LMH0056_15 Datasheet, PDF (12/20 Pages) Texas Instruments – HD/SD SDI Reclocker with 4:1 Input Multiplexer

LMH0056
SNLS236C – AUGUST 2006 – REVISED APRIL 2013
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SCO_EN
Input SCO_EN enables the SCO/SDO2 differential output to function either as a serial data-rate clock or second
serial data output. SCO/SDO2 functions as a serial data-rate clock when SCO_EN is high. This pin has an
internal pull-down device. The default state (low) enables the SCO/SDO2 output as a second serial data output.
CRYSTAL OR EXTERNAL CLOCK REFERENCE
The LMH0056 uses a 27 MHz crystal or external clock signal as a timing reference input. A 27 MHz parallel
resonant crystal and load network may be connected to the XTAL IN/EXT CLK and XTAL OUT pins.
Alternatively, a 27 MHz LVCMOS compatible clock signal may be input to XTAL IN/EXT CLK. Parameters for a
suitable crystal are given in Table 4.
Parameter
Frequency
Frequency Stability
Operating Mode
Load Capacitance
Shunt Capacitance
Series Resistance
Recommended Drive Level
Maximum Drive Level
Operating Temperature Range
Table 4. Crystal Parameters
Value
27 MHz
±50 ppm @ recommended drive level
Fundamental mode, Parallel Resonant
20 pF
7 pF
40Ω max.
100 µW
500 µW
−10°C to +60°C
12
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