LMH0044
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SNLS216E – APRIL 2006 – REVISED APRIL 2013
LMH0044 SMPTE 292M / 259M Adaptive Cable Equalizer
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FEATURES
DESCRIPTION
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The LMH0044 SMPTE 292M / 259M adaptive cable
equalizer is a monolithic integrated circuit for
equalizing data transmitted over cable (or any media
with similar dispersive loss characteristics). The
equalizer operates over a wide range of data rates
from 125 Mbps to 1.485 Gbps and supports SMPTE
292M, SMPTE 344M and SMPTE 259M.
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2
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SMPTE 292M, SMPTE 344M and SMPTE 259M
Compliant
Supports DVB-ASI at 270 Mbps
Data rates: 125 Mbps to 1.485 Gbps
Equalizes up to 200 Meters of Belden 1694A at
1.485 Gbps or up to 400 meters of Belden
1694A at 270 Mbps
Manual Bypass and Output Mute with a
Programmable Threshold
Single-Ended or Differential Input
50Ω Differential Outputs
Single 3.3V Supply Operation
208 mW Typical Power Consumption with 3.3V
Supply
Replaces the GS1574 and GS1574A
The LMH0044 implements DC restoration to correctly
handle pathological data conditions (DC restoration
may be bypassed for low data rate applications). The
equalizer may be driven in either a single ended or
differential configuration.
Additional features include separate carrier detect
and output mute pins which may be tied together to
mute the output when no signal is present. A
programmable mute reference is provided to mute the
output at a selectable level of signal degradation.
APPLICATIONS
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SMPTE 292M, SMPTE 344M, and SMPTE 259M
Serial Digital Interfaces
Serial Digital Data Equalization and Reception
Data Recovery Equalization
Typical Application
6.8 nH
Coaxial Cable
1 PF
LMH0044 Adaptive
Cable Equalizer
SDI
SDO
SDI
SDO
4.7 PF
75:
Outputs
75:
4.7 PF
1 PF
37.4:
MUTE
MUTE
CD
MUTEREF AEC+
AECBYPASS
1 PF
CD
MUTEREF
BYPASS
1
2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2013, Texas Instruments Incorporated
LMH0044
SNLS216E – APRIL 2006 – REVISED APRIL 2013
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These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings (1) (2)
−0.5V to 3.6V
Supply Voltage
−0.3V to VCC+0.3V
Input Voltage (all inputs)
−65°C to +150°C
Storage Temperature Range
Junction Temperature
+150°C
Lead Temperature (Soldering 4 Sec)
Package Thermal Resistance
+260°C
θJA 16-pin WQFN
+43°C/W
θJC 16-pin WQFN
+9°C/W
ESD Rating (HBM)
8kV
ESD Rating (MM)
(1)
(2)
250V
"Absolute Maximum Ratings" are those parameter values beyond which the life and operation of the device cannot be ensured. 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.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
Recommended Operating Conditions
Supply Voltage (VCC – VEE)
3.3V ±5%
Input Coupling Capacitance
1.0 µF
AEC Capacitor (Connected between AEC+ and AEC-)
1.0 µF
Operating Free Air Temperature (TA)
0°C to +85°C
DC Electrical Characteristics
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (1) (2).
Parameter
VCMIN
Test Conditions
Input Common Mode Voltage
VSDI
Input Voltage Swing
VCMOUT
Output Common Mode Voltage
VSDO
Output Voltage Swing
Reference
Min
SDI, SDI
At LMH0044 input
(3) (4)
720
50Ω load, differential
MUTEREF
MUTEREF Range
CD Output Voltage
Carrier not present
CD
2.6
MUTE
3.0
800
Min to mute outputs
(1)
(2)
(3)
(4)
(5)
2
Supply Current
V
950
750
mVP-P
1.3
V
0.7
V
V
0.4
See (5)
mVP−P
V
V
V
Max to force outputs active
ICC
Units
VCC –
VSDO/2
Carrier present
MUTE Input Voltage
Max
1.9
SDO, SDO
MUTEREF DC Voltage (floating)
Typ
63
0.8
V
77
mA
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.
Typical values are stated for VCC = +3.3V and TA = +25°C.
Specification is ensured by characterization.
