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AK4394 Schematic ( PDF Datasheet ) - Asahi Kasei Microsystems

Teilenummer AK4394
Beschreibung ADVANCED MULTI-BIT 192KHZ 24-BIT DAC
Hersteller Asahi Kasei Microsystems
Logo Asahi Kasei Microsystems Logo 




Gesamt 26 Seiten
AK4394 Datasheet, Funktion
ASAHI KASEI
[AK4394]
AK4394
Advanced Multi-Bit 192kHz 24-Bit DS DAC
GENERAL DESCRIPTION
The AK4394 is a high performance stereo DAC for the 192kHz sampling mode of DVD-Audio including a
24bit digital filter. The AK4394 introduces the advanced multi-bit system for DS modulator. This new
architecture achieves the wider dynamic range, while keeping much the same superior distortion
characteristics as conventional Single-Bit way. In the AK4394, the analog outputs are filtered in the
analog domain by switched-capacitor filter(SCF) with high tolerance to clock jitter. The analog outputs
are full differential output, so the device is suitable for hi-end applications. The digital I/F can correspond
to TTL levels, so it is easy to I/F with 3.3V logic IC.
FEATURES
· 128x Oversampling
· Sampling Rate up to 192kHz
· 24Bit 8x Digital Filter (Slow-roll-off option)
Ripple: ±0.005dB, Attenuation: 75dB
· High Tolerance to Clock Jitter
· Low Distortion Differential Output
· Digital de-emphasis for 32, 44.1, 48 & 96kHz sampling
· Soft Mute
· THD+N: -100dB
· DR, S/N: 120dB
· I/F format :
MSB justified, 16/20/24bit LSB justified, I2S
· Master Clock: Normal Speed: 256fs, 384fs, 512fs or 768fs
Double Speed: 128fs, 192fs, 256fs or 384fs
Quad Speed: 128fs or 192fs
· Power Supply: 5V±5%
· TTL Level Digital I/F
· Small Package: 28pin VSOP
· Pin Compatible with AK4393
DIF0 DIF1 DIF2 DVDD DVSS
DEM0 DEM1 AVDD AVSS
LRCK
BICK
SDATA
PDN
SMUTE
DFS0
Audio Data
Interface
De-emphasis
Control
De-emphasis
Soft Mute
De-emphasis
Soft Mute
8x
Interpolator
DS
Modulator
8x
Interpolator
DS
Modulator
SCF
SCF
Control Register
Clock Divider
BVSS
VCOM
DZFL
AOUTL+
AOUTL-
AOUTR+
AOUTR-
DZFR
CSN CCLK CDTI P/S MCLK CKS0 CKS1 CKS2 VREFH VREFL
M0081-E-00
-1-
1999/11






AK4394 Datasheet, Funktion
ASAHI KASEI
[AK4394]
SHARP ROLL-OFF FILTER CHARACTERISTICS (fs = 44.1kHz)
(Ta = 25°C; AVDD, DVDD = 4.75~5.25V; fs = 44.1kHz; Normal Speed Mode; DEM = OFF; SLOW = “0”)
Parameter
Symbol
min
typ
max Units
Digital Filter
Passband
±0.01dB (Note 14)
-6.0dB
PB
0 20.0 kHz
- 22.05 - kHz
Stopband
(Note 14)
SB
24.1
Passband Ripple
PR
Stopband Attenuation
SA 75
Group Delay
(Note 15)
GD
-
kHz
± 0.005
dB
dB
28 - 1/fs
Digital Filter + SCF
Frequency Response 0 ~ 20.0kHz
- ± 0.2 - dB
Note: 14. The passband and stopband frequencies scale with fs.
For example, PB = 0.4535×fs (@±0.01dB), SB = 0.546×fs.
15. The calculating delay time which occurred by digital filtering. This time is from setting the 16/20/24bit data of
both channels to input register to the output of analog signal.
SHARP ROLL-OFF FILTER CHARACTERISTICS (fs = 96kHz)
(Ta = 25°C; AVDD, DVDD = 4.75~5.25V; fs = 96kHz; Double Speed Mode; DEM = OFF; SLOW = “0”)
Parameter
Symbol
min
typ
max
Digital Filter
Passband
±0.01dB (Note 14)
PB
0
43.5
-6.0dB
- 48.0 -
Stopband
(Note 14)
SB
52.5
Passband Ripple
PR
± 0.005
Stopband Attenuation
SA 75
Group Delay
(Note 15)
GD
-
28
-
Digital Filter + SCF
Frequency Response 0 ~ 40.0kHz
- ± 0.3 -
Units
kHz
kHz
kHz
dB
dB
1/fs
dB
SHARP ROLL-OFF FILTER CHARACTERISTICS (fs = 192kHz)
(Ta = 25°C; AVDD, DVDD = 4.75~5.25V; fs = 192kHz; Quad Speed Mode; DEM = OFF; SLOW = “0”)
Parameter
symbol
min
typ
max
Digital Filter
Passband
±0.01dB (Note 14)
-6.0dB
PB
0 87.0
- 96.0 -
Stopband
(Note 14)
SB
105
Passband Ripple
Stopband Attenuation
Group Delay
(Note 15)
PR
SA
GD
75
-
± 0.005
28 -
Digital Filter + SCF
Frequency Response 0 ~ 80.0kHz
- +0/-1 -
Units
kHz
kHz
kHz
dB
dB
1/fs
dB
M0081-E-00
-6-
1999/11

6 Page









AK4394 pdf, datenblatt
ASAHI KASEI
[AK4394]
LRCK
fs
88.2kHz
96.0kHz
128fs
11.2896MHz
12.2880MHz
MCLK
192fs
256fs
16.9344MHz 22.5792MHz
18.4320MHz 24.5760MHz
384fs
33.8688MHz
36.8640MHz
BICK
64fs
5.6448MHz
6.1440MHz
Table 4. System clock example (Double Speed Mode)
LRCK
fs
176.4kHz
192.0kHz
MCLK
128fs
192fs
22.5792MHz 33.8688MHz
24.5760MHz 36.8640MHz
BICK
64fs
11.2896MHz
12.2880MHz
Table 5. System clock example (Quad Speed Mode)
n Audio Serial Interface Format
Data is shifted in via the SDATA pin using BICK and LRCK inputs. Five data formats are supported and selected by the
DIF0-2 as shown in Table 6. In all formats the serial data is MSB-first, 2's compliment format and is latched on the rising
edge of BICK. Mode 2 can be used for 20 and 16 MSB justified formats by zeroing the unused LSBs.
Mode
0
1
2
3
4
DIF2
0
0
0
0
1
DIF1
0
0
1
1
0
DIF0
0
1
0
1
0
Mode
0: 16bit LSB Justified
1: 20bit LSB Justified
2: 24bit MSB Justified
3: I2S Compatible
4: 24bit LSB Justified
BICK
³32fs
³40fs
³48fs
³48fs
³48fs
Figure
Figure 1
Figure 2
Figure 3
Figure 4
Figure 2
Table 6. Audio Data Formats
LRCK
BICK
(32fs)
SDATA
Mode 0
BICK
(64fs)
SDATA
Mode 0
01
10 11 12 13 14 15 0 1
15 14
01
6 5 4 3 2 1 0 15 14
14 15 16 17
31 0 1
Don’t care
15 14
15:MSB, 0:LSB
Lch Data
0 Don’t care
10 11 12 13 14 15 0 1
6 5 4 3 2 1 0 15 14
14 15 16 17
31 0 1
15 14
0
Rch Data
Figure 1. Mode 0 Timing
M0081-E-00
- 12 -
1999/11

12 Page





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