LG LG-D175F User manual

Internal Use Only
Service Manual
LG-D175F
Date: March, 2014 / Issue 1.0

- 2 - Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Table Of Contents
1. INTRODUCTION..................................................................... 3
1.1 Purpose ........................................................................................................3
1.2 Regulatory Information.........................................................................3
1.3 Specication...............................................................................................5
2. PERFORMANCE...................................................................... 8
2.1 Product Name............................................................................................8
2.2 Supporting Standard..............................................................................8
2.3 Main Parts : GSM Solution.....................................................................8
2.4 HW Features ...............................................................................................9
2.5 SW Features............................................................................................. 14
2.6 HW SPEC. ................................................................................................. 18
3. TROUBLE SHOOTING .......................................................... 29
3.1 WCDMA Rx Part Troubleshooting................................................... 29
3.2 WCDMA Tx Part Trouble...................................................................... 52
3.3 GSM Rx Part Troubleshooting .......................................................... 81
3.4 GSM Tx Part Troubleshooting.........................................................100
3.5 Power TS..................................................................................................114
3.6 Charging .................................................................................................118
3.7 USB TS ......................................................................................................120
3.8 Audio TS ..................................................................................................121
3.9 3 AXIS Sensor on/o TS.....................................................................132
3.10 Proximity Sensor...............................................................................135
3.11 Touch Sensor Trouble Shooting..................................................137
3.12 Vibrator Trouble Shooting.............................................................139
3.13 3M Main Camera TS.........................................................................141
3.14 Main LCD TS ........................................................................................144
3.15 BT/Wi...................................................................................................147
3.16 GPS Part................................................................................................150
3.17 FM TS......................................................................................................153
3.18 D-TV........................................................................................................155
4. DOWNLOAD.......................................................................157
5. BLOCK DIAGRAM..............................................................174
6. CIRCUIT DIAGRAM ............................................................183
7. BGA PIN MAP.....................................................................198
8. PCB LAYOUT.......................................................................206
9. CALIBRATION.....................................................................208
10. HIDDEN MENU.................................................................227
11. DISASSEMBLE GUIDE .................................................233
12. EXPLODED VIEW & REPLACEMENT PART LIST .............240
12.1 EXPLODED VIEW................................................................................240
12.2 Replacement Parts ...........................................................................241
12.3 Accessory .............................................................................................268

- 3 - Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
1. Introduction
1. Introduction
This manual provides the information necessary to repair, calibration, description and download the features
of this model.
1.1 Purpose
1.2 Regulatory Information
A. Security
Toll fraud, the unauthorized use of telecommunications system by an unauthorized part (for example,
persons other than your company’s employees, agents, subcontractors, or person working on your
company’s behalf) can result in substantial additional charges for your telecommunications services.
System users are responsible for the security of own system. There are may be risks of toll fraud associated
with your telecommunications system. System users are responsible for programming and configuring
the equipment to prevent unauthorized use. The manufacturer does not warrant that this product is
i f th b b t ill t th i d f i
A.
Security
i
mmune
f
rom
th
e a
b
ove case
b
u
t
w
ill
preven
t
unau
th
or
i
ze
d
use o
f
common carr
i
er
telecommunication service of facilities accessed through or
connected to it. The manufacturer will not be responsible for any charges that result from such
unauthorized use.
B. Incidence of Harm
If a telephone company determines that the equipment provided to customer is faulty and possibly
causing harm or interruption in service to the telephone network, it should disconnect telephone
service until repair can be done. A telephone company may temporarily disconnect service as long as repair
is not done.
C. Changes in Service
A local telephone company may make changes in its communications facilities or procedure. If these
changes could reasonably be expected to affect the use of the phones or compatibility with the net work,
the telephone company is required to give advanced written notice to the user, allowing the user to take
appropriate steps to maintain telephone service.
D. Maintenance Limitation
Maintenance limitations on the phones must be performed only by the manufacturer or its authorized agent.
The user may not make any changes and/or repairs expect as specifically noted in this manual. Therefore,
note that unauthorized alternations or repair may affect the regulatory status of the system and may void any
remaining warranty.
E N ti f R di t d E i i
- 4 -
E
.
N
o
ti
ce o
f
R
a
di
a
t
e
d
E
m
i
ss
i
on
This model complies with rules regarding radiation and radio frequency emission as defined by local
regulatory agencies. In accordance with these agencies, you may be required to provide information such as
the following to the end user.
1. INTRODUCTION

