MAX3812USA ,Multirate SMPTE SD/HD Cable Driver with Selectable Slew RateApplications♦ 0°C to +85°C Operating Temperature RangeSMPTE 292M, SMPTE 344M, SMPTE 259M, andDVB-AS ..
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MAX739CPD ,-5V,-12V,-15V, and Adjustable Inverting Current-Mode PWM RegulatorslVI/lXI/VI
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The MAX736/MAX737/MAX739/MAX759 are CMOS, in-
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..
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MAX3812USA
Multirate SMPTE SD/HD Cable Driver with Selectable Slew Rate
General DescriptionThe MAX3812 is a multirate SMPTE cable driver
designed to operate at data rates up to 1.485Gbps,
driving one or two 75Ωcoaxial cables. Two selectable
slew rates are provided for compliance to SMPTE 292M,
SMPTE 344M, and SMPTE 259M. The MAX3812 is pin
compatible with the Gennum GS1528.
The MAX3812 inputs are internally biased and compatible
with differential swings of CML, LVPECL, and LVDS.
Output voltage swing is adjustable with a single
external resistor.
The MAX3812 operates over a 0°C to +85°C temperature
range. It typically consumes 106mW with a +3.3V power
supply and is available in an 8-pin SO package.
ApplicationsSMPTE 292M, SMPTE 344M, SMPTE 259M, and
DVB-ASI Coaxial Cable Serial Digital Interfaces
Professional Digital Video Switchers and Routers
Professional Digital Video Cameras and
Recording Devices
FeaturesSMPTE 292M, SMPTE 344M, SMPTE 259M, and
DVB-ASI Compliant106mW Power Consumption Using a +3.3V Power
SupplySmooth Rise/Fall Transitions for Low EMISelectable Slew Rate for HD and SD RatesPin Compatible with Gennum GS1528Dual Coaxial Cable Driving OutputsAdjustable Output Voltage SwingInput Compatibility with Differential Swings of
CML, LVPECL, and LVDS0°C to +85°C Operating Temperature Range
MAX3812
Multirate SMPTE SD/HD Cable Driver
with Selectable Slew RateSD/HD
VCCRSET
OUT+
OUT-IN-
GND
IN+
TOP VIEW
MAX3812
Pin Configuration
Ordering InformationMAX3812
+3.3V
+3.3V
+3.3V
MAX3811†
MULTIRATE
SMPTE
RECLOCKER
50Ω
50Ω
75Ω
75Ω
TRACE
TRACE
CABLE
CABLE
10nF
10nF
4.7μF
10nF
4.7μF75Ω
75Ω
75Ω
75Ω
6.8nH*
6.8nH*
*TYPICAL VALUE VARIES WITH LAYOUT.
IN-
IN+
OUT-
OUT+
RSETGND
VCC
SD/HD
RSET
750ΩFUTURE PRODUCT
CML50Ω
50Ω
Typical Application Circuit19-3571; Rev 0; 2/05
+Denotes lead-free package. Contact factory for availability.
EVALUATION KITAVAILABLE
PARTTEMP RANGEPIN-PACKAGEMAX3812USA0°C to +85°C8 SO
MAX3812USA+0°C to +85°C8 SO
MAX3812
Multirate SMPTE SD/HD Cable Driver
with Selectable Slew Rate
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS(VCC= +3.0V to +3.6V, TA= 0°C to +85°C. Typical values are at VCC= +3.3V, TA= +25°C, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage (VCC)............................................-0.5V to +4.0V
Voltage at IN+, IN-, RSET, SD/HD,
OUT+, OUT-...........................................-0.5V to (VCC+ 0.5V)
Continuous Power Dissipation (TA= +85°C)
8-Pin SO (derate 5.9mW/°C above +85°C)..................384mW
Storage Temperature Range.............................-55°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYM B O L CONDITIONSMINTYPMAXUNITSSupply CurrentICCRSET = 750Ω3245mA
Power ConsumptionRSET = 750Ω106mW
Output Common-Mode VoltageVCMOUTFigure 1, AC-coupled outputVCC -
VOUTV
Input Common-Mode VoltageVCMINFigure 11.6 +
VINDIFF / 4
VCC -
VINDIFF / 4V
SD/HD Input-High VoltageVIH2.0V
SD/HD Input-Low VoltageVIL0.8V
SD/HD Input-High CurrentIIH2.0V ≤ VSD/HD ≤ VCC-110-40µA
SD/HD Input-Low CurrentIIL0V ≤ VSD/HD ≤ 0.8V-150-90µA
AC ELECTRICAL CHARACTERISTICS(VCC= +3.0V to +3.6V, TA= 0°C to +85°C. Typical values are at VCC= +3.3V, TA= +25°C, unless otherwise noted.)
