NSC LMH0041SQE 3 gbps, hd, sd, dvb-asi sdi deserializer with loopthrough and lvds interface Datasheet

October 5, 2009
3 Gbps, HD, SD, DVB-ASI SDI Deserializer with
Loopthrough and LVDS Interface
General Description
Key Specifications
The LMH0341/0041/0071/0051 SDI Deserializers are part of
National’s family of FPGA-Attach SER/DES products supporting 5-bit LVDS interfaces with FPGAs. When paired with
a host FPGA the LMH0341 automatically detects the incoming data rate and decodes the raw 5-bit data words compliant
to any of the following standards: DVB-ASI, SMPTE 259M,
SMPTE 292M, or SMPTE 424M. See Table 1 for details on
which Standards are supported per device.
The interface between the LMH0341 and the host FPGA consists of a 5-bit wide LVDS bus, an LVDS clock and an SMBus
interface. No external VCOs or clocks are required. The
LMH0341 CDR detects the frequency from the incoming data
stream, generates a clean clock and transmits both clock and
data to the host FPGA. The LMH0341, LMH0041 and
LMH0071 include a serial reclocked loopthrough with integrated SMPTE compliant cable driver. Refer to table 1 for a
complete listing of single channel deserializers offered in this
family.
The FPGA-Attach SER/DES product family is supported by a
suite of IP which allows the design engineer to quickly develop
video applications using the SER/DES products. The product
is packaged in a physically small 48 pin LLP package.
■ Output compliant with SMPTE 259M-C, SMPTE 292M,
SMPTE 424M and DVB-ASI (See Table 1)
■ Typical power dissipation: 590 mW (loopthrough disabled,
3G datarate)
■ 0.6 UI Minimum Input Jitter Tolerance
Features
■
■
■
■
■
■
■
5–bit LVDS Interface
No external VCO or clock required
Reclocked serial loopthrough with Cable Driver
Powerdown Mode
3.3V SMBus configuration interface
Small 48 pin LLP package
Industrial Temperature range:-40°C to +85°C
Applications
■ SDI interfaces for:
—
—
—
—
Video Cameras
DVRs
Video Switchers
Video Editing Systems
General Block Diagram
30017201
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 2009 National Semiconductor Corporation
300172
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LMH0341, LMH0041, LMH0071, LMH0051 3Gbps, HD, SD, DVB-ASI SDI Deserializer with
Loopthrough and LVDS Interface
LMH0341, LMH0041,
LMH0071, LMH0051
LMH0341, LMH0041, LMH0071, LMH0051
Pin Descriptions
Pin Name
Type
Description
LVDS Input Interface
RX[4:0]+
RX[4:0]-
Output, LVDS
LVDS Data Output Pins
Five channel wide DDR interface.
RXCLK+
RXCLK-
Output, LVDS
LVDS Clock Output Pins
DDR Interface.
RXIN0+
RXIN0-
Input, Differential
Serial differential input Pins
Channel 0
RXIN1+
RXIN1-
Input, Differential
Serial differential input Pins
Channel 1
Serial Data Inputs
Loopthrough Serial Output
TXOUT+
Output, CML
Serial Digital Interface Output Pin
Non-Inverting Output
TXOUT-
Output, CML
Serial Digital Interface Output Pin
Inverting Output
SDA
I/O, LVCMOS
SMBus Data I/O Pin
SCK
Input, LVCMOS
SMBus Clock Input Pin
SMB_CS
Input, LVCMOS
SMBus Chip Select Input Pin
Device is selected when High.
SMBus Interface
Control and Configuration Pins
RESET
Input, LVCMOS
Reset Input Pin
H = normal mode
L = device in RESET
LOCK
Output, LVCMOS
PLL LOCK Status Output
H = unlock condition
L = PLL is Locked
DVB_ASI
Input, LVCMOS
DVB_ASI Select Input
H = DVB_ASI Mode enabled
L = Normal Mode enabled
Loopthru_EN
Input, LVCMOS
Loopthrough enable Input
H=Reclocked Loopthrogh active
L=Reclocked Loopthrough disabled
RX_MUX_SEL
Input, LVCMOS
Input multiplexer select
H=RXIN1 selected
L=RXIN0selected
GPIO[2:0]
I/O, LVCMOS
General Purpose Input / Output
Software configurable I/O pins.
RSVD_H
Input, LVCMOS
Configuration Input – Must tie High
Pull High via 5 kΩ resistor to VDD3V3
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2
Type
Description
RSET
Input
Serial Loopthrough Output Amplitude Control
Resistor connected from this pin to ground to set the signal amplitude. Nominally
7.87kΩ for 800mV output (SMPTE).
LF_CP
Input
Loop Filter Connection
Analog Inputs
LF_REF
Loop Filter Reference
DNC
Do Not Connect – Leave Open
Power Supply and Ground
VDD3V3
Power
3.3V Power Supply connection
VDDPLL
Power
3.3V PLL Power Supply connection
VDD2V5
Power
2.5V Power Supply connection
GND
Ground
Ground connection – The DAP (large center pad) is the primary GND connection
for the device and must be connected to Ground along with the GND pins.
