DSB75 Development Support Board Rev. B1 Hardware Description
Confidential / Released
DSB75_hd_v12
Page 36 of 96
2008-08-26
3.6
Analog Audio Interfaces
The DSB75 comprises two analog audio interfaces. Both audio interfaces are providing a
supply circuit to feed an active microphone.
Figure 14 shows the simplified interface schematic.
Figure 15 shows the location of switches and the pin assignment of the audio connectors.
Electrical characteristics are specified in section 8.
Note: All specified data, e.g. load resistance are valid in TALK mode only.
MICP1,
MICN1
X100
B2B
VMIC_I
AGND_I
EPP
MICP
X502
Western Jack
EPP1,
EPN1
S716,717
1
3
2
S712,713
1
3
2
5V0
MICP2,
MICN2
VMIC_I
AGND_I
EPP
EPP
MICP
MICP
X700
X701
Lumberg
Lumberg
EPP2,
EPN2
S714,715
1
3
2
S710,711
1
3
2
AGND_I
AGND_I
AGND
AGND
EPN
EPN
MICN
EPN
S731
1
3
S730
1
3
VMIC
AGND
AGND_I
VMIC_I
Feeding
Bridge
Feeding
Bridge
57
66
59,58
63,62
60,61
64,63
6R8
6R8
6R8
6R8
4
1
3
2
10
12
9
11
11
10
12
8
>=8 Ohm
32 Ohm
32 Ohm
Handset
Headset
Headset
Audio Interface 1:
Audio Interface 2:
MICP1_I,
MICN1_I
MICP2_I,
MICN2_I
or
+
+
+
Figure 14: Analog audio interface – overview