PARAMETERSYM B O L CONDITIONSMINTYPMAXUNITSSerial Input Data Rate191485Mb/s
60Hz ≤ fNOISE ≤ 27MHz100Supply-Noise Tolerance27MHz < fNOISE ≤ 1.5GHz40mVP-P
1.485Gb/0.030.05
540Mb/s0.040.07Total Intrinsic Jitter (Notes 1, 2)TJ
19Mb/s, 143Mb/s, 177Mb/s, 270Mb/s,
360Mb/s0.020.05
UIP-P
20% to 80%, SD/HD = low145220Output Rise/Fall Timetr, tf20% to 80%, SD/HD = high450675750ps
Mismatch in Rise/Fall Time(Notes 1, 3)530ps
Duty-Cycle Distortion(Notes 1, 3)2ps
Output Return Loss5MHz to 1.485GHz (Note 4)19dB
Single-ended, RSET = 750Ω, Figure 1750800850
Single-ended, RSET = 570Ω, Figure 11050Output Voltage SwingVOUT
Single-ended, RSET = 1000Ω, Figure 1600
mVP-P
Input Voltage SwingVINDIFFDifferential, Figure 13002000mVP-P
Input Rise/Fall Time20% to 80% (Note 5)230ps
MAX3812
Multirate SMPTE SD/HD Cable Driver
with Selectable Slew Rate
Note 1:Guaranteed by design and characterization.
Note 2:Total intrinsic jitter is defined as the summation of deterministic jitter (DJ) and random jitter (RJ) using the formula:
TJ(UIP-P) = DJ(UIP-P) + 14.1 x RJ(UIRMS)
Note 3:Measured at 1.485Gb/s using a 0011 pattern.
Note 4:See the Output Return Loss graph in the Typical Operating Characteristics.
Note 5:Input signals must reach the full amplitude levels within the unit interval.
AC ELECTRICAL CHARACTERISTICS (continued)(VCC= +3.0V to +3.6V, TA= 0°C to +85°C. Typical values are at VCC= +3.3V, TA= +25°C, unless otherwise noted.)
Typical Operating Characteristics(VCC= +3.3V, TA= +25°C, RSET= 750Ω, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATUREMAX3812 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (mA)70506020304010
SD/HD = LOW
SD/HD = HIGH
OUTPUT EYE DIAGRAM
(270Mb/s, SD/HD = HIGH)MAX3812 toc02
0.8VP-P
620ps/div
USING TYPICAL APPLICATION CIRCUIT
OUTPUT EYE DIAGRAM
(1.485Gb/s, SD/HD = LOW)MAX3812 toc03
0.8VP-P
112ps/div
USING TYPICAL APPLICATION CIRCUIT
150mVP-P MIN
1000mVP-P MAX
300mVP-P MIN
2000mVP-P MAX
800mVP-P
(RSET = 750Ω)
VIN+
VCMIN
VINDIFF = (VIN+) - (VIN-)
VOUT+
VCMOUT
VOUT-
VIN-
INPUT
VOLTAGE
OUTPUT
VOLTAGE
TIME
Figure 1. Definition of Input and Output Voltage
MAX3812
Multirate SMPTE SD/HD Cable Driver
with Selectable Slew Rate
Typical Operating Characteristics (continued)(VCC= +3.3V, TA= +25°C, RSET= 750Ω, unless otherwise noted.)
TOTAL INTRINSIC JITTER
vs. TEMPERATUREMAX3812 toc07
TEMPERATURE (°C)
TOTAL INTRINSIC JITTER (UI
P-P70102030504060
270Mb/s
1.485Gb/s540Mb/s
TOTAL INTRINSIC JITTER
vs. INPUT VOLTAGE SWINGMAX3812 toc08
INPUT VOLTAGE SWING (mVP-P)
TOTAL INTRINSIC JITTER (UI
P-P
270Mb/s
1.485Gb/s
540Mb/s
DUTY-CYCLE DISTORTION
vs. TEMPERATUREMAX3812 toc09
TEMPERATURE (°C)
DUTY-CYCLE DISTORTION (ps)70605040302010
0011 PATTERN
270Mb/s
1.485Gb/s
DUTY-CYCLE DISTORTION
vs. INPUT VOLTAGE SWINGMAX3812 toc10
INPUT VOLTAGE SWING (mVP-P)
DUTY-CYCLE DISTORTION (ps)
0011 PATTERN
270Mb/s
1.485Gb/s
OUTPUT VOLTAGE SWING vs. RSETMAX3812 toc04
RSET (Ω)
OUTPUT VOLTAGE SWING (mV
P-P
OUTPUT VOLTAGE SWING
vs. TEMPERATURE
MAX3812 toc05
TEMPERATURE (°C)
OUTPUT VOLTAGE SWING (mV
P-P70506020304010
OUTPUT RETURN LOSS
MAX3812 toc06
FREQUENCY (GHz)
S22 (dB)
LOGIC-HIGH
(VCC - 0.4V)
USING TYPICAL APPLICATION CIRCUIT
LOGIC-LOW
(VCC - 1.2V)
Detailed DescriptionThe MAX3812 is a multirate SMPTE cable driver
designed to drive 75Ωcoaxial cable for serial digital
interfaces. The driver consists of a differential input
buffer, slew-rate selection switch, output-voltage-swing
control, and a differential output buffer (Figure2).
