PTC FS8107E

FS8107E Low Power Phase-Locked Loop IC
Princeton Technology Corp. reserves the right to change the product described in this datasheet. All information contained in this datasheet is subject to change without prior notice. Princeton Technology Corp. assumes no responsibility
for the use of any circuits shown in this datasheet.
Description
The FS8107E is a serial data input, phase-locked loop IC with programmable input and
reference frequency dividers. When combined with a VCO, the FS8107E becomes the
core of a very low power frequency synthesizer well-suited for mobile communication
applications such as paging systems. Compared to the FS8100, the FS8107E is housed
in a smaller package and also implements a separate pin for stand-by control.
Features
‹ High maximum input operating frequency — 100 MHz at VDD1 = 1.0 V
‹ Up to 22 MHz internal crystal oscillator reference frequency at VDD1 = 1.0 V
‹ Extremely low current consumption (IDD,total typically 0.4 mA at fFIN = 90 MHz)
‹ 16-bit programmable input frequency divider (including a ÷ 32/33 prescaler) with
divide ratio range from 992 to 65535
‹ 13-bit programmable reference frequency divider (including a ÷ 8 prescaler) with
divide ratio range from 40 to 65528
‹ Optional lock detector output
‹ Charge pump output for passive low-pass filter
‹ Quick-lock signal output for faster locking
‹ Separate pin for stand-by control
‹ TSSOP 16L package (0.65mm pitch)
Applications
‹ Pager
‹ Wireless communication system
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April 2003
FS8107E
Package and Pin Assignment: 16L, TSSOP
Symbols
Dimensions in mm
1
16
2
15
HiMARK
FS8107E
XIN
XOUT
VDD2
DB
DO
VSS
FIN
VDD1
3
4
5
6
7
8
14
13
12
11
10
9
TEST
NC
OPR
LE
DATA
CLK
LD
NC
Dimensions in inch
MIN.
NOM.
MAX.
MIN.
NOM.
MAX.
A
---
---
1.20
---
---
0.048
A1
0.05
---
0.15
0.002
---
0.006
A2
0.80
1.00
1.05
0.031
0.039
0.041
b
0.19
---
0.30
0.007
---
0.012
C
0.09
---
0.20
0.004
---
0.008
D
4.90
5.00
5.10
0.193
0.197
0.201
E
---
6.40
---
---
0.252
---
E1
4.30
4.40
4.50
0.169
0.173
0.177
e
---
0.65
---
---
0.026
---
L
0.45
0.60
0.75
0.018
0.024
0.030
y
---
---
0.10
---
---
0.004
θ
0°
---
8°
0°
---
8°
Note: Tolerance + 0.1mm unless otherwise specified
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FS8107E
Pin Descriptions
Number
Name
I/O
Description
1
XIN
I
Reference crystal oscillator or external clock input with internally biased amplifier
(any external input to XIN must be ac-coupled)
2
XOUT
O
Reference crystal oscillator or external clock output
3
VDD2
POWER
4
DB
O
Single-ended quick-lock output for faster locking
5
DO
O
Single-ended charge pump output for passive low pass filter
6
VSS
GND
7
FIN
I
8
VDD1
POWER
9
NC
NC
10
LD
O
Lock detector output (high when PLL is locked)
11
CLK
I
Shift register clock input
12
DATA
I
Serial data input
13
LE
I
Latch enable input
14
OPR
I
Battery-save control input; normal operation when high, stand-by mode when low
15
NC
NC
16
TEST
I
Nominal 3.0 V supply voltage
Ground
VCO frequency input with internally biased input amplifier
(any external input to FIN must be ac-coupled)
Nominal 1.0 V supply voltage
No connection
No connection
Test mode control input with internal pull-down resistor
Block Diagram
FIN
DATA
CLK
LE
TEST
OPR
XIN
÷ 32/33
N-COUNTER
LOCK
DETECTOR
N-LATCH
CONTROL
LOGIC
SHIFT REGISTER
PFD
R-LATCH
÷8
LD
CHARGE
PUMP
DO
QUICKLOCK
DB
R-COUNTER
WINDOW
GENERATOR
XOUT
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FS8107E
Absolute Maximum Ratings
VSS = 0 V
Parameter
Symbol
Rating
Unit
VDD1
VSS – 0.3 to VSS + 2.0
V
VDD2
VSS – 0.3 to VSS + 7.0
V
Input voltage range
VFIN
VSS – 0.3 to VDD + 0.3
V
Operating temperature range
TOPR
–10 to 60
o
C
Storage temperature range
TSTG
–40 to 125
o
C
Soldering temperature range
TSLD
255
o
C
Soldering time range
tSLD
10
Supply voltage
s
Recommended Operating Conditions
VSS = 0 V
Parameter
Symbol
Value
Unit
min.
