ICST ICS84329BM-01T 700mhz, low jitter, crystal-to-3.3v differential lvpecl frequency synthesizer Datasheet

ICS84329B-01
Integrated
Circuit
Systems, Inc.
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
FEATURES
The ICS84329B-01 is a general purpose, single
output high frequency synthesizer and a member
HiPerClockS™
of the HiPerClockS™ family of High Performance
Clock Solutions from ICS. The VCO operates at a
frequency range of 250MHz to 700MHz. The VCO
frequency is programmed in steps equal to the value of the
crystal frequency divided by 16. The VCO and output frequency
can be programmed using the serial or parallel interfaces to
the configuration logic. The output can be configured to divide
the VCO frequency by 1, 2, 4, and 8. Output frequency steps
as small as 125kHz to 1MHz can be achieved using a 16MHz
crystal depending on the output dividers.
•
•
•
•
•
•
BLOCK DIAGRAM
PIN ASSIGNMENT
ICS
•
•
•
•
•
•
Fully integrated PLL, no external loop filter requirements
1 differential 3.3V LVPECL output
Crystal oscillator interface
Output frequency range: 31.25MHz to 700MHz
VCO range: 250MHz to 700MHz
Parallel interface for programming counter
and output dividers during power-up
Serial 3 wire interface
RMS Period jitter: 5.5ps (maximum)
Cycle-to-cycle jitter: 35ps (maximum)
3.3V supply voltage
0°C to 70°C ambient operating temperature
Lead-Free package fully RoHS compliant
M0
M1
M2
M3
M4
M5
M6
M7
M8
N0
N1
VEE
TEST
VCC
XTAL_IN
OSC
XTAL_OUT
÷ 16
PLL
PHASE DETECTOR
1
VCO
÷M
FOUT
nFOUT
ICS84329B-01
0
TEST
VEE
TEST
25 24 23 22 21 20 19
S_CLOCK
26
S_DATA
27
S_LOAD
28
VCCA
nc
nc
XTAL_IN
17
N0
16
M8
28-Lead PLCC
15
11.6mm x 11.4mm x 4.1mm
14
2
V Package
13
3
Top View
M7
12
M4
ICS84329B-01
1
4
7
8
9 10 11
M6
M5
M0
M1
M3
6
M2
5
nP_LOAD
1
N1
Vcc
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18
XTAL2_OUT
84329BM-01
VCC
N0:N1
VEE
VCC
M0:M8
nFOUT
CONFIGURATION
INTERFACE
LOGIC
28-Lead SOIC
7.5mm x 18.05mm x 2.25mm package body
M Package
Top View
FOUT
S_LOAD
S_DATA
S_CLOCK
nP_LOAD
÷1
÷2
÷4
÷8
nP_LOAD
VCC
XTAL_OUT
XTAL_IN
nc
nc
VCCA
S_LOAD
S_DATA
S_CLOCK
VCC
FOUT
nFOUT
VEE
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
REV. A JUNE 10, 2005
ICS84329B-01
Integrated
Circuit
Systems, Inc.
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
FUNCTIONAL DESCRIPTION
M8 and N0 through N1 is passed directly to the M divider and
N output divider. On the LOW-to-HIGH transition of the
nP_LOAD input, the data is latched and the M divider remains
loaded until the next LOW transition on nP_LOAD or until a
serial event occurs. The TEST output is Mode 000 (shift register out) when operating in the parallel input mode. The relationship between the VCO frequency, the crystal frequency
and the M divider is defined as follows: fVCO = fxtal x M
16
The M value and the required values of M0 through M8 are
shown in Table 3B, Programmable VCO Frequency Function
Table. Valid M values for which the PLL will achieve lock are
defined as 250 ≤ M ≤ 511. The frequency out is defined as
follows: fout = fVCO = fxtal x M
N
N
16
Serial operation occurs when nP_LOAD is HIGH and S_LOAD
is LOW. The shift register is loaded by sampling the S_DATA
bits with the rising edge of S_CLOCK. The contents of the
shift register are loaded into the M divider when S_LOAD transitions from LOW-to-HIGH. The M divide and N output divide
values are latched on the HIGH-to-LOW transition of S_LOAD.
