1 Features
• Low Additive Noise:
– –149dBc/Hz at 10kHz Offset Phase Noise
– 0.37ps (RMS) Output Jitter
• Limited Output Slew Rate for EMI Reduction
(1ns to 5ns Rise/Fall Time for 10pF to 50pF Loads)
• Adaptive Output Stage Controls Reflection
• Regulated 1.8V Externally Available I/O Supply
• Ultra-Small 8-bump YFP 0.4mm Pitch WCSP
(0.8mm × 1.6mm)
• ESD Performance Exceeds JESD 22
– 2000V Human-Body Model (A114-A)
– 1000V Charged-Device Model
(JESD22-C101-A Level III)

2 Applications
• Cellular Phones
• Global Positioning Systems (GPS)
• Wireless LAN
• FM Radio
• WiMAX
• W-BT

3 Description
The CDC3RL02 is a two-channel clock fan-out buffer
and is designed for use in portable end-equipment,
such as mobile phones, that require clock buffering
with minimal additive phase noise and fan-out
capabilities. The device buffers a single clock source,
such as a temperature compensated crystal oscillator
(TCXO) to multiple peripherals. The device has two
clock request inputs (CLK_REQ1 and CLK_REQ2),
each input can enable a single clock output.
The CDC3RL02 accepts square or sine waves at the
master clock input (MCLK_IN), eliminating the need
for an AC coupling capacitor. The smallest acceptable
sine wave is a 0.3V signal (peak-to-peak). CDC3RL02
is designed to offer minimal channel-to-channel skew,
additive output jitter, and additive phase noise. The
adaptive clock output buffers offer controlled slewrate
over a wide capacitive loading range which
minimizes EMI emissions, maintains signal integrity,
and minimizes ringing caused by signal reflections on
the clock distribution lines.
The CDC3RL02 has an integrated Low-Drop-Out
(LDO) voltage regulator which accepts input voltages
from 2.3V to 5.5V and outputs 1.8V, 50mA. This 1.8V
supply is externally available to provide regulated
power to peripheral devices such as a TCXO.
The CDC3RL02 is offered in a 0.4mm pitch die
size ball grid array (DSBGA) package (0.8mm
× 1.6mm), also known as wafer-level chip-scale
(WCSP) package, and is optimized for very low
standby current consumption.