MAX3812USA [ROCHESTER]
SPECIALTY CONSUMER CIRCUIT, PDSO8, 0.150 INCH, MS-012AA, SOP-8;
| 型号： | MAX3812USA |
| 厂家： | 
Rochester Electronics |
| 描述： | SPECIALTY CONSUMER CIRCUIT, PDSO8, 0.150 INCH, MS-012AA, SOP-8 光电二极管 商用集成电路 |
| 文件： | 总9页 (文件大小：871K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3571; Rev 0; 2/05
Multirate SMPTE SD/HD Cable Driver
with Selectable Slew Rate
General Description
Features
The MAX3812 is a multirate SMPTE cable driver
designed to operate at data rates up to 1.485Gbps,
driving one or two 75Ω coaxial 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.
♦ SMPTE 292M, SMPTE 344M, SMPTE 259M, and
DVB-ASI Compliant
♦ 106mW Power Consumption Using a +3.3V Power
Supply
♦ Smooth Rise/Fall Transitions for Low EMI
♦ Selectable Slew Rate for HD and SD Rates
♦ Pin Compatible with Gennum GS1528
♦ Dual Coaxial Cable Driving Outputs
♦ Adjustable Output Voltage Swing
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.
♦ Input Compatibility with Differential Swings of
CML, LVPECL, and LVDS
Applications
♦ 0°C to +85°C Operating Temperature Range
Pin Configuration
TOP VIEW
SMPTE 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
IN+
IN-
1
2
3
4
8
7
6
5
OUT+
OUT-
Ordering Information
MAX3812
GND
RSET
SD/HD
PART
TEMP RANGE
0°C to +85°C
0°C to +85°C
PIN-PACKAGE
8 SO
MAX3812USA
MAX3812USA+
V
CC
8 SO
+Denotes lead-free package. Contact factory for availability.
SO
Typical Application Circuit
6.8nH*
+3.3V
10nF
CABLE
4.7µF
75Ω
TRACE
75Ω
50Ω
V
CC
10nF
75Ω
75Ω
50Ω
+3.3V
MAX3811†
10nF
IN+
OUT+
OUT-
CML
MULTIRATE
SMPTE
50Ω
IN-
RECLOCKER
TRACE
MAX3812
CABLE
4.7µF
75Ω
50Ω
75Ω
SD/HD
6.8nH*
GND
RSET
†
FUTURE PRODUCT
R
SET
750Ω
+3.3V
*TYPICAL VALUE VARIES WITH LAYOUT.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Multirate SMPTE SD/HD Cable Driver
with Selectable Slew Rate
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V ) ............................................-0.5V to +4.0V
Continuous Power Dissipation (T = +85°C)
A
CC
Voltage at IN+, IN-, RSET, SD/HD,
OUT+, OUT- ...........................................-0.5V to (V
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
+ 0.5V)
CC
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.
DC ELECTRICAL CHARACTERISTICS
(V
= +3.0V to +3.6V, T = 0°C to +85°C. Typical values are at V
= +3.3V, T = +25°C, unless otherwise noted.)
CC A
CC
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
32
MAX
UNITS
mA
Supply Current
I
R
R
= 750Ω
= 750Ω
45
CC
SET
Power Consumption
106
mW
SET
V
V
-
CC
Output Common-Mode Voltage
Input Common-Mode Voltage
V
Figure 1, AC-coupled output
Figure 1
V
V
CMOUT
OUT
1.6 +
INDIFF
2.0
V
-
CC
V
CMIN
V
/ 4
V
/ 4
INDIFF
SD/HD Input-High Voltage
SD/HD Input-Low Voltage
SD/HD Input-High Current
SD/HD Input-Low Current
V
V
IH
V
0.8
V
IL
I
2.0V ≤ V
≤ V
CC
-110
-150
-40
-90
µA
µA
IH
SD/HD
I
0V ≤ V
≤ 0.8V
IL
SD/HD
AC ELECTRICAL CHARACTERISTICS
(V
= +3.0V to +3.6V, T = 0°C to +85°C. Typical values are at V
= +3.3V, T = +25°C, unless otherwise noted.)
CC A
CC
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Serial Input Data Rate
19
1485
Mb/s
60Hz ≤ f
≤ 27MHz
100
40
NOISE
Supply-Noise Tolerance
mV
P-P
27MHz < f
1.485Gb/
540Mb/s
≤ 1.5GHz
NOISE
0.03
0.04
0.05
0.07
Total Intrinsic Jitter (Notes 1, 2)
Output Rise/Fall Time
TJ
UI
P-P
19Mb/s, 143Mb/s, 177Mb/s, 270Mb/s,
360Mb/s
0.02
0.05
20% to 80%, SD/HD = low
20% to 80%, SD/HD = high
(Notes 1, 3)
145
675
5
220
750
30
t , t
r
ps
f
450
Mismatch in Rise/Fall Time
Duty-Cycle Distortion
Output Return Loss
ps
ps
dB
(Notes 1, 3)
2
5MHz to 1.485GHz (Note 4)
19
Single-ended, R
Single-ended, R
Single-ended, R
= 750Ω, Figure 1
= 570Ω, Figure 1
= 1000Ω, Figure 1
750
300
800
1050
600
850
SET
SET
SET
Output Voltage Swing
V
mV
OUT
P-P
Input Voltage Swing
Input Rise/Fall Time
V
Differential, Figure 1
20% to 80% (Note 5)
2000
230
mV
INDIFF
P-P
ps
2
_______________________________________________________________________________________
Multirate SMPTE SD/HD Cable Driver
with Selectable Slew Rate
AC ELECTRICAL CHARACTERISTICS (continued)
(V
= +3.0V to +3.6V, T = 0°C to +85°C. Typical values are at V
= +3.3V, T = +25°C, unless otherwise noted.)
CC A
CC
A
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(UI ) = DJ(UI ) + 14.1 x RJ(UI
)
RMS
P-P
P-P
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.
V
IN+
INPUT
VOLTAGE
150mV MIN
P-P
V
CMIN
1000mV MAX
P-P
V
IN-
300mV MIN
P-P
V
= (V ) - (V )
IN+ IN-
INDIFF
2000mV MAX
P-P
V
OUT+
800mV
P-P
(R = 750Ω)
SET
OUTPUT
VOLTAGE
V
CMOUT
V
OUT-
TIME
Figure 1. Definition of Input and Output Voltage
Typical Operating Characteristics
(V
= +3.3V, T = +25°C, R
= 750Ω, unless otherwise noted.)
SET
CC
A
OUTPUT EYE DIAGRAM
(270Mb/s, SD/HD = HIGH)
OUTPUT EYE DIAGRAM
(1.485Gb/s, SD/HD = LOW)
SUPPLY CURRENT vs. TEMPERATURE
MAX3812 toc02
MAX3812 toc03
100
USING TYPICAL APPLICATION CIRCUIT
USING TYPICAL APPLICATION CIRCUIT
90
80
70
60
50
40
30
20
10
0
0.8V
0.8V
P-P
P-P
SD/HD = LOW
SD/HD = HIGH
620ps/div
112ps/div
0
10 20 30