(ABX0235 - ABX0239) Low Phase Noise Multiplier XO - Abracon Corporation
Description
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ABX0235/37/38/39
750kHz – 800MHz Low Phase Noise Multiplier XO
Universal Low Phase Noise IC’s
FEATURES
• • Selectable 750kHz to 800MHz range.
Low phase noise output (@ 10kHz frequency offset, -140dBc/Hz for 19.
44MHz, -127dBc/Hz for 106.
25MHz, -125dBc/Hz for 155.
52MHz, 110dBc/Hz for 622.
08MHz).
CMOS (ABX0237), PECL (ABX0235 and ABX0238) or LVDS (ABX0239) output.
12 to 25MHz crystal input.
No external load capacitor required.
Output Enable selector.
Selectable 1/16 to 32x frequency multiplier.
3.
3V operation.
Available in 16-Pin (TSSOP or 3x3mm QFN).
PIN CONFIGURATION (Top View)
VDD XIN XOUT SEL3^ SEL2^ OE GND GND 1 2 16 15 SEL0^ SEL1^ GND CLKC VDD CLKT GND GND
ABX023x
• • • • • • •
3 4 5 6 7 8
14 13 12 11 10 9
DESCRIPTION
The ABX0235 (PECL with inverted OE), ABX0237 (CMOS), ABX0238 (PECL), and ABX0239 (LVDS) are high performance and low phase noise XO IC chips.
They provide phase noise performance as low as –125dBc at 1kHz offset (at 155MHz) and a typical RMS jitter of 4pS RMS ( at 155MHz ).
They accept fundamental parallel resonant mode crystals from 12 to 25MHz.
XIN
SEL0^ / VDD*
10
VDD / GND*
XOUT SEL3^ SEL2^ OE
13 14 15 16
12
11
SEL1^
9
8 7 6 5
GND CLKC VDD CLKT
ABX023x
1 2 3 4
GND
GND
GND
BLOCK DIAGRAM
SEL OE
PLL (Phase Locked Loop)
^: *:
Internal pull-up On 3x3 package, ABX0235/38 do not have SEL0 available: Pin 10 is VDD, pin 11 is GND.
However, ABX0237/39 have SEL0 (pin 10), and pin 11 is VDD.
See pin assignment table for details.
OUTPUT ENABLE LOGICAL LEVELS
Part # ABX0238 ABX0235 ABX0237 ABX0239 OE 0 (Default) 1 0 1 (Default) State Output enabled Tri-state Tri-state Output enabled
Q Q
XIN XOUT
Oscillator Amplifier
PLL by-pass
OE input: Logical states defined by PECL levels for ABX0238 Logical states defined by CMOS levels for ABX0235/37/39
30332 Esperanza.
, Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.
Abracon.
com 03/21/05 Page 1
GND
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ABX0235/37/38/39
750kHz – ...
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