ASAHI KASEI
[AK4314]
AK4314
Low Power 16Bit
∆Σ
DAC with Digital DBB
General Description
The AK4314 is a low power 1bit stereo DAC with Digital DBB(Dynamic Bass Boost) for multimedia audio
system and also includes 16bit digital filter and analog LPF. A 1bit DAC can achieve monotonicity and low
distortion with no adjustment and is superior to traditional R-2R ladder based DACs. In the AK4314, the loss
of accuracy from clock jitter is also improved by using SCF techniques for on-chip post filter. The AK4314
includes continuous time filter with single end output and does not need any external parts. The AK4314 also
has digital attenuator with 0.75dB step and is suitable for the portable audio systems like MD, etc.
Features
Sampling Rate Ranging from 30kHz to 50kHz
On chip Perfect filtering 8 times FIR Interpolator, SCF & CTF
On chip Buffer with Single End Output
Digital de-emphasis for 44.1kHz sampling
(In serial mode control, De-emphasis of 32, 44.1, 48kHz sampling
can be enable.)
On chip Digital DBB(Dynamic Bass Boost)
On chip digital LOG attenuator
Soft Mute
Master Clock: 384fs
High Tolerance to Clock Jitter
Dynamic Range: 92dB
Low Voltage Operation: 2.7V∼3.6V
Low Power Dissipation: 24mW(@3V)
0089-E-01
-1-
1996/05
ASAHI KASEI
Ordering Guide
AK4314-VF
AKD4314
-10∼+70°C
Evaluation Board
24pin VSOP(0.65mm pitch)
[AK4314]
Pin Layout
0089-E-01
-2-
1996/05
ASAHI KASEI
[AK4314]
PIN/FUNCTION
No.
1
2
3
Pin Name
DVDD
DVSS
PD
I/O
-
-
I
Digital Power Supply Pin
Digital Ground Pin
Function
Power-Down Pin
When at "L", the AK4314 is in power-down mode and is held in
reset. The AK4314 should always be reset upon power-up.
Crystal Oscillator Output Pin
When an external clock is input, this pin should be left
floating.
Master Clock Input Pin
A crystal can be connected between this pin and XTO, or
an external CMOS clock can be input on XTI.
Clock Buffer Output Pin
An inverting clock of XTI is output from this pin.
Serial Bit Input Clock Pin
This clock is used to latch audio data.
Audio Data Input Pin
2's complement MSB-first data is input on this pin.
L/R Clock Pin
This input determines which audio channel is currently being
input on SDATA pin. "H": Lch, "L": Rch
Control Data Input Pin
Control Clock Input Pin
Chip Select Pin
4
XTO
O
5
XTI
I
6
7
8
9
CLKO
BICK
SDATA
LRCK
O
I
I
I
10
11
12
10
11
12
13
14
15
16
17
18
CDATA
CCLK
CS
(NC)
(DBB0)
(DBB1)
SMUTE
DEM
P/S
AOUTR
AOUTL
VCOMR
I
I
I
I
I
I
O
I
I
O
O
O
(Serial mode control)
Must be left floating or tied to AVSS.
(Pull-down pin)
DBB0 and DBB1 pins select one of the four kind modes for
Digital DBB
(Parallel mode control)
Soft Mute Pin
When this pin goes "H", soft mute cycle is initiated.
De-emphasis Enable Pin
When "H", De-emphasis of fs=44.1kHz is enabled.
Parallel/Serial Mode Select Pin
"H": Parallel mode, "L": Serial mode
Rch Analog Output Pin
Lch Analog Output Pin
Rch Common Voltage pin, AVDD/2
Normally connected to AVSS with a 0.1uF ceramic capacitor in
parallel with a 10uF electrolytic cap.
Lch Common Voltage pin, AVDD/2
Normally connected to AVSS with a 0.1uF ceramic capacitor in
parallel with a 10uF electrolytic cap.
Analog Power Supply Pin
Analog Ground Pin
Voltage Reference Input Pin
The differential Voltage between this pin and AVSS sets the
analog output range. Normally connected to AVSS with a
0.1uF ceramic capacitor.
1996/05
-3-
19
VCOML
O
20
21
22
AVDD
AVSS
VREF
-
-
I
0089-E-01
ASAHI KASEI
23
DZF
O
Zero Input Detect Pin
When SDATA of both channels follow a total 8192 LRCK cycles
with "0" input data, this pin goes "H".
Test Pin
(Pull-down pin)
Must be left floating or tied to AVSS.
[AK4314]
24
TST1
I
0089-E-01
-4-
1996/05
ASAHI KASEI
[AK4314]
ABSOLUTE MAXIMUM RATINGS
(AVSS,DVSS=0V; Note 1 )
Parameter
Power Supplies:
Analog (AVDD pin)
Digital (DVDD pin)
Symbol
AVDD
DVDD
IIN
VIND
Ta
Tstg
min
-0.3
-0.3
-
-0.3
-10
-65
max
6.0
AVDD+0.3
±10
AVDD+0.3
70
150
Units
V
V
mA
V
°C
°C
Input Current, Any Pin Except Supplies
Input Voltage
Ambient Operating Temperature
Storage Temperature
Note: 1 . All voltages with respect to ground.
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
(AVSS,DVSS=0V; Note 1 )
Parameter
Power Supplies: Analog (AVDD pin)
Digital (DVDD pin)
Voltage Reference
(Note 2 )
Symbol
AVDD
DVDD
VREF
min
2.7
2.7
2.3
typ
3.0
3.0
-
max
3.6
AVDD
AVDD
Units
V
V
V
Notes: 1. All voltages with respect to ground.
2. Analog output voltage scales with the voltage of VREF.
AOUT(typ.@0dB)=1.58Vpp∗VREF/3
∗
AKM assumes no responsibility for the usage beyond the conditions in this data sheet.
0089-E-01
-5-
1996/05
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