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PDF UXC20P Data sheet ( Hoja de datos )
| Número de pieza | UXC20P | |
| Descripción | DC-20GHz Programmable Binary Prescaler | |
| Fabricantes | Centellax | |
| Logotipo |  |
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UXC20P - Datasheet
CENTELLAX
DC - 20 GHz Programmable Binary Prescaler
Features
• Wide Operating Range: DC - 20GHz
• Low SSB Phase Noise: -153 dBc @ 10kHz
• Large Output Swings: >1 Vppk/side
• Single-Ended and/or Differential Operation
• Low Power Consumption: 0.6W
• 4x4 QFN Package
• 3 Dividers-in-One
24 pin Quad Flat No Lead (QFN)
4x4 mm pkg, 0.5mm pad pitch
JEDEC MO-220 Compliant
Description
Marking Information:
UXC20P = Device Part Number
YYDD = Year & Work Week
XXXX = Reserved for future use
The UXC20P is a low noise programmable prescaler featuring either divide-by-2, divide-by-4, or divide-by-8
division ratios. The device features differential inputs and outputs, adjustable output swing and high input sen-
sitivity. The control inputs are CMOS and LVTTL compatible. The UXC20P is packaged in a 24 pin, 4mm x
4mm leadless surface mount package.
Application
The UXC20P can be used as a general purpose, fixed modulus prescaler in high frequency PLLs. The low
phase noise of the divider makes it ideal for generating low jitter, synchronous clocks in telecom applications.
Key Specifications (T=25 ºC)
Vee = -3.3V, Iee = 165mA, Zo = 50Ω
Parameter
Description
Minimum
Fin (GHz)
Pin (dBm)
Pout (dBm)
£(dBc/Hz)
Input Frequency
Nominal Input Power
Nominal Output Power
SSB Phase Noise @10kHz Offset
DC*
-10
-5
-
Pdc (mW)
DC Power Dissipation
-
Pspitback (dBm)
Freq/2 Power Spitback @Input
Pfundamental (dBm)
Fundamental Feedthru @Output
*Low frequency limit dependent on input edge speed
-
-
Typical
-
0
+5
-153
550
TBD
TBD
Maximum
20
+10
-
-
-
-
-
CENTELLAX • Web: http://www.centellax.com/ • Email: [email protected] • Tel: 866.522.6888 • Fax: 707.568.7647
Specifications subject to change without notice. Copyright © 2001-2006 Centellax, Inc. Printed in USA. 17 Aug 2006.
PAGE 1
1 page  
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An optional on chip temperature diode is provided for
users interested in evaluating the IC’s temperature. A
single resistor to VCC establishes a nominal current thru
the diode. The voltage developed across the tempera-
ture pin (pin 8) referenced to VEE (pin 9) can then be
used to indicate the surface temperature of the IC. The
plot below was obtained by forcing a fixed current thru
the diode for an unbiased device at multiple tempera-
tures and fitting a line to the data to allow extrapolation
over a range of temperatures.
Figure 3:
Diode Voltage vs Temp for 2 Bias Currents
Package Heatsink
The package backside provides the primary heat conduction path and should be attached to a good heatsink
on the PC board to maximize preformance. User PC boards should maximize the contact area to the package
paddle and contain an array of vias to aid thermal conduction to either a backside heatsink or internal copper
planes.
IC Assembly
The device is designed to operate with either single-ended or differential inputs. Figures 4, 5 & 6 show the IC
assembly diagrams for positive and negative supply voltages. In either case the supply should be capacitively
bypassed to the ground to provide a good AC ground over the frequency range of interest. The backside of the
chip should be connected to a good thermal heat sink.
All RF I/O’s are connected to VCC through on-chip termination resistors. This implies that when VCC is not DC
grounded (as in the case of positive supply), the RF I/O’s should be AC coupled through series capacitors unless
the connecting circuit can generate the correct levels through level shifting.
Negative CML Logic Levels for DC Coupling (T=25 ºC)
Assuming 50Ω Terminations at Inputs and Outputs
Parameter
Minimum
Typical
Differential
{ Logic Inputhigh
Logic Inputlow
Vcc
Vcc - 0.05V
Vcc
Vcc - 0.3V
Single
Differential
&
Single
{ Logic Inputhigh
Logic Inputlow
Vcc + 0.05V
Vcc - 0.05V
{ Logic Outputhigh
Logic Outputlow
Vcc - 0.9V
Vcc - 1.3V
Vcc + 0.3V
Vcc - 0.3V
Vcc - 0.6V
Vcc - 1.6V
Maximum
Vcc
Vcc - 1V
Vcc + 1V
Vcc - 1V
Vcc - 0.5
Vcc - 1.7V
CENTELLAX • Web: http://www.centellax.com/ • Email: [email protected] • Tel: 866.522.6888 • Fax: 707.568.7647
Specifications subject to change without notice. Copyright © 2001-2006 Centellax, Inc. Printed in USA. 17 Aug 2006.
PAGE 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet UXC20P.PDF ] | |
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