ABE0110
Low EMI Spread Spectrum Multiplier IC
FEATURES
•
•
•
•
•
•
•
•
Spread Spectrum Clock Generator/Multiplier with
output selectable from 1x to 8x.
13MHz to 240MHz output with output enable.
13MHz to 30 MHz reference input frequency
accepted from crystal or external clock signal.
Reduced EMI from Spread Spectrum Modulation,
with selectable modulation amplitude for Center
Spread, Down Spread or Asymmetric Spread.
TTL/CMOS compatible outputs.
3.3V Operating Voltage.
150 ps maximum cycle-to-cycle jitter.
Available in 16-Pin 150mil SSOP
PACKAGE PIN CONFIGURATION
XIN/FIN
XOUT/SD0*^
M2^
M1^
M0^
SC0^
SC1^
SC2^
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GND
AVDD
REF/SD1*^
VDD
SC3^
OE^
FOUT
GND
ABE0110
DESCRIPTION
The ABE0110 is a low EMI Clock Generator and
Multiplier for high-speed digital systems. It uses
Spread Spectrum Technology (SST) and permits
different levels of EMI reduction by selecting the
amplitude of the applied SST. The SST feature can
be turned off. An output enable input is also used.
The chip operates with input frequencies ranging from
13 to 30 MHz and provides 1x to 8x at its output.
XIN/FIN = 10 ~ 30 MHz
Note:
^: Internal pull-up resistor (120kΩ for SD0, 30 kΩ for SC0-
SC2, SD1, M0-M2 and OE). The internal pull-up resistor
results in a default high value when no pull-down resistor is
connected to this pin.
*: SD0 and SD1 are latched upon power-up.
OUTPUT CLOCK (FOUT) SELECTION
BLOCK DIAGRAM
XIN
XOUT
M(0:2)
SD(0:1)
SC(0:3)
OE
XTAL
OSC
PLL
SST
Control
Logic
M2
0
0
0
0
1
1
1
1
M1
0
0
1
1
0
0
1
1
M0
0
1
0
1
0
1
0
1
FOUT
FIN/XIN
(MHz)
13 ~ 28
13 ~ 28
14 ~ 30
13 ~ 28
20 ~ 30
17 ~ 30
15 ~ 30
13 ~ 28
Multiplier
X1
X2
X3
X4
X5
X6
X7
X8
FOUT
(MHz)
13 ~ 28
26 ~ 56
42 ~ 90
52 ~ 112
100 ~ 150
102 ~ 180
105 ~ 210
104 ~ 224
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001
www.Abracon.com
03/21/05 Page 1
ABE0110
Low EMI Spread Spectrum Multiplier IC
SPREAD SPECTRUM SELECTION TABLE
SD1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
1
1
0
1
0
1
1
1
0
1
0
1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
SD0
1
1
1
1
0
1
0
1
0
1
0
1
0
1
1
0
1
1
1
0
1
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
SC3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
SC2
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
SC1
0
0
1
1
1
0
0
0
0
1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
SC0
0
1
0
1
1
0
0
1
1
0
0
1
1
1
0
0
0
1
1
1
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Modulation Modulation
Magnitude Frequency
0.250%
0.500%
0.750%
1.000%
1.250%
1.500%
1.750%
2.000%
C
C
C
C
D
C
A
C
A
C
A
C
A
D
C
A
A
C
A
A
C
A
A
C
D
A
A
C
A
A
A
C
A
A
A
C
A
A
A
Modulation Type
± 0.125%
± 0.25%
± 0.375%
± 0.50%
-1.00%
± 0.625%
+0.125 ~ -1.125%
± 0.75%
+0.25 ~ -1.25%
± 0.875%
+0.375 ~ -1.375%
± 1.00%
+0.50 ~ -1.5%
-2.00%
± 1.125%
+0.625 ~ -1.625%
+0.125 ~ -2.125%
± 1.25%
+0.25 ~ -2.25%
+0.75 ~ -1.75%
± 1.375%
+0.875 ~ -1.875%
+0.375 ~ -2.375%
± 1.50%
-3.00%
+1.00 ~ -2.00%
+0.50 ~ -2.50%
± 1.625%
+1.125 ~ -2.125%
+0.625 ~ -2.625%
+0.125 ~ -3.125%
± 1.75%
+1.25 ~ -2.25%
+0.75 ~ -2.75%
+0.25 ~ -3.25%
± 1.875%
+1.37 ~ -2.375%
+0.875 ~ -2.875%
+0.375 ~ -3.375%
SST turned off
SST turned off
SST turned off
SST turned off
2.250%
2.500%
2.750%
Fin / 512
3.000%
3.250%
3.500%
3.750%
0.00 %
Notes:
C: Center Spread. A: Asymmetric Spread. D: Down Spread.
