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 75
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 125mW in SD mode and 149mW in
HD mode.
Features
n
SMPTE 292M, SMPTE 344M and SMPTE 259M
compliant
n
Data rates to 1.485 Gbps
n
Differential input
n
75
differential output
n
Selectable slew rate
n
Adjustable output amplitude
n
Single 3.3V supply operation
n
Operating temperature range: Commercial 0C to +70C
(LMH0002MA) or Industrial -40C to +85C
(LMH0002TMA)
n
Typical power consumption: 125mW in SD mode and
149mW in HD mode
n
Replaces the GS1528 and GS1528A
Applications
n
SMPTE 292M, SMPTE 344M, and SMPTE 259M serial
digital interfaces
n
Sonet/SDH and ATM interfaces
n
Digital routers and switches
n
Distribution amplifiers
n
Buffer applications
n
Set top boxes
n
Security cameras
Typical Application
20176102
January 2006
LMH0002
SMPTE
292M
/
259M
Serial
Digital
Cable
Driver
2006 National Semiconductor Corporation
DS201761
www.national.com
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
-65C to +150C
Junction Temperature
+150C
Lead Temperature
(Soldering 4 Sec)
+260C
Package Thermal Resistance
JA
8-pin SOIC
JC
8-pin SOIC
+125C/W
+105C/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
)
LMH0002MA
LMH0002TMA
0C to +70C
-40C to +85C
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
SDI, SDI
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
SDO, SDO
V
CC
V
SDO
V
V
SDO
Output Voltage Swing
Single-ended, 75
load,
R
REF
= 750
1%
750
800
850
mV
P-P
Single-ended, 75
load,
R
REF
= 590
1%
900
1000
1100
mV
P-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
A
I
CC
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
DR
SDI
Input Data Rate
(Note 4)
SDI, SDI
1485
Mbps
t
jit
Additive Jitter
1.485 Gbps
SDO, SDO
26
ps
P-P
270 Mbps
18
ps
P-P
t
r
,t
f
Output 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
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 V
EE
= 0 Volts.
Note 3: Typical values are stated for V
CC
= +3.3V and T
A
= +25C.
Note 4: Specification is guaranteed by characterization.
Note 5: Maximum I
CC
is measured at V
CC
= +3.465V and T
A
= +70C.
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.
LMH0002
www.national.com
2
Connection Diagram
20176101
8-Pin SOIC
Order Number LMH0002MA or LMH0002TMA
See NS Package Number M08A
Pin Descriptions
Pin #
Name
Description
1
SDI
Serial data true input.
2
SDI
Serial data complement input.
3
V
EE
Negative power supply (ground).
4
R
REF
Output driver level control. Connect a resistor to V
CC
to set output voltage swing.
5
V
CC
Positive power supply (+3.3V).
6
SD/HD
Output slew rate control. Output rise/fall time complies with SMPTE 292M when low and
SMPTE 259M when high.
7
SDO
Serial data complement output.
8
SDO
Serial data true output.
Device Operation
INPUT INTERFACING
The LMH0002 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.
20176104
FIGURE 1. Differential Input Stage for SDI and SDI.
LMH0002
www.national.com
3
Device Operation
(Continued)
OUTPUT INTERFACING
The LMH0002 uses current mode outputs. Single-ended
output levels are 800 mV
P-P
into 75
AC-coupled coaxial
cable (with R
REF
= 750
). Output level is controlled by the
value of the R
REF
resistor connected between pin 4 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 LMH0002 output rise and fall times are selectable for
either SMPTE 259M or SMPTE 292M compliance via pin 6,
SD/HD. 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.
REPLACING THE GENNUM GS1528
The LMH0002 is form-fit-function compatible with the Gen-
num GS1528 and GS1528A.
LMH0002
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4
Physical Dimensions
inches (millimeters) unless otherwise noted
8-Pin SOIC
Order Number LMH0002MA or LMH0002TMA
NS Package Number M08A
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.
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www.national.com
LMH0002
SMPTE
292M
/
259M
Serial
Digital
Cable
Driver
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