▶Z720i is base on the CDMA NMT-450 technology. This technology using
the 1.25MHz spread-spectrum of 450MHz band, this CDMA NMT-450
cellular phone provides greatly enhanced voice quality and more
reliable
encoding function.
▶The IFR3500 is a key circuit element in the Rx signal path of CDMA450.
The CDMA receive path is designed to accept a differential IF signal with
CDMA spread spectrum modulation extending ±630KHz from the IF
center frequency. The RFT3100 interface with the MSM5100 and circuits
in
the analog transmit chain of the CDMA450 phone. The RFT3100 up
converts to the IF frequency and puts out a controlled amplitude
differential Tx IF signal. The RFT3100 & IFR3500 are controlled by means
of a three-line Serial Bus Interface(SBI) which is driven by MSM5100.
▶LCD Module consists of Main LCD(128x160Dots,1.8” 65K Color CSTN)
and SUB LCD(96x64Dots B/W CSTN LCD)
▶ 300K CMOS Camera Module supported 30 photo save at QVGA mode
(320x240), Linear 4X Digital Zoom
▶ 16 POLY CMX Melody
▶ PC Sync(USB)
Copyrights 2004 ⓒ Pantech & CuritelZ720i
1.2 Standards & Specification
1.2.1 Standards
▶ Air interface standard : IS-2000
▶ Vocoder : IS-96A,IS-127,IS-733
▶ Data Service : IS-707A
▶ RF specification : IS-98D
▶ OTASP : IS-638A
▶ SMS : IS-637
1.2.2 Specification
▶ POWER SUPPLY Adapter
1) INPUT : CTA-10A, 100-24V(AC) 50/60Hz 0.3A
2) OUTPUT : DC 5.5V, 2000mA
3) CHARGER: inner-charger
▶ BATTERY
TYPE : Ni-ion,1000mAh(553450)
▶ POWER CONSUMPTION
1) NORMAL(Stand-by) : CDMA Mode : 100 mA (During call waiting),
700 ㎃±10% (While busy, LCD On ,based
on Max Pwr(+23 dBm) )
2) Waiting Time : About 120hours
* Field Conditions Applied
* Slot Cycle Index : 2
* Power Consumed in Sleep Mode: less than 1 mA
- The duplexer is made up of a TX_Filter and RX_Filter. It is composed of an antenna port, a transmitter port and a receiver
port. The TX-Filter is configured with a SAW bandpass filter. This prevents harmonic spurious emission and leakage from
entering into adjacent channels. The RX-filter is also configured with a SAW bandpass filter. It suppresses the malfunction
of LNA while sufficiently rejecting strong neighboring interferes. Thus the choice of BPF is governed by both the out-of-band
rejection and the in-band loss, with the latter being the more critical parameter. prevents image spurious by transmit carrier
signal. The special matching circuit is adopted to increase the isolation between the transmitter and the receiver. Since large
in-band interferers accompany the received signal even after the duplexer and this large in-band interferes make cross
modulation with the leakage from the transmitter, the isolation between the transmitter and the receiver is very important.
▶ ITM1010 (U210)
- ITM1010 is composed of low noise amplifiers (LNA) and down-conversion mixer. The LNA figures a sufficiently
high IP3 to avoid corruption of the signal by intermodulation products. The IP3 of LNA affects single tone de-sensitization
performance. The LNA is operated ON and OFF by LNA Range signal which come to MSM directly. LNA-ON gain has about
17dB and LNA-OFF gain has about -7dB. The image rejection BPF is configured with a SAW bandpass filter which is the
same filter as the RX-Filter in the duplexer section. Since the image frequency of the received signal is downconverted to the
same IF bands,it is very important to suppress the image. The down-conversion mixer is included in ITM1010 chip. It makes
85.38 MHz IF signal mix RF signal with Local signal.
▶ Rx SAW Filter (FIL220)
- It suppresses the malfunction of LNA while sufficiently rejecting strong neighboring interferes
Copyrights 2004 ⓒ Pantech & CuritelZ720i
▶ IFR3500 (U650)
- IFR3500 receive path is designed to accept a differential IF signal. Rx AGC amplifies controlled by varying the DC voltage
on the Vcontrol input pin attenuates the received CDMA IF signal to provide a constant-amplitude signal to the I/Q down
converter. The AGC’s 90dB dynamic range is available over the full power supply range of the device.
▶ Rx IF SAW Filter (FIL230)
-
The IF Filter attenuates the noise of signal that has been down-converted in the mixer. It is used to extract signals orresponding
to one channel bandwidth.
2) TX PART
▶ RFT3100(U700)
- The RFT3100 interface with the MSM5100 and circuits in the analog transmit chain of the CDMA450 phone. The RFT3100 up
converts to the IF frequency and puts out a controlled amplitude differential Tx IF signal. The RFT3100 is controlled by means of
a three-line Serial Bus Interface(SBI) which is driven by MSM5100.The RFT3100 includes a programmable Tx PLL for synthesizing
the Tx IF frequency. A temperature-compensated Tx AGC amplifier with 85dB gain range is included in the RFT3100. The transmit
output power level is directly controlled by varying the gain of this Tx AGC amplifier.
▶ Power Amp(U250)
- This is a part to amplify TX power for the last time. It has a direct effect on variable range of –54 dBm ~ +23.5 dBm for ANT
output part. Accordingly, During the call, it consumes most of current supplied and so, it should ensure high efficiency.
