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LMH0056 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LMH0056 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 13 page Control Inputs and Indicator Outputs (Continued) 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 out- put 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. TABLE 4. Crystal Parameters Parameter Value Frequency 27 MHz Frequency Stability ±100 ppm @ recommended drive level Operating Mode Fundamental mode, Parallel Resonant Load Capacitance 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 www.national.com 11 |
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