If S_LOAD is held HIGH, data at the S_DATA input is passed
directly to the M divider on each rising edge of S_CLOCK.
The serial mode can be used to program the M and N bits
and test bits T2:T0. The internal registers T2:T0 determine
the state of the TEST output as follows:
NOTE: The functional description that follows describes operation using a 16MHz crystal. Valid PLL loop divider values
for different crystal or input frequencies are defined in the Input Frequency Characteristics, Table 6, NOTE 1.
The ICS84329B-01 features a fully integrated PLL and therefore requires no external components for setting the loop bandwidth. A parallel resonant, fundamental crystal is used as the
input to the on-chip oscillator. The output of the oscillator is
divided by 16 prior to the phase detector. With a 16MHz crystal this provides a 1MHz reference frequency. The VCO of
the PLL operates over a range of 250MHz to 700MHz. The
output of the M divider is also applied to the phase detector.
The phase detector and the M divider force the VCO output
frequency to be M times the reference frequency ÷ 16 by adjusting the VCO control voltage. Note that for some values of M
(either too high or too low), the PLL will not achieve lock. The
output of the VCO is scaled by a divider prior to being sent to
each of the LVPECL output buffers. The divider provides a 50%
output duty cycle.
The programmable features of the ICS84329B-01 support two
input modes to program the M divider and N output divider.
The two input operational modes are parallel and serial. Figure 1 shows the timing diagram for each mode. In parallel mode
the nP_LOAD input is LOW. The data on inputs M0 through
T2
0
0
0
0
1
1
1
T1
0
0
1
1
0
0
1
T0
0
1
0
1
0
1
0
1
1
1
TEST Output
fOUT
Shift Register Out
fOUT
High
fOUT
PLL Reference Xtal ÷ 16
fOUT
fOUT
VCO ÷ M, (non 50% Duty M divider)
fOUT, LVCMOS Output Frequency < 200MHz
fOUT
fOUT
Low
S_CLOCK ÷ M
(non 50% Duty Cycle M divider)
S_CLOCK ÷ N divider
fOUT ÷ 4
fOUT
SERIAL LOADING
S_CLOCK
S_DATA
S_LOAD
T2
t
S
T1
T0
N1
N0
M8
M7
M6
M5
M4
M3
M2
M1
M0
t
H
nP_LOAD
t
S
PARALLEL LOADING
M0:M8, N0:N1
M, N
nP_LOAD
t
S
t
H
S_LOAD
Time
FIGURE 1. PARALLEL & SERIAL LOAD OPERATIONS
84329BM-01
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2
REV. A JUNE 10, 2005
ICS84329B-01
Integrated
Circuit
Systems, Inc.
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
TABLE 1. PIN DESCRIPTIONS
Name
M0, M1, M2, M3,
M4, M5, M6, M7, M8
Type
Input
Pullup
N0, N1
Input
Pullup
VEE
Power
TEST
Output
VCC
Power
nFOUT, FOUT
Output
S_CLOCK
Input
S_DATA
Input
S_LOAD
Input
VCCA
Power
nc
XTAL_IN,
XTAL_OUT
Unused
Description
M divider inputs. Data latched on LOW-to-HIGH transistion of nP_LOAD input.
LVCMOS / LVTTL interface levels.
Determines N output divider value as defined in Table 3C Function Table.
LVCMOS / LVTTL interface levels.
Negative supply pins.
Test output which is used in the serial mode of operation.
LVCMOS / LVTTL interface levels.
Core supply pins.
Differential output for the synthesizer. 3.3V LVPECL interface levels.
Clocks the serial data present at S_DATA input into the shift register
Pulldown
on the rising edge of S_CLOCK. LVCMOS / LVTTL interface levels.
Shift register serial input. Data sampled on the rising edge of S_CLOCK.
Pulldown
LVCMOS / LVTTL interface levels.
Controls transition of data from shift register into the M divider.
Pulldown
LVCMOS / LVTTL interface levels.
Analog supply pin.
No connect.
Cr ystal oscillator interface. XTAL_IN is the input. XTAL_OUT is the output.
Input
Parallel load input. Determines when data present at M8:M0 is loaded into
the M divider, and when data present at N1:N0 sets the N output divider value.