▶ Tx Saw Filter (FIL270)
- This is a part to reduce out-band noise and Before PAM amplifies the RF Signal, attenuate in-band noise
Copyrights 2004 ⓒ Pantech & CuritelZ720i
3) LOGIC Parts
▶ MSM5100
- MSM5100 is the ASIC Chip for Baseband Digital Signal Processing of the handset. It implies the integrated
CODEC and supports Integrated Universal Serial Bus(USB) interface. And it has internal Vocoder supporting
13Kbps QCELP and 8Kbps EVRC. Besides it uses ARM7TDMI embedded microprocessor subsystem.
▶ MEMORY
- SHARP’s Product consisted of 128M Flash Memory and 32M Smart combo RAM used to save MSM Boot Code and
NV Data
▶ LCD MODULE
- As Dual CSTN-LCD Module combined Main LCD and Sub LCD, and it has Flash LED and 300K CMOS Camera
Module, Main LCD display 65k color 128 X 160 Dots. Sub LCD display B/W color 96 X 64 Dots.
* MAIN : 1.8”, 65 K CSTN,128X160
* SUB : B/W CSTN, 96 X 64
▶ SPICOM
- SPICOM is combined Receiver, Speaker and Vibrator
* RPM : MAX 12,000 ±2,000 Operating Voltage : DC 2.6V ~ 3.6V
Copyrights 2004 ⓒ Pantech & CuritelZ720i
▶ CAMERA Module
- HX-550C adopts 300K CMOS camera module that supports 30 supported 30 photo save at QVGA
mode (320x240), Linear 4X Digital Zoom photo
Copyrights 2004 ⓒ Pantech & CuritelZ720i
2.2.1 Block Diagram (RF Part)
RF_SA W
RF_SA W
D46 5AK (Sam sun g)
D46 5AK (Sam sun g)
G : - 2.3 ~ -2.7 dB
G : - 2.3 ~ -2.7 dB
REJECTION(452.5~458) :
REJECTION(452.5~458):
-55 ~ - 64
-55 ~ - 64
LNA
ITM1010(Integrant)
G : 17dB
NF :1.6dB
IIP :9.5dBm
462.500~467.475MHz
RF _SA W
D465AK(SAMSUNG)
G - 2dB
REJECTION(452.5~458) :
-50 ~ - 64
ISO LAT ION : - 50 ~ -6 6dB C
RF _SA W
D4 55AK (SA MSU NG )
G : -3.06 dB
REJECTION(462.5~467.475) :
-5 1 ~ - 64
452.5000~457.475MHz
RF _SA W
D455AK(SAM SUNG)
G : -2.5d B
REJECTION(462.5~467.475) :
POWER AMP
-4 7 ~ - 74
RF SAW
ANT.
RF CON
G : -0.1d B
RF SAW
Rx
Tx
S KY77148
(S KYW OR KS)
G : 30 dB(H igh G ain), 2 4dB (Low Ga in)
N F : 4d B
P1 dB = 31d Bm
IDLE : 75m A(H igh P WR Mod e)
CU RRE NT @ Po ut = 2 9dB m
720m A(V CC =3.8V Vref= 3V V con t=0V)
AC PR @ Po ut = 2 9dB m
-50 .1dB C@ offset 8 85K Hz
Up-Converter
ITM1010(Integrant)
G :10dB
NF : 2 .2dB
IIP3 : -7 .6dB m
LO RANGE-10 dBm Typ
Rx_LO
(insertion loss : 0.429dB)
452.5000~457.475MHz
MSFB43-85-001M0(KSS)
REJECTION : 55dB
ISOL ATION : - 25.8dB
6dB ATTENUATOR(1)
BUFFER_AMP
MAX2473
(MAX IM)
GAIN : 15d B
P1dB : 3.1dBm
CURRENT : 10mA
REVERSE ISOLATION
-53.7 dBC
RX IF SAW
G : -10dB
RX IF = 85.38MHz
IF SA W
PLL Module
PO1603UA
(SAM SUN G)
Lock time :
2ms(TYP)~5ms(MAX)
Phase noise :
-120dBc@100kHz
Po= 0~3dBm
547.880MHz~552.855MHz
COUPLER
(HITAC HI_METAL)
PLL
RFT3100
Output pw r
-83.2(min) ~
0.8(max)dBm
-94 ~ 4.5dBm(typ)
Tx mode
20 ~ 40mA
SLEEP MODE
0.07mA
TCXO
RFOUT
SLC-S090T-055
(coupling : 14.5dB)
LPF
KT18B-DCV27N-19.200M
Tx_LO
190.76MHz
Input pwr
-102~-12dBm
Rx mode
26mA
SLEEP MODE
0.4mA
IFR3500
TANK
VC_TCXO
(KYOC ERA )
Refere nce fre quen cy
19.2MHz
LPF
TANK
MSM 5100
TCX O / N
170.76MHz
TCXO
Copyrights 2004 ⓒ Pantech & CuritelZ720i
2.2.2 Block Diagram (LOGIC Part)
PAM
RF
and
IF
circuits
IFR
&
RFT
VBAT
T
PA_R1
No use
PA_ON <H >
PA_R0
<H:PAM gain=Low>
LNA_RANGE <H: Hig h G ain>
TRK_LO_ADJ
TX_AGC_ADJ
RX_AGC_ADJ