[AK5357]
AK5357
24Bit 96kHz
ΔΣ
ADC
GENERAL DESCRIPTION
The AK5357 is a stereo A/D Converter with wide sampling rate of 4kHz
∼
96kHz and is suitable for
multimedia audio system. The AK5357 achieves high accuracy and low cost by using Enhanced dual bit
ΔΣ
techniques. The AK5357 requires no external components because the analog inputs are
single-ended. The audio interface has two formats (MSB justified, I
2
S) and can correspond to many
systems like Karaoke, surround.
FEATURES
Stereo
ΔΣ
ADC
On-Chip Digital Anti-Alias Filtering
Single-ended Input
Digital HPF for DC-Offset cancel
S/(N+D): 88dB@5V, 86dB@3V for 48kHz
DR:
102dB@5V, 100dB@3V for 48kHz
S/N:
102dB@5V, 100dB@3V for 48kHz
Sampling Rate Ranging from 4kHz to 96kHz
Master Clock:
256fs/384fs/512fs/768fs (4kHz
∼
48kHz)
256fs/384fs
(48kHz
∼
96kHz)
Input level: TTL/CMOS selectable
Master / Slave Mode
Audio Interface: 24bit MSB justified / I
2
S selectable
Power Supply: 2.7
∼
5.5V
Ta =
−20 ∼
85°C (ET),
−40 ∼
85°C (VT),
−40 ∼
105°C (KT)
Small 16pin TSSOP Package
AK5381 Pin-compatible
VA AGND
VD DGND
MCLK
Clock Divider
AINL
ΔΣ
Modulator
ΔΣ
Modulator
Voltage Reference
Decimation
Filter
Decimation
Filter
Serial I/O
Interface
LRCK
SCLK
AINR
SDTO
VCOM
CKS2 CKS1 CKS0
PDN
DIF
MS0294-E-03
-1-
2009/03
[AK5357]
■
Ordering Guide
AK5357ET
AK5357VT
AK5357KT
AKD5357
−20 ∼
+85°C
16pin TSSOP (0.65mm pitch)
−40 ∼
+85°C
16pin TSSOP (0.65mm pitch)
−40 ∼
+105°C
16pin TSSOP (0.65mm pitch)
Evaluation Board for AK5357
■
Pin Layout
AINR
AINL
CKS1
VCOM
AGND
VA
VD
DGND
1
2
3
4
5
6
7
8
Top View
16
15
14
13
12
11
10
9
CKS0
CKS2
DIF
PDN
SCLK
MCLK
LRCK
SDTO
■
Compatibility with AK5353 and AK5381
S/(N+D)
DR
Master Mode
HPF OFF
TTL Level Mode
VIH@TTL Level Mode
VA (Analog Supply)
VD (Digital Supply)
Pin #3
Pin #15
Pin #16
AK5353
84dB
96dB
Not Available
Not Available
4kHz to 96kHz
2.2V
2.7 to 5.5V@fs=48kHz
4.5 to 5.5V@fs=96kHz
4.5 to 5.5V@fs=96kHz
VREF
TTL
TST
AK5381
96dB
106dB
Available
Available
4kHz to 48kHz
2.4V
4.5 to 5.5V@fs=48/96kHz
3.0 to 5.5V@fs=96kHz
CKS1
CKS2
CKS0
AK5357
88dB
102dB
Available
Available
4kHz to 96kHz
2.2V
2.7 to 5.5V@fs=48/96kHz
2.7 to 5.5V@fs=96kHz
CKS1
CKS2
CKS0
MS0294-E-03
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2009/03
[AK5357]
PIN / FUNCTION
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
AINR
AINL
CKS1
VCOM
AGND
VA
VD
DGND
SDTO
LRCK
MCLK
SCLK
PDN
DIF
CKS2
CKS0
I/O
I
I
I
O
-
-
-
-
O
I/O
I
I/O
I
I
I
I
Function
Rch Analog Input Pin
Lch Analog Input Pin
Mode Select 1 Pin
Common Voltage Output Pin, VA/2
Bias voltage of ADC input.
Analog Ground Pin
Analog Power Supply Pin, 2.7
∼
5.5V
Digital Power Supply Pin, 2.7
∼
5.5V
Digital Ground Pin
Audio Serial Data Output Pin
“L” Output at Power-down mode.
Output Channel Clock Pin
“L” Output in Master Mode at Power-down mode.
Master Clock Input Pin
Audio Serial Data Clock Pin
“L” Output in Master Mode at Power-down mode.
