AK4490EQ Datasheet, PDF (62/68 Pages) Asahi Kasei Microsystems – Premium 32-Bit 2ch DAC

[AK4490]
AK4490
AOUT-
AOUT+
1.5k
2.2n
1.5k
1.5k
1.5k
390
1n
+Vop
390
1n ^-Vop
Analog
Out
Figure 40. External LPF Circuit Example 1 for PCM (fc = 99.2kHz, Q=0.704)
Frequency Response
Gain
20kHz
0.011dB
40kHz
0.127dB
80kHz
1.571dB
Table 30. Frequency Response of External LPF Circuit Example 1 for PCM
100u
AOUTL- ⁺
330
3.3n
180
3.9n
37
2
+
-
*
4
6
NJM5534D
680
+ _10u
0.1u
+ ^10u
0.1u
100u
AOUTL+ ⁺
330
3.3n
180
3.9n
3
7
+
2-
6
4
NJM5534D
680
+ _10u
0.1u
+ ^10u
0.1u
+15
-15
560
0.1u +^10u
1.0n
620
620
2 _- 4 ₆ ¹⁰⁰
3+7
1.0n NJM5534D
Lch
g
0.1u
+ _10u
Figure 41. External LPF Circuit Example 2 for PCM
1^st Stage 2^nd Stage
Total
Cut-off Frequency
182kHz 284kHz
-
Q
0.637
-
-
Gain
+3.9dB -0.88dB +3.02dB
Frequency
Response
20kHz
40kHz
80kHz
-0.025
-0.106
-0.517
-0.021
-0.085
-0.331
-0.046dB
-0.191dB
-0.848dB
Table 31. Frequency Response of External LPF Circuit Example 2 for PCM
MS1648-E-03
- 62 -
2014/11