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LMH0046MT Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LMH0046MT Datasheet(HTML) 8 Page - National Semiconductor (TI) |
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8 / 10 page  Control Inputs and Indicator Outputs (Continued) MUTE The MUTE input, when low, mutes the serial data and clock outputs. It may be connected to Lock Detect or externally driven to mute or un-mute the outputs. If MUTE is connected to LD, then the data and clock outputs are muted when the PLL is not locked. This function overrides the Bypass func- tion: see Table 2. BYPASS/AUTO BYPASS The Bypass/Auto Bypass input, when high, forces the device to output the data without reclocking it. When this input is low, the device automatically bypasses the reclocking func- tion when the device is in an unlocked condition or the detected data rate is a rate which the device does not support. See Table 2. TABLE 2. Control Functionality LOCK DETECT OUTPUT MUTE BYPASS/AUTO BYPASS DEVICE STATUS 0 1 0 PLL unlocked, reclocker bypassed 1 1 0 PLL locked to supported data rate, reclocker not bypassed X 0 X Outputs muted 0 LOCK DETECT X Outputs muted 1 LOCK DETECT 0 PLL locked to supported data rate, reclocker not bypassed 1 LOCK DETECT 1 PLL locked to supported data rate, reclocker bypassed X 1 1 Outputs not muted, reclocker bypassed SD/HD The SD/HD output indicates whether the LMH0046 is pro- cessing SD or HD data rates. It may be used to control another device such as the LMH0002 cable driver. When this output is high it indicates that the data rate is 270 Mbps (or 143 Mbps). When low, the indicated data rate is 1483 or 1485 Mbps. The SD/HD output is only valid when the PLL is locked and the Lock Detect output is high. When the PLL is not locked (the Lock Detect output is low), the SD/HD output will toggle between SD and HD. 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 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 3. TABLE 3. 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 8 |
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