LVCMOS / LVTTL interface levels.
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
nP_LOAD
Input
Pullup
TABLE 2. PIN CHARACTERISTICS
Symbol
Parameter
Test Conditions
Minimum
Typical
Maximum
Units
CIN
Input Capacitance
4
pF
RPULLUP
Input Pullup Resistor
51
kΩ
RPULLDOWN
Input Pulldown Resistor
51
kΩ
84329BM-01
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3
REV. A JUNE 10, 2005
ICS84329B-01
Integrated
Circuit
Systems, Inc.
TABLE 3A. PARALLEL
AND
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
SERIAL MODE FUNCTION TABLE
Inputs
nP_LOAD
M
N
S_LOAD
S_CLOCK
S_DATA
X
X
X
X
X
X
L
Data
Data
X
X
X
↑
Data
Data
L
X
X
H
X
X
L
↑
Data
H
X
X
↑
L
Data
H
X
X
↓
L
Data
H
X
X
L
NOTE: L = LOW
H = HIGH
X = Don't care
↑ = Rising edge transition
↓ = Falling edge transition
X
X
Conditions
Reset. M and N bits are all set HIGH.
Data on M and N inputs passed directly to M divider and
N output divider. TEST mode 000.
Data is latched into input registers and remains loaded
until next LOW transition or until a serial event occurs.
Serial input mode. Shift register is loaded with data on
S_DATA on each rising edge of S_CLOCK.
Contents of the shift register are passed to the M divider
and N output divider.
M divide and N output divide values are latched.
Parallel or serial input do not affect shift registers.
TABLE 3B. PROGRAMMABLE VCO FREQUENCY FUNCTION TABLE
256
128
64
32
16
8
4
2
1
M8
M7
M6
M5
M4
M3
M2
M1
M0
250
0
1
1
1
1
1
0
1
0
251
0
1
1
1
1
1
0
1
1
VCO Frequency
(MHz)
M Divide
250
251
252
252
0
1
1
1
1
1
1
0
0
253
253
0
1
1
1
1
1
1
0
1
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
509
509
1
1
1
1
1
1
1
0
1
510
510
1
1
1
1
1
1
1
1
0
511
511
1
1
1
1
1
1
1
1
1
NOTE 1: These M divide values and the resulting frequencies correspond to a crystal frequency of 16MHz.
TABLE 3C. PROGRAMMABLE OUTPUT DIVIDER FUNCTION TABLE
Inputs
N Divider Value
Output Frequency (MHz)
N1
N0
0
0
1
250
700
0
1
2
125
35 0
1
0
4
62.5
175
1
1
8
31.25
87.5
84329BM-01
Minimum
Maximum
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4
REV. A JUNE 10, 2005
ICS84329B-01
Integrated
Circuit
Systems, Inc.
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC
4.6V
Inputs, VI
-0.5V to VCC + 0.5V
Outputs, IO
Continuous Current
Surge Current
50mA
100mA
Package Thermal Impedance, θJA
For 28 Lead SOIC
For 28 Lead PLCC
46.2°C/W (0 lfpm)
37.8°C/W (0 lfpm)
Storage Temperature, TSTG
-65°C to 150°C
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause permanent damage to the
device. These ratings are stress specifications only. Functional
operation of product at these conditions or any conditions beyond those listed in the DC Characteristics or AC Characteristics is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect product reliability.
