LMH0302 3Gbps HD/SD SDI Cable Driver LMH0302 3Gbps HD/SD SDI Cable Driver

LMH0302 3Gbps HD/SD SDI Cable Driver LMH0302 3Gbps HD/SD SDI Cable Driver
LMH0302
3Gbps HD/SD SDI Cable Driver
General Description
Features
The LMH0302 3Gbps HD/SD SDI Cable Driver is designed
for use in SMPTE 424M, SMPTE 292M, SMPTE 344M, and
SMPTE 259M serial digital video applications. The LMH0302
drives 75Ω transmission lines (Belden 1694A, Belden 8281,
or equivalent) at data rates up to 2.97 Gbps.
The LMH0302 provides two selectable slew rates for SMPTE
259M and SMPTE 424M / 292M compliance. The output driver may be powered down via the output driver enable pin.
The LMH0302 is powered from a single 3.3V supply. Power
consumption is typically 125 mW in SD mode and 165 mW in
HD mode. The LMH0302 is available in a 16-pin LLP package.
■ SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE
■
■
■
■
■
■
■
■
■
259M compliant
Data rates to 2.97 Gbps
Supports DVB-ASI at 270 Mbps
Differential input
75Ω differential output
Selectable slew rate
Output driver power down control
Single 3.3V supply operation
Industrial temperature range: −40°C to +85°C
Typical power consumption: 125 mW in SD mode and
165 mW in HD mode
■ 16–pin LLP package
■ Footprint compatible with the LMH0002SQ
■ Replaces the Gennum GS2978
Applications
■ SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE
259M serial digital interfaces
■ Digital video routers and switches
■ Distribution amplifiers
Typical Application
20214602
© 2008 National Semiconductor Corporation
202146
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LMH0302 3Gbps HD/SD SDI Cable Driver
August 1, 2008
LMH0302
ESD Rating (HBM)
ESD Rating (MM)
ESD Rating (CDM)
Absolute Maximum Ratings (Note 1)
Supply Voltage:
Input Voltage (all inputs)
Output Current
Storage Temperature Range
Junction Temperature
Lead Temperature
(Soldering 4 Sec)
Package Thermal Resistance
θJA 16-pin LLP
θJC 16-pin LLP
−0.5V to 3.6V
−0.3V to VCC+0.3V
28mA
−65°C to +150°C
+125°C
4.5 kV
250V
2 kV
Recommended Operating
Conditions
Supply Voltage (VCC – VEE):
Operating Free Air Temperature (TA)
+260°C
3.3V ±5%
−40°C to +85°C
+64°C/W
+26°C/W
DC Electrical Characteristics
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Notes 2, 3).
Symbol
Parameter
VCMIN
Input Common Mode Voltage
VSDI
Input Voltage Swing
VCMOUT
Output Common Mode Voltage
VSDO
Output Voltage Swing
VIH
Input Voltage High Level
VIL
InputVoltage Low Level
ICC
Supply Current
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Conditions
Reference
SDI, SDI
Differential
Min
Max
Units
1.1 +
VSDI/2
VCC –
VSDI/2
V
100
2200
mVP−P
SDO, SDO
Single-ended, 75Ω load,
RREF = 750Ω 1%
VCC –
VSDO
720
SD/HD,
ENABLE
Typ
800
V
880
2.0
mVP-P
V
0.8
V
50
59
mA
SD/HD = 0,
SDO/SDO disabled
26
33
mA
SD/HD = 1,
SDO/SDO enabled
38
48
mA
SD/HD = 1,
SDO/SDO disabled
15
22
mA
SD/HD = 0,
SDO/SDO enabled
2
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Note 3).
