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| LMH0046MH Datasheet, PDF (11/20 Pages) Texas Instruments – LMH0046 HD/SD SDI Reclocker With Dual Differential Outputs | |||
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www.ti.com
SDI
NO DATA
270 MBPS DATA
NO DATA
TACQ
T2
Lock
Detect
T1
T1
SD/HD
LMH0046
SNLS222F â APRIL 2006 â REVISED APRIL 2013
1485 MBPS DATA
NO DATA
TACQ
T2
T1
SDI
NO DATA
143 MBPS DATA
TACQ
270 MBPS DATA
TACQ
T2
1485 MBPS DATA
270 MBPS DATA
TACQ
TACQ
T2
T2
Lock
Detect
SD/HD
T1
T1
T1
T1
T1
T1
TACQ = Acquisition Time, defined in the AC Electrical Characteristics Table
T1 = Time from Lock Detect assertion or deassertion until SD/HD output is valid, typically 37 ns (one 27 MHz clock period)
T2 = Time from SDI input change until Lock Detect de-assertion, 1 ms maximum. SD/HD output is not valid during this time.
Figure 6. SDI, Lock Detect, and SD/HD Timing
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 LMH0046 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.
Copyright © 2006â2013, Texas Instruments Incorporated
Product Folder Links: LMH0046
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