TABLE 1. Feature Table
Device
LMH0341
LMH0041
SMPTE 424M Support SMPTE 292M Support SMPTE 259M Support DVB-ASI Support Active Loopthrough
×
×
×
×
×
×
×
×
×
×
×
×
×
×
LMH0071
LMH0051
×
3
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LMH0341, LMH0041, LMH0071, LMH0051
Pin Name
LMH0341, LMH0041, LMH0071, LMH0051
LVDS Input Voltage
Junction Temperature
Storage Temperature
Lead Temperature—Soldering 4 seconds
Thermal Resistance—
Junction to Ambient—θJA
ESD Rating—Human Body Model,
1.5 KΩ, 100 pF
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (VDD3V3)
Supply Voltage(VDD2V5)
LVCMOS input voltage
LVCMOS output voltage
SMBus I/O Voltage
−0.3V to +4.0V
—0.3V to +3.0V
−0.3V to (VDD3V3+0.3V)
−0.3V to (VDD3V3+0.3V)
—0.3V to +3.6V
0.3V to 3.6V
+150°C
−65° to 150°C
+260°C
26°C/W
≥±8KV
Recommended Operating Conditions
Supply Voltage (VDD3V3-GND)
Parameter
Min
3.135
Typ
3.3
Max
3.465
Units
V
Supply Voltage (VDD2V5-GND)
2.375
2.5
2.625
V
100
mVP-P
−40
+25
+85
102
2970
1485
270
1485
25
°C
°C
Mbps
Mbps
Mbps
Mbps
cm
2.625
Ω
V
Supply noise amplitude (10 Hz to 50 MHz)
Ambient Temperature
Case Temperature
Input Data Rate — LMH0341
Input Data Rate — LMH0041
Input Data Rate — LMH0071
Input Data Rate — LMH0051
LVDS PCB board trace length (mismatch <2%)
RSTERM — SMBus termination resistor value
270
270
270
270
1000
Loopthrough Output Driver Pullup Resistor Termination Voltage
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2.5
4
Over supply and Operating Temperature ranges unless otherwise specified. (Note 2)
Symbol
IDD2.5
Parameter
2.5V supply current for LMH0341,
LMH041, LMH0071
2.5V supply current for LMH0051
IDD3.3
3.3V supply current for LMH0341,
LMH0041, LMH0071
Typ
Max
Units
2.97 Gbps
LT off
Condition
Min
67
77
mA
1.485 Gbps
LT off(Note 9)
52
59
mA
270 Mbps
LT off(Note 9)
40
46
mA
2.97 Gbps
LT on
99
108
mA
1.486 Gbps
LT on(Note 9)
84
92
mA
270 Mbps
LT on(Note 9)
65
71
mA
1.485 Gbps
52
59
mA
270 Mbps
40
46
mA
LT off(Note 9)
106
120
mA
LT on(Note 9)
112
127
mA
106
119
mA
2.97 Gbps, loopthrough enabled
617
710
mW
1.485 Gbps, loopthrough
enabled(Note 9)
580
670
mW
270 Mbps, Loopthrough
enabled(Note 9)
532
620
mW
2.97 Gbps, Loopthrough
Disabled(Note 9)
517
610
mW
1.485 Gbps, Loopthrough
Disabled(Note 9)
480
560
mW
270 Mbps, Loopthrough
Disabled(Note 9)
450
530
mW
3.3V supply current for LMH0051
PD
Power Consumption
Control Pin Electrical Characteristics
Over supply and Operating Temperature ranges unless otherwise specified. Applies to DVB_ASI,RESET and LOCK,GPIO Pins,
RX_MUX_SEL, Loopthru_EN(Note 2)
Symbol
Parameter
Condition
VIH
High Level Input Voltage
VIL
Low Level Input Voltage
VOH
High Level Output Voltage
VOL
Low Level Output Voltage
IOL = 2 mA
VCL
Input Clamp Voltage
ICL = −18 mA
IIN
Input Current
VIN = 0.4V, 2.5V or VDDPullup
and pulldown resistors not
enabled.
IOS
Output Short Circuit Current
VOUT = 0V
Min
Typ
2.0
−0.3
IOH = −0.4 mA
2.7
3.25
IOH = −2 mA
2.7
3.2
Units
V
0.8
V
V
V
0.1
0.3
V
0.9
−1.5
V
40
μA
—40
—44
5
Max
VDD3V3
+0.3
mA
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LMH0341, LMH0041, LMH0071, LMH0051
Electrical Characteristics
LMH0341, LMH0041, LMH0071, LMH0051
SDI Input Electrical Characteristics
Over supply and Operating Temperature ranges unless otherwise specified. (Note 2)
Symbol
Parameter
Condition
Min
Typ
Max
Units
2200
mV
50
µA
116
Ω
VID
Input Differential Voltage
DC Coupled, VCM = 0.05V to
VDD-0.05V(Note 7)
230
IIN
Input Current
0V < VIN < 2.4V
−300
RIT
Input Termination
TOLJIT
Input Jitter Tolerance
0.6
UI
λBW
Jitter Transfer Function
3 dB loop bandwidth
Figure 7
0.13%
Fraction of
Datarate
δ
RL
Jitter Peaking
Figure 7
0.05
dB
Input Return Loss
Measured on 'ALP' evaluation
board(Note 7)
>25dB to
1.5GHz
>12dB to
3 GHz
dB
84
Frequency < f2 (From SMPTE
RP 184)
Frequency <f3
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6
100
6
UI
Over supply and Operating Temperature ranges unless otherwise specified. (Note 2)
Symbol
Parameter
VOD
Differential Output Voltage
ΔVOD
Change in VOD between
complementary output states
VOS
Offset Voltage
ΔVOS
Change in VOS between
complementary output states
IOS
Output Short Circuit Current
Condition
RL = 100Ω
Min
Typ
230
1.125
VOUT = 0V, RL = 100Ω
1.25
Max
Units
310
mV
35
mV
1.375
V
35
mV
—50
mA
LVDS Switching Characteristics
Over supply and Operating Temperature ranges unless otherwise specified. (Note 2)
Symbol
Parameter
Condition
tROTR
LVDS Low to High Transition time
tROTF
LVDS High to Low Transition time
tROCP
Receiver output clock period
tRODC
RxCLKOUT Duty Cycle
tROCH
RxCLKOUT high time
tROCL
RxCLKOUT low time
tRBIT
Receiver output bit width
tDVBC
tDVAC
RX data transition to RXCLK transition See Receiver timing
RXCLK transition to RX data transition specifications(Note 8)
tROJR
Receiver output Random Jitter
Min
See LVDS Switching times
RxCLKOUT is DDR. If divide by
4 is enabled, the output clock
period will be doubled
45
See Receiver timing
specifications
Typ
Max
300
ps
300
ps
2T
ns
50
55
1.51
%
ns
1.51
ns
T
Receiver output intrinsic
random jitter.
