AKD4382A-SB Datasheet, PDF (4/31 Pages) Asahi Kasei Microsystems – 192kHz sampling 24Bit ΔΣ DAC

[AKD4382A-SB]
SW1 setting
[SW1](PDN): Reset of AK4382A. Select “H” during operation.
 External Analog Filter Circuit
The 2nd order LPF (fc=93.2kHz, Q=0.712) which adds differential outputs of the AK4382A is implemented on the board.
When the further attenuation of the out-of-band noise is needed, some additional LPF is required. Analog signal is output
through BNC connectors on the board. And the output level of the AK4382A is 5.5Vpp@5V.
LOUT-
(ROUT-)
LOUT+
(ROUT+)
R1
C1
R1
R3
R3
R2
R2
C2
+15V
-
+
C2
10u
OP275
-15V
220
10k
Figure 4. On-board analog filter
R₁
R₂
R₃
C₁
C₂
4.7k
4.7k
200
3900p
470p
Table 4. The value of R, C on this board
fin
20kHz
40kHz
Frequency Response -0.003dB -0.122dB
Table 5. Frequency Response of LPF
80kHz
-1.821dB
<Calculation>
Amplitude = 20 log
K
[dB],
[1-(f/fc)²] ²+[(1/Q)(f/fc)] ²
K=
R₂
R₁
,
fc=
ω₀
2π
,
ω₀=
1
,
2C₁C₂R₂R₃
Q=
2C₁ω₀
.
1
R₁
+
1
R₂
+
1
R₃
<KM089400>
4
2007/06