The maximum input voltage swing assumes a nonstressing, DC-balance signal; specifically, the SMPTE-recommended color bar test
signal. Pathological or other stressing signals may not be used. This specification is for 0m cable only.
Supply current depends on the amount of cable being equalized. The current is highest for short cable and decreases as the cable
length is increased. Refer to Figure 2 and Figure 3.
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SNLS216E – APRIL 2006 – REVISED APRIL 2013
AC Electrical Characteristics
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (1).
Parameter
BRMIN
Minimum Input Data Rate
BRMAX
Maximum Input Data Rate
Jitter for various Cable Lengths
(with equalizer pathological)
tr,tf
tOS
Test Conditions
Typ
Max
125
Units
Mbps
1485
Mbps
270 Mbps, Belden 1694A,
400 meters (2)
0.2
UI
270 Mbps, Belden 8281,
280 meters (2)
0.2
UI
1.485 Gbps, Belden 1694A,
140 meters (2)
0.25
UI
1.485 Gbps, Belden 8281,
100 meters (2)
0.25
UI
1.485 Gbps, Belden 1694A,
200 meters (2)
0.3
UI
Output Rise Time, Fall Time
20% – 80% (2)
100
220
ps
Mismatch in Rise/Fall Time
See (2)
2
15
ps
Output Overshoot
See (2)
1
5
%
Output Resistance
Single-Ended
RLIN
Input Return Loss
See (4)
RIN
Input Resistance
Single-Ended
(1)
(2)
(3)
(4)
Min
SDI, SDI
ROUT
CIN
Reference
Input Capacitance
SDO, SDO
(3)
SDI, SDI
Single-Ended
15
(3)
50
Ω
18-20
dB
1.3
kΩ
1
pF
Typical values are stated for VCC = +3.3V and TA = +25°C.
Specification is ensured by characterization.
Specification is ensured by design.
Input return loss is dependent on board design. The LMH0044 meets this specification on the SD044 evaluation board from 5 MHz to
1.5 GHz.
SDI
3
VEE
4
CD
MUTE
VCC
13
LMH0044
(top view)
5
6
7
8
MUTEREF
2
14
BYPASS
SDI
15
AEC-
1
16
AEC+
VEE
VCC
Connection Diagram
12
VEE
11
SDO
10
SDO
9
VEE
The exposed die attach pad is a negative electrical terminal for this device. It should be connected to the negative
power supply voltage.
Figure 1. 16-Pin WQFN Package
See Package Number RUM0016A
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LMH0044
SNLS216E – APRIL 2006 – REVISED APRIL 2013
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Table 1. Pin Descriptions
Pin No.
Name
Description
1
VEE
Negative power supply (ground).
2
SDI
Serial data true input.
3
SDI
Serial data complement input.
4
VEE
Negative power supply (ground).
5
AEC+
AEC loop filter external capacitor (1µF) positive connection.
6
AEC-
AEC loop filter external capacitor (1µF) negative connection.
7
BYPASS
Bypasses equalization and DC restoration when high. No equalization occurs in this mode.
8
MUTEREF
Mute reference. Sets the threshold for CD and (with CD tied to MUTE) determines the maximum cable
to be equalized before muting. MUTEREF may be unconnected for maximum equalization.
9
VEE
Negative power supply (ground).
10
SDO
Serial data complement output.
11
SDO
Serial data true output.
12
VEE
Negative power supply (ground).
13
VCC
Positive power supply (+3.3V).
14
MUTE
Output mute. To disable the mute function and enable the output, MUTE must be tied to GND or a low
level signal. To force the outputs to a muted state, tie to VCC. CD may be tied to this pin to inhibit the
output when no input signal is present. MUTE has no function in BYPASS mode.
15
CD
Carrier detect. CD is high when no signal is present. CD has no function in BYPASS mode.
16
VCC
Positive power supply (+3.3V).
DAP
VEE
Connect exposed DAP to negative power supply.
Block Diagram
BYPASS
Output
Driver
SDI
SDI
DC
Restoration/
Level Control
Equalizer
Filter
Energy
Detect
SDO
SDO
Energy
Detect
6
Automatic
Equalization
Control
Carrier
Detect/
Mute
CD
MUTE
MUTEREF
AEC+
4
AEC-
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SNLS216E – APRIL 2006 – REVISED APRIL 2013
Device Operation
BLOCK DESCRIPTION
The Equalizer Filter block is a multi-stage adaptive filter. If Bypass is high, the equalizer filter is disabled.