Units
ns
650
ps
650
ps
2.5
ps
Bit error rate ≤ 10-15. Alternating
10 pattern. RMS(Note 7)
tROJT
Peak-to-Peak Receiver Output Jitter
(Note 7)
70
tRD
Receiver Propagation Delay
See Receiver (LVDS Interface)
Propagation Delay
tRLA
Receiver Link Acquisition Time
From device reset or change in
input data rate to locked
condition
tLVSK
LVDS Output Skew
LVDS Differential Output Skew
between + and − pins
7
125
ps
24
ms
12 T
20
ps
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LMH0341, LMH0041, LMH0071, LMH0051
LVDS Output Electrical Characteristics
LMH0341, LMH0041, LMH0071, LMH0051
30017202
FIGURE 1. LVDS Switching Times
SMBus Input Electrical Characteristics
Over supply and Operating Temperature ranges unless otherwise specified. (Note 2)
Symbol
Parameter
Condition
VSIL
Data, Clock Input Low Voltage
VSIH
Data, Clock Input High Voltage
VSDD
Nominal Bus Voltage
VOL
Output Low voltage
IOL=2mA
ISLEAKB
Input Leakage per bus segment
ISLEAKP
CSI
Min
Typ
Max
Units
0.8
V
2.1
VSDD
V
2.375
3.465
V
0.3
V
See (Note 3)
−200
200
μA
Input Leakage per pin
SCK and SDA pins
−10
10
μA
Capacitance for SMBdata and
SMBclk
See (Note 3, Note 4)
10
pF
Max
Units
100
kHz
SMBus Switching Characteristics
Over supply and Operating Temperature ranges unless otherwise specified. (Note 2)
Symbol
Parameter
Condition
Min
Typ
fSMB
Bus Operating Frequency
10
tBUF
Bus free time between stop and start
condition
4.7
μs
tSU:CS
Minimum time between SMB_CS
being active and Start condition
(Note 7)
30
ns
tH:CS
Minimum time between stop condition (Note 7)
and releasing SMB_CS
100
ns
tHD:STA
Hold time after (repeated) start
condition. After this period, the first
clock is generated
4.0
μs
tSU:STA
Repeated Start condition setup time
4.7
μs
tSU:STO
Stop Condition setup time
4.0
μs
tHD:DAT
Data hold time
300
ns
tSU:DAT
Data setup time
250
ns
tLOW
Clock Low Period
4.7
tHIGH
Clock high time
4.0
tPOR
Time in which a device must be
operational after power on
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At ISPULLUP = MAX
8
μs
50
μs
500
ms
FIGURE 2. SMBus Timing Parameters
SDI Output Switching Characteristics (LMH0341 / LMH0041 / LMH0071)
Over supply and Operating Temperature ranges unless otherwise specified. (Note 2)
Symbol
Parameter
Condition
SDI Output Datarate
tr
SDI Output Rise Time
SDI Output Fall Time
270
Mismatch between Rise and Fall
times
tSD
Propagation Delay Latency
tJ
Peak to Peak Output Jitter
Max
Units
2970
MHz
135
ps
DR=1.485 Gbps(Note 7)
145
400
1000
DR=2.97 Gbps(Note 7)
135
ps
DR=1.485 Gbps(Note 7)
145
ps
DR = 270 Mbps(Note 7)
Δtt
Typ
DR=2.97 Gbps(Note 7)
DR=270 Mbps(Note 7)
tf
Min
1000
ps
2.97 Gbps(Note 7)
400
25
ps
1.485 Gbps(Note 7)
30
ps
270 Mbps(Note 7)
100
ps
tCIP
ns
2.97 Gbps(Note 7, Note 6)
25
1.485 Gbps(Note 7, Note 6)
35
50
270 Mbps(Note 7, Note 6)
65
110
800
880
VOD
SDI Output Voltage(Loopthrough
Output)
Into 75Ω Load
RL
Output Return Loss
Measured 5 MHz to 1483 MHz
(Note 7)
tOS
Output Overshoot
(Note 7)
720
40
15
mV
dB
5
%
Note 1: “Absolute Maximum Ratings” are the ratings beyond which the safety of the device cannot be guaranteed. It is not implied that the device will operate up
to these limits.
Note 2: Typical Parameters measured at VDD=3.3V, TA=25°C. They are for reference purposes and are not production tested.
Note 3: Recommended value—Parameter is not tested.
Note 4: Recommended maximum capacitance load per bus segment is 400 pF.
Note 5: Maximum termination voltage should be identical to the device supply voltage.
Note 6: Measured in accordance with SMPTE RP184.
Note 7: Specification Guaranteed by characterization
Note 8: Specification Characterized at 2.97 Gbps, 1.485 Gbps and 270 Mbps, production tested at 270 Mbps only
Note 9: Specification Guaranteed by Characterization for LMH0341, other variants production tested
9
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LMH0341, LMH0041, LMH0071, LMH0051
30017205
LMH0341, LMH0041, LMH0071, LMH0051
30017204
FIGURE 3. Receiver (LVDS Interface) Propagation Delay
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10
affect the address register value if the SMBus default address
has been changed.
DEVICE OPERATION
The DES is used in digital video signal origination equipment.
It is intended to be operated in conjunction with an FPGA host
which processes data received by the SER, and converts the
five bit output data to an appropriate parallel video format —
usually 10 or 20 bits wide. In most applications, the input data
to the DES will be data compliant with DVB ASI, SMPTE
259M-C, SMPTE 292M or SMPTE 424M, and the decoding
will be done by the IP provided by National Semiconductor or
similar IP to result in a decoded output. National Semiconductor offers IP in source code format to perform the appropriate decoding of the data, as well as evaluation platforms to
assist in the development of target applications. For more information please contact your local National Semiconductor
Sales Office/Distributor
LVDS OUTPUTS
The DES has LVDS outputs, compatible with ANSI/TIA/
EIA-644. LVDS outputs expect to drive a 100Ω transmission
line which is properly terminated at the host FPGA inputs. It
is recommended that the PCB trace between the FPGA and
the receiver be less than 25 cm. Longer PCB traces may introduce signal degradation as well as channel skew which
could cause serialization errors.
The LVDS outputs on the DES have a programmable output
swing. The default condition is for the smaller size swing, in
order to save power. If a larger amplitude output swing is desired, this can be effected through the use of register 0x27h
LVDS OUTPUT TIMING
The DES output timing, in it's default condition, is described
in the LVDS Switching characteristics table. The user has the
ability to adjust the LVDS output timing to make it easier to
latch into the host FPGA if desired. This is done via register
0x28h where both the clock to data timing may be adjusted,
as well as changing the RXCLK from being a DDR clock to a
clock at the rate of DDR/2
POWER SUPPLIES
The DES has several power supply pins, at 2.5V as well as
3.3V. It is important that these pins all be connected, and
properly bypassed. Bypassing should consist of parallel
4.7μF and 0.1μF capacitors as a minimum, with a 0.1μF capacitor on each power pin. The device has a large contact in
the center of the bottom of the package. This contact must be
connected to the system GND as it is the major ground connection for the device. A 22 μF capacitor is required on the
VDDPLL pin which is connected to the 3.3V rail
Discrete bypassing is ineffective above 30 MHz to 50 MHz in
power plane-based distribution systems. Above this frequency range, the intrinsic capacitance of the power-ground system can be used to provide additional RF bypassing. To make
the best use of this, make certain that there are PCB layers
dedicated to the Power supplies and to GND, and that they
are placed next to each other to provide a distributed capacitance between power and GND.
