LMH0202
Dual SMPTE 292M / 259M Serial Digital Cable Driver
General Description
The LMH0202 Dual 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
LMH0202 drives 75Ωtransmission lines (Belden 8281,
Belden 1694A or equivalent) at data rates up to 1.485 Gbps.
The LMH0202 provides two selectable slew rates for
SMPTE 259M and SMPTE 292M compliance. The output
voltage swing is adjustable via a single external resistor.
The LMH0202 offers the flexibility to implement either dual
differential inputs or a single differential input (externally
routed via PCB) to dual differential outputs. The latter option
provides an ideal solution for DVB-ASI applications where
only the non-inverted outputs are typically used.
The LMH0202 is powered from a single 3.3V supply. Power
consumption is typically 250mW in SD mode and 298mW in
HD mode.
Features
nSMPTE 292M, SMPTE 344M and SMPTE 259M
compliant
nData rates to 1.485 Gbps
nDual differential inputs
nDual 75Ωdifferential outputs
nTwo selectable slew rates
nAdjustable output amplitude
nSingle 3.3V supply operation
nCommercial temperature range: 0˚C to +70˚C
nTypical power consumption: 250mW in SD mode and
298mW in HD mode
Applications
nSMPTE 292M, SMPTE 344M, and SMPTE 259M serial
digital interfaces
nDVB-ASI applications
nSonet/SDH and ATM interfaces
nDigital routers and switches
nDistribution amplifiers
nBuffer applications
nVideo cameras
Connection Diagram
20173101
16-Pin TSSOP
Order Number LMH0202MT
See NS Package Number MTC16
June 2006
LMH0202 Dual SMPTE 292M / 259M Serial Digital Cable Driver
© 2006 National Semiconductor Corporation DS201731 www.national.com
Typical Application
20173102
LMH0202
www.national.com 2
Absolute Maximum Ratings (Note 1)
Supply Voltage: −0.5V to 3.6V
Input Voltage (all inputs) −0.3V to V
CC
+0.3V
Output Current 28mA
Storage Temperature Range −65˚C to +150˚C
Junction Temperature +150˚C
Lead Temperature
(Soldering 4 Sec) +260˚C
Package Thermal Resistance
θ
JA
16-pin TSSOP
θ
JC
16-pin TSSOP
+125˚C/W
+105˚C/W
ESD Rating (HBM) 5kV
ESD Rating (MM) 250V
Recommended Operating
Conditions
Supply Voltage (V
CC
–V
EE
): 3.3V ±5%
Operating Free Air Temperature (T
A
)
LMH0202MT 0˚C to +70˚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
V
CMIN
Input Common Mode Voltage SDI1, SDI1,
SDI2, SDI2
1.6 +
V
SDI
/2
V
CC
–
V
SDI
/2 V
V
SDI
Input Voltage Swing Differential 100 2000 mV
P−P
V
CMOUT
Output Common Mode Voltage SDO1, SDO1,
SDO2, SDO2
V
CC
–
V
SDO
V
V
SDO
Output Voltage Swing Single-ended, 75Ωload,
R
REF
1 = 750Ω1%
R
REF
2 = 750Ω1%
750 800 850 mV
P-P
Single-ended, 75Ωload,
R
REF
1 = 590Ω1%
R
REF
2 = 590Ω1%
900 1000 1100 mV
P-P
V
SDHD
SD/HD Input Voltage Min for SD SD/HD1,
SD/HD2
2.4 V
Max for HD 0.8 V
I
SDHD
SD/HD Input Current 3.7 µA
I
CC
Supply Current SD/HD1 = 0, SD/HD2 = 0,
(Note 5) 90 98 mA
SD/HD1 = 1, SD/HD2 = 1,
(Note 5) 76 86 mA
AC Electrical Characteristics
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Note 3).
