INTERSIL LMH0001

LMH0001
SMPTE 259M / 344M Serial Digital Cable Driver
General Description
Features
The LMH0001 SMPTE 259M / 344M Serial Digital Cable Driver is designed for use in SMPTE 259M / 344M serial digital
video applications. The LMH0001 drives 75Ω transmission
lines (Belden 8281, Belden 1694A or equivalent) at data rates
up to 540 Mbps.
The output voltage swing of the LMH0001 is adjustable via a
single external resistor.
The LMH0001 is powered from a single 3.3V supply. Power
consumption is typically 125mW. The LMH0001 is available
in a 16-pin LLP package.
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SMPTE 259M and SMPTE 344M compliant
Data rates to 540 Mbps
Differential input
75Ω differential output
Adjustable output amplitude
Single 3.3V supply operation
Industrial temperature range: −40°C to +85°C
125mW typical power consumption
16–pin LLP package
Footprint compatible with the LMH0002SQ and the
GS9078A.
Applications
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SMPTE 259M and SMPTE 344M serial digital interfaces
Sonet/SDH and ATM interfaces
Digital routers and switches
Distribution amplifiers
Buffer applications
Set top boxes
Security cameras
Typical Application
30027202
© 2007 National Semiconductor Corporation
300272
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LMH0001 SMPTE 259M / 344M Serial Digital Cable Driver
December 5, 2007
LMH0001
ESD Rating (HBM)
ESD Rating (MM)
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
+150°C
5kV
250V
Recommended Operating
Conditions
Supply Voltage (VCC – VEE):
Operating Free Air Temperature (TA)
+260°C
3.3V ±5%
−40°C to +85°C
+78.9°C/W
+42.7°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
ICC
Supply Current
Conditions
Reference
SDI, SDI
Differential
Min
Typ
1.6 +
VSDI/2
100
SDO, SDO
Max
Units
VCC –
VSDI/2
V
2000
mVP−P
VCC –
VSDO
V
Single-ended, 75Ω load,
RREF = 750Ω 1%
750
800
850
mVP-P
Single-ended, 75Ω load,
RREF = 590Ω 1%
900
1000
1100
mVP-P
38
43
mA
Typ
Max
Units
540
Mbps
(Note 5)
AC Electrical Characteristics
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Note 3).
Symbol Parameter
Conditions
Reference
DRSDI
Input Data Rate
(Note 4)
SDI, SDI
tjit
Additive Jitter
270 Mbps
SDO, SDO
tr,tf
Output Rise Time, Fall Time
20% – 80%
Mismatch in Rise/Fall Time
Duty Cycle Distortion
tOS
RLSDO
Min
psP-P
18
400
800
ps
(Note 4)
30
ps
(Note 4)
100
ps
Output Overshoot
(Note 4)
8
%
Output Return Loss
(Note 6)
15
560
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.
Note 5: Maximum ICC is measured at VCC = +3.465V and TA = +70°C.
Note 6: Output return loss is dependent on board design. The LMH0001 meets this specification on the SD001SQ evaluation board from 5MHz to 1.5GHz.
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2
LMH0001
Connection Diagram
30027205
16-Pin LLP
Order Number LMH0001SQ
See NS Package Number SQB16A
Pin Descriptions
SOIC
Pin #
LLP
Pin #
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).
7
11
SDO
Serial data complement output.
8
12
SDO
Serial data true output.
—
—
Name
5, 6, 7, 8, NC
10, 13, 14,
15, 16
DAP
VEE
Description
No connect.
Connect exposed DAP to negative power supply (ground).
3
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LMH0001
OUTPUT INTERFACING
The LMH0001 uses current mode outputs. Single-ended output 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.
Device Operation
INPUT INTERFACING
The LMH0001 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 VCC = 3.3V. Figure 1 shows the differential input stage for SDI and SDI.
30027204
FIGURE 1. Differential Input Stage for SDI and SDI.
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4
LMH0001
Physical Dimensions inches (millimeters) unless otherwise noted
16-Pin LLP
Order Number LMH0001SQ
NS Package Number SQB16A
5
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LMH0001 SMPTE 259M / 344M Serial Digital Cable Driver
Notes
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