Datasheet

5–2
5.2 External Analog Back-End Circuit (f
s
= 44.1 kHz)
For specified performance, the output should be taken between VCOM and AOUTR (or AOUTL). At pins
AOUTR and AOUTL the output is an inverted analog representation of the digital input signal. It is advisable
to add a low-pass filter to the output of the TLC320AD77C to eliminate high frequency noise >80 kHz. See
Figure 5–2 for the recommended analog back-end circuit. The output of this circuit provides the user with
a noninverted signal.
_
+
C6
R9
10 k
AOUTR
VCOM
33 pF
R10
2
10 k
3
4
8
5 V
GND
10 k
R7
R8
10 k
C5
33 pF
3.3 VA_Ground
(AD77 AVSS @ U2–7)
0.7 V
rms
C20
47 µF
R11
100 k
3.3 VA_Ground
R12
221
Right Channel DAC
Output 0.7 V
rms
21
21
21
21
21
2
1
1
2
1
2
21
Figure 5–2. Analog Back End (right channel) for 0.7 Vrms Output