The DES will work best when powered from linear regulators.
The output of linear regulators is generally cleaner with less
noise than switching regulators. Output filtering and power
system frequency compensation are generally simpler and
more effective with linear regulators. Low dropout linear regulators are available which can usually operate from lower
input voltages such as logic power supplies, thereby reducing
regulator power dissipation. Cascading of low dropout regulators should not be done since this places the entire supply
current load of both load systems on the first regulator in the
cascade and increases its loading and thermal output.
LOOP FILTER
The DES has an internal PLL which is used to recover the
embedded clock from the input data. The loop filter for this
PLL has external components, and for optimum results in
Serial Digital Interface applications, a capacitor and a resistor
in series should be connected between pins 26 and 27 as
shown in the typical interface circuit.
DVB-ASI MODE
DVB-ASI mode is enabled when the DVB-ASI pin is brought
to a high state. When the DVB-ASI mode is enabled, an internal framer and 8b10b decoder is engaged such that the
data appearing on RX0-RX3 will represent a nibble of the decoded 8b10b data. RX4 is an Idle character detect and can
be used as an enable to allow the receiver to not write data
into an external FIFO. RX4 is high if the data being presented
on RX0-RX3 represents the idle character. The Most Significant Nibble of data is presented on the rising edge of RXCLK,
and the least significant on the falling edge of RXCLK.
SDI INPUT INTERFACING
The device has two inputs, one of which is selected via a
multiplexer with the RX_MUX_SEL pin. Whichever input is
selected will be routed to the clock recovery portion of the
deserializer, and once it is reclocked, the signal will be fed to
the loopthrough outputs. Most SDI interfaces require an
equalizer to meet performance requirements. For HD-SDI
and SD-SDI applications, the LMH0044 is an ideal equalizer
to use for this. The LMH0044 is packaged in a small compact
package and the outputs can be connected directly to the
RXIN inputs of the LMH0041. The LMH0344 is pin compatible
with the LMH0044 and will support 3 Gbps data, making it an
ideal choice to accompany the LMH0341.
POWER UP
The 3.3V power supply should be brought up before the 2.5V
supply. The timing of the supply sequencing is not important.
The device has a power on reset sequence which takes place
once both power supplies are brought up. This sequence will
reset all register contents to their default values, and will place
the PLLs into link acquisition mode, attempting to lock on the
RXIN0input.
RESET
There are three ways in which the device may be reset. There
is an automatic reset which happens on power-up; there is a
reset pin, which when brought low will reset the device, with
normal operation resuming when the pin is driven high again.
The third way to reset the device is a soft reset, implemented
via a write to the reset register. This reset will put all of the
register values back to their default values, except it will not
11
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LMH0341, LMH0041, LMH0071, LMH0051
Functional Description
LMH0341, LMH0041, LMH0071, LMH0051
but the typical interface circuit shows values that would be a
good starting point.
30017207
30017206
FIGURE 5. Simplified SDI Output Circuit
FIGURE 4. Simplified SDI Input Circuit
JITTER MANAGEMENT
SMPTE 424M (the 3 Gbps standard) relaxed the requirements of SDI transmitters from 0.2UI to 0.3UI, which means
that the challenge of receiving these signals error free is very
difficult. The parameter of importance to determine if the DES
will be able to receive the signal error free is the Jitter Tolerance. Figure 8 shows the LMH0341 Jitter tolerance curve with
a 2.97 Gbps input — any signal which has less jitter than what
is on the upper curve of this figure will be able to be received
by the DES. The lower line in the curve shows the SMPTE
requirement for any receiver. There is a slight dip in the level
at frequencies abive about 10MHz which is an artifact of the
test equipment that was used to capture the data. Once the
signal is received, the next concern as far as jitter goes is how
much of the jitter that was on the input signal will be passed
through to the RXCLK output. This is answered by the Jitter
transfer characteristics. The Jitter transfer function is the ratio
of the input jitter to the output jitter, measured as a function of
frequency. The specification tables show two of the parameters related to this curve — δ is the jitter peaking and indicates
what the maximum gain of the jitter is. Ideally δ is 0, but a
lower number is better. If several devices are used in a system, and the frequency at which δ is maximum is the same
for all of them, then the gains will multiply, and there is a risk
that there will be excessive jitter accumulating at that frequency. The LMH0341 has very low Jitter peaking, so this
should not be a concern. The other parameter of interest is
λ which is the jitter transfer bandwidth. Jitter on the input at
the frequency λ is attenuated by 3dB, and any jitter at frequencies greater than λ is attenuated by more than this. From
a design standpoint, it means that you primarily only need to
worry about the jitter at frequencies below λ. The LMH0341
adjusts it's loop bandwidth dependent on datarate, so for the
lower datarates, it has a lower loop bandwidth.Figure 8 shows
the jitter transfer curve of an LMH0341 with a 2.97 Gbps signal
input, 0.5UI of input jitter, and nominal power supplies and
temperature.
SWITCHING SDI INPUTS
When the input to the DES is switched from one source to
another, either via the internal 2:1 multiplexor on the inputs,
or via an external crosspoint switch, there are a variety of behaviors possible If the input switch is between two signals
operating at the same datarate, then in most cases, the DES
will not lose lock. There will be a small number of words with
corrupted data as the PLL slews it's phase to match the new
input signal. Under some circumstances (dependent on
phase difference between the inputs, temperature, etc) it is
possible that the PLL will lose lock, and then reacquire lock.
This condition can be seen by monitoring the LOCK pin where
a high going pulse will indicate a loss of lock condition. If a
loss of lock happens, it will be for a time period of approximately 5ms before lock is reattained. In the invent that the
switch on the input is between signals at different datarates
— for example from a 270 Mbps signal to a 1.485 Gbps input,
then the lock procedure is much more complex, and the lock
time will be significantly longer. In either case, the IP that is
processing the received signal will need to reestablish the
proper framing of the words.
