LMH0026MH/NOPB National Semiconductor, LMH0026MH/NOPB Datasheet - Page 10

• Manufacturer Part Number: LMH0026MH/NOPB
• Description: IC RECLOCKER SDI HD/SD 20-TSSOP
• Manufacturer: National Semiconductor
• Type: Reclockerr

Specifications of LMH0026MH/NOPB

• Applications: Digital Video
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP Exposed Pad, 20-eTSSOP, 20-HTSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LMH0026MH

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DC coupled to the input of the receiving device as long as the
common mode ranges of both devices are compatible.
4
LMH0026 and LMH0001 cable driver. All that is required is a
100Ω differential termination as shown. The resistor should
be placed as close to the LMH0001 input as possible. If de-
sired, this network may be terminated with two 50Ω resisters
and a center tap capacitor to ground in place of the single
100Ω resistor.
The external loop filter capacitor (between LF1 and LF2)
should be 56 nF. This is the only supported value; the loop
filter capacitor should not be changed.
BYPASS/AUTO BYPASS has an internal pulldown to enable
Auto Bypass mode by default. This pin may be pulled high to
force the LMH0026 to bypass all data.
OUTPUT MUTE has an internal pullup to enable the outputs
by default. This pin may be pulled low to mute the outputs.
The XTAL IN/EXT CLK and XTAL OUT pins are shown with
a 27 MHz crystal and the proper loading. The crystal should
shows an example of a DC coupled interface between the
Figure
10
match the parameters described in
27MHz LVCMOS compatible clock signal may be input to
XTAL IN/EXT CLK.
The active high LOCK DETECT output provides an indication
that proper data is being received and the PLL is locked.
The SD output may be used to drive the SD/HD pin of an SDI
cable driver (such as the LMH0002) in order to properly set
the cable driver’s edge rate for SMPTE compliance. It defaults
to low when the LMH0026 is not locked.
SCO_EN has an internal pulldown to set the second output
(SCO/SDO2) to output data. This pin may be pulled high to
set the second output as a serial clock.
The ground connection for the LMH0026 is through the large
exposed DAP. The DAP must be connected to ground for
proper operation of the LMH0026.
Table
2. Alternately, a