LMH0002
LMH0002 SMPTE 292M / 259M Serial Digital Cable Driver
Literature Number: SNLS215D
August 1, 2008
LMH0002
SMPTE 292M / 259M Serial Digital Cable Driver
General Description
The LMH0002 SMPTE 292M / 259M serial digital cable driver
is a monolithic, high-speed cable driver designed for use in
SMPTE 292M / 259M serial digital video and ITU-T G.703
serial digital data transmission applications. The LMH0002
drives 75Ω transmission lines (Belden 8281, Belden 1694A
or equivalent) at data rates up to 1.485 Gbps.
The LMH0002 provides two selectable slew rates for SMPTE
259M and SMPTE 292M compliance. The output voltage
swing is adjustable via a single external resistor.
The LMH0002 is powered from a single 3.3V supply. Power
consumption is typically 125 mW in SD mode and 149 mW in
HD mode. The LMH0002 is available in an 8-pin SOIC or 16-
pin LLP package.
Features
■SMPTE 292M, SMPTE 344M and SMPTE 259M
compliant
■Supports DVB-ASI at 270 Mbps
■Data rates to 1.485 Gbps
■Differential input
■75Ω differential output
■Selectable slew rate
■Adjustable output amplitude
■Single 3.3V supply operation
■Operating temperature range: Commercial 0°C to +70°C
(LMH0002MA) or Industrial −40°C to +85°C
(LMH0002TMA and LMH0002SQ)
■Typical power consumption: 125 mW in SD mode and
149 mW in HD mode
■8–pin SOIC or 16–pin LLP package
■Replaces the GS1528, GS1528A, or GS1578A.
Applications
■SMPTE 292M, SMPTE 344M, and SMPTE 259M serial
digital interfaces
■Sonet/SDH and ATM interfaces
■Digital routers and switches
■Distribution amplifiers
■Buffer applications
■Set top boxes
■Security cameras
Typical Application
20176102
© 2008 National Semiconductor Corporation 201761 www.national.com
LMH0002 SMPTE 292M / 259M Serial Digital Cable Driver
Absolute Maximum Ratings (Note 1)
Supply Voltage: −0.5V to 3.6V
Input Voltage (all inputs) −0.3V to VCC+0.3V
Output Current 28 mA
Storage Temperature Range −65°C to +150°C
Junction Temperature +150°C
Lead Temperature
(Soldering 4 Sec) +260°C
Package Thermal Resistance
θJA 8-pin SOIC
θJA 16-pin LLP
θJC 8-pin SOIC
θJC 16-pin LLP
+160°C/W
+78.9°C/W
+105°C/W
+42.7°C/W
ESD Rating (HBM) 5kV
ESD Rating (MM) 250V
Recommended Operating
Conditions
Supply Voltage (VCC – VEE): 3.3V ±5%
Operating Free Air Temperature (TA)
LMH0002MA
LMH0002TMA, LMH0002SQ
0°C to +70°C
−40°C to +85°C
DC Electrical Characteristics
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Notes 2, 3).
Symbol Parameter Conditions Reference Min Typ Max Units
VCMIN Input Common Mode Voltage SDI, SDI 1.6 +
VSDI/2 VCC –
VSDI/2 V
VSDI Input Voltage Swing Differential 100 2000 mVP−P
VCMOUT Output Common Mode Voltage SDO, SDO VCC –
VSDO
V
VSDO Output Voltage Swing Single-ended, 75Ω load,RREF =
750Ω 1% 750 800 850 mVP-P
Single-ended, 75Ω load,RREF =
590Ω 1% 900 1000 1100 mVP-P
SD/HD Input Voltage Min for SD SD/HD 2.4 V
Max for HD 0.8 V
SD/HD Input Current 3.7 µA
ICC Supply Current SD/HD = 0, (Note 5) 45 49 mA
SD/HD = 1, (Note 5) 38 43 mA
AC Electrical Characteristics
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Note 3).