SDI OUTPUT INTERFACING
The serial loopthrough outputs provide low-skew complementary or differential signals. The output buffer is a current
mode design, and as such has a high impedance output. To
drive a 75Ω transmission line, a 75Ω resistor from each of the
output pins to VDD2V5 should be connected. This resistor has
two functions—it converts the current output to a voltage,
which is used to drive the cable, and it acts as the back termination resistor for the transmission line. The output driver
automatically adjusts its slew rate depending on the input
datarate so that it will be in compliance with SMPTE 259M,
SMPTE292M or SMPTE 424M as appropriate. In addition to
output amplitude and rise/fall time specifications, the SMPTE
specs require that SDI outputs meet an Output Return Loss
(ORL) specification. There are parasitic capacitances that will
be present both at the output pin of the device and on the
application printed circuit board. To optimize the return loss,
these must be compensated for, usually with a series network
comprising a parallel inductor and resistor. The actual values
for these components will vary from application to application,
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12
Transfer Of Data To The Device Via The SMBus
During normal operation the data on SDA must be stable during the time when SCK is high.
START / STOP / IDLE conditions—
There are three unique states for the SMBus:
START A HIGH to LOW transition on SDA while SCK is high
indicates a message START condition,
STOP A LOW to HIGH transition on SDA while SCK is high
indicates a message STOP condition.
IDLE
If SCK and SDA are both high for a time exceeding
tBUF from the last detected STOP condition or if they
are high for a total exceeding the maximum specification for tHIGH then the bus will transfer to the IDLE
state.
30017221
FIGURE 6. Jitter Tolerance Curve
SMBus Transactions
A transaction begins with the host placing the DES SMBus
into the START condition, then a byte (8 bits) is transferred,
MSB first, followed by a ninth ACK bit. ACK bits are ‘0’ to signify an ACK, or ‘1’ to signify NACK, after this the host holds
the SCL line low, and waits for the receiver to raise the SDA
line as an ACKnowledge that the byte has been received.
30017213
FIGURE 7. Jitter Transfer Curve Parameters
WRITING TO REGISTERS VIA THE SMBus INTERFACE
To write a data value to a register in the DES, the host writes
three bytes, the first byte is the device address—the device
address is a 7 bit value, and if writing to the DES the last bit
(LSB) is set to ‘0’ to signify that the operation is a write. The
second byte written is the register address, and the third byte
written is the data to be written into the addressed register. If
additional data writes are performed, the register address is
automatically incremented. At the end of the write cycle the
host places the bus in the STOP state.
READING FROM REGISTERS VIA THE SMBus
INTERFACE
To read the data value from a register, first the host writes the
device address with the LSB set to a ‘0’ denoting a write, then
the register address is written to the device. The host then
reasserts the START condition, and writes the device address
once again, but this time with the LSB set to a ‘1’ denoting a
read, and following this the DES will drive the SDA line with
the data from the addressed register. The host indicates that
it has finished reading the data by asserting a ‘1’ for the ACK
bit. After reading the last byte, the host will assert a ‘0’ for
NACK to indicate to the DES that it does not require any more
data.
30017220
FIGURE 8. Jitter Transfer Curve
SMBus INTERFACE
The configuration bus conforms to the System Management
Bus (SMBus) 2.0 specification. SMBus 2.0 includes multiple
options. The optional ARP (Address Resolution Protocol) feature is not supported. The I/O rail is 3.3V only and is not 5V
13
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LMH0341, LMH0041, LMH0071, LMH0051
tolerant. The use of the SMB_CS signal is recommended for
applications with multi-drop applications (multiple devices to
a host).
The System Management Bus (SMBus) is a two wire interface
designed for the communication between various system
component chips. By accessing the control functions of the
circuit via the SMBus, pin count is kept to a minimum while
allowing a maximum amount of versatility. The SMBus has
three pins to control it, there is an SMBus CS pin which enables the SMBus interface for the device, a Clock and a Data
line. In applications where there might be several devices, the
SDA and SCK pins can be bussed together and the individual
devices to be communicated with may be selected via the CS
pin The SCL and SDA are both open drain and are pulled high
by external pullup resistors. The DES has several internal
configuration registers which may be accessed via the SMBus. These registers are listed inDES Register Detail Table .
LMH0341, LMH0041, LMH0071, LMH0051
30017215
FIGURE 9. SMBus Configuration 1 — Host to single device
30017216
FIGURE 10. SMBus Configuration 2 — Host to multiple devices with SMB_CS signals
30017217
FIGURE 11. SMBus Configuration 3 — Host to multiple devices with multiple SMBus Interfaces
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14
30017208
FIGURE 12. Simplified LVCMOS Input Circuit
30017209
FIGURE 13. Simplified LVCMOS Output Circuit
POTENTIAL APPLICATIONS FOR GPIO PINS
In addition to being useful debug tools while bringing a DES
design up, there are other practical uses to which the GPIO
pins can be put:
Automatic Switching To Secondary Input If The Signal On
The Primary Input Is Lost
By setting GPIO0 to monitor the status of input0 when there
is a signal present on input 0, the GPIO0 pin will go low when
there is no signal present on the Input0 pin, if this signal is
inverted and then used to drive the RX_MUX_SEL then if the
input on Input0 is lost, the device will automatically switch to
Input1.
Another possible use of the GPIO pins is to provide access to
external signals such as the CD output from an equalizer or
the LOCK output from the DES itself via the SMBus, helping
to minimize the number of connections between the DES and
the FPGA.
15
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LMH0341, LMH0041, LMH0071, LMH0051
GENERAL PURPOSE I/O PINS (GPIO)
The DES has three pins which can be configured to provide
direct access to certain register values via a dedicated pin.
For example if a particular application required fast action to
the condition of the deserializer losing it’s input signal, the
PCLK detect status bit could be routed directly to an external
pin where it might generate an interrupt for the host processor.
GPIO pins can be configured to be in TRI-STATE® (High
Impedance) mode, the buffers can be disabled, and when
used as inputs can be configured with a pullup resistor, a
pulldown resistor or no input pin biasing at all.
Each of the GPIO pins has a register to control it. For each of
these registers, the upper 4 bits are used to define what function is desired of the GPIO pin with options being slightly
different for each of the three GPIO pins. The pins can be
used to monitor the status of various internal states of the
LMH0040 device, to serve as an input from some external
stimulus, and for output to control some external function.
