LMH0056 datasheet(11/13 Pages) NSC

Part #	LMH0056

Description	HD/SD SDI Reclocker with 4:1 Input Multiplexer

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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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

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LMH0056 Datasheet(PDF) 11 Page - National Semiconductor (TI)

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