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Only for training and service purposes
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1. INTRODUCTION
1. Introduction
F. Pictures
The pictures in this manual are for illustrative purposes only; your actual hardware may look slightly
different.
H. Electrostatic Sensitive Devices
A phone may interfere with sensitive laboratory equipment, medical equipment, etc. Interference from
unsuppressed engines or electric motors may cause problems.
G. Interference and Attenuation
ATTENTION
Boards, which contain Electrostatic Sensitive Device (ESD), are indicated by the sign. Following
information is ESD handling:
• Service
p
ersonnel should
g
round themselves b
y
usin
g
a wrist stra
p
when exchan
g
e s
y
stem boards.
p g y g p g y
• When repairs are made to a system board, they should spread the floor with anti-static mat which is
also grounded.
• Use a suitable, grounded soldering iron.
• Keep sensitive parts in these protective packages until these are used.
• When returning system boards or parts like EEPROM to the factory, use the protective package as
described
described
.
- 5 -

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1. INTRODUCTION
1. Introduction
1.3 Specification
KEY FEATURES
• Android 4.4-(KitKat)
• 3.5” Touch Screen HVGA (480 x 320)
• 3MP FF
• 3G Mobile Hotspot
ENHANCED USER EXPERIENCE
• Android 4.4
• Proximity Sensor – locks the touch screen and buttons while talking on the phone
• Motion Sensor – Accelerometer
•
USB Charging via Computer
USB
Charging
via
Computer
• Airplane Mode (RF Off)
DESIGN
• Sleek and Stylish Design
• 3.5“ HVGA LCD Screen
• Capacitive Touch Screen – Plastic with fast and accurate response
• Micro USB/Charging Port
- 6 -
1.3 Specication

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1. INTRODUCTION
1. Introduction
• 3MP FF
CAMERA/VIDEO
• Camera Resolutions: 2048 x 1536, 1280 x 960 Pixels
• Image Editor: zoom, rotate, crop images
• Brightness, ISO, White Balance,* Color Effects, Timer
• Cheese shutter – take photo with voice command.
• Video Resolutions: 640 x 480 320 x 240 176 x 144 Pixels
MULTIMEDIA
• Music Player for MP3, WMA, and Unprotected AAC
• Stereo Sound via Headset or Bluetooth
• Music Library – Organized by Artists, Albums, Songs, and Playlists
• Repeat and Shuffle Music Playback Modes
BLUETOOTH®
• Version: 4.0
• Supported Profiles: headset, hands-free, object push, advanced audio distribution (stereo), audio/video
remote control, file transfer, phone book access, message access, serial port
• Listen to Music with Optional Stereo Bluetooth Headset**
• Send User-Generated Pictures (JPEG) and Videos via Bluetooth Wireless Technology
*De
p
ends on available memor
y
.
p y
**Accessories sold separately.
- 7 -

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1. INTRODUCTION
VOICE/AUDIO
1. Introduction
• One-Touch Speakerphone*
• Speaker-Independent Voice Commands
• Voice-Activated Dialing
• Text to Speech
• MP3 Music Ringer Support
TOOLS & DATA
Android Apps: Alarm/Clock, Browser, Calculator, Calendar (Corporate or Google), Camera, Contacts,
Email, Gallery, Gmail, Google+, Maps, Messaging, Messenger, Music Player, Phone, Places, Play Books,
Play Movies, Play Music, Play Store, Talk, Video Player, Voice Recorder, Youtube
Navigation – spoken turn-by-turn directions showing real-time traffic
Wi-Fi Connectivity – IEEE 802.11 b/g/n
• A-GPS Support for Enhanced Location Accuracy
SPECIFICATIONS
• Technology: GSM/WCMDA
• Frequencies: GSM 850,900,1800,1900
• WCDMA 2100, 850
• Data Transmission: WCMDA, GPRS
• Dimensions: 109.4X59X11.9(mm)
• Display: 3.5" , HVGA (480 x 320) pixels
• Standard Battery: 1,700 [mAh]
ACCESSORIES
• Standard Battery
- 8 -
• Travel Adapter and USB Cable*
• Stereo Headset