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001
www.Abracon.com
03/21/05 Page 2
ABE0110
Low EMI Spread Spectrum Multiplier IC
PIN/PAD DESCRIPTIONS
Name
XIN/FIN
XOUT/SD0
M2
M1
M0
SC0
SC1
SC2
SC3
FOUT
OE
VDD
REF/SD1
AVDD
GNDOSC
GNDBUF
GND
Pin #
1
2
3
4
5
6
7
8
12
10
11
13
14
15
N/A
N/A
9 and 16
Pad #
22
23
28
29
30
34
35
1
12
8
10
13,14,15
16
17,18,19
25
7
4,5,6,20,21
Type
I
B
I
I
I
I
I
I
I
O
I
P
B
P
P
P
P
Description
Crystal input to be connected to fundamental parallel mode crystal.
(C
L
=20pF) or clock input.
At power-up, this pin is acts as input pin to select the modulation
rate and is latched in. After the input sampling, it is used as crystal
output connector. 120kΩ internal pull up resistor.
Digital control input to select output frequency. 30kΩ internal pull-
up.
Digital control input to select output frequency. 30kΩ internal pull-
up.
Digital control input to select output frequency. 30kΩ internal pull-
up.
Digital control input to select spread spectrum modulation.
30kΩ internal pull-up.
Digital control input to select spread spectrum modulation.
30kΩ internal pull-up.
Digital control input to select spread spectrum modulation.
30kΩ internal pull-up.
Digital control input to select spread spectrum modulation.
30kΩ internal pull-up.
Modulated Clock Frequency Output. The frequency before
modulation is synthesized by multiplying the input frequency by 1X
to 8X, depending on SD(0:1) and SC(0:3).
Output Enable. When low, Tri-states all outputs.
30kΩ internal pull-up.
3.3V Power Supply.
At power-up, this pin acts as input pin to select the modulation rate
and is latched in. After the input sampling, this pin provides a
buffered Reference Clock Output of the same frequency as the
crystal or clock input. 30kΩ internal pull-up.
3.3V Analog power supply.
Ground for Oscillator circuitry.
Ground for output buffer circuitry.
Ground.
Notes: B – bi-directional pin; I – input pin; P – power supply/ground pin.
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001
www.Abracon.com
03/21/05 Page 3
ABE0110
Low EMI Spread Spectrum Multiplier IC
FUNCTIONAL DESCRIPTION
Selectable spread spectrum and modulation rates
The ABE0110 provides selectable multiplier factors (1x to 8X), selectable spread spectrum modulation, as well as
selectable modulation rate. Selection is made by connecting specific input pins to a logical “zero” or “one”. Pins 6
(SC0), 7 (SC1), 8 (SC2) and 12 (SC3) are used as inputs to select the spread spectrum modulation as shown on
the spread spectrum selection table (page 2). Pins 3 (M2), 4 (M1), 5 (M0) are used as inputs to select the output
frequency as shown on the output clock selection table (page 1). Pin 11 is the output enable pin, that tri-states all
outputs when low (logical “zero”).
In order to reduce the number of pins on the chip, the ABE0110 uses pin 2 and 14 (XOUT/SD0 and REF/SD1) as a
bi-directional pin. The pins serve as modulation rate selector inputs (SD0 and SD1) upon power-up (see
modulation rate table on page 1), and as XOUT crystal connection (pin 2), and REF output signal (pin 14) as soon
as the inputs have been latched.
