1 Features

? High-performance LVDS clock buffer family: up to

2GHz

– Dual 1:2 differential buffer

– Dual 1:4 differential buffer

– Dual 1:6 differential buffer

– Dual 1:8 differential buffer

? Supply voltage: 1.71V to 3.465V

? Dual output common mode voltage operation:

– Output common mode voltage: 0.7V at 1.8V

supply voltage.

– Output common mode voltage: 1.2V at 2.5V/

3.3V supply voltage

? Low additive jitter:

– < 17fs RMS typical in 12kHz to

20MHz at 1250.25MHz

– < 22fs RMS typical in 12kHz to

20MHz at 625MHz

– < 60fs RMS maximum in 12kHz to

20MHz at 156.25MHz

– Very low phase noise floor: -164dBc/Hz (typical

at 156.25MHz)

? Very low propagation delay: < 575ps maximum

? Output skew:

– 15ps maximum (LMK1D2102, LMK1D2104)

– 20ps maximum (LMK1D2106, LMK1D2106)

? Part to Part skew: 150ps

? High-swing LVDS (boosted mode): 500mV VOD

typical when AMP_SELA, AMP_SELB= Floating

? Bank enable/disable using AMP_SELA and

AMP_SELB Section 8.4.1

? Fail-safe input operation

? Universal inputs accept LVDS, LVPECL, LVCMOS,

HCSL and CML signal levels

? LVDS reference voltage, VAC_REF, available for

capacitive-coupled inputs

? Extended industrial temperature range: –40°C to

105°C

2 Applications

? Telecommunications and networking

? Medical imaging

? Test and measurement

? Wireless infrastructure

? Pro audio, video and signage

3 Description

The LMK1D210xL is a low noise dual clock buffer

which distributes one input to a maximum of 2

(LMK1D2102L), 4 (LMK1D2104L), 6 (LMK1D2106L)

or 8 (LMK1D2108L) LVDS outputs. The inputs can

either be LVDS, LVPECL, HCSL, CML, or LVCMOS.

The LMK1D210xL is specifically designed for driving

50Ω transmission lines. When driving inputs in singleended

mode, apply the appropriate bias voltage to the

unused negative input pin (see Figure 8-8).

LMK1D210xL buffer offers two output common mode

operation (0.7V and 1.2V) for different operating

supply. The device provides flexibility in design for

DC-coupled mode applications.

AMP_SELA / AMP_SELB control pin can be used

to select different output amplitude LVDS (350mV)

or boosted LVDS (500mV). In addition to amplitude

selection, outputs can be disabled using the same pin.

The part also supports Fail-Safe Input function for

clock and digital input pins. The device further

incorporates an input hysteresis which prevents

random oscillation of the outputs in the absence of

an input signal.