Symbol
Parameter
DRSDI
Input Data Rate
tjit
Additive Jitter
tr,tf
Output Rise Time, Fall Time
Conditions
2.97 Gbps
Duty Cycle Distortion
tOS
Output Overshoot
RLSDO
Output Return Loss
Min
Typ
SDO, SDO
Max
Units
2970
Mbps
20
psP-P
1.485 Gbps
18
psP-P
270 Mbps
15
SD/HD = 0, 20% – 80%,
90
SD/HD = 1, 20% – 80%
Mismatch in Rise/Fall Time
Reference
SDI, SDI
400
psP-P
130
ps
800
ps
SD/HD = 0
30
ps
SD/HD = 1
50
ps
SD/HD = 0, 2.97 Gbps, (Note
4)
27
ps
SD/HD = 0, 1.485 Gbps, (Note
4)
30
ps
SD/HD = 1, (Note 4)
100
ps
SD/HD = 0, (Note 4)
10
%
SD/HD = 1, (Note 4)
8
%
5 MHz - 1.5 GHz, (Note 5)
15
dB
1.5 GHz - 3.0 GHz, (Note 5)
10
dB
Note 1: "Absolute Maximum Ratings" are those parameter values beyond which the life and operation of the device cannot be guaranteed. The stating herein of
these maximums shall not be construed to imply that the device can or should be operated at or beyond these values. The table of "Electrical Characteristics"
specifies acceptable device operating conditions.
Note 2: Current flow into device pins is defined as positive. Current flow out of device pins is defined as negative. All voltages are stated referenced to
VEE = 0 Volts.
Note 3: Typical values are stated for VCC = +3.3V and TA = +25°C.
Note 4: Specification is guaranteed by characterization.
Note 5: Output return loss is dependent on board design. The LMH0302 meets this specification on the SD302 evaluation board.
3
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LMH0302
AC Electrical Characteristics
LMH0302
Connection Diagram
20214605
The exposed die attach pad is a negative electrical terminal for this device. It should be connected to the negative power supply voltage.
16-Pin LLP
Order Number LMH0302SQ
See NS Package Number SQB16A
Pin Descriptions
Pin
Name
Description
1
SDI
Serial data true input.
2
SDI
Serial data complement input.
3
VEE
Negative power supply (ground).
4
RREF
Output driver level control. Connect a resistor to VCC to set output voltage swing.
5
NC
No connect. Not bonded internally.
6
ENABLE
Output driver enable. When low, the SDO/SDO output driver is powered off. ENABLE has an
internal pulllup.
7
NC
No connect. Not bonded internally.
8
NC
No connect. Not bonded internally.
9
VCC
Positive power supply (+3.3V).
10
SD/HD
Output slew rate control. Output rise/fall time complies with SMPTE 424M / 292M when low and
SMPTE 259M when high.
11
SDO
Serial data complement output.
12
SDO
Serial data true output.
13
NC
No connect. Not bonded internally.
14
NC
No connect. Not bonded internally.
15
NC
No connect. Not bonded internally.
16
NC
No connect. Not bonded internally.
DAP
VEE
Connect exposed DAP to negative power supply (ground).
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4
the RREF network should be removed to minimize parasitic
capacitance.
INPUT INTERFACING
The LMH0302 accepts either differential or single-ended input. The inputs are self-biased, allowing for simple AC or DC
coupling. DC-coupled inputs must be kept within the specified
common-mode range.
OUTPUT SLEW RATE CONTROL
The LMH0302 output rise and fall times are selectable for either SMPTE 259M or SMPTE 424M / 292M compliance via
the SD/HD pin. For slower rise and fall times, or SMPTE 259M
compliance, SD/HD is set high. For faster rise and fall times,
or SMPTE 424M and SMPTE 292M compliance, SD/HD is
set low.
OUTPUT INTERFACING
The LMH0302 uses current mode outputs. Single-ended output levels are 800 mVP-P into 75Ω AC-coupled coaxial cable
with an RREF resistor of 750Ω. The RREF resistor is connected
between the RREF pin and VCC. The only resistor value that
should be used for RREF is 750Ω..
The RREF resistor should be placed as close as possible to
the RREF pin. In addition, the copper in the plane layers below
OUTPUT ENABLE
The SDO/SDO output driver can be enabled or disabled with
the ENABLE pin. When set low, the output driver is powered
off. ENABLE has an internal pullup.
5
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LMH0302
Device Operation
LMH0302
Physical Dimensions inches (millimeters) unless otherwise noted
16-Pin LLP
Order Number LMH0302SQ
NS Package Number SQB16A
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6
LMH0302
Notes
7
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LMH0302 3Gbps HD/SD SDI Cable Driver
Notes
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