TABLE 4A. DC POWER SUPPLY CHARACTERISTICS, VCC = VCCA = 3.3V±5%, TA = 0°C TO 70°C
Symbol
Parameter
Minimum
Typical
Maximum
Units
VCC
Core Supply Voltage
Test Conditions
3.135
3.3
3.465
V
3.135
3.3
VCCA
Analog Supply Voltage
3.465
V
ICC
Power Supply Current
125
mA
ICCA
Analog Supply Current
15
mA
Maximum
Units
2
VCC + 0.3
V
-0.3
0.8
V
VCC = VIN = 3.465V
5
µA
VCC = VIN = 3.465V
15 0
µA
TABLE 4B. LVCMOS / LVTTL DC CHARACTERISTICS, VCC = VCCA = 3.3V±5%, TA = 0°C TO 70°C
Symbol
VIH
VIL
IIH
IIL
VOH
Parameter
Test Conditions
S_LOAD, nP_LOAD,
Input High Voltage
S_DATA, S_CLOCK,
M0:M8, N0:N1
S_LOAD, nP_LOAD,
Input Low Voltage
S_DATA, S_CLOCK,
M0:M8, N0:N1
M0-M8, N0, N1,
nP_LOAD
Input High Current
S_LOAD,
S_DATA, S_CLOCK
M0-M8, N0, N1,
nP_LOAD
Input Low Current
S_LOAD,
S_DATA, S_CLOCK
Output High Voltage; NOTE 1
Minimum Typical
VCC = 3.465V, VIN = 0V
-150
µA
VCC = 3.465V, VIN = 0V
-5
µA
2.6
V
VOL
Output Low Voltage; NOTE 1
NOTE 1: Outputs terminated with 50Ω to VCC/2. See figure "3.3V Output Load Test Circuit" in the
"Parameter Measurement Information" section.
0.5
V
Maximum
Units
TABLE 4C. LVPECL DC CHARACTERISTICS, VCC = VCCA = 3.3V±5%, TA = 0°C TO 70°C
Symbol
Parameter
Test Conditions
Minimum
Typical
VOH
Output High Voltage; NOTE 1
VCC - 1.4
VCC - 0.9
V
V OL
Output Low Voltage; NOTE 1
VCC - 2.0
VCC - 1.7
V
VSWING
Peak-to-Peak Output Voltage Swing
0.6
1.0
V
NOTE 1: Outputs terminated with 50Ω to VCC - 2V.
84329BM-01
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5
REV. A JUNE 10, 2005
ICS84329B-01
Integrated
Circuit
Systems, Inc.
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
TABLE 5. CRYSTAL CHARACTERISTICS
Parameter
Test Conditions
Minimum
Mode of Oscillation
Typical Maximum
Units
Fundamental
25
MHz
Equivalent Series Resistance (ESR)
Frequency
10
50
Ω
Shunt Capacitance
7
pF
Drive Level
1
mW
TABLE 6. INPUT FREQUENCY CHARACTERISTICS, VCC = VCCA = 3.3V±5%, TA = 0°C TO 70°C
Symbol
fIN
Parameter
Input Frequency
Test Conditions
Minimum
XTAL; NOTE 1
Typical
10
Maximum
Units
25
MHz
S_CLOCK
50
MHz
NOTE 1: For the cr ystal frequency range the M value must be set to achieve the minimum or maximum VCO frequency
range of 250MHz or 700MHz. Using the minimum frequency of 10MHz valid values of M are 400 ≤ M ≤ 511.
Using the maximum frequency of 25MHz valid values of M are 160 ≤ M ≤ 448.
TABLE 7. AC CHARACTERISTICS, VCC = VCCA = 3.3V±5%, TA = 0°C TO 70°C
Symbol
Parameter
FOUT
Output Frequency
tjit(per)
Period Jitter, RMS; NOTE 1, 2
Test Conditions
Minimum
Maximum
Units
700
MHz
5.5
ps
fOUT < 65MHz
12
ps
fOUT ≥ 50MHz
35
ps
50
ps
800
ps
fOUT ≥ 65MHz
tjit(cc)
Cycle-to-Cycle Jitter ; NOTE 1, 2
tR / tF
Output Rise/Fall Time
tS
Setup Time
5
tH
Hold Time
5
tL
PLL Lock Time
fOUT < 50MHz
20% to 80%
odc
Output Duty Cycle
See Parameter Measurement Information section.
Characterized using a 16MHz XTAL.
NOTE 1: This parameter is defined in accordance with JEDEC Standard 65
NOTE 2: See Applications section.
84329BM-01
Typical
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6
300
45
ns
ns
50
10
ms
55
%
REV. A JUNE 10, 2005
ICS84329B-01
Integrated
Circuit
Systems, Inc.
