![Nokia RM-57 Service Manual Download Page 357](http://html.mh-extra.com/html/nokia/rm-57/rm-57_service-manual_1699439357.webp)
Description
Parameter
Min
Max
Unit
Notes
High-level
output
voltage
V
OH
0.8 x V
DDSHV2
V
DDSHV2
V
Low-level
output
voltage
V
OL
0
0.22 x V
DDSHV2
V
Rise/fall time
tR/tF
0
25
ns
(VDDSHV2 = 1.8V)
Headset hook detection interface (XMICN) electrical characteristics
Description
Min
Typ
Max
Unit
Notes
Hook detection
threshold 1
1.25
1.35
1.45
V
Two fixed
thresholds
inside Retu.
Selectable by
SW
Hook detection
threshold 2
0.5
0.6
0.7
V
Hook detection
hysteresis
25
mV
Hook detection
pull ups
1
2
4
uA
Audio signal electrical characteristics
Description
Parameter
Typ
Unit
Notes
XMIC N
Audio in
1
V
pp
DC Offset 2.5-2.78V
XMIC P
Audio in
1
V
pp
DC Offset 2.5-2.78V
HSEAR N
Audio out
1
V
pp
10Ω nominal serial
impedance
HSEAR P
Audio out
1
V
pp
10Ω nominal serial
impedance
HSEAR R N
Audio out
1
V
pp
10Ω nominal serial
impedance
Not connected in
mono
HSEAR R P
Audio out
1
V
pp
10Ω nominal serial
impedance
Not connected in
mono
RM-57/58
System Module
Nokia Customer Care
Issue 1
Company Confidential
Page 9–31
Copyright ©2005 Nokia. All Rights Reserved.
Summary of Contents for RM-57
Page 391: ...www s manuals com ...