500MHz, Crystal-to-3.3V, 2.5V Differential
LVPECL Frequeny Synthesizer
G
ENERAL
D
ESCRIPTION
T h e 8 4 3 0 I - 6 1 i s a g e n e ra l p u r p o s e, d u a l o u t p u t
Crystal-to-3.3V, 2.5V Differential LVPECL High Frequency
Synthesizer . The 8430I-61 has a selectable TEST_CLK
or crystal inputs. The VCO operates at a frequency range
of 250MHz to 500MHz. The VCO frequency is programmed
in steps equal to the value of the input reference or
crystal frequency. The VCO and output frequency can be
programmed using the serial or parallel interfaces to the
configuration logic. Frequency steps as small as 1MHz can be
achieved using a 16MHz crystal or TEST_CLK.
8430I-61
DATA SHEET
F
EATURES
•
Dual differential 3.3V or 2.5V LVPECL outputs
•
Selectable crystal oscillator interface
or LVCMOS/LVTTL TEST_CLK
•
Output frequency range: 20.83MHz to 500MHz
•
Crystal input frequency range: 14MHz to 27MHz
•
VCO range: 250MHz to 500MHz
•
Parallel or serial interface for programming counter
and output dividers
•
RMS period jitter: 6ps (maximum)
•
Cycle-to-cycle jitter: 30ps (maximum)
•
Supply voltage modes:
V
CC
/V
CCA
/V
CCO
3.3/3.3/3.3
3.3/3.3/2.5
•
-40°C to 85°C ambient operating temperature
•
Available in lead-free RoHS compliant package
B
LOCK
D
IAGRAM
P
IN
A
SSIGNMENT
VCO_SEL
nP_LOAD
XTAL_IN
M4
32 31 30 29 28 27 26 25
M5
M6
M7
M8
N0
N1
N2
V
EE
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
TEST
V
CC
FOUT1
nFOUT1
V
CCO
FOUT0
nFOUT0
V
EE
24
23
22
XTAL_OUT
TEST_CLK
XTAL_SEL
V
CCA
S_LOAD
S_DATA
S_CLOCK
MR
32-Lead LQFP
7mm x 7mm x 1.4mm package body
Y Package
Top View
M3
ICS8430I-61
M2
M1
M0
21
20
19
18
17
8430I-61 REVISION D 10/15/15
1
©2015 Integrated Device Technology, Inc.
8430I-61 DATA SHEET
F
UNCTIONAL
D
ESCRIPTION
NOTE: The functional description that follows describes oper-
ation using a 16MHz crystal. Valid PLL loop divider values for
different crystal or input frequencies are defined in the Input
Frequency Characteristics, Table 5, NOTE 1.
The 8430I-61 features a fully integrated PLL and therefore re-
quires 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 500MHz. 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 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 8430I-61 support two input
modes and 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 initially LOW. The data on inputs M0 through
M8 and N0 through N2 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. As a result, the M and N bits can be hard-wired to set
the M divider and N output divider to a specific default state that
will automatically occur during power-up. The TEST output is
LOW 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 for a
16MHz reference are defined as 250
≤
M
≤
500. 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 and N output 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 and N output divider on each ris-
ing edge of S_CLOCK. The serial mode can be used to program
the M and N bits and test bits T1 and T0. The internal registers
T0 and T1 determine the state of the TEST output as follows:
T1
0
0
1
1
T0
0
1
0
1
TEST Output
LOW
S_Data, Shift Register Input
Output of M divider
CMOS Fout
F
IGURE
1. P
ARALLEL
& S
ERIAL
L
OAD
O
PERATIONS
500MHZ, CRYSTAL-TO-3.3V, 2.5V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
2
REVISION D 10/15/15
8430I-61 DATA SHEET
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
28, 29, 30
31, 32, 1, 2
3, 4
5, 7
6
8, 16
9
10
11, 12
13
14, 15
Name
M0, M1, M2
M3, M4, M5, M6
M7, M8
N0, N2
N1
V
EE
TEST
V
CC
FOUT1, nFOUT1
V
CCO
FOUT0, nFOUT0
Input
Input
Input
Input
Power
Output
Power
Output
Power
Output
Type
Description
Pulldown M divider inputs. Data latched on LOW-to-HIGH transition of nP_
LOAD input. LVCMOS / LVTTL interface levels.
