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PDF AK4519 Data sheet ( Hoja de datos )

Número de pieza AK4519
Descripción Low Power 20 bit ADC&DAC
Fabricantes Asahi Kasei Microsystems　
Logotipo Asahi Kasei Microsystems Logotipo



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No Preview Available ! AK4519 Hoja de datos, Descripción, Manual

ASAHI KASEI
[AK4519]
AK4519
Low Power 20 bit ∆Σ ADC&DAC with HPF
GENERAL DESCRIPTION
AK4519 is low voltage 20bit A/D & D/A converter for portable digital audio system. In the AK4519, 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 AK4519 are single-ended, therefore, external filter is not required.
The AK4519 is low power dissipation and be able to powered-down ADC and DAC independently, so the
AK4519 is suitable for portable digital audio system.
FEATURES
† HPF for DC-offset cancel (fc=3.4Hz)
† Single-ended ADC
- S/(N+D): 83dB
- Dynamic Range, S/N: 89dB at 2.5V, 90dB at 3V
† Single-ended DAC
- 2nd order SCF + 2nd order CTF
- Digital de-emphasis for 32kHz, 44.1kHz, 48kHz sampling
- S/(N+D): 83dB
- Dynamic Range, S/N: 92dB at 2.5V, 93dB at 3V
† Audio I/F format
- ADC:20bit MSB justified, DAC:20bit LSB justified,
MSB First, 2's Compliment
† High Jitter Tolerance
† Sampling Rate: 8kHz to 50kHz
† Master Clock: 256fs or 384fs or 512fs
† Power Supply: 2.4 to 4.0V
† Low Power Dissipation: 33.3mW at 2.5V, 41.1mW at 3V
† Small 24pin VSOP Package
M0015-E-01
-1-
1998/11

1 page




AK4519 pdf
ASAHI KASEI
[AK4519]
ANALOG CHARACTERISTICS
(Ta=25°C; VA,VB,VD,VRAD,VRDA=2.5V; fs=44.1kHz; Signal Frequency=1kHz;
Measurement frequency=10Hz∼20kHz; unless otherwise specified )
Parameter
min typ
ADC Analog Input Characteristics(Note 4 ): Analog Source Impedance=470Ω
Resolution
S/(N+D)
75 83
(Note 5 )
- 83
DR (-60dB Input, A-Weighted)
82 89
(Note 5 )
- 90
S/N (A-Weighted)
82 89
(Note 5 )
- 90
Interchannel Isolation
80 90
Interchannel Gain Mismatch
0.2
Input Voltage
(Note 6 )
1.35 1.5
Input Resistance
30 50
Power Supply Rejection
(Note 7 )
50
DAC Analog Output Characteristics: (Note 8 )
Resolution
S/(N+D)
75 83
(Note 5 )
- 83
DR (-60dB Output, A-Weighted)
86 92
(Note 5 )
- 93
S/N (A-Weighted)
86 92
(Note 5 )
- 93
Interchannel Isolation
90 100
Interchannel Gain Mismatch
0.2
Output Voltage
(Note 6 )
1.35 1.5
Load Resistance
10
Load Capacitance
Power Supply Rejection
(Note 7 )
50
Power Supplies
Power Supply Current
Analog: VA+VB
max
20
-
-
-
0.3
1.65
20
-
-
-
0.3
1.65
25
AD+DA
AD
DA
Power down (Note 9 )
Digital: VD
PWAD="H",PWDA="H"
PWAD="H",PWDA="L"
PWAD="L",PWDA="H"
PWAD="L",PWDA="L"
AD+DA
AD
DA
Power down (Note 9 )
PWAD="H",PWDA="H"
PWAD="H",PWDA="L"
PWAD="L",PWDA="H"
PWAD="L",PWDA="L"
Power consumption
10.5 15.8
4.8 7.2
6.5 9.8
20 100
2.8 4.2
1.8 2.7
1.4 2.1
10 50
AD+DA
AD
DA
Power down (Note 9 )
PWAD="H",PWDA="H"
PWAD="H",PWDA="L"
PWAD="L",PWDA="H"
PWAD="L",PWDA="L"
33.3 50.0
16.5 24.8
19.8 29.8
75 375
Units
Bits
dB
dB
dB
dB
dB
Vpp
kΩ
dB
Bits
dB
dB
dB
dB
dB
Vpp
kΩ
pF
dB
mA
mA
mA
uA
mA
mA
mA
uA
mW
mW
mW
uW
M0015-E-01
-5-
1998/11

5 Page





AK4519 arduino
ASAHI KASEI
[AK4519]
„ De-emphasis filter
The DAC of AK4519 includes the digital de-emphasis filter(tc=50/15us) by IIR filter. This filter corresponds to
three frequencies(32kHz, 44.1kHz, 48kHz). The de-emphasis filter selected by DEM0 and DEM1 is enabled for
input audio data. The de-emphasis is also disabled at DEM0="1" and DEM1="0".
DEM1 DEM0
Mode
0 0 44.1kHz
01
OFF
1 0 48kHz
1 1 32kHz
Table 2 . De-emphasis filter control
„ Digital High Pass Filter
The AK4519 has a Digital High Pass Filter(HPF) for DC-offset cancel. The cut-off frequency of the HPF is
3.4Hz at fs=44.1kHz and the frequency response at 20Hz is -0.12dB. It also scales with the sampling
frequency(fs).
M0015-E-01
- 11 -
1998/11

11 Page







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