Differential Data InputsThe MAX3812 data inputs (IN+, IN-) are high impedance
and should be terminated as shown in the Typical
Application Circuit. When properly terminated, the inputs
are compatible with differential swings of CML, LVPECL,
and LVDS. For more information about logic interfacing,
refer to Maxim application note HFAN-01.0: Introduction
to LVDS, PECL, and CML.
While DC-coupled, the MAX3812 operates properly as
long as the specified common-mode voltage and differ-
ential voltage swings are met. Because of the on-chip
biasing network (Figure3), the inputs self-bias to the
proper operating point to accommodate AC-coupling. If
the inputs are AC-coupled, a minimum capacitor value
of 4.7µF should be used to accommodate SMPTE
pathological test signals.
MAX3812
Multirate SMPTE SD/HD Cable Driver
with Selectable Slew Rate
Pin Description
PINNAMEFUNCTIONIN+Positive Data InputIN-Negative Data InputGNDSupply GroundRSETOutput-Voltage-Swing Control. Connect a resistor between RSET and VCC to set the output
voltage swing.
5VCC+3.3V Supply VoltageSD/HDOutput Slew-Rate Control, LVTTL. Set HIGH for SMPTE 259M/344M rise/fall specifications. Set LOW
for SMPTE 292M rise/fall specifications.OUT-Negative Data OutputOUT+Positive Data Output
MAX3812BANDGAP REFERENCE
AND BIASING CIRCUIT
RSET
SD/HD
IN+
IN-
OUT+
OUT-
Figure 2. Functional Diagram
MAX3812
VCC
VCC
VCC
VCC
IN-IN+
5kΩ
10kΩ
10kΩ10kΩ
ESD
STRUCTURES
ESD
STRUCTURES
Figure 3. Differential Input Circuit
MAX3812
Slew-Rate Selection SwitchThe MAX3812 output has a selectable slew-rate in
order to achieve compliance to SMPTE 259M/344M
and SMPTE 292M. Output slew rate is selected with the
SD/HDinput (Figure4). The SD/HDpin must be set
high for SMPTE 259M/344M standards and low for
SMPTE 292M standards.
Differential Data OutputsThe MAX3812 differential data outputs are current-mode
logic, CML (Figure5). Each side of the differential output
will drive 800mVP-Pinto a doubly terminated 75Ωtrans-
mission line (RSET= 750Ω).
The cable driver output must have a source impedance
of 75Ωand a return loss of at least 15dB between 5MHz
and 1.485GHz to comply with the SMPTE 259M, SMPTE
344M, and SMPTE 292M standards. In order to meet the
return loss specification, the output network shown in
the Typical Application Circuitis recommended.
The value of the output inductor is typically 6.8nH, but the
value will vary depending on PC board layout. If the out-
puts are AC-coupled, a minimum capacitor value of 4.7µF
should be used to accommodate SMPTE pathological
test signals.
When measuring output return loss, it is necessary to take
the measurement for both a logic-high and logic-low
state. This is due to the output capacitance being slightly
dependent on the logic state. See the Output Return Loss
graph in the Typical Operating Characterisitics.
Output Voltage Swing ControlThe external RSETresistor connected between VCCand
the RSET pin controls the output voltage swing (Figure5).
Typically the output voltage swing is set to 800mVP-P
using a value of 750Ω. For output voltage swings other
than 800mVP-P,see the graph Output Voltage Swing vs.
RSETgiven in the Typical Operating Characteristics.
Using RSETvalues below 500Ωis not recommended.
The RSETresistor should be placed as close as possible
to the RSET pin and the capacitance at this node should
be minimized.
Applications Information
Layout ConsiderationsUse controlled-impedance transmission lines to interface
with the MAX3812 high-speed inputs and outputs.
Power-supply decoupling capacitors should be placed
as close as possible to the VCCconnections. To support
a 75Ωtransmission-line environment at the outputs, it is
necessary to minimize the parasitic capacitance by
removing the PC board ground plane from under the out-
put pins and output components. Transmission line
stubs associated with BNC connectors should be mini-
mized. Edge-mount BNC connectors are recommended.
Multirate SMPTE SD/HD Cable Driver
with Selectable Slew RateVCC
SD/HD
ESD
STRUCTURES
VCCVCC
40kΩ
5kΩ
MAX3812
Figure 4. Slew-Rate Selection Switch