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
PARAMETER MEASUREMENT INFORMATION
2V
VCC ,
VCCA
Qx
SCOPE
nFOUT
FOUT
tcycle
➤
LVPECL
➤
n
tcycle n+1
➤
➤
nQx
VEE
t jit(cc) = tcycle n –tcycle n+1
1000 Cycles
-1.3V ± 0.165V
CYCLE-TO-CYCLE JITTER
3.3V OUTPUT LOAD AC TEST CIRCUIT
nFOUT
VOH
FOUT
VREF
t PW
t
VOL
1σ contains 68.26% of all measurements
2σ contains 95.4% of all measurements
3σ contains 99.73% of all measurements
4σ contains 99.99366% of all measurements
6σ contains (100-1.973x10-7)% of all measurements
odc =
PERIOD
t PW
x 100%
t PERIOD
Histogram
Reference Point
Mean Period
(Trigger Edge)
(First edge after trigger)
PERIOD JITTER
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
S_DATA
S_CLOCK
80%
S_LOAD
20%
20%
tR
t HOLD
80%
VSW I N G
Clock
Outputs
t SET-UP
t SET-UP
M0:M8
tF
N0:N1
nP_LOAD
OUTPUT RISE/FALL TIME
84329BM-01
SETUP
AND
HOLD
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7
t HOLD
t SET-UP
REV. A JUNE 10, 2005
ICS84329B-01
Integrated
Circuit
Systems, Inc.
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
APPLICATION INFORMATION
POWER SUPPLY FILTERING TECHNIQUES
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS84329B-01 provides
separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. VCC and V CCA
should be individually connected to the power supply
plane through vias, and bypass capacitors should be
used for each pin. To achieve optimum jitter performance,
power supply isolation is required. Figure 2 illustrates how
a 10Ω resistor along with a 10μF and a .01μF bypass
capacitor should be connected to each VCCA pin.
TERMINATION
FOR
3.3V
VCC
.01μF
10 Ω
.01μF
10μF
VCCA
FIGURE 2. POWER SUPPLY FILTERING
LVPECL OUTPUTS
The clock layout topology shown below is a typical termination for LVPECL outputs. The two different layouts mentioned
are recommended only as guidelines.
drive 50Ω transmission lines. Matched impedance techniques
should be used to maximize operating frequency and minimize
signal distortion. Figures 3A and 3B show two different layouts
which are recommended only as guidelines. Other suitable clock
layouts may exist and it would be recommended that the board
designers simulate to guarantee compatibility across all printed
circuit and clock component process variations.
FOUT and nFOUT are low impedance follower outputs that
generate ECL/LVPECL compatible outputs. Therefore, terminating resistors (DC current path to ground) or current sources
must be used for functionality. These outputs are designed to
3.3V
Zo = 50Ω
125Ω
FOUT
125Ω
FIN
Zo = 50Ω
Zo = 50Ω
FOUT
50Ω
1
RTT =
Z
((VOH + VOL) / (VCC – 2)) – 2 o
Zo = 50Ω
VCC - 2V
RTT
84Ω
FIGURE 3A. LVPECL OUTPUT TERMINATION
84329BM-01
FIN
50Ω
84Ω
FIGURE 3B. LVPECL OUTPUT TERMINATION
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8
REV. A JUNE 10, 2005
Integrated
Circuit
Systems, Inc.
ICS84329B-01
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
14
12
Time (pS)
10
8
6
4
2
0
25
50
75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 450 475 500 525
Output Frequency (MHz)
FIGURE 4A. RMS JITTER VS. fOUT (USING A 16MHZ XTAL)
60
50
Time (pS)
40
30
20
10
0
25
50
75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 450 475 500 525
Output Frequency (MHz)
FIGURE 4B. CYCLE-TO-CYCLE JITTER VS. fOUT (USING A 16MHZ XTAL)
84329BM-01
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9
REV. A JUNE 10, 2005
ICS84329B-01
Integrated
Circuit
Systems, Inc.
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
CRYSTAL INPUT INTERFACE
accuracy suitable for most applications. Additional accuracy can
be achieved by adding two small capacitors C1 and C2 as shown
in Figure 5.
A crystal can be characterized for either series or parallel mode
operation. The ICS84329B-01 has a built-in crystal oscillator
circuit. This interface can accept either a series or parallel crystal
without additional components and generate frequencies with
XTAL_OUT
C1
18p
X1
18pF Parallel Crystal
XTAL_IN
C2
22p
ICS84329B-01
Figure 5. CRYSTAL INPUt INTERFACE
84329BM-01
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10
REV. A JUNE 10, 2005
ICS84329B-01
Integrated
Circuit
Systems, Inc.
