Specifications

XT65/XT75 Hardware Interface Description
7.5 Pin Assignment and Signal Description
s
XT65_XT75_HD_v01.001 Page 100 of 133 2007-1-8
Confidential / Released
Digital
Analog
Converter
DAC_OUT O V
OL
max = 0.2V at I = 2mA
V
OH
min = 2.55V at I = -0.5mA
V
OH
max = 3.05V
PWM signal which can be
smoothed by an external filter.
Use the AT^SWDAC command to
open and configure the DAC_OUT
output.
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 29: Signal description
Function Signal name IO Signal form and level Comment