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PDF LMH0303 Data sheet ( Hoja de datos )
| Número de pieza | LMH0303 | |
| Descripción | 3 Gbps HD/SD SDI Cable Driver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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PRELIMINARY
July 10, 2008
LMH0303
3 Gbps HD/SD SDI Cable Driver with Cable Detect
General Description
The LMH0303 3 Gbps HD/SD SDI Cable Driver with Cable
Detect is designed for use in SMPTE 424M, SMPTE 292M,
SMPTE 344M, and SMPTE 259M serial digital video appli-
cations. The LMH0303 drives 75Ω transmission lines (Belden
1694A, Belden 8281, or equivalent) at data rates up to 2.97
Gbps.
The LMH0303 includes intelligent sensing capabilities to im-
prove system diagnostics. The cable detect feature senses
near-end termination to determine if a cable is correctly at-
tached to the output BNC. Input loss of signal (LOS) detects
the presence of a valid signal at the input of the cable driver.
These sensing features may be used to alert the user of a
system fault and activate a deep power save mode, reducing
the cable driver's power consumption to 3 mW. These fea-
tures are accessible via an SMBus interface.
The LMH0303 provides two selectable slew rates for SMPTE
259M and SMPTE 424M / 292M compliance. The output am-
plitude is adjustable ±10% in 5 mV steps via the SMBus.
The LMH0303 is powered from a single 3.3V supply. Power
consumption is typically 130 mW in SD mode and 155 mW in
HD mode. The LMH0303 is available in a 16-pin LLP pack-
age.
The LMH0303 interfaces with National's LMH0356 for addi-
tional system control and power consumption savings (see
Typical Application).
Features
■ SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE
259M compliant
■ Data rates to 2.97 Gbps
■ Cable detect on output
■ Loss of signal detect at input
■ Output driver power down control
■ Typical power consumption: 130 mW in SD mode and
155 mW in HD mode
■ Power save mode typical power consumption: 4 mW
■ Single 3.3V supply operation
■ Differential input
■ 75Ω differential output
■ Selectable slew rate
■ Industrial temperature range: −40°C to +85°C
■ 16–pin LLP package
■ Footprint compatible with the LMH0302
Applications
■ SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE
259M serial digital interfaces
■ Digital video routers and switches
■ Distribution amplifiers
Typical Application
© 2008 National Semiconductor Corporation 300432
30043203
www.national.com
1 page  
wwPwi.nDatDaSehesect4Uri.cpomtions
Pin Name
1 SDI
2 SDI
3 VEE
4 RREF
5 RSTI
6 ENABLE
7 SDA
8 SCL
9 VCC
10 SD/HD
11 SDO
12 SDO
13 FAULT
14 NC
15 NC
16 RSTO
DAP VEE
Description
Serial data true input.
Serial data complement input.
Negative power supply (ground).
Bias resistor. Connect a 750Ω resistor to VCC.
Reset input.
H = Normal operation.
L = Device reset. The device operates with default register settings. Forcing RSTI low also forces
RSTO low.
Output driver enable (with internal pullup).
H = Normal operation.
L = Output driver powered off.
SMBus bidirectional data pin. When functioning as an output, it is open drain. This pin requires an
external pullup.
SMBus clock input. SCL is input only. This pin requires an external pullup.
Positive power supply (+3.3V).
Output slew rate control.
H = Output rise/fall time complies with SMPTE 259M.
L = Output rise/fall time complies with SMPTE 424M / 292M.
Serial data complement output.
Serial data true output.
Fault open drain output flag. Requires external pullup resistor and may be wire ORed with multiple
cable drivers.
H = Normal operation.
L = Loss of signal or termination fault for any output.
No connect. Not bonded internally.
No connect. Not bonded internally.
Reset output. RSTO is automatically set to 1 when register 0 is written. It can be reset back to zero
by forcing RSTI to zero to reset the device. Used to daisy chain multiple cable drivers on the same
SMBus.
Connect exposed DAP to negative power supply (ground).
5 www.national.com
5 Page 
Address R/W Name
ww0w5.hDataSRh/eWet4UO.UcoTmPUTCTRL
Bits Field
7 RSVD
6 FLOSOF
5 FLOSON
4 LOSEN
3 MUTE
06h R/W RSVD
07h R/W RSVD
08h R/W TEST
2:0 SDTFThresh
7:0 RSVD
7:0 RSVD
7:5 CMPCMD
4:0 RSVD
Default Description
0 Reserved as 0. Always write 0 to this bit.
0 Force LOS to always OFF (signal never detected). This
forces the device into either the mute or “add offset” state.
The device will behave as if there is no signal regardless of
the input.
0: LOS operates normally, muting or adding offset as
specified by the MUTE bit.
1: Signal is never detected. Muting or adding offset is always
in place as specified by the MUTE bit.
0 Force LOS to always ON (signal always detected). This
prevents the device from muting or adding offset and makes
the LOS have no effect on device operation. (The LOS bit
in register 01h still reflects the state of LOS).
0: LOS operates normally, muting or adding offset as
specified in the MUTE bit.
1: LOS never causes muting or the addition of offset.
0 Configures LOS to be combined with the ENABLE
functionality.
0: Only the PD bit and ENABLE pin affect the power down
state of the output drivers.
1: If the ENABLE pin is set to ground, it powers down the
output drivers regardless of the state of LOS or the PD bit.
With the ENABLE pin set to VCC, LOS=0 will power down
the output drivers, and LOS=1 will leave the power down
state dependent on the PD bit.
0 Selects whether the device will MUTE when loss of signal
is detected or add an offset to prevent self oscillation. When
an input signal is detected (LOS=1), the device will operate
normally.
0: Loss of signal will force a small offset to prevent self
oscillation.
1: Loss of signal will force the channel to MUTE.
010 Sets the Termination Fault threshold for SDO, when SD is
set to SD rates (1). Combines with SDTFThreshLSB in
register 03h (default for combined value is 0100).
00000000 Reserved as 00000000. Always write 00000000 to these
bits.
00000000 Reserved as 00000000. Always write 00000000 to these
bits.
000 Compare command. Determines whether the peak value or
the current value of the Termination Fault counters is read
in registers 0Ah and 0Bh.
000: Resets compare value to 00; registers 0Ah and 0Bh
show current counter values. Sets detection to look for MAX
peak values.
001: Capture counter 0. Register 0Ah shows peak value.
010: Capture counter 1. Register 0Bh shows peak value.
011, 100: Reserved.
101: Resets compare value to 1Fh. Sets detection to look
for MIN peak values.
110, 111: Reserved.
00000 Reserved as 00000. Always write 00000 to these bits.
11 www.national.com
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LMH0303.PDF ] | |
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