Pullup
Pulldown Determines output divider value as defined in Table 3C,
Pullup Function Table. LVCMOS / LVTTL interface levels.
Negative supply pins.
Test output which is ACTIVE in the serial mode of operation.
Output driven LOW in parallel mode. LVCMOS interface levels.
Core supply pin.
Differential output for the synthesizer. LVPECL interface levels.
Output supply pin for LVPECL outputs.
Differential output for the synthesizer. LVPECL interface levels.
Active High Master Reset. When logic HIGH, the internal dividers are
reset causing the true outputs FOUTx to go low and the inverted out-
puts nFOUTx to go high. When Logic LOW, the internal dividers and
the outputs are enabled. Assertion of MR does not affect loaded M, N,
and T values. LVCMOS / LVTTL interface levels.
Clocks in serial data present at S_DATA input into the shift register on
the rising edge of S_CLOCK. LVCMOS / LVTTL interface levels.
Shift register serial input. Data sampled on the rising edge
of S_CLOCK. LVCMOS / LVTTL interface levels.
Controls transition of data from shift register into the dividers. LVC-
MOS / LVTTL interface levels.
Analog supply pin.
Pullup
Selects between crystal oscillator or test inputs as the PLL reference
source. Selects XTAL inputs when HIGH. Selects TEST_CLK when
LOW. LVCMOS / LVTTL interface levels.
17
MR
Input
Pulldown
18
19
20
21
22
23
24,
25
26
27
S_CLOCK
S_DATA
S_LOAD
V
CCA
XTAL_SEL
TEST_CLK
XTAL_OUT, XTAL_
IN
nP_LOAD
VCO_SEL
Input
Input
Input
Power
Input
Input
Input
Input
Input
Pulldown
Pulldown
Pulldown
Pulldown Test clock input. LVCMOS / LVTTL interface levels.
Crystal oscillator interface. XTAL_IN is the input.
XTAL_OUT is the output.
Parallel load input. Determines when data present at M8:M0 is loaded
Pulldown into M divider, and when data present at N2:N0 sets the
N output divider value. LVCMOS / LVTTL interface levels.
Determines whether synthesizer is in PLL or bypass mode. LVCMOS
Pullup
/ LVTTL interface levels.
NOTE:
Pullup
and
Pulldown
refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
T
ABLE
2. P
IN
C
HARACTERISTICS
Symbol
C
IN
R
PULLUP
R
PULLDOWN
Parameter
Input Capacitance
Input Pullup Resistor
Input Pulldown Resistor
Test Conditions
Minimum
Typical
4
51
51
Maximum
Units
pF
kΩ
kΩ
REVISION D 10/15/15
3
500MHZ, CRYSTAL-TO-3.3V, 2.5V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
8430I-61 DATA SHEET
T
ABLE
3A. P
ARALLEL AND
S
ERIAL
M
ODE
F
UNCTION
T
ABLE
Inputs
MR
H
L
L
L
L
L
L
L
nP_LOAD
X
L
↑
H
H
H
H
H
M
X
Data
Data
X
X
X
X
X
N
X
Data
Data
X
X
X
X
X
S_LOAD
X
X
L
L
↑
↓
L
H
S_CLOCK
X
X
X
↑
L
L
X
↑
S_DATA
X
X
X
Data
Data
Data
X
Data
Reset. Forces outputs LOW.
Data on M and N inputs passed directly to the M divider
and N output divider. TEST output forced LOW.
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 divider and N output divider values are latched.
Parallel or serial input do not affect shift registers.
S_DATA passed directly to M divider as it is clocked.
