Datasheet

LMH0346
www.ti.com SNLS248J –APRIL 2007–REVISED APRIL 2013
CRYSTAL OR EXTERNAL CLOCK REFERENCE
The LMH0346 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 3.
Table 3. Crystal Parameters
Parameter Value
Frequency 27 MHz
Frequency Stability ±50 ppm @ recommended drive level
Operating Mode Fundamental mode, Parallel Resonant
Load Capacitance 18–20 pF
Shunt Capacitance 7 pF
Series Resistance 40Ω max.
Recommended Drive Level 100 µW
Maximum Drive Level 500 µW
Operating Temperature Range −10°C to +60°C
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