The DC Restoration / Level Control block receives the differential signals from the equalizer filter block. This
block incorporates a self-biasing DC restoration circuit to fully DC restore the signals. If Bypass is high, this
function is disabled.
The signals before and after the DC Restoration / Level Control block are used to generate the Automatic
Equalization Control (AEC) signal. This control signal sets the gain and bandwidth of the equalizer filter. The
loop response in the AEC block is controlled by an external 1µF capacitor placed across the AEC+ and AECpins.
The Carrier Detect / Mute block generates the carrier detect signal and controls the mute function of the output.
This block utilizes the CD and MUTE signals along with Mute Reference (MUTEREF).
The Output Driver produces SDO and SDO.
MUTE REFERENCE (MUTEREF)
The mute reference sets the threshold for CD and (with CD tied to MUTE) determines the amount of cable to
equalize before automatically muting the outputs. This is set by applying a voltage inversely proportional to the
length of cable to equalize. As the applied MUTEREF voltage is increased, the amount of cable that can be
equalized before carrier detect is de-asserted and the outputs are muted is decreased. MUTEREF may be left
unconnected for maximum equalization before muting.
CARRIER DETECT (CD) AND MUTE
Carrier detect CD indicates if a valid signal is present at the LMH0044 input. If MUTEREF is used, the carrier
detect threshold will be altered accordingly. CD provides a high voltage when no signal is present at the
LMH0044 input. CD is low when a valid input signal is detected.
MUTE can be used to manually mute or enable SDO and SDO. Applying a high input to MUTE will mute the
LMH0044 outputs. Applying a low input will force the outputs to be active.
CD and MUTE may be tied together to automatically mute the output when no input signal is present.
INPUT INTERFACING
The LMH0044 accepts either differential or single-ended input. The input must be AC coupled. Transformer
coupling is not supported.
The LMH0044 correctly handles equalizer pathological signals for standard definition and high definition serial
digital video, as described in SMPTE RP 178 and RP 198, respectively.
OUTPUT INTERFACING
The SDO and SDO outputs are internally loaded with 50Ω. They produce a 750 mVP-P differential output, or a
375 mVP-P single-ended output.
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LMH0044
SNLS216E – APRIL 2006 – REVISED APRIL 2013
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APPLICATION INFORMATION
PCB LAYOUT RECOMMENDATIONS
Refer to the following Application Note on TI's website: AN-1372, “LMH0034 PCB Layout Techniques.” The PCB
layout techniques in the application note apply to the LMH0044 as well.
REPLACING THE GENNUM GS1574A
The LMH0044 is footprint compatible with the Gennum GS1574A.
SUPPLY CURRENT VS. CABLE LENGTH
The supply current (ICC) depends on the amount of cable being equalized. The current is highest for short cable
and decreases as the cable length is increased. Figure 2 shows supply current vs. Belden 1694A cable length for
1.485 Gbps data and Figure 3 shows supply current vs. Belden 1694A cable length for 270 Mbps data.
SUPPLY CURRENT (mA)
75
70
65
60
55
0
50
100
150
200
BELDEN 1694A CABLE LENGTH (m)
Figure 2. Supply Current vs. Belden 1694A Cable Length, 1.485 Gbps
6
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LMH0044
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SNLS216E – APRIL 2006 – REVISED APRIL 2013
SUPPLY CURRENT (mA)
75
70
65
60
55
0
100
200
300
400
BELDEN 1694A CABLE LENGTH (m)
Figure 3. Supply Current vs. Belden 1694A Cable Length, 270 Mbps
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LMH0044
SNLS216E – APRIL 2006 – REVISED APRIL 2013
www.ti.com
REVISION HISTORY
Changes from Revision D (April 2013) to Revision E
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8
Page
Changed layout of National Data Sheet to TI format ............................................................................................................ 7
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PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
LMH0044SQ/NOPB
ACTIVE
WQFN
RUM
16
1000
RoHS & Green
SN
Level-1-260C-UNLIM
0 to 85
L044
LMH0044SQE/NOPB
ACTIVE
WQFN
RUM
16
250
RoHS & Green
SN
Level-1-260C-UNLIM
0 to 85
L044
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of