mx1ds10p- Centellax, mx1ds10p- Datasheet - Page 5

• Manufacturer Part Number: mx1ds10p-
• Description: 15 Ghz Ultra - Variable Broadband Prescaler
• Manufacturer: Centellax

Differential vs Single-Ended
The MX1DS10P is fully differential to maximize signal-to-noise ratios for high-speed operation. All high speed
inputs and outputs are terminated to Vcc with on-chip resistors (refer to functional block diagram for specific
resistor values). The maximum DC voltage on any terminal must be limited to V
to prevent damaging the ter-
max
mination resistors with excessive current. Regardless of bias conditions, the following equation should be sat-
isfied when driving the inputs differentially:
I V
/2 + V
I < Vcc > V
dm
cm
max
where V
is the differential input signal and V
is the common-mode voltage.
dm
cm
In addition to the maximum input signal levels, single-ended operation imposes additional restrictions: the
average DC value of the waveform at IC should be equal to Vcc for single-ended operation. In practice, this is
easily achieved with a single capacitor on the input acting as a DC block. The value of the capacitor should
be large enough to pass the lowest frequencies of interest. Use the positive terminals for single-ended opera-
tion while terminating the negative terminal to Vcc.
Note that a potential oscillation mechanism exists if both inputs are static and have identical DC voltages; a
small DC offset on either input is sufficient to prevent possible oscillations. Tying unused inputs directly to Vcc
shorts out the internal 50Ω bias resistor, imposing a DC offset sufficient to prevent oscillations. Driving the dif-
ferential inputs with DC blocks, or driving the single-ended inputs without terminating unused inputs, is not
recommended without taking additional steps to eliminate the potential oscillation issues.
Positive Supply (AC Coupling)
CENTELLAX
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PAGE 5
Specifications subject to change without notice. Copyright © 2001-2008 Centellax, Inc. Printed in USA. 29 Feb 2008.