typ.
max.
VDD1
0.95
1.0
2.0
V
VDD2
2.0
3.0
3.3
V
TA
–10
25
60
o
Supply voltage range
Operating temperature
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April 2003
FS8107E
Electrical Characteristics
(VDD1 = 0.95 to 2.0 V, VDD2 = 2.7 to 3.3 V, VSS = 0 V, TA = 0 to 60°C unless otherwise noted)
Parameter
Symbol
Condition
IDD,total
VDD1 = 1.0 V, OPR=”H”,
VFIN = 0.3 Vpk-pk sinusoid,
fFIN = 100 MHz,
VXIN = 0.3 Vpk-pk sinusoid,
fXIN = 12.8 MHz
IDD,standby
VDD1 = 0 V, OPR=”L”
FIN max. operating frequency
fFIN,max
VFIN = 0.3 Vpk-pk sinusoid
FIN min. operating frequency
fFIN,min
VFIN = 0.3 Vpk-pk sinusoid
XIN max. operating frequency
fXIN,max
VXIN = 0.3 Vpk-pk sinusoid
XIN min. operating frequency
fXIN,min
VXIN = 0.3 Vpk-pk sinusoid
Current consumption
Standby current consumption (IDD2)
Value
min.
Unit
typ.
max.
0.40
1.10
mA
10
µA
100
MHz
40
22
MHz
MHz
7
MHz
FIN input voltage swing
VFIN
0.3
Vpk-pk
XIN input voltage swing
VXIN
0.3
Vpk-pk
CLK, DATA, LE logic LOW input voltage
VIL
CLK, DATA, LE logic HIGH input voltage
VIH
0.3
1.5
V
V
XIN logic LOW input current
IIL,XIN
VIL = 0 V
10
µA
XIN logic HIGH input current
IIH,XIN
VIH = VDD1
10
µA
FIN logic LOW input current
IIL,FIN
VIL = 0 V
60
µA
FIN logic HIGH input current
IIH,FIN
VIH = VDD1
60
µA
DO logic LOW output current
IOL,DOP
VOL = 0.4 V
1.0
mA
DO logic HIGH output current
IOH,DOP
VOH = VDD2 – 0.4 V
1.0
mA
LD, FV, FR logic LOW output current
IOL
VOL = 0.4 V
0.1
mA
LD, FV, FR logic HIGH output current
IOH
VOH = VDD2 – 0.4 V
0.1
mA
DATA to CLK setup time
tSU1
2
µs
CLK to LE setup time
tSU2
2
µs
tHOLD
2
µs
Hold time
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FS8107E
Functional Description
Programmable Input Frequency Divider
The VCO input to the FIN pin is divided by the programmable divider and then internally
output to the phase/frequency detector (PFD) as fV. The programmable input frequency
divider consists of a ÷ 32/33 (P/P+1) dual-modulus prescaler and a 16-bit (N) counter,
which is further comprised of a 5-bit swallow (A) counter, and a 11-bit main (B) counter.
The total divide ratio, M, is related to values for P, A, and B through the relation
M = (P + 1) × A + P × (B – A) = P × B + A,
with B ≥ A . The minimum programmable divisor for continuous counting is given by
P × ( P – 1 ) = 32 × 31 = 992, and the valid total divide ratio range for the input
divider isM = 992 to 65535.