Connecting a selection pin to a logical “one”
All selection pins have an internal pull-up resistor (30kΩ for pins 3, 4, 5, 6, 7, 8, 11, 12, 14 and 120kΩ for pin 2).
This internal pull-up resistor will pull the input value to a logical “one” (pull-up) by default, i.e. when no resistive
load is connected between the pin and GND. No external pull-up resistor is therefore required for connecting a
logical “one” upon power-up.
Connecting a selection pin to a logical “zero”
For an input only pin, i.e. all input pins except XOUT/SD0 (pin 2) and REF/SD1 (pin 14), the pin simply needs to be
grounded to pull the input down to a logical “zero”. Connecting the bi-directional pins (SD0 and SD1) to a logical
“zero” will however require the use of an external loading resistor between the pin and GND that has to be
sufficiently small (compared to the internal pull-up resistor) so that the pin voltage be pulled below 0.8V (logical
“zero”). In order to avoid loading effects when the pin serves as output, the value of the external pull-down resistor
should however be kept as large as possible. In general, it is recommended to use an external resistor of around
Rup/4 (e.g. 27kΩ for pin 2 and 4.7kΩ for pin 14, see Application Diagram).
APPLICATION DIAGRAM FOR OUTPUT AND MODULATION SELECTION
Internal to chip
VDD
External Circuitry
R
up
Power Up
Reset
R
RB
XIN
EN
Bi-directional pin
Clock Load
SD0 or
SC0~SC2
Latch
R
up
/4
Jumper
options
NOTE:
Rup=120kΩ for SD0 (Pin2); and Rup=30kΩ for SD1(Pin 14). R starts from 1 to 0 while RB starts from 0 to 1.
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001
www.Abracon.com
03/21/05 Page 4
ABE0110
Low EMI Spread Spectrum Multiplier IC
ELECTRICAL SPECIFICATIONS
1. Absolute Maximum Ratings
PARAMETERS
Supply Voltage
Input Voltage, dc
Output Voltage, dc
Storage Temperature
Ambient Operating Temperature*
Junction Temperature
Lead Temperature (soldering, 10s)
ESD Protection, Human Body Model
SYMBOL
V
DD
V
I
V
O
T
S
T
A
T
J
MIN.
-0.5
-0.5
-65
-40
MAX.
4.6
V
DD
+0.5
V
DD
+0.5
150
85
125
260
2
UNITS
V
V
V
°C
°C
°C
°C
kV
Exposure of the device under conditions beyond the limits specified by Maximum Ratings for extended periods may cause permanent damage to the
device and affect product reliability. These conditions represent a stress rating only, and functional operations of the device at these or any other
conditions above the operational limits noted in this specification is not implied.
*
Note:
Operating Temperature is guaranteed by design for all parts (COMMERCIAL and INDUSTRIAL), but tested for COMMERCIAL grade only.
2. DC/AC Specifications
PARAMETERS
Supply Voltage
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
Output High Voltage
Output Low Voltage
Input Frequency
Maximum interruption of F
IN
Load Capacitance
Pull-up Resistor
Pull-up Resistor
Short Circuit Current
3.3V Dynamic Supply Current
C
L
R
up
R
up
I
sc
I
CC
SYMBOL
V
DD
V
IH
V
IL
I
IH
I
IL
V
OH
V
OL
F
XIN
F
IN
CONDITIONS
MIN.
2.97
0.7* V
DD
TYP.
MAX.
3.63
0.3* V
DD
100
100
UNITS
V
V
V
µA
µA
I
OH
=5mA, V
DD
=3.3V
I
OL
=6mA, V
DD
=3.3V
When using a crystal
When using reference clock
When using reference clock
Between Pin XIN and
XOUT*
PIN 2
PIN 3,4,5,6,7,8,11,12
No Load
2.4
15
15
18
120
30
25
20
0.4
30
30
100
MHz
MHz
µs
pF
kΩ
kΩ
mA
mA
*Note:
Pin XIN and XOUT each has a 36pF capacitance. When used with a XTAL, the two capacitors combined load the crystal with 18pF. If driving XIN
with a reference clock signal, the load capacitance will be 36pF (typical).
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001
www.Abracon.com
03/21/05 Page 5