GPIO0 Functions
Allow for the output of a signal programmed by the SMBus
Allow the monitoring of an external signal via the SMBus
Monitor the status of the signal on input 0
GPIO1 Functions
Monitor Power On Reset
Allow for the output of a signal programmed by the SMBus
Allow the monitoring of an external signal via the SMBus
Monitor the status of the signal on input 1
Monitor Lock condition of the input clock recovery PLL
GPIO2 Functions
Allow for the output of a signal programmed by the SMBus
Allow the monitoring of an external signal via the SMBus
Provides a constant clock signal
LVDS TX Clock at 1/20 full rate
CDR Clock at 1/20 full rate
Bits 2 and 3 are used to determine the status of the internal
pullup/pulldown resistors on the device—they are loaded according to the following truth table:
00: pullup and pulldown disabled
01: pulldown enabled
10: pullup enabled
11: reserved
Bit 1 is used to enable or disable the input buffer. If the GPIO
pin is to be used as an output pin, then this bit must be set to
a ‘0’ disabling the output.
The LSB is used to switch the output between normal output
state and high impedance mode. If the GPIO is to be used as
an input pin, this bit must be set to ‘0’ placing the output in
high Z mode.
As an example, if you wanted to use the GPIO0 pin to monitor
the status of the input signal on input 0, you would load register 02h with the value 0010 0001b
LMH0341, LMH0041, LMH0071, LMH0051
Application Information
PCB LAYOUT RECOMMENDATIONS
In almost all applications, the inputs to the DES will be driven
by the output of an equalizer such as the LMH0044. You
should follow the recommendations on the equalizer
datasheet for the interface between the input connector and
the equalizer—the DES will be placed between the equalizer
and the FPGA. If the DES is too close to the equalizer, then
there is a risk of crosstalk between the high speed digital outputs of the DES and the equalizer inputs. Conversely, if too
far away then the interconnect between the equalizer and the
DES may either pick up stray noise, or may broadcast noise
since this is a very high speed signal. Be certain to treat the
signal from the equalizer to the DES as a differential trace. If
there is skew between the two conductors of the differential
trace, not only might this cause difficulties for the DES receive
circuitry, but having a phase difference between the sides of
the pair makes the signal look and radiate like a common
mode signal.
If the loopthrough output is going to be used, it is advised that
the DES be placed close to the Loopthrough output BNC connector, and the equalizer be placed close to the SDI Input
BNC connector. This will minimize the lengths of the most
critical connections.
The DES includes a cable driver for the loopthrough output.
The SMPTE Serial specifications have very stringent requirements for output return loss on drivers. The output return loss
will be degraded by non-idealities in the connection between
the DES and the output connector. All efforts should be taken
to minimize the trace lengths for this area, and to assure that
the characteristic impedance of this trace is 75Ω. The 75Ω
termination resistor should be placed as close to the
loopthrough output pin as is practicable.
It is recommended that the PCB traces between the host
FPGA and the DES be no longer than 10 inches (25cm) and
that the traces be routed as differential pairs, with very tight
matching of line lengths and coupling within a pair, as well as
equal length traces for each of the six pairs.
30017219
FIGURE 14. Evaluation Board Loopthrough Output
Return Loss
TYPICAL SMPTE APPLICATIONS CIRCUIT
A typical application circuit for the DES is shown in Figure
15. This circuit shows the LMH0341 3 Gbps deserializer, alternately this could employ the LMH0041 or LMH0071 deserializers in lower data rate SMPTE applications.
The RX interface between the DES and the host FPGA is
composed of a 5-bit LVDS Data bus and its LVDS clock. This
is a point-to-point interface. Line termination should be provided by the FPGA device. If not, and external 100Ω resistor
maybe used and should be located as close to the FPGA as
possible to minimize stub lengths. Pairs should be of equal
length to minimize any skew impact. The LVDS clock (RXCLK) uses both edges to transfer the data.
An SMBus is also connected from the host FPGA to the DES.
If the SMBus is shared, a chip select signal is used to select
the device being addressed. The SCK and SDA signals require a pull up resistor. The SMB_CS is driven by a GPO
signal from the FPGA. Depending on the FPGA I/O it may also
require a pull up unless it is a push / pull output.
Depending upon the application, several other Host GPIO
signals maybe used. This includes the DVB_ASI and RESET input signals. If these pins are not used, then must be
tied off to the desired state. The LOCK signal maybe used to
monitor the DES. If it is unused, leave the pin as a NC (or
route to a test point).
Note also in this circuit, the LMH0341 GPIO_1 pin has been
configured to provide the status of RXIN_1. When there is a
signal present coming from the LMH0340, then RXIN_1 will
be selected. If that signal is lost, the input MUX will automatically switch over to provide the system reference black signal
as the input from RXIN_0.
The DES includes a SMPTE compliant cable driver for the
Loopthrough function. While this is a differential driver, it is
commonly used single-endedly to drive 75 Ω coax cables.
External 75 Ω pull up resistors are used to the 2.5V rail. The
active output(s) also includes a matching network to meet the
required Output Return Loss SMPTE specification. While application specific, in general a series 75 Ω resistor shunted by
a 6.8 nH inductor will provide a starting value to design with.
The signal is then AC coupled to the cable with a 4.7 µF capacitor. If the complementary output is not used, simply terminate it after its AC coupling capacitor to ground. This output
(even though its inverting) may still be used for a loop back
or 1:2 function due to the nature of the NRZI coding that the
PCB DESIGN DO’S AND DON’TS
DO Whenever possible dedicate an entire layer to each power
supply whenever possible—this will reduce the inductance in
the supply plane.
DO use surface mount components whenever possible.
DO place bypass capacitors close to each power pin.
DON’T create ground loops—pay attention to the cutouts that
are made in your power and ground planes to make sure that
there are not opportunities for loops.
DON’T allow discontinuities in the ground planes—return currents will follow the path of least resistance—for high frequency signals this will be the path of least inductance.
DO place the Loopthrough outputs as close as possible to the
edge of the PCB where it will connect to the outside world.
DO make sure to match the trace lengths of all differential
traces, both between the sides of an individual pair, and from
pair to pair.
DO remember that VIAs have significant inductance—when
using a via to connect to a power supply or ground layer, two
in parallel are better than one.
DO connect the slug on the bottom of the package to a solid
Ground connection. This contact is used for the major GND
connection to the device as well as serving as a thermal via
to keep the die at a low operating temperature.
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16
There are three supply connections (see By Pass discussion
and also Pin Descriptions for recommendations). The two
main supplies are the 3.3V rail and the 2.5V rail. There is also
a 3.3V connection for the PLL circuitry.
There are multiple Ground connections for the device. The
main ground connection for the SER is through the large center DAP pad. This must be connected to ground for proper
device operation. In addition, multiple other inputs are required to be connected to ground as show in the figure and
listed in the Pin Description table.
