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ABE0110 Datasheet(PDF) 4 Page - Abracon Corporation

Part No. ABE0110
Description  Low EMI Spread Spectrum Multiplier IC
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Manufacturer  ABRACON [Abracon Corporation]
Direct Link  https://abracon.com
Logo ABRACON - Abracon Corporation

ABE0110 Datasheet(HTML) 4 Page - Abracon Corporation

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ABE0110
Low EMI Spread Spectrum Multiplier IC
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 4
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 (30k
Ω 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. 27k
Ω for pin 2 and 4.7kΩ for pin 14, see Application Diagram).
APPLICATION DIAGRAM FOR OUTPUT AND MODULATION SELECTION
Latch
Power Up
Reset
Jumper
options
R
up/4
Clock Load
SD0 or
SC0~SC2
XIN
EN
VDD
R
up
Bi-directional pin
R
RB
NOTE: Rup=120k
Ω for SD0 (Pin2); and Rup=30kΩ for SD1(Pin 14). R starts from 1 to 0 while RB starts from 0 to 1.
Internal to chip
External Circuitry


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