -
n
Ordering Guide
AK4523VF
-40
~ +85C
28pin VSOP (0.65mm pitch)
AKD4523
Evaluation Board for AK4523
n
Pin Layout
AGND
VREFH
AINR+
AINR-
AINL+
AINL-
VA
NC
NC
DIF0
DIF1
LRCK
SCLK
SDTI
SDTO
SMUTE
DEM0
DEM1
NC
VD
DGND
PD
CMODE
AOUTL
AOUTR
VCOM
MCKI
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
AK4523
Top
View
n
Difference between AK4523 and AK4522
AK4523
AK4522
Digital Power Supply
3.0
~5.5V
2.7
~5.5V
Ambient Operating
-40
~85C
-10
~70C
Package
28pin VSOP
24pin VSOP
ASAHI KASEI
[AK4523]
M0021-E-03
1999/12
- 3 -
PIN/FUNCTION
No.
Pin Name
I/O
Function
1
VREFH
I
Positive Voltage Reference Input Pin, VA
Used as a positive voltage reference by ADC & DAC. VREFH should be connected
externally to filtered VA.
2
AINR+
I
Rch Analog Positive Input Pin
3
AINR-
I
Rch Analog Negative Input Pin
4
AINL+
I
Lch Analog Positive Input Pin
5
AINL-
I
Lch Analog Negative Input Pin
6
VA
-
Analog Power Supply Pin
7
AGND
-
Analog Ground Pin
8
NC
-
No connect
No internal bonding.
9
NC
-
No connect
No internal bonding.
10
DIF0
I
Audio Data Interface Format 0 Pin
11
DIF1
I
Audio Data Interface Format 1 Pin
12
LRCK
I
Input Channel Clock Pin
13
SCLK
I
Audio Serial Data Clock Pin
14
SDTI
I
Audio Serial Data Input Pin
15
SDTO
O
Audio Serial Data Output Pin
16
SMUTE
I
Soft Mute Pin
When this pin goes "H", soft mute cycle is initiated.
When returning "L", the output mute releases.
17
DEM0
I
De-emphasis Frequency Select 0 Pin
18
DEM1
I
De-emphasis Frequency Select 1 Pin
19
MCKI
I
Master Clock Input Pin
20
NC
-
No connect
No internal bonding.
21
NC
-
No connect
No internal bonding.
22
VD
-
Digital Power Supply Pin
23
DGND
-
Digital Ground Pin
24
PD
I
Power-Down Mode Pin
25
CMODE
I
Master Clock Select Pin (Internal biased pin)
"H": 384fs, "L": 256fs, "NC": 512fs
26
AOUTL
O
Lch Analog Output Pin
27
AOUTR
O
Rch Analog Output Pin
28
VCOM
O
Common Voltage Output Pin, VA/2
Note: All input pins except for CMODE pin should not be left floating.
ASAHI KASEI
[AK4523]
M0021-E-03
1999/12
- 4 -
ABSOLUTE MAXIMUM RATINGS
(AGND, DGND=0V; Note 1)
Parameter
Symbol
min
max
Units
Power Supplies
Analog
Digital
|AGND-DGND| (Note 2)
VA
VD
DGND
-0.3
-0.3
-
6.0
6.0
0.3
V
V
V
Input Current, Any Pin Except Supplies
IIN
-
10
mA
Analog Input Voltage
VINA
-0.3
VA+0.3
V
Digital Input Voltage
VIND
-0.3
VD+0.3
V
Ambient Temperature (power applied)
Ta
-40
85
C
Storage Temperature
Tstg
-65
150
C
Note:1. All voltages with respect to ground.
2. AGND and DGND must be same voltage.
WARNING: Operation at or beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
RECOMMENDED OPERATING CONDITIONS
(AGND, DGND=0V; Note 1)
Parameter
Symbol
min
typ
max
Units
Power Supplies
(Note 3)
Analog
Digital
VA
VD
4.5
3.0
5.0
5.0
5.5
VA
V
V
Voltage Reference
VREFH
90%VA
VA
V
Note:1. All voltages with respect to ground.
3. The power up sequence between VA and VD is not critical.
*AKM assumes no responsibility for the usage beyond the conditions in this datasheet.
ASAHI KASEI
[AK4523]
M0021-E-03
1999/12
- 5 -
ANALOG CHARACTERISTICS
(Ta=25
C; VA, VD=5V; AGND=DGND=0V; VREFH=VA; fs=44.1kHz; SCLK=64fs;
Signal Frequency =1kHz; 20bit Data; Measurement Frequency=10Hz
~ 20kHz; unless otherwise specified)
Parameter
min
typ
max
Units
ADC Analog Input Characteristics: Differential Inputs; Analog Source Impedance=470
W
Resolution
20
Bits
S/(N+D) (-0.5dB Input) (Note 4)
84
92
dB
DR (-60dB Input, A-Weighted) (Note 5)
94
100
dB
S/N (A-Weighted) (Note 5, 6)
94
100
dB
Interchannel Isolation
90
110
dB
Interchannel Gain Mismatch
0.1
0.3
dB
Gain Drift
20
ppm/
C
Input Voltage (AIN=0.6 x VREFH) (Note 7)
2.85
3.0
3.15
Vpp
Input Resistance
15
25
k
W
Power Supply Rejection (Note 8)
50
dB
DAC Analog Output Characteristics:
Resolution
20
Bits
S/(N+D)
80
90
dB
DR (-60dB Output, A-Weighted) (Note 5)
94
100
dB
S/N (A-Weighted) (Note 6, 9)
94
100
dB
Interchannel Isolation
90
110
dB
Interchannel Gain Mismatch
0.2
0.5
dB
Gain Drift
20
ppm/
C
Output Voltage (AOUT=0.58 x VREFH)
2.65
2.9
3.15
Vpp
Load Resistance
5
k
W
Load Capacitance
25
pF
Power Supply Rejection (Note 8)
50
dB
Power Supplies
Power Supply Current (VA=VD=5V)
Analog, VA PD = "H"
42
55
mA
Digital, VD PD = "H"
10
20
mA
Power Down PD = "L" (Note 10)
0.4
2
mA
Note: 4. In case of single ended input, S/(N+D)=80dB(typ, @VA=5V).
5. In case of 16bit, DR and S/N of ADC are 98dB. DR of DAC is 98dB.
6. S/N measured by CCIR-ARM is 96dB at each converter and 94dB at ADC to DAC loopback.
7. Full scale input for each AIN+/- pin is 1.5Vpp in differential mode.
8. PSR is applied to VA, VD with 1kHz, 50mVpp. VREFH pin is held a constant voltage.
9. As the input data is "0", S/N is 100dB regardless of resolution.
10. All digital input pins are held VD or DGND.
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