Power Down Mode Pin
“H”: Power up, “L”: Power down
Audio Interface Format Pin
“H” : 24bit I
2
S Compatible, “L” : 24bit MSB justified
Mode Select 2 Pin
Mode Select 0 Pin
Note: All digital input pins should not be left floating.
■
Handling of Unused Pin
The unused input pins should be processed appropriately as below.
Classification
Analog
Pin Name
AINL
AINR
Setting
This pin should be open.
This pin should be open.
MS0294-E-03
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2009/03
[AK5357]
ABSOLUTE MAXIMUM RATINGS
(AGND=DGND=0V;
Note 1)
Parameter
Analog
Power Supplies:
Digital
|AGND – DGND|
(Note
1)
Input Current, Any Pin Except Supplies
Analog Input Voltage (AINL, AINR, CKS1 pins)
Digital Input Voltage (All digital input pins except CKS1 pin)
AK5357ET
Ambient Temperature (powered applied)
AK5357VT
AK5357KT
Storage Temperature
Symbol
VA
VD
ΔGND
IIN
VINA
VIND
Ta
Ta
Ta
Tstg
min
−0.3
−0.3
-
-
−0.3
−0.3
−20
−40
−40
−65
max
6.0
6.0
0.3
±10
VA+0.3
VD+0.3
85
85
105
150
Units
V
V
V
mA
V
V
°C
°C
°C
°C
Note 1. All voltages with respect to ground.
Note 2. AGND and DGND must be connected to the same analog ground plane.
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
Power Supplies Analog
(Note
3)
Digital
Symbol
VA
VD
min
2.7
2.7
typ
5.0
5.0
max
5.5
VA
Units
V
V
Note 1. All voltages with respect to ground.
Note 3. The power up sequence between VA and VD is not critical.
WARNING: AKEMD assumes no responsibility for the usage beyond the conditions in this datasheet.
MS0294-E-03
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2009/03
[AK5357]
ANALOG CHARACTERISTICS
(Ta=25°C; VA=VD=5.0V; AGND=DGND=0V; fs=48kHz, 96kHz; SCLK=64fs; Signal Frequency=1kHz; 24bit Data;
Measurement frequency=20Hz
∼
20kHz at fs=48kHz, 40Hz
∼
40kHz at fs=96kHz; unless otherwise specified)
Parameter
min
typ
max
Units
ADC Analog Input Characteristics:
Resolution
24
Bits
AK5357ET
2.7
3.0
3.3
Vpp
Input Voltage (Note
4)
VA=5V fs=48kHz
AK5357VT
2.85
3.0
3.15
Vpp
fs=96kHz
2.7
3.0
3.3
VA=3V
-
1.8
-
Vpp
S/(N+D)
(−1dBFS) VA=5V fs=48kHz
78
88
dB
fs=96kHz
-
86
dB
VA=3V fs=48kHz
-
86
dB
fs=96kHz
-
84
dB
DR
(−60dBFS) VA=5V fs=48kHz, A-weighted
94
102
dB
fs=96kHz
88
97
dB
VA=3V fs=48kHz, A-weighted
-
100
dB
fs=96kHz
-
95
dB
VA=5V fs=48kHz, A-weighted
S/N
94
102
dB
fs=96kHz
88
97
dB
VA=3V fs=48kHz, A-weighted
-
100
dB
fs=96kHz
-
95
dB
Input Resistance
fs=48kHz
13
20
kΩ
fs=96kHz
9
14
kΩ
Interchannel Isolation
90
110
dB
Interchannel Gain Mismatch
0.1
0.5
dB
Gain Drift
100
-
ppm/°C
Power Supply Rejection
(Note
5)
-
50
dB
Power Supplies
Power Supply Current
Normal Operation (PDN pin = “H”)
mA
17
11
VA
mA
5
3
VD
(fs=48kHz)
(Note
6)
mA
9
6
VD
(fs=96kHz)
(Note
7)
Power down mode (PDN pin = “L”)
(Note
8)
μA
100
10
VA+VD
Note 4. This value is the full scale (0dB) of the input voltage. Input voltage is proportional to VA voltage.
Vin = 0.6 x VA (Vpp).
Note 5. PSR is applied to VA and VD with 1kHz, 50mVpp.
Note 6. VD=2mA@3V
Note 7. VD=4mA@3V
Note 8. All digital input pins are held VD or DGND.
MS0294-E-03
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2009/03
