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PDF AK4550 Data sheet ( Hoja de datos )
| Número de pieza | AK4550 | |
| Descripción | Low Power & Small Package 16-bit CODEC | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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ASAHI KASEI
[AK4550]
AK4550
Low Power & Small Package 16bit ∆Σ CODEC
GENERAL DESCRIPTION
The AK4550 is a low voltage 16bit A/D & D/A converter for portable digital audio system. In the AK4550,
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 AK4550 are single-ended, therefore, any external filters are not required.
The AK4550 is suitable for portable digital audio system, as the AK4550 is lower power dissipation and a
smaller package than AK4518.
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 (AK4518 compatible)
- ADC: 16bit MSB justified
- DAC: 16bit 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: 2.3 to 3.6V
o Low Power Supply Current: 10mA
o Ta = -40 to 85°C
o Very Small Package: 16pin TSSOP
VDD VSS
AINL
AINR
∆Σ
Modulator
∆Σ
Modulator
VCOM
Common Voltage
Decimation
Filter
Decimation
Filter
Clock
Divider
Serial I/O
Interface
AOUTL
AOUTR
∆Σ 8X
LPF
Modulator
Interpolator
∆Σ 8X
LPF
Modulator
Interpolator
MCLK
LRCK
SCLK
SDTO
SDTI
DEM0
DEM1
PWDA
PWAD
M0068-E-01
-1-
2000/4
1 page  
ASAHI KASEI
[AK4550]
FILTER CHARACTERISTICS
(Ta=25°C; VDD=2.3 ∼ 3.6V; fs=44.1kHz; DEM0=”1”, DEM1=”0”)
Parameter
Symbol
min
typ
ADC Digital Filter (Decimation LPF):
Passband
(Note 7) ±0.1dB
-1.0dB
-3.0dB
PB
0
20.0
21.1
Stopband
SB 27.0
Passband Ripple
PR
Stopband Attenuation
SA 65
Group Delay
(Note 8)
GD
17.0
Group Delay Distortion
∆GD
ADC Digital Filter (HPF):
Frequency Response (Note 7) -3dB
FR
3.4
-0.5dB
10
-0.1dB
22
DAC Digital Filter:
Passband
(Note 7) ±0.1dB
-6.0dB
PB
0
22.05
Stopband
SB 24.1
Passband Ripple
PR
Stopband Attenuation
SA 43
Group Delay
(Note 8)
GD
14.8
DAC Digital Filter + Analog Filter
Frequency Response
0 ∼ 20.0kHz
FR
±0.5
max
17.4
±0.1
0
20.0
±0.06
Units
kHz
kHz
kHz
kHz
dB
dB
1/fs
us
Hz
Hz
Hz
kHz
kHz
kHz
dB
dB
1/fs
dB
Notes: 7. 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.
8. The calculating delay time which occurred by digital filtering. This time is from the input of analog signal to
setting the 16bit data of both channels to the output register for ADC. For DAC, this time is from setting the
16bit data of both channels on input register to the output of analog signal.
(Ta=25°C; VDD=2.3 ∼ 3.6V)
Parameter
High-Level Input Voltage
Low-Level Input Voltage
High-Level Output Voltage (Iout=-20uA)
Low-Level Output Voltage (Iout=20uA)
Input Leakage Current
DC CHARACTERISTICS
Symbol
VIH
VIL
VOH
VOL
Iin
min
70%VDD
-
VDD-0.1
-
-
typ
-
-
-
-
max
-
30%VDD
-
0.1
± 10
Units
V
V
V
V
uA
M0068-E-01
-5-
2000/4
5 Page 
ASAHI KASEI
[AK4550]
SYSTEM DESIGN
Figure 3 shows the system connection diagram. An evaluation board[AKD4550] is available which demonstrates
application circuit, optimum layout, power supply arrangements and measurement results.
Rch In
470
+
2.2n
Lch In
470
+
2.2n
Analog Supply
2.3 ∼ 3.6V
10u +
+
4.7u
0.1u
1 VCOM
AOUTR 16
2 AINR
AOUTL 15
3
4
0.1u
5
AINL
VSS
VDD
AK4550 PWDA 14
PWAD 13
Top View SCLK 12
6 DEM0
MCLK 11
7 DEM1
LRCK 10
8 SDTO
SDTI 9
Reset
Reset
Controller
Mode
Control
Analog Ground
System Ground
Figure 3. System Connection Diagram Example
Notes:
- LRCK=fs, 32fs ≤ SCLK ≤ 96fs, MCLK=256fs/384fs/512fs.
- When AOUT drives some capacitive load, some resistor should be added in series between AOUT and capacitive
load.
- Electrolytic capacitor value of VCOM depends on low frequency noise of supply voltage.
M0068-E-01
- 11 -
2000/4
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet AK4550.PDF ] | |
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