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
LAYOUT GUIDELINE
The layout in the actual system will depend on the selected component types, the density of the components, the density of the
traces, and the stack up of the P.C. board.
The schematic of the ICS84329B-01 layout example used in
this layout guideline is shown in Figure 6A. The ICS84329B-01
recommended PCB board layout for this example is shown in
Figure 6B. This layout example is used as a general guideline.
C1
M3
M2
M1
M0
nPLOAD
0.1uF
C3
22p
16MHz,18pF
11
10
9
8
7
6
5
VCC
12
13
14
15
16
17
18
M4
M5
M6
M7
M8
N0
N1
M3
M2
M1
M0
nP_LOAD
VCC
XTALOUT
M4
M5
M6
M7
M8
N2
N1
M [8 :0 ]= 11 001 0000 (40 0)
N[1:0 ] =0 1 (Di vi de b y 2)
XTALIN
nc
nc
VCCA
S_LOAD
S_DATA
S_CLOCK
19
20
21
22
23
24
25
SP = Space (i .e. n ot i ntstal le d)
X1
U1
4
3
2
1
28
27
26
VEE
TEST
VCC
VEE
nFOUT
FOUT
VCC
VCC= 3.3 V
C4
22p
R7
10
VCCA
C11
0.01u
C16
10u
C1
VCC
84329BV_01
VCC
0.1uF
Zo = 50 Ohm
RU10
1K
RU11
SP
Fo ut = 20 0 M Hz
C2
0.1u
Zo = 50 Ohm
nPLoad
N0
RU9
SP
N1
RU8
1K
M8
RU7
1K
M7
RU1
SP
M1
M0
RU0
SP
R2
50
RD0
1K
RD1
1K
RD7
SP
RD8
SP
RD9
1K
RD10
SP
R1
50
RD6
1K
R3
50
FIGURE 6A. SCHEMATIC
84329BM-01
OF
RECOMMENDED LAYOUT
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11
REV. A JUNE 10, 2005
ICS84329B-01
Integrated
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700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
The following component footprints are used in this layout
example:
• The differential 50Ω output traces should have the
same length.
All the resistors and capacitors are size 0603.
• Avoid sharp angles on the clock trace. Sharp angle
turns cause the characteristic impedance to change on
the transmission lines.
POWER
AND
GROUNDING
Place the decoupling capacitors C1, C2 and C3, as close as
possible to the power pins. If space allows, placement of the
decoupling capacitor on the component side is preferred. This
can reduce unwanted inductance between the decoupling capacitor and the power pin caused by the via.
• Keep the clock traces on the same layer. Whenever possible, avoid placing vias on the clock traces. Placement
of vias on the traces can affect the trace characteristic
impedance and hence degrade signal integrity.
Maximize the power and ground pad sizes and number of vias
capacitors. This can reduce the inductance between the power
and ground planes and the component power and ground pins.
• To prevent cross talk, avoid routing other signal traces in
parallel with the clock traces. If running parallel traces is
unavoidable, allow a separation of at least three trace
widths between the differential clock trace and the other
signal trace.
The RC filter consisting of R7, C11, and C16 should be placed
as close to the VCCA pin as possible.
• Make sure no other signal traces are routed between the
clock trace pair.
CLOCK TRACES
• The matching termination resistors should be located as
close to the receiver input pins as possible.
AND
TERMINATION
Poor signal integrity can degrade the system performance or
cause system failure. In synchronous high-speed digital systems,
the clock signal is less tolerant to poor signal integrity than other
signals. Any ringing on the rising or falling edge or excessive ring
back can cause system failure. The shape of the trace and the
trace delay might be restricted by the available space on the board
and the component location. While routing the traces, the clock
signal traces should be routed first and should be locked prior to
routing other signal traces.
CRYSTAL
The crystal X1 should be located as close as possible to the pins
4 (XTAL_IN) and 5 (XTAL_OUT). The trace length between the
X1 and U1 should be kept to a minimum to avoid unwanted parasitic inductance and capacitance. Other signal traces should not
be routed near the crystal traces.
