CDCM1802_15 Datasheet, PDF (1/30 Pages) Texas Instruments – CDCM1802 Clock Buffer With Programmable Divider, LVPECL I/O + Additional LVCMOS Output

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CDCM1802
SCAS759B – APRIL 2004 – REVISED NOVEMBER 2015
CDCM1802 Clock Buffer With Programmable Divider,
LVPECL I/O + Additional LVCMOS Output
1 Features
•1 Distributes One Differential Clock Input to One
LVPECL Differential Clock Output and One
LVCMOS Single-Ended Output
• Programmable Output Divider for Both LVPECL
and LVCMOS Outputs
• 1.6-ns Output Skew Between LVCMOS and
LVPECL Transitions Minimizing Noise
• 3.3-V Power Supply (2.5-V Functional)
• Signaling Rate Up to 800-MHz LVPECL and
200-MHz LVCMOS
• Differential Input Stage for Wide Common-Mode
Range Also Provides VBB Bias Voltage Output for
Single-Ended Input Signals
• Receiver Input Threshold ±75 mV
• 16-Pin VQFN Package (3.00 mm × 3.00 mm)
3 Description
The CDCM1802 clock driver distributes one pair of
differential clock input to one LVPECL differential
clock output pair, Y0 and Y0, and one single-ended
LVCMOS output, Y1. It is specifically designed for
driving 50-Ω transmission lines. The LVCMOS output
is delayed by 1.6 ns over the PECL output stage to
minimize noise impact during signal transitions.
The CDCM1802 has two control pins, S0 and S1, to
select different output mode settings. The S[1:0] pins
are 3-level inputs. Additionally, an enable pin EN is
provided to disable or enable all outputs
simultaneously. The CDCM1802 is characterized for
operation from −40°C to 85°C.
For single-ended driver applications, the CDCM1802
provides a VBB output pin that can be directly
connected to the unused input as a common-mode
voltage reference.
2 Applications
• Networking and Data Communications
• Medical Imaging
• Portable Test and Measurement
• High-end A/V
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
CDCM1802
VQFN (16)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Application Example
CDCM1802
Setting for Mode 4:
EN = V_DD/2
S1 = 0
S0 = 1
250 MHz
R_S0 = open
R_S1 = 0
R_EN = 60lQ
IN, IN
S0
S1
EN
Y0,Y0
Y1
125 MHz
125 MHz
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.