LMH0346

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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

40

Ω max.

Recommended Drive Level

100 µW

Maximum Drive Level

500 µW

Operating Temperature Range

−10°C to +60°C

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