30017210
FIGURE 15. Typical SMPTE Application Circuit
17
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LMH0341, LMH0041, LMH0071, LMH0051
SMPTE standards require. The output voltage amplitude of
the cable driver is set by the RSET resistor. For single-ended
applications, an 7.87kΩ resistor is connected between this pin
and ground to set the swing to 800mV.
The PLL loop filter is external for the SER. A capacitor is connected between the LF_CP and LF_REF pins. Typical value
is 30 nF.
There are several configuration pins that requiring setting to
the proper level. The RSVD_H pins should be pulled High to
the 3.3V rail with a 5 kΩ resistor. Depending upon the application the DVB_ASI pin may be tied off or driven.
LMH0341, LMH0041, LMH0071, LMH0051
30017218
FIGURE 16. Typical CML Application Circuit (LMH0051)
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18
the following table provides details on the device's configuration registers.
DES Register Detail Table
ADD 'h Name
00
01
02
03
Bits
Field
R/W
Default
Description
device_identifica The seven MSBs of this register define the SMBus address for the device. The default value is 0x58h,
tion
but this may be overwritten. The LSB of this register must always be '0' Note that since the address
is shifted over by one bit, some systems may address the 058h as 'B0h
reset
GPIO_0
Configuration
GPIO_1
Configuration
7:1
device_id
0
reserved
r/w
058h
SMBus Device ID
0
If a '1' is written into the LSB of register 0x01h then the device will do a soft reset, restoring it's internal
state to the same as at powerup with the exception of the contents of register 0x00h, which if modified
will remain unchanged
7:1
reserved
0
sw_rst
r/w
0'b
Software Reset
This register configures GPIO_0. Note, if this pin is to be used as an input, then the output must be
TRI-STATE (bit[0]=’0’) and if used as an output, then the input buffer must be disabled (bit[1]=’0’).
7:4
GPIO_0_mode
[3:0]
r/w
0000'b
0000: GPout register
0001: signal detect 0
all others: reserved
3:2
GPIO_0_ren
[1:0]
r/w
01'b
00: pullup and pulldown disabled
01: pulldown enabled
10: pullup enabled
11: Reserved
1
GPIO_0_sleep
z
r/w
0'b
0: input buffer disabled
1: input buffer enabled
0
GPout0 enable
r/w
1'b
0: output TRI-STATE
1: output enabled
This register configures GPIO_1. Note, if this pin is to be used as an input, then the output must be
TRI-STATE (bit[0]=’0’) and if used as an output, then the input buffer must be disabled (bit[1]=’0’).
7:4
GPIO_0_mode
[3:0]
r/w
0000'b
3:2
GPIO_0_ren
[1:0]
r/w
01'b
00: pullup and pulldown disabled
01: pulldown enabled
10: pullup enabled
11: Reserved
1
GPIO_0_sleep
z
r/w
0'b
0: input buffer disabled
1: input buffer enabled
0
GPout0 enable
r/w
1'b
0: output TRI-STATE
1: output enabled
19
0000: POR
0001: GP_OUT[1]
0010:signal detect 1
0011:cdr_lock
all others: reserved
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LMH0341, LMH0041, LMH0071, LMH0051
Register Descriptions
LMH0341, LMH0041, LMH0071, LMH0051
ADD 'h Name
Bits
04
This register configures GPIO_2. Note, if this pin is to be used as an input, then the output must be
TRI-STATE (bit[0]=’0’) and if used as an output, then the input buffer must be disabled (bit[1]=’0’).
05
GPIO_2
Configuration
GP Input
GP Output
R/W
Default
Description
7:4
GPIO_0_mode
[3:0]
r/w
0000'b
3:2
GPIO_0_ren
[1:0]
r/w
01'b
00: pullup and pulldown disabled
01: pulldown enabled
10: pullup enabled
11: Reserved
1
GPIO_0_sleep
z
r/w
0'b
0: input buffer disabled
1: input buffer enabled
0
GPout0 enable
r/w
1'b
0: output TRI-STATE
1: output enabled
0000: GPout [2]register
0001:Always ON clock
0010: LVDS TX CLK
0011:CDR_CLK
all others: reserved
If any of the GPIO pins are configured as inputs, then reading from this register provides the values
on those input pins
7:3
06
Field
Reserved
2
r
Input data on GPIO 2
1
r
Input data on GPIO 1
0
r
Input data on GPIO 0
If the GPIO ins are configured as General Purpose output pins, then writing to this register has the
effect of transferring the bits in this register to the output buffers of the GPIO pins.
7:3
Reserved
2
r/w
Output data on GPIO 2
1
r/w
Output data on GPIO 1
0
r/w
Output data on GPIO 0
07–0C
Reserved
0D
DVB_ASI Idle_A When in DVB_ASI mode, idle characters are inserted into the datastream when there is no valid data
to transmit. This character is recognized by the receiver. The default character is K28.5 but if desired
that can be redefined via this register pair
0E
DVB_ASI Idle_B DVB_ASI idle character MSBs
7:0
7:2
r/w
83
Data [7:0]
2
Data[9:8]
Reserved
1:0
r/w
0F–1C Reserved
1D
1E-1F
Variant
Reading from this register will return an 8 bit value which indicates which variant of the DES is being
addressed
7:6
Reserved
r
5
Loop through
enable
r
pin value This bit returns the state of the loop-through enable,
and defaults to the same as the state of the
Loopthru_EN pin
4:3
mode
r
pin value Returns a two bit pattern which indicates the state that
the device is in
00,01,10: Standard Video Mode
11: DVB_ASI Mode
2
Reserved
1:0
Variant
r
returns the part type:
00: LMH0341
01: LMH0041/LMH0051
10:LMH0071
11:Reserved
Reserved
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20
Bits
Field
20
7:3
Reserved
2
21
22
Control
DVB_ASI
Override
23–26
Reserved
27
LVDS Control 1
28
29–2A
LVDS Control 2
R/W
Default
Description
Data Order
r/w
0
Determines deserialization order —
0: Expects LSB to be received first
1:Expects MSB to be received first
1
Reset Channel
r/w
0
Writing a '1' to this bit forces a reset of the channel
0
Digital
Powerdown
r/w
0
Writing a '1' to this bit will shut down several of the
digital processing sections of the product to save
power.