2. PERFORMANCE
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2.1 Product Name
LG-D175f : WCDMA900/2100+EGSM/GSM850/DCS/PCS(HSDPA 14.4Mbps HSUPA 5.76Mbps)
2.2 Supporting Standard
Item Feature Comment
Supporting Standard WCDMA(FDD1,5)/EGSM/GSM850/DCS1800/PCS1900 with
seamless handover
Phase 2+(include AMR)
SIM Toolkit : Class 1, 2, 3, C-E
Frequency Range WCDMA(FDD1) TX : 1920 – 1980 MHz
WCDMA(FDD1) RX : 2110 – 2170 MHz
WCDMA(FDD5) TX : 824 – 849 MHz
WCDMA(FDD5) RX : 869 – 894 MHz
EGSM TX : 880 – 915 MHz
EGSM RX : 925 – 960 MHz
GSM850 TX : 824 – 849 MHz
GSM850 RX : 869 – 894 MHz
GSM900 TX : 880 – 915 MHz
GSM900 RX : 925 – 960 MHz
DCS1800 TX :1710 – 1785 MHz
DCS1800 RX : 1805 – 1880 MHz
PCS1900 TX : 1850 – 1910 MHz
PCS1900 RX : 1930 – 1990 MHz
Application Standard
2.3 Main Parts : GSM Solution
Item Part Name Comment
AP Chip MSM8210
CP Chip MSM8210
2. PERFORMANCE
2.1 Product Name
LG-D175f : WCDMA900/2100+EGSM/GSM850/DCS/PCS(HSDPA 14.4Mbps HSUPA 5.76Mbps)
2.2 Supporting Standard
2.3 Main Parts : GSM Solution
LGE Internal Use Only
2.1 Product Name
LG-D175f : WCDMA900/2100+EGSM/GSM850/DCS/PCS(HSDPA 14.4Mbps HSUPA 5.76Mbps)
2.2 Supporting Standard
Item Feature Comment
Supporting Standard WCDMA(FDD1,5)/EGSM/GSM850/DCS1800/PCS1900 with
seamless handover
Phase 2+(include AMR)
SIM Toolkit : Class 1, 2, 3, C-E
Frequency Range WCDMA(FDD1) TX : 1920 – 1980 MHz
WCDMA(FDD1) RX : 2110 – 2170 MHz
WCDMA(FDD5) TX : 824 – 849 MHz
WCDMA(FDD5) RX : 869 – 894 MHz
EGSM TX : 880 – 915 MHz
EGSM RX : 925 – 960 MHz
GSM850 TX : 824 – 849 MHz
GSM850 RX : 869 – 894 MHz
GSM900 TX : 880 – 915 MHz
GSM900 RX : 925 – 960 MHz
DCS1800 TX :1710 – 1785 MHz
DCS1800 RX : 1805 – 1880 MHz
PCS1900 TX : 1850 – 1910 MHz
PCS1900 RX : 1930 – 1990 MHz
Application Standard
2.3 Main Parts : GSM Solution
Item Part Name Comment
AP Chip MSM8210
CP Chip MSM8210

2. PERFORMANCE
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2.4 HW Features
List Type / Spec.
1. Phone Type DOP Type
2. Size 109.4X59X11.9 (mm)
3. Weight TBD
4. Battery 1,700mAh ( typ.), 1,650mAh(min) (Li-Ion)
5.Chipset MSM8210
6. Memory 4GB(eMMC) +4Gb(LPDDR2)
7. LCD Size 3.5 inch
Dot 480(H) X 320(V)
Color 262K/16.7M dithering
Display Type A-si TFT, Transmissive Type
NTSC 65%
Contrast Ratio 1:500
Pixel Pitch 0.051*RGB(v)*0.153(H)
Color temperature 5000 ~ 9000(K) ( typ. 6500K)
8. Main Camera (3M) Type CMOS image sensor
Resolution 2048(H) X 1536(V) pixels.
2.4 HW Features

