CDCM1802

S0

S1

EN

REN = 60lQ

RS1 = 0

RS0 = open

Setting for Mode 4:

EN = VDD/2

S1 = 0

S0 = 1

IN, IN

Y0,Y0

250 MHz

Y1

125 MHz

125 MHz

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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.

CDCM1802

SCAS759C – APRIL 2004 – REVISED JULY 2017

CDCM1802 Clock Buffer With Programmable Divider,

LVPECL I/O + Additional LVCMOS Output

1

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)

2 Applications

•

Networking and Data Communications

•

Medical Imaging

•

Portable Test and Measurement

•

High-end A/V

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.

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