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LMH0307 Datasheet PDF - National Semiconductor

Part Number LMH0307
Description 3 Gbps HD/SD SDI Dual Cable Driver
Manufacturers National Semiconductor 
Logo National Semiconductor Logo 



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LMH0307 datasheet, circuit
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PRELIMINARY
June 26, 2008
LMH0307
3 Gbps HD/SD SDI Dual Cable Driver with Cable Detect
General Description
The LMH0307 3 Gbps HD/SD SDI Dual Cable Driver with
Cable Detect is designed for use in SMPTE 424M, SMPTE
292M, SMPTE 344M, and SMPTE 259M serial digital video
applications. The LMH0307 implements two complementary
output drivers and drives 75transmission lines (Belden
1694A, Belden 8281, or equivalent) at data rates up to 2.97
Gbps.
The LMH0307 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 LMH0307 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 LMH0307 is powered from a single 3.3V supply. Power
consumption is typically 230 mW in SD mode and 275 mW in
HD mode. The LMH0307 is available in a 16-pin LLP pack-
age.
The LMH0307 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: 230 mW in SD mode and 275
mW in HD mode
Power save mode typical power consumption: 4 mW
Single 3.3V supply operation
Differential input
Dual complementary 75outputs
Selectable slew rate
Industrial temperature range: −40°C to +85°C
16–pin LLP package
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 300479
30047903
www.national.com

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LMH0307 equivalent
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 SDO0
12 SDO0
13 FAULT
14 SDO1
15 SDO1
16 RSTO
DAP VEE
Description
Serial data true input.
Serial data complement input.
Negative power supply (ground).
Bias resistor. Connect a 750resistor 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 output 0 complement output.
Serial data output 0 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.
Serial data output 1 true output.
Serial data output 1 complement output.
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

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Information Total 14 Pages
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