2. PERFORMANCE
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Frame Rate 15 fps@ QXGA, 30 fps@ XGA
View Angle 65°
Image Scaling Down 3M, 2M,1M,VGA
Pixel x size 1.4um x1.4um
10. Audio 1) MIDI MIDI
2) Mono 19 X 10 X 3T Speaker, Receiver Dual mode
3) Receiver 19 X 10 X 3T Speaker, Receiver Dual mode
11. Bluetooth Effective Distance 10M
Distance 0 m ~ 10 m (depend on environment)
12. WLAN standard IEEE 802.11 b/g/n
Throughput Max 40Mbps (SDIO Driver performance)
depend on environment 0 ~ 50m (depend on environment)
13. GPS type A-GPS

2. PERFORMANCE
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1) RSSI Display
BAR WCDMA GSM/DCS/PCS
5Over -85 ±2dBm Over -92 ±2dBm
54-85 ±2dBm -92 ±2dBm
43-89 ±2dBm -96 ±2dBm
32-95 ±2dBm -100 ±2dBm
21-99 ±2dBm -104 ±2dBm
10-105 ±3dBm -106 ±3dBm
2) Charging Time
Under 3 hour 30min (1700mAh battery, 700mA TA)
r
3) Travel Charger
Input : 100 ~ 240 V, 50/60 Hz
Output : 5.1V, 700 mA
4) Battery Type
Li-ion Battery, 1650 mAh
Standard Voltage : 3.8 V, Battery Full Charge Voltage : 4.1V ~ 4.2V
3) Travel Charger
Input : 100 ~ 240 V, 50/60 Hz
Output : 5.1V, 700 mA
4) Battery Type
Li-ion Battery, 1650 mAh
Standard Voltage : 3.8 V, Battery Full Charge Voltage : 4.1V ~ 4.2V
1) RSSI Display
2) Charging Time
Under 3 hour 30min (1700mAh battery, 700mA TA)
LGE Internal Use Only
1) RSSI Display
BAR WCDMA GSM/DCS/PCS
5Over -85 ±2dBm Over -92 ±2dBm
54-85 ±2dBm -92 ±2dBm
43-89 ±2dBm -96 ±2dBm
32-95 ±2dBm -100 ±2dBm
21-99 ±2dBm -104 ±2dBm
10-105 ±3dBm -106 ±3dBm
2) Charging Time
Under 3 hour 30min (1700mAh battery, 700mA TA)
r
3) Travel Charger
Input : 100 ~ 240 V, 50/60 Hz
Output : 5.1V, 700 mA
4) Battery Type
Li-ion Battery, 1650 mAh
Standard Voltage : 3.8 V, Battery Full Charge Voltage : 4.1V ~ 4.2V

2. PERFORMANCE
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5) Current Consumption
** Test condition for Standby current consumption should be as below.
: Measurement time 1hr, with Agilent & CMT JIG
LGE Internal Use Only
5) Current Consumption
** Test condition for Standby current consumption should be as below.
: Measurement time 1hr, with Agilent & CMT JIG
Item Specification
WCDMA GSM
1. Sleep Mode Under 5mA Under 5mA
2. Sleep : connector Ear jack Under 6mA Under 6mA
3. Current(Sleep & Idle AVG) Under 10mA @ DRX 7 Under 10mA @ P.P 5
4. BT Connected idle Under 15mA Under 15mA
5. Talk Mode
- Max Pwr
Under 600mA @ Avg
- Tx 10dBm
Under 300 mA @ Avg
GSM LVL 5
under 300 mA @ Avg
6. Power Off Mode under 300uA Under 300 uA
7. Backup Battery under 5uA under 5uA