Conditions
NOTE: L = LOW
H = HIGH
X = Don’t care
↑
= Rising edge transition
↓
= Falling edge transition
T
ABLE
3B. P
ROGRAMMABLE
VCO F
REQUENCY
F
UNCTION
T
ABLE
(NOTE 1)
VCO Frequency
(MHz)
250
251
252
253
•
•
498
499
500
M Divide
250
251
252
253
•
•
498
499
500
256
M8
0
0
0
0
•
•
1
1
1
128
M7
1
1
1
1
•
•
1
1
1
64
M6
1
1
1
1
•
•
1
1
1
32
M5
1
1
1
1
•
•
1
1
1
16
M4
1
1
1
1
•
•
1
1
1
8
M3
1
1
1
1
•
•
0
0
0
4
M2
0
0
1
1
•
•
0
0
1
2
M1
1
1
0
0
•
•
1
1
0
1
M0
0
1
0
1
•
•
0
1
0
NOTE 1: These M divide values and the resulting frequencies correspond to a TEST_CLK or crystal frequency of 16MHz.
T
ABLE
3C. P
ROGRAMMABLE
O
UTPUT
D
IVIDER
F
UNCTION
T
ABLE
Inputs
N2
0
0
0
0
1
1
1
1
N1
0
0
1
1
0
0
1
1
N0
0
1
0
1
0
1
0
1
4
N Divider Value
1
1.5
2
3
4
6
8
12
Output Frequency (MHz)
Minimum
250
166.66
125
83.33
62.5
41.66
31.25
20.83
Maximum
500
333.33
250
166.66
125
83.33
62.5
41.66
REVISION D 10/15/15
500MHZ, CRYSTAL-TO-3.3V, 2.5V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
8430I-61 DATA SHEET
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
CC
Inputs, V
I
Outputs, I
O
Continuous Current
Surge Current
Package Thermal Impedance,
θ
JA
Storage Temperature, T
STG
4.6V
-0.5V to V
CC
+ 0.5V
50mA
100mA
47.9°C/W (0 lfpm)
-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 Charac-
teristics
is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect product reliability.
T
ABLE
4A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= V
CCA
= 3.3V±5%, V
CCO
= 3.3V±5%
OR
2.5V±5%, T
A
= -40°C
TO
85°C
Symbol
V
CC
V
CCA
V
CCO
I
EE
I
CCA
Parameter
Core Supply Voltage
Analog Supply Voltage
Output Supply Voltage
Power Supply Current
Analog Supply Current
Test Conditions
Minimum
3.135
3.135
3.135
2.375
Typical
3.3
3.3
3.3
2.5
Maximum
3.465
V
CC
3.465
2.625
155
15
Units
V
V
V
V
mA
mA
T
ABLE
4B. LVCMOS / LVTTL DC C
HARACTERISTICS
,
V
CC
= V
CCA
= 3.3V±5%, V
CCO
= 3.3V±5%
OR
2.5V±5%, T
A
= -40°C
TO
85°C
Symbol
Parameter
M0:M8, N0:N2, MR, S_LOAD,
S_DATA, S_CLOCK, nP_
LOAD, VCO_SEL, XTAL_SEL
TEST_CLK
M0:M8, N0:N2, MR, S_LOAD,
S_DATA, S_CLOCK, nP_
LOAD, VCO_SEL, XTAL_SEL
TEST_CLK
Input
High Current
M0-M4, M6-M8, N0, N1, MR,
S_CLOCK, TEST_CLK, S_
DATA, S_LOAD, nP_LOAD
M5, XTAL_SEL, VCO_SEL
M0-M4, M6-M8, N0, N1, MR,
S_CLOCK, TEST_CLK, S_
DATA, S_LOAD, nP_LOAD
M5, XTAL_SEL, VCO_SEL
Output High
TEST; NOTE 1
Voltage
Output
TEST; NOTE 1
V
OL
Low Voltage
NOTE 1: Outputs terminated with 50Ω to V
CC
/2.
V
OH
REVISION D 10/15/15
5
V
CC
= V
IN
= 3.465V
V
CC
= V
IN
= 3.465V
V
CC
= 3.465V,
V
IN
= 0V
V
CC
= 3.465V,
V
IN
= 0V
V
CC
= 3.465V
-5
Test Conditions
Minimum Typical
2
2
-0.3
-0.3
Maximum Units
V
CC
+ 0.3
V
CC
+ 0.3
0.8
1.3
150
5
V
V
V
V
µA
µA
µA
V
IH
Input
High Voltage
V
IL
Input
Low Voltage
I
IH
I
IL
Input
Low Current
-150
2.6
0.5
µA
V
V
500MHZ, CRYSTAL-TO-3.3V, 2.5V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
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