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PDF S1T8825X01-R0B0 Data sheet ( Hoja de datos )

Número de pieza S1T8825X01-R0B0
Descripción 1.1GHZ DUAL PLL
Fabricantes Samsung semiconductor 
Logotipo Samsung semiconductor Logotipo



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No Preview Available ! S1T8825X01-R0B0 Hoja de datos, Descripción, Manual

PRELIMINARY ( VER.2.1 )
1.1GHZ DUAL PLL
INTRODUCTION
The S1T8825 is a high performance dual frequency synthesizer with
two integrated high frequency pre-scalers for RF operation up to 1.1
GHz.
The S1T8825 is composed of modulus pre-scalers providing 64 and
66, no dead-zone PFD, selectable charge pump current, selectable
power down mode circuits, lock detector output, and loop filters time
constant switch.
It is fabricated using the ASP5HB Bi-CMOS process and is available
16-TSSOP with surface mount plastic packaging. Serial data is trans-
ferred into the S1T8825 via three-wire interface (CK, DATA, EN).
16TSSOP0044
FEATURES
• Two systems for receiver and transmitter
• Very low operating current consumption: Icc = Typ. 5.5mA @ 3.0V
• Low operating power supply voltage : 2.2 ~ 5.5V ( 200MHz ~ 550MHz Operating )
2.7 ~ 3.6V ( 550MHz ~ 1.1GHz Operating )
• Modulus pre-scaler: 64 / 66
• No dead-zone PFD
• Colpitts type local oscillation
• Selectable charge pump current
• Selectable power down mode
• TSSOP 16-pin package (0.65 mm pitch)
ORDERING INFORMATION
Device
+S1T8825X01-R0B0
Package
16TSSOP0044
+: New Product
Operating Temperature
30 °C to + 85 °C
APPLICATIONS
• Cordless telephone systems
• Portable wireless communications (PCS)
• Wireless Local Area Networks (WLANs)
• Other wireless communication systems
S1T8825
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S1T8825X01-R0B0 pdf
PRELIMINARY ( VER.2.1 )
1.1GHZ DUAL PLL
S1T8825
FUNCTIONAL DESCRIPTIONS
SERIAL DATA INPUT AND TIMING
CK (Pin6), DATA (Pin7), EN (Pin8) terminals in S1T8825 are used for MCU serial data interface (MSB: 1st input
data; LSB: Last input data). Serial data controls the programmable reference divider, programmable divider (CH1),
programmable divider (CH2), and control latch separately by means of group code. Binary serial data is entered via
the DATA pin.
One bit of data is shifted into the internal shift register on the rising edge of the clock. When EN pin is high, stored
data is latched. The three terminals, CK, DATA, and EN, contain Schmitt trigger circuits to keep the data from
errors caused by noise, etc.
< Notice >
1. When power supply of S1T8825 is disconnected, CLK, DATA, EN port from MCU should be pulled low.
2. When power goes up first, R counter data should be entered earlier than N1 and N2 counter data.
3. When power goes up first, control data should be entered earlier than N1 and N2 counter data.
1us
0.2us
0.2us
CK
DATA
MSB
N1 (R1)
0.2us
N2 (R2) N3 (R3)
0.1us
EN
NOTE: Start data input with MSB first
N16 (R11) N17 (R12) GC2
LSB
GC1
0.1us
MSB
0.2us
Figure 1.
0.2us
SERIAL DATA GROUP AND GROUP CODE
The S1T8825 can be controlled through 4 kinds of group selection. Each group is identified by selective a 2-bit
group code given below.
Serial Bits
GC1 (LSB) GC2 (LSB-1)
00
01
10
11
Group Location
Control Latch
Ch 1 N Latch
Ch 2 N Latch
OSC R Latch
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S1T8825X01-R0B0 arduino
PRELIMINARY ( VER.2.1 )
1.1GHZ DUAL PLL
S1T8825
PROGRAMMABLE REFERENCE COUNTER
This block generates the reference frequency for the PLL.
The reference divider is composed of 12-bit reference divider and a half fixed divider
Sending certain data to the reference divider allows the setting of any of 6 to 8190 divisions (multiple of two).
MSB
LSB
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10 R11 R12
GC2
"1"
GC1
"1"
Division Ratio of the R counter, R
Group Code
R = R1 × 20 + R2 × 21 + + R12 × 211
Division ratio: 2 × R = 2 × (3~4095) = 6 ~ 8190
Data is shifted in MSB first.
Division
Ratio
3
4
4095
R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1
000000000011
000000000100
••••••••••••
111111111111
Example) A 21.25MHz X-tal oscillator is connected, and divided into 25kHz steps.
(Reference frequency is 12.5kHz)
21.25 MHz ÷ 12.5 kHz = 1700
1700 = 2 × R
R = (850)10 = (1101010010)2
MSB
LSB
01001010110011
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