2. PERFORMANCE
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LGE Internal Use Only
6) Battery Bar
Battery Bar Specification
BAR 20 (Full) 98% over
remain%
BAR 20 --> 19 98% 97%
BAR 19 --> 18 93% 92%
BAR 18 --> 17 88% 87%
BAR 17 --> 16 83% 82%
BAR 16 --> 15 78% 77%
BAR 15 --> 14 73% 72%
BAR 14 --> 13 68% 67%
BAR 13 --> 12 63% 62%
BAR 12 --> 11 58% 57%
BAR 11 --> 10 53% 52%
BAR 10 --> 9 48% 47%
BAR 9 --> 8 43% 42%
BAR 8 --> 7 38% 37%
BAR 7 --> 6 33% 32%
BAR 6 --> 5 28% 27%
BAR 5 --> 4 23% 22%
BAR 4 --> 3 16% 15%
BAR 3 --> 2 13% 12%
BAR 2 --> 1 8% 7%
BAR 1 --> 0 3% 2%
Low Battery Pop-up 4% ~ 15% : One Time popup (No call)
Critical Low Battery Pop-up 0% ~ 3% : Every Level change popup (No
call)
Power Off 1%
6) Battery Bar

2. PERFORMANCE
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2.5 SW Features
Item Feature Comment
RSSI 0 ~ 5 Levels 0 ~ 4 => 0 ~ 5
Battery Charging 0 ~ 20 Levels
Key Volume 0 ~ 7 Level
Audio Volume 0 ~ 7 Level
Time / Date Display Yes
Multi-Language Yes
Danish / Spanish(España) / Spanish(SA) /
French(France) / French(Canada) / Italian /
Dutch / Polish / Portuguese(Portugal) /
Portuguese(Brasil) / Swedish /
Russian / English / Arabic / Chinese /
Korean / Japanese
Quick Access Mode Dialing/ Contact /Message/Menu
The user can edit as desired icon. (Menu
icon excluded)
Icon on the menu is the LONG-PRESS.
DRAG icon to where you want to register.
PC Sync Yes
Speed Dial Yes
Profile Yes not same with feature phone setting
CLIP / CLIR Yes
Phone Book
Name / Number / Email
/ Website/Postal
addresses/Organizations/Groups/
Birthday / Ringtone
There is no limitation on the number
of items.
It depends on
available memory amount.Ringtone can
be specified in the detail view screen.
Last Dial Number Yes Last Dial Numbers, Last Received
Numbers and Last Missed Numbers
2.5 SW Features

2. PERFORMANCE
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can store up to a total of 500.
Last Received
Number Yes
Last Dial Numbers, Last Received
Numbers and Last Missed Numbers
can store up to a total of 500.
Last Missed Number Yes
Last Dial Numbers, Last Received
Numbers and Last Missed Numbers
can store up to a total of 500.
Search by Number
/ Name Name
Group Yes
There is no limitation on the number
of items. It depends on
available memory amount.
Fixed Dial Number Yes
Service Dial Number No
Own Number Yes
Read only
(add/edit/delete are not
supported)
Voice Memo Yes
Call Reminder No
Network Selection Automatic
Mute Yes
Call Divert Yes
Call Barring Yes
Call Charge (AoC) No
Call Duration No
SMS (EMS) There is no limitation on the
number of items. It depends on
EMS does not support.

2. PERFORMANCE
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available memory
amount.
SMS Over GPRS No
EMS Melody / Picture No
Send / Receive / Save No
MMS MPEG4
Send / Receive / Save Yes
Long Message MAX 2000 characters
Cell Broadcast Yes
Download Over the Web
Game No
Calendar Yes
Memo No
World Clock No
Unit Convert No
Stop Watch No
Wall Paper Yes
WAP Browser No
Support only web browser based on
chrome.
WAP stack and wml are not supported.
Download Melody /
Wallpaper Yes Over web browser
SIM Lock Yes Operator Dependent
SIM Toolkit Class 1, 2, 3, C

2. PERFORMANCE
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LGE Internal Use Only
MMS Yes Google MMS Client
EONS Yes
CPHS Yes V4.2
ENS No
Camera Yes 3M FF /
Digital Zoom : x4
JAVA No
Voice Dial No
IrDa No
Bluetooth Yes
Version : v4.0
Profile : OPP, FTP, HFP 1.6, AVRCP 1.3, MAP,
PBAP, SAP, A2DP, HSP, SPP
FM radio Yes
GPRS Yes Class 12
EDGE Yes Class 12
Hold / Retrieve Yes
Conference Call Yes Max. 6
DTMF Yes
Memo pad No
TTY No
AMR Yes
SyncML Yes
IM No
Email Yes

