Headset Hook Detection Interface (Xmicn) Electrical Characteristics; Audio Signal Electrical Characteristics - Nokia RM-57 Service Manual

RM-57/58
System Module
Description Parameter
High-level V
OH
output
voltage
Low-level V
OL
output
voltage
Rise/fall time
tR/tF

Headset hook detection interface (XMICN) electrical characteristics

Description Min
Hook detection 1.25
threshold 1
Hook detection 0.5
threshold 2
Hook detection
hysteresis
Hook detection 1
pull ups

Audio signal electrical characteristics

Description
XMIC N
XMIC P
HSEAR N
HSEAR P
HSEAR R N
HSEAR R P
Issue 1
Min
0.8 x V
DDSHV2
0
0
Typ
1.35
0.6
25
2
Parameter
Audio in
Audio in
Audio out
Audio out
Audio out
Audio out
Company Confidential
Copyright ©2005 Nokia. All Rights Reserved.
Max
V
DDSHV2
0.22 x V
DDSHV2
25
(VDDSHV2 = 1.8V)
Max
1.45
0.7
4
Typ
1
1
1
1
1
1
Unit Notes
V
V
ns
Unit
V
V
mV
uA
Unit
V
pp
V
pp
V
pp
V
pp
V
pp
V
pp
Nokia Customer Care
Notes
Two fixed
thresholds
inside Retu.
Selectable by
SW
Notes
DC Offset 2.5-2.78V
DC Offset 2.5-2.78V
10Ω nominal serial
impedance
10Ω nominal serial
impedance
10Ω nominal serial
impedance
Not connected in
mono
10Ω nominal serial
impedance
Not connected in
mono
Page 9–31