![background image](http://html1.mh-extra.com/html/fly/sdp100/sdp100_technical-manual_2311064052.webp)
M
ODEL
SDP100 V
ERSION
V_1.00
P
REPARED BY
H/W
D
ATE
25/05/2007
S
UBJECT
T
ECHNICAL
M
ANUAL
P
AGE
52/70
2.
Digital Core LDO (Vcore)
The digital core LDO is a regulator that could source 100mA with 1.2V
output voltage with Pin3(DANODE) GND. If Pin3 is not GND, The output Voltage is 1.8V. It supplies the
baseband circuitry in the handset. The LDO is optimized for very low quiescent current. SDP100 use 1.2V with
Pin 3 connected to GND.
3.
Digital IO LDO (DVDD)
The digital IO LDO is a regulator that could source 100mA with 2.8V output voltage. It supplies the baseband
circuitry in the handset.
4.
Analog LDO (AVDD)
The analog LDO is a regulator that could source 150mA with 2.8V output voltage. It supplies the analog sections
of the baseband chipsets. The LDO is optimized for low frequency ripple rejection in order to reject the ripple
coming from the RF Power Amplifier burst frequency at 217Hz. The Decoupling Capacitor C156 must be higher
than X5R type.
5.
TCXO LDO ( Vtcxo)
The TCXO LDO is a regulator that could source 20mA with 2.8V output voltage. It supplies the temperature
compensated crystal oscillator, which needs its own ultra low noise supply and very good ripple rejection ratio. The
Decoupling Capacitor C156 must be higher than X5R type.
6.
RTC LDO ( Vrtc)
The RTC LDO is a regulator that could source 200uA with 1.2V output voltage with Pin3 GND. If Pin3 is not
GND, The Output Voltage is 1.5V. It charges up a capacitor-type backup coin cell to run the real-time clock
module. The LDO features the reverse current protection. SDP100 uses 1.2V with Pin 3 connected to GND..
7.
Memory LDO ( Vmem)
The memory LDO is a regulator that could source 150mA with 1.8V or 2.8V output voltage selection based on the
supply specs of memory chips. It supplies the memory circuitry in the handset. If Pin45 VMSEL is connected to
GND, The VMEM is 1.8V. SDP100 uses 1.8V for MT6228 VDD33_EMI and SDRAM VDD,VDDQ.
8.
SIM LDO (Vsim)
The SIM LDO is a regulator that could source 20mA with 1.8V or 3.0V output voltage selection based on the
supply specs of subscriber identity modules card. The LDO is controlled independently of the others LDO.
9.
SIM card interface
It provides level shifting needs for low voltage GSM controller to communicate with either 1.8V or 3V SIM cards.
In SDP100, 3V SIM card is applied. All SIM cards contain a clock input, a reset input, and a bi-directional data
input/output. The clock and reset inputs to SIM cards are level shifted from the supply of digital IO of baseband
chipset to the SIM supply.
10.
Vibrator , Alerter, LED switches
SDP100
T
ECHNICAL
M
ANUAL
Page 3.52