2. PERFORMANCE
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2.6 HW SPEC
1) WCDMA transmitter specication
LGE Internal Use Only
2.6 HW SPEC.
1) WCDMA transmitter specification
Item Spec. Min Typ. Max Unit
Maximum Output
Power Power class Ⅲ21.0 23.0 25.0 dBm/3.84MHz
Frequency
Accuracy - -200 - +200 Hz
Minimum Output
Power - - - -50 dBm/3.84MHz
Occupied
Bandwidth - - - 4.6 MHz
Adjacent Channel
Leakage Power
Ratio
Δf = 5MHz - - -33 dBm/3.84MHz
Δf = 10MHz - - -43 dBm/3.84MHz
Error Vector
Magnitude(EVM) - - - 17 %
Peak Code
Domain Error - - - 15 dBm/3.84MHz
Open Loop
Output Power
Ior =-106.7dBm/3.84MHz -46.7 - -28.7 dBm/3.84MHz
Ior =-65.7dBm/3.84MHz -23.0 - -5.0 dBm/3.84MHz
Ior =-25.0dBm/3.84MHz -0.0 - 14.0 dBm/3.84MHz
Transmit Off
Power - - - -56 dBm/3.84MHz
Spectrum Δf = 2.5~3.5MHz -35-15 * (Δf-2.5) dBc/30KHz

2. PERFORMANCE
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LGE Internal Use Only
Emission Mask Δf = 3.5~7.5MHz -35-1 * (Δf-3.5) dBc/1MHz
Δf = 7.5~8.5MHz -39 10 * (Δf-7.5) dBc/1MHz
Δf = 8.5~12.5MHz -49 dBc/1MHz
Transmit Spurious
Emission
9kHz ~ 150kHz -36 dBm
150kHz ~ 30MHz -36 dBm
30MHz ~ 1GHz -36 dBm
1GHz ~ 12.5GHz -30 dBm

2. PERFORMANCE
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2) WCDMA receiver specification
Item Specification
Receive Frequency BD1: 2110 ~ 2170 MHz
BD5: 869 MHz ~ 894 MHz
Reference Sensitivity Level
<REFÎor>
Band1 : BER < 0.001 when Îor = -106.7 dBm / 3.84 MHz
Band5 : BER < 0.001 when Îor = -104.7 dBm / 3.84 MHz
Maximum Input Level BER < 0.001 when Îor = -25 dBm / 3.84 MHz
Adjacent Channel Selectivity
(ACS)
ACS > 33 dB where BER < 0.001 when
Îor = <REFÎor> + 14 dB / 3.84 MHz
& Ioac = –52 dBm / 3.84 MHz @ ±5 MHz
Blocking Characteristic
BER < 0.001 when Îor = <REFÎor> + 3 dB / 3.84 MHz
& Iblocking = -56 dBm / 3.84 MHz @ Fuw(offset) = ±10 MHz
or Iblocking = -44 dBm / 3.84 MHz @ Fuw(offset) = ±15 MH
z
Spurious Response BER < 0.001 when Îor = <REFÎor> + 3 dB / 3.84 MHz
& Iblocking = -44 dBm
Intermodulation
BER < 0.001 when Îor= <REFÎor> + 3 dB / 3.84 MHz
& Iouw1 = -46 dBm @ Fuw1(offset) = ±10 MHz
& Iouw2 = -46 dBm / 3.84 MHz @ Fuw2(offset) = ±20 MHz
Spurious Emissions < -57 dBm / 100 kHz BW @ 9 kHz ≤ f < 1 GHz
< -47 dBm / 1 MHz BW @ 1 GHz ≤ f ≤ 12.75 GHz
Inner Loop Power Control
In Uplink
Adjust output(TPC command)
cmd 1dB 2dB 3dB
+1 +0.5/1.5 +1/3 +1.5/4
0 -0.5/+0.5 -0.5/+0.5 -0.5/+0.5
-1 -0.5/-1.5 -1/-3 -1.5/-4
group(10equal command group)
+1 +8/+12 +16/+24
2) WCDMA receiver specication