
XT65/XT75 Hardware Interface Overview
6.5 Pin Assignment and Signal Description
s
XT65_XT75_HO_v00.130
Page 41 of 67
2006-10-12
Confidential / Preliminary
Analog
Audio
interface
VMIC
O
V
O
min = 2.4V
V
O
typ = 2.5V
V
O
max = 2.6V
I
max
= 2mA
Microphone supply for customer
feeding circuits
EPP2
O
3.0Vpp differential typical @ 0dBm0
4.2Vpp differential maximal @
3.14dBm0
Measurement conditions:
Audio mode: 6
Outstep 3
No load
Minimum differential resp. single
ended load 27Ohms
The audio output can directly
operate a 32-Ohm-loudspeaker.
If unused keep pins open.
EPN2
O
EPP1
O
4.2Vpp (differential) typical @
0dBm0
6.0Vpp differential maximal @
3.14dBm0
Measurement conditions:
Audio mode: 5
Outstep 4
No load
Minimum differential resp. single
ended load 7.5Ohms
The audio output can directly
operate an 8-Ohm-loudspeaker.
If unused keep pins open.
EPN1
O
MICP1
I
Differential Line Input Configuration.
Apply external bias of 1.5V at
MICN1
Full Scale Input Voltage: 1.6 Vpp
0dBm0 Input Voltage: 1.1 Vpp
Measurement conditions:
Audio mode: 5
^SNFI: 0,32767 => PGA = 0dB
Ri = 100 kOhm (typical)
Balanced or single ended micro-
phone or line input with external
feeding circuit (using VMIC and
AGND).
If unused keep pins open.
MICN1
I
MICP2
I
Differential Line Input Configuration.
Apply external bias of 1.5V at
MICN2
Full Scale Input Voltage1.6 Vpp
0dBm0 Input Voltage1.1 Vpp
Measurement conditions:
Audio mode: 6
^SNFI: 0,32767 => PGA = 0dB
Ri = 100 kOhm (typical)
Balanced or single ended micro-
phone or line input with external
feeding circuit (using VMIC and
AGND) and accessory detection
circuit.
If unused keep pins open.
MICN2
I
AGND
Analog Ground
GND level for external audio cir-
cuits
Table 17:
Signal description
Function
Signal name
IO
Signal form and level
Comment