This register allows the device to be placed in DVB_ASI mode or standard operation mode
7:5
Reserved
4
RX_MUX_SEL
3:2
Reserved
1:0
DVB_ASI
r/w
0
If enabled by register 22, then this bit will override the
RX_MUX_SEL pin.
r/w
0
00,01,10: Standard Operation
11: DVB_ASI
This register allows the user to control the DVB_ASI and input select functions via the SMBus interface
rather than the pin controls.
7:5
Reserved
4
RX_MUX
Control
Override
3:1
Reserved
0
DVB_ASI
Override
r/w
0
Writing a '1' to this register allows register 21 to control
the state of the input multiplexer — if the bit is set to
'0' then the selection will be determined by the state
of the RX_MUX_SEL pin
Writing a '1' to this register allows register 21 to control
the state of the DVB_ASI Select pin — if the bit is set
to '0' then the selection will be determined by the state
of the DVB_ASI pin if '1' then the contents of register
21 take precidence
This register allows control of the LVDS output pins — using this register individual LVDS outputs can
be enabled or disabled, and the outputs can be switched to high output mode
7
LVDS_VOD
r/w
0
With a '0' the VOD of the LVDS output are as described
in the electrical characteristics table, writing a '1' to
this bit generates a larger VODallowing longer traces
to be driven, and increasing total power dissipation
6
LVDS Control
r/w
0
Writing a '1' to this bit allows the LVDS outputs to be
controlled via the SMBus
5
RXCLK Enable
r/w
0
Enables the RXCLK output driver
4
RX4 Enable
r/w
0
Enables RX4 output driver
3
RX3 Enable
r/w
0
Enables RX3 output driver
2
RX2 Enable
r/w
0
Enables RX2 output driver
1
RX1 Enable
r/w
0
Enables RX1 output driver
0
RX0 Enable
r/w
0
Enables RX0 output driver
More bits allowing control over the LVDS outputs
7
Reserved
6
LVDS Reset
r/w
0
Resets LVDS Block
5
RXCLK Rate
r/w
1
1: RXCLK is a DDR clock
0: RXCLI is at a rate of DDR/2
4
RXCLK Invert
r/w
0
Inverts the polarity of the RXCLK signal
3:2
LVDS Clock
delay
r/w
10'b
1:0
Reserved
Each LSB adds 80ps delay to the RXCLK signal path,
allowing the setup and hold times to be adjusted.
Reserved
21
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LMH0341, LMH0041, LMH0071, LMH0051
ADD 'h Name
LMH0341, LMH0041, LMH0071, LMH0051
ADD 'h Name
Bits
2B
Allows control over the counting of error events on the clock recovery PLL
Event
Configuration
2C
Reserved
2D
Error Monitor
2E
Error Threshold
Error Threshold
Reserved
3B
Data Rate
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Default
Description
Reserved
3
Event Count
Select
r/w
0
0: Select CDR Event counter for reading — events
are counted for a loss of the RXCLK signal, or a loss
of lock
1: Select data event counter
2
Reset CDR
Error Count
r/w
0
Resets CDR Event count
1
Reset Link
Error Count
r/w
0
resets data event counter
0
enable count
r/w
0
enables event counters
Controls Error Monitoring functions
7:5
Reserved
4
Accumulate
Error Count
r/w
0
Enable counting accumulation of errors
3
8b10b error
disable
r/w
0
When set, disables 8b10b errors from being counted,
or from affecting the status of the LOCKpin
2
clear event
count
r/w
0
When set, clears the number of errors in both the
current and previous state of the error count
1
select error
count
r/w
0
Select which error count to display
0: Number of errors in current run
1: Number of errors within the selected timing window
0
Normal Error
Disable
r/w
0
Disable exiting NORMAL state when the number of
errors exceeds the error threshold
0x10h
Error threshold above which the device stops
receiving data and transferring it to the RXOUT pins.
00
Error threshold above which the device stops
receiving data and transferring it to the RXOUT pins.
Sets the error threshold LSBs
Error Threshold
r/w
Sets the error threshold MSBs
Error Threshold
30–3A
R/W
7:4
7:0
2F
Field
r/w
This Register provides information about the rate at which the receive PLL is locked
7
Reserved
6:4
Freq Range
3:0
Reserved
r
111
22
001: 270 Mbps
011: 1.485 Gbps
110: 2.97 Gbps
111: Unlocked
3C
Bits
CDR Lock Status 7:4
3D
Event Status
3E
Error Status 1
Default
Description
Reserved
CDR Lock
r
1: CDR Locked
0: CDR Unlocked
2
Signal Detect
Ch 1
r
1: signal present
1
Signal Detect
Ch 0
r
1: signal present
0
Reserved
Error Counting register
event count
r/w
0
count of errors that caused a loss of the link
r/w
0
Number of errors in the data — LSB
0
Number of errors in the data — MSB
Error Count LSB
7:0
Error Status 2
R/W
3
7:0
3F
Field
Data Error
Count 1
Error Counting Register MSB
7:0
Data Error
Count 2
r/w
23
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LMH0341, LMH0041, LMH0071, LMH0051
ADD 'h Name
LMH0341, LMH0041, LMH0071, LMH0051
Connection Diagrams
30017211
FIGURE 17. Connection Diagram for LMH0341 / LMH0041 / LMH0071
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24
LMH0341, LMH0041, LMH0071, LMH0051
30017212
FIGURE 18. Connection Diagram for LMH0051
25
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LMH0341, LMH0041, LMH0071, LMH0051
Ordering Information
NSID
Speed
Feature
Units per T&R
Package
LMH0341SQ
3G / HD / SD
SMPTE, Loopthrough
1,000
SQA48A
LMH0341SQX
2,500
LMH0341SQE
LMH0041SQ
250
HD / SD
SMPTE, Loopthrough
1,000
LMH0041SQX
2,500
LMH0041SQE
250
LMH0071SQ
SD
SMPTE, Loopthrough
1,000
LMH0071SQX
2,500
LMH0071SQE
250
LMH0051SQ
HD / SD
CML
1,000
LMH0051SQX
2,500
LMH0051SQE
250
www.national.com
26
SQA48A
SQA48A
SQA48A
LMH0341, LMH0041, LMH0071, LMH0051
Physical Dimensions inches (millimeters) unless otherwise noted
48-Lead QFN Plastic Quad Package
NS Package Number SQA48A
27
www.national.com
LMH0341, LMH0041, LMH0071, LMH0051 3Gbps, HD, SD, DVB-ASI SDI Deserializer with
Loopthrough and LVDS Interface
Notes
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