AK4490EN Datasheet, PDF (61/68 Pages) Asahi Kasei Microsystems – Premium 32-Bit 2ch DAC

[AK4490EN]
10. Recommended External Circuits
Figure 38 shows the system connection diagram. Figure 40, Figure 41 and Figure 42 show the analog
output circuit examples. The evaluation board (AKD4490) demonstrates the optimum layout, power supply
arrangements and measurement results.
Digital Digital
1.8V 3.3V
Analog 3.3V
10u ^10u
10u
0.1u ^0.1u
0.1u
10u 10u
0.1u
Analog 5.0V
DSP
Micro-
Controller
1 NC
2 ^NC
3 PDN
4 BICK
5 SDATA
6 LRCK
7 WCK
8 CSN
9 CCLK
10 CDTI
11 ^DZFL
12 DZFR
AOUTLP 36
AOUTLN 35
VDDL 34 _{0.1u 10u}
VDDL 33
VSSL 32
VSSL 31
VSSR 30
N
0.1u 10u
VSSR 29
VDDR 28
VDDR 27
AOUTRN 26
AOUTRP ₂₅
Lch
Lch
LPF Mute
Lch Out
Rch Rch
LPF Mute
Rch Out
0.1u
10u 10u
Digital
Ground
Analog
Ground
Ceramic Capacitor
Figure 38. Typical Connection Diagram (AVDD=3.3V, VDDL/R=5V, DVDD=3.3V, Serial control mode)
(TVDD=1.8V, DVDD=3.3V, AVDD=3.3V, VDDL/R=5.0V and VREFHL/R=5.0V, Serial control mode)
Note 37.
(1) Chip Address = “00”. BICK = 64fs, LRCK = fs
(2) Power lines of AVDD and DVDD should be distributed separately from the point with low impedance
of regulator etc.
(3) AVSS, DVSS, VSSL, VSSR, VREFLL and VREFLR must be connected to the same analog ground
plane.
(4) When AOUT drives a capacitive load, some resistance should be connected in series between
AOUT and the capacitive load.
(5) All input pins except pull-down/pull-up pins should not be allowed to float.
(6) The exposed pad on the bottom surface of the package must be connected to the ground.
015013666-E-01
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2015/12