Symbol Parameter Conditions Reference Min Typ Max Units
DR
SDI
Input Data Rate (Note 4) SDI1, SDI1,
SDI2, SDI2 1485 Mbps
t
jit
Additive Jitter 1.485 Gbps SDO1, SDO1,
SDO2, SDO2
26 ps
P-P
270 Mbps 18 ps
P-P
t
r
,t
f
Output Rise Time, Fall Time SD/HD1 = 0, SD/HD2 = 0,
20% – 80%, (Note 6) 120 220 ps
SD/HD1 = 1, SD/HD2 = 1,
20% – 80%, (Note 6) 400 560 800 ps
Mismatch in Rise/Fall Time (Note 4) 30 ps
t
OS
Output Overshoot (Note 4) 8 %
RL
SDO
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.
LMH0202
www.national.com3
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 LMH0202 meets this specification on the SD202 evaluation board from 5MHz to 1.5GHz.
Pin Descriptions
Pin # Name Description
1 SDI1 Serial data true input.
2 SDI1 Serial data complement input.
3V
EE
1 Negative power supply (ground).
4R
REF
1 Output driver level control. Connect a resistor to V
CC
to set output voltage swing.
5 SDI2 Serial data true input.
6 SDI2 Serial data complement input.
7V
EE
2 Negative power supply (ground).
8R
REF
2 Output driver level control. Connect a resistor to V
CC
to set output voltage swing.
9V
CC
2 Positive power supply (+3.3V).
10 SD/HD2 Output slew rate control. Output rise/fall time complies with SMPTE 292M when low and
SMPTE 259M when high.
11 SDO2 Serial data complement output.
12 SDO2 Serial data true output.
13 V
CC
1 Positive power supply (+3.3V).
14 SD/HD1 Output slew rate control. Output rise/fall time complies with SMPTE 292M when low and
SMPTE 259M when high.
15 SDO1 Serial data complement output.
16 SDO1 Serial data true output.
Device Operation
INPUT INTERFACING
The LMH0202 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. SDI and SDI are self-biased
at approximately 2.1V with V
CC
= 3.3V. Figure 1 shows the
differential input stage for SDI and SDI.
20173104
FIGURE 1. Differential Input Stage for SDI and SDI.
LMH0202
www.national.com 4
Device Operation (Continued)
DVB-ASI APPLICATIONS
The dual differential inputs of the LMH0202 may be exter-
nally routed to a single differential input as shown in Figure
2. This provides a solution for DVB-ASI applications where
two non-inverted outputs are needed.
OUTPUT INTERFACING
The LMH0202 uses current mode outputs. Single-ended
output levels are 800 mV
P-P
into 75ΩAC-coupled coaxial
cable (with R
REF
= 750Ω). Output level is controlled by the
value of the resistor connected between the R
REF
pin and
V
CC
.
The R
REF
resistor should be placed as close as possible to
the R
REF
pin. In addition, the copper in the plane layers
below the R
REF
network should be removed to minimize
parasitic capacitance.
OUTPUT SLEW RATE CONTROL
The LMH0202 output rise and fall times are selectable for
either SMPTE 259M or SMPTE 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 292M compliance, SD/HD is set low.
20173103
FIGURE 2. Single Differential Input for DVB-ASI
LMH0202
www.national.com5
Physical Dimensions inches (millimeters) unless otherwise noted
16-Pin TSSOP
Order Number LMH0202MT
NS Package Number MTC16
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform when
properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to result
in a significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
BANNED SUBSTANCE COMPLIANCE
National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C2) and Banned Substances
and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at:
www.national.com/quality/green.
Lead free products are RoHS compliant.
National Semiconductor
Americas Customer
Support Center
Email: new.feedback@nsc.com
Tel: 1-800-272-9959
National Semiconductor
Europe Customer Support Center
Fax: +49 (0) 180-530 85 86
Email: europe.support@nsc.com
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
National Semiconductor
Asia Pacific Customer
Support Center
Email: ap.support@nsc.com
National Semiconductor
Japan Customer Support Center
Fax: 81-3-5639-7507
Email: jpn.feedback@nsc.com
Tel: 81-3-5639-7560
www.national.com
LMH0202 Dual SMPTE 292M / 259M Serial Digital Cable Driver