Programmable Reference Frequency Divider
The crystal oscillator output is divided by the programmable divider and then internally
output to the PFD as fR. The programmable reference frequency divider consists of a fixed
÷ 8 (S) prescaler and a 13-bit reference (R) counter. The total divide ratio, T, is related to
values for S and R through the relation
T = S × R = 8 × R.
The usable divisor range of reference counter is R = 5 to 8191, and therefore, the valid
total divide ratio range for the reference divider isT = 40 to 65528 (in steps of 8.)
Serial Input Data Format
The divide ratios for the input and reference dividers are input using a 17-bit serial interface consisting of separate clock (CLK), data (DATA), and latch enable (LE) lines. The
format of the serial data is shown in Fig. 1. The data on the DATA line is written to the
shift register on the rising edge of the CLK signal and is input with MSB first, and the last
(17th) bit is used as the latch select control bit. The data on the DATA line should be
changed on the falling edge of CLK, and LE should be held low while data is being written to the shift register. Data is transferred from the shift register to one of the frequency
divider latches when LE being set high. When the 17th bit is set low, data is loaded to the
16-bit N-counter latch, and when the 17th bit is set high, the 13 MSBs are loaded to the
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FS8107E
13-bit R-counter latch and the remaining 3 LSBs are used to control testing modes and
should be set as follows for normal operation: R14 = high, R15 = low, R16 = low. To disable LD output (i.e. set LD low), R14 should be set low.
Serial input data timing waveforms are shown in Fig. 2.
Fig. 1 – Serial input data format
MSB
13-bit data for R-counter
R14
R15
R16
CONTROL BIT
LSB
16-bit data for N-counter
Fig. 2 – Serial input data timing waveforms
DATA
tHOLD
tSU1
CLK
tSU2
DATA
1
2
3
4
5
6
7
8
CONTROL BIT
LSB
MSB
LE
9 10 11 12 13 14 15 16 17
CLK
LE
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April 2003
FS8107E
Phase/Frequency Detector (PFD)
The PFD compares an internal input frequency divider output signal, fV, with an internal
reference frequency divider output signal, fR, and generates an error signal, DO, which is
proportional to the phase error between fV and fR. The DO output is intended for use with a
passive filter as shown in Fig. 3.
The input/output waveforms for the PFD are shown in Fig. 4.
Fig. 3 – Passive low-pass filter circuit
R1
DO
to VCO
R2
C
Fig. 4 – PFD input/output waveforms
fR
fV
high-Z
high-Z
DO
high-Z
LD
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April 2003
FS8107E
Quick-lock Signal (DB)
The quick-lock output signal, DB, is provided so that the PLL may achieve higher speed
locking. When connected, the DB output effectively doubles the charge pump current output to the loop filter during the initial start-up of the PLL (when OPR first goes high).
Once the PLL phase error is within a specific tolerance, the quick-lock circuitry sets the
DB output to a high impedance state and the PLL continues toward lock with its normal
charge pump current.
Stand-by Mode
The stand-by mode for the PLL is entered by setting the OPR pin low and VDD1 to 0 V
while the circuit is in operation. In the stand-by mode, the XIN and FIN amplifiers, Ncounter, and R-counter are stopped, the N- and R-counters are also reset, and the DO and
DB outputs are set to the high impedance state. As long as voltage is supplied to VDD2,
data loaded to the latches is kept. To exit from stand-by mode to normal operation, the
OPR pin must be set high and voltage must again be supplied to VDD1.
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FS8107E
Application Circuit
LNA
1st mixer
1st IF
amplifier
2nd mixer
2nd IF
amplifier Discriminator
Wave
shaper
LPF
Frequency
multiplier (×2,3)
2nd LO
1st LO
XIN
TEST
NC
VDD2
OPR
DB
DO
VSS
FIN
VDD1
HiMARK
FS8107E
XOUT
RAM
ROM
CPU
Decoder
LE
DATA
CLK
LD
NC
LCD driver
Driver
LCD
DC/DC
converter
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April 2003