PLL FREQUENCY SHNTHESIZER FOR PAGER
S5T8808
INTRODUCTION
S5T8808 is a superior low-power-programmable PLL frequency
synthesizer which can be used in a high performance Wide Area
Pager system.
KS8808 consists of 2 kinds of divider block including a 17-bit Shift
register, 16-bit Latch, 14/16-bits Counter, Prescaler, and a phase
detector block including a Phase detector, Lock detector and a
Charge pump.
16−SSOP−0044
FEATURES
•
Maximum operating frequency:
150MHz @ 500mV
P-P
, V
DD1
= 0.95V
180MHz @ 500mV
P-P
, V
DD1
= 1.0V
(Magnification = 1 : 4)
•
•
On-chip reference oscillator supports external crystal which oscillates up to 18MHz
Superior supply current: (V
DD1
= V
DD2
= 1.0V, V
DD3
= 3.0V)
— F
FIN
= 90MHz, I
DD1
= 0.6mA (Typ.)
— F
FIN
= 150MHz, I
DD1
= 0.9mA (Typ.)
•
•
•
•
— F
FIN
= 180MHz, I
DD3
= 1.1mA (TyP.)
Operating voltage: V
DD1
= 0.95 ~ 2.0V and V
DD2
= 0.95V ~ 2.0V and V
DD3
= 2.0V ~ 3.3V
Reference frequency counter divider range: 1 / 28 ~ 1 / 65532 (Multiple 4)
But, the Divider range with FRC_High state: 1 / 7 ~ 1 / 16383
RX frequency counter divider range: 1 / 28 ~ 1 / 65535
Package type: 16-SSOP (0.8mm)
ORDERING INFORMATION
Device
S5T8808X01-V0B0
Package
16−SSOP−0044
Operating Temperature
−25°C
to +75°C
1
S5T8808
PLL FREQUENCY SHNTHESIZER FOR PAGE
PIN DESCRIPTION
Pin No
1
2
3
4
Symbol
OSCI
OSCO
V
DD3
PDA
I/O
I
O
−
O
Description
These input / output pins generate the reference frequency.
In case of an OSCI pin, external reference frequency can be input through an AC
coupling.
The highest potential supply terminal that can be supplied up to 2.0V ~ 3.3V,
except for V
DD1
and V
DD2
.
The Output of RX Phase detector terminal for active loop filter.
There are 3-kinds of output signal states according to Rx Loop Error
−
If Fr < Fn (Fr is leading), the output negative pulse state
−
If Fr > Fn (Fr is lagging), the output positive pulse state
−
If Fr = Fn (the same phase), the output is high impedance state
The Output of RX Phase detector terminal for active loop filter.
There are 3-kinds of output signal states according to Rx Loop Error
−
If Fr < Fn (Fr is lagging), the output negative pulse state
−
If Fr > Fn (Fr is leading), the output positive pulse state
−
If Fr = Fn (the same phase), the output is high impedance state
Ground terminal
Input terminal for 16-bit Divider from VCO.
Mostly, VCO output should be input through an AC coupling and the minimum
input level is 500mV
P-P
(in case of 90MHz)
Voltage supply terminal for Oscillator and Fin block. This pin can be supplied up
to 0.95 ~ 2.0V from V
SS
.
Voltage supply terminal for each Divider block (N & R counter).
This pin can be supplied up to 0.95V ~ 2.0V.
Lock detector is also an output of the Phase Detector.
The Low state of this output shows the unlock status, which is the error width
between the Ref. signal and the VCO output signal.
These pins are controlled by
µ-controller
and it also has Schmitt Trigger
architecture.
The features of these pins are as follows; Clock input for 17-bit Shift Register,
Serial data input (it include FnFr-on / off and FRC),
Latch enable input (User selectable EN1 or EN2)
Output terminal for divider value of N-counter. To control the output On/Off, the
FnFr bit of the Reference register can be programmed.
When FnFr bit set to High, this output shows low level.
Output terminal for divider value of N-counter. To control the output On/Off, the
FnFr bit of Reference register can be programmed.
When FnFr bit set to High, this output shows low level.
No Connection. (Internally biased Pull-up)
5
PDP
O
6
7
V
SS
Fin
−
I
8
9
10
V
DD1
V
DD2
LDT
I
I
O
11
12
13
14
CLK
DATA
EN
Fn
I
I
I
O
15
Fr
O
16
NC
−
4
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