Symbol Parameter Conditions Reference Min Typ Max Units
DRSDI Input Data Rate (Note 4) SDI, SDI 1485 Mbps
tjit Additive Jitter 1.485 Gbps SDO, SDO 26 psP-P
270 Mbps 18 psP-P
tr,tfOutput Rise Time, Fall Time SD/HD = 0, 20% – 80%, (Note
6) 120 220 ps
SD/HD = 1, 20% – 80% 400 560 800 ps
Mismatch in Rise/Fall Time (Note 4) 30 ps
Duty Cycle Distortion SD/HD = 0, (Note 4) 30 ps
SD/HD = 1, (Note 4) 100 ps
tOS Output Overshoot (Note 4) 8 %
RLSDO Output Return Loss (Note 7) 15 20 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.
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LMH0002
Note 5: Maximum ICC is measured at VCC = +3.465V and TA = +70°C.
Note 6: Specification is guaranteed by characterization and verified by test.
Note 7: Output return loss is dependent on board design. The LMH0002 meets this specification on the SD002 evaluation board from 5MHz to 1.5GHz.
Connection Diagrams
20176101
8-Pin SOIC
Order Number LMH0002MA or LMH0002TMA
See NS Package Number M08A
20176105
16-Pin LLP
Order Number LMH0002SQ
See NS Package Number SQB16A
Pin Descriptions
SOIC
Pin #
LLP
Pin #
Name Description
1 1 SDI Serial data true input.
2 2 SDI Serial data complement input.
3 3 VEE Negative power supply (ground).
4 4 RREF Output driver level control. Connect a resistor to VCC to set output voltage swing.
5 9 VCC Positive power supply (+3.3V).
6 10 SD/HD Output slew rate control. Output rise/fall time complies with SMPTE 292M when low
and SMPTE 259M when high.
7 11 SDO Serial data complement output.
8 12 SDO Serial data true output.
—5, 6, 7, 8,
13, 14, 15,
16
NC No connect.
—DAP VEE Connect exposed DAP to negative power supply (ground).
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LMH0002
Device Operation
INPUT INTERFACING
The LMH0002 accepts either differential or single-ended in-
put. The inputs are self-biased, allowing for simple AC or DC
coupling. DC-coupled inputs must be kept within the specified
common-mode range. SDI and SDI are self-biased at ap-
proximately 2.1V with VCC = 3.3V. Figure 1 shows the differ-
ential input stage for SDI and SDI.
20176104
FIGURE 1. Differential Input Stage for SDI and SDI.
OUTPUT INTERFACING
The LMH0002 uses current mode outputs. Single-ended out-
put levels are 800 mVP-P into 75Ω AC-coupled coaxial cable
(with RREF = 750Ω). Output level is controlled by the value of
the RREF resistor connected between the RREF pin and VCC.
The RREF resistor should be placed as close as possible to
the RREF pin. In addition, the copper in the plane layers below
the RREF network should be removed to minimize parasitic
capacitance.
OUTPUT SLEW RATE CONTROL
The LMH0002 output rise and fall times are selectable for ei-
ther SMPTE 259M or SMPTE 292M compliance via the SD/
HD pin. For slower rise and fall times, or SMPTE 259M com-
pliance, SD/HD is set high. For faster rise and fall times, or
SMPTE 292M compliance, SD/HD is set low.
REPLACING THE GENNUM GS1528, GS1528A, and
GS1578A
The LMH0002MA is form-fit-function compatible with the
Gennum GS1528 and GS1528A. The LMH0002SQ is form-
fit-function compatible with the Gennum GS1578A.
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LMH0002
Physical Dimensions inches (millimeters) unless otherwise noted
8-Pin SOIC
Order Number LMH0002MA or LMH0002TMA
NS Package Number M08A
16-Pin LLP
Order Number LMH0002SQ
NS Package Number SQB16A
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LMH0002
Notes
LMH0002 SMPTE 292M / 259M Serial Digital Cable Driver
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