X1
C3
U1
GND
VCC
PIN 2
C11
C16
PIN 1
VCCA
VCCA
R7
VIA
Signals
Traces
C1
C2
50 Ohm
Traces
FIGURE 6B. PCB BOARD LAYOUT
84329BM-01
FOR
ICS84329B-01
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REV. A JUNE 10, 2005
ICS84329B-01
Integrated
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700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS84329B-01.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS84329B-01 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for VCC = 3.3V + 5% = 3.465V, which gives worst case results.
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
•
•
Power (core)MAX = VCC_MAX * IEE_MAX = 3.465V * 140mA = 485mW
Power (outputs)MAX = 30mW/Loaded Output pair
Total Power_MAX (3.465V, with all outputs switching) = 485mW + 30mW = 515mW
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of the
device. The maximum recommended junction temperature for HiPerClockSTM devices is 125°C.
The equation for Tj is as follows: Tj = θJA * Pd_total + TA
Tj = Junction Temperature
θJA = Junction-to-Ambient Thermal Resistance
Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)
TA = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance θJA must be used. Assuming a
moderate air flow of 200 linear feet per minute and a multi-layer board, the appropriate value is 31.1°C/W per Table 8A below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
70°C + 0.515W * 31.1°C/W = 86°C. This is well below the limit of 125°C.
This calculation is only an example. Tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow,
and the type of board (single layer or multi-layer).
TABLE 8A. THERMAL RESISTANCE θJA
FOR
28-PIN PLCC, FORCED CONVECTION
θJA by Velocity (Linear Feet per Minute)
Multi-Layer PCB, JEDEC Standard Test Boards
0
200
500
37.8°C/W
31.1°C/W
28.3°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
TABLE 8B. THERMAL RESISTANCE θJA
FOR
28-PIN SOIC, FORCED CONVECTION
θJA by Velocity (Linear Feet per Minute)
Single-Layer PCB, JEDEC Standard Test Boards
Multi-Layer PCB, JEDEC Standard Test Boards
0
200
500
76.2°C/W
46.2°C/W
60.8°C/W
39.7°C/W
53.2°C/W
36.8°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
84329BM-01
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REV. A JUNE 10, 2005
ICS84329B-01
Integrated
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700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
3. Calculations and Equations.
The purpose of this section is to derive the power dissipated into the load.
LVPECL output driver circuit and termination are shown in the Figure 7.
VCC
Q1
VOUT
RL
50
VCC - 2V
FIGURE 7. LVPECL DRIVER CIRCUIT
AND
TERMINATION
To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination
voltage of V - 2V.
CC
•
For logic high, VOUT = V
OH_MAX
(V
CC_MAX
•
-V
OH_MAX
OL_MAX
CC_MAX
-V
OL_MAX
CC_MAX
– 0.9V
) = 0.9V
For logic low, VOUT = V
(V
=V
=V
CC_MAX
– 1.7V
) = 1.7V
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = [(V
OH_MAX
– (V
CC_MAX
- 2V))/R ] * (V
CC_MAX
L
-V
OH_MAX
) = [(2V - (V
CC_MAX
-V
OH_MAX
))/R ] * (V
CC_MAX
L
-V
OH_MAX
)=
[(2V - 0.9V)/50Ω] * 0.9V = 19.8mW
Pd_L = [(V
OL_MAX
– (V
CC_MAX
- 2V))/R ] * (V
L
CC_MAX
-V
OL_MAX
) = [(2V - (V
CC_MAX
-V
OL_MAX
))/R ] * (V
L
CC_MAX
-V
OL_MAX
)=
[(2V - 1.7V)/50Ω] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW
84329BM-01
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REV. A JUNE 10, 2005
ICS84329B-01
Integrated
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Systems, Inc.
