LMH0036 Datasheet, PDF (11/19 Pages) National Semiconductor (TI) – SD SDI Reclocker with 4:1 Input Multiplexer

LMH0036
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SNLS254B – MARCH 2008 – REVISED APRIL 2013
APPLICATION INFORMATION
Figure 5 shows a application circuit for the LMH0036.
SCO_EN
SEL0
SEL1
V_CC
56 nF
V_CC
100:
Differential
Data Input 0
100:
Differential
Data Input 1
100:
Differential
Data Input 2
100:
Differential
Data Input 3
BP/ AUTO-BP
OP MUTE
1 _SDI0
2
SDI0
3 _VCC
4 _SDI1
5
SDI1
6 _VCC
7 _SDI2
8
SDI2
9 _VCC
10 _SDI3
11
SDI3
12 _VCC
V_CC
LMH0036
36
SD
V_CC
V_CC
35
34
33
SDO
32
SDO
V_CC ³¹
V_CC
30
29
SCO/SDO2
28
SCO/SDO2
V_EE ²⁷
V_EE ²⁶
V_EE ²⁵
DAP
27 MHz
39 pF
39 pF
SD
Data
Output
Clock Output or
2^nd Data Output
LOCK DET
Figure 5. Application Circuit
BYPASS/AUTO BYPASS has an internal pulldown to enable Auto Bypass mode by default. This pin may be
pulled high to force the LMH0036 to bypass all data.
OUTPUT MUTE has an internal pullup to enable the outputs by default. This pin may be pulled low to mute the
outputs.
The XTAL IN/EXT CLK and XTAL OUT pins are shown with a 27 MHz crystal and the proper loading. The crystal
should match the parameters described in Table 3. Alternately, a 27MHz LVCMOS compatible clock signal may
be input to XTAL IN/EXT CLK.
The active high LOCK DETECT output provides an indication that proper data is being received and the PLL is
locked.
The SD output may be used to drive the SD/HD pin of an SDI cable driver (such as the LMH0002) in order to
properly set the cable driver’s edge rate for SMPTE compliance. It defaults to low when the LMH0036 is not
locked.
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