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
RELIABILITY INFORMATION
TABLE 9A. θJAVS. AIR FLOW SOIC TABLE
θJA by Velocity (Linear Feet per Minute)
Single-Layer PCB, JEDEC Standard Test Boards
Multi-Layer PCB, JEDEC Standard Test Boards
0
200
500
76.2°C/W
46.2°C/W
60.8°C/W
39.7°C/W
53.2°C/W
36.8°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
TABLE 9B. θJAVS. AIR FLOW PLCC TABLE
θJA by Velocity (Linear Feet per Minute)
Multi-Layer PCB, JEDEC Standard Test Boards
0
200
500
37.8°C/W
31.1°C/W
28.3°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
TRANSISTOR COUNT
The transistor count for ICS84329B-01 is: 4408
Pin compatible with the SY89429
84329BM-01
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15
REV. A JUNE 10, 2005
ICS84329B-01
Integrated
Circuit
Systems, Inc.
PACKAGE OUTLINE - M SUFFIX
FOR
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
28 LEAD SOIC
TABLE 10A. PACKAGE DIMENSIONS
SYMBOL
Millimeters
MINIMUM
N
A
MAXIMUM
28
--
2.65
A1
0.10
--
A2
2.05
2.55
B
0.33
0.51
C
0.18
0.32
D
17.70
18.40
E
7.40
e
7.60
1.27 BASIC
H
10.00
10.65
h
0.25
0.75
L
0.40
1.27
α
0°
8°
Reference Document: JEDEC Publication 95, MS-013, MO-119
84329BM-01
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16
REV. A JUNE 10, 2005
ICS84329B-01
Integrated
Circuit
Systems, Inc.
PACKAGE OUTLINE - V SUFFIX
FOR
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
28 LEAD PLCC
TABLE 10B. PACKAGE DIMENSIONS
JEDEC VARIATION
ALL DIMENSIONS IN MILLIMETERS
SYMBOL
MINIMUM
MAXIMUM
28
N
A
4.19
4.57
A1
2.29
3.05
A2
1.57
2.11
b
0.33
0.53
c
0.19
0.32
D
12.32
12.57
D1
11.43
11.58
D2
4.85
5.56
E
12.32
12.57
E1
11.43
11.58
E2
4.85
5.56
Reference Document: JEDEC Publication 95, MS-018
84329BM-01
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17
REV. A JUNE 10, 2005
ICS84329B-01
Integrated
Circuit
Systems, Inc.
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
TABLE 11. ORDERING INFORMATION
Part/Order Number
Marking
Package
Count
Temperature
ICS84329BM-01
ICS84329BM-01
28 Lead SOIC
Tube
0°C to 70°C
ICS84329BM-01T
ICS84329BM-01
28 Lead SOIC
1000 Tape & Reel
0°C to 70°C
ICS84329BM-01LF
ICS84329BM-01LF
28 Lead "Lead-Free" SOIC
Tube
0°C to 70°C
ICS84329BM-01LFT
ICS84329BM-01LF
28 Lead "Lead-Free" SOIC
1000 Tape & Reel
0°C to 70°C
ICS84329BV-01
ICS84329BV-01
28 Lead PLCC
Tube
0°C to 70°C
ICS84329BV-01T
ICS84329BV-01
28 Lead PLCC
500 Tape & Reel
0°C to 70°C
NOTE: Par ts that are ordered with an "LF" suffix to the par t number are the Pb-Free configuration and are RoHS compliant.
The aforementioned trademark, HiPerClockS™ is a trademark of Integrated Circuit Systems, Inc. or its subsidiaries in the United States and/or other countries.
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (ICS) assumes no responsibility for either its use
or for infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use
in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are
not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS
product for use in life support devices or critical medical instruments.
84329BM-01
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18
REV. A JUNE 10, 2005
Integrated
Circuit
Systems, Inc.
ICS84329B-01
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
REVISION HISTORY SHEET
Rev
A
A
A
84329BM-01
Table
T3A
Page
2
18
1
2
4
T5
T11
6
18
T11
1
Description of Change
Paragraph 2 changed series resonant cr ystal to parallel resonant cr ystal.
Ordering Information Table - added "ICS" to the marking.
Features section - added Lead-Free bullet.
Updated Parallel & Serial Load Operations Diagram.
Parallel & Serial Mode Function Table - corrected S_LOAD column 3rd roll
from X to L.
Cr ystal Characteristics Table - added Drive Level.
Ordering Information Table - added Lead-Free par t number and note.
Features Section - corrected Output frequency range from 25MHz to
31.25MHz.
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19
Date
11/1/04
5/23/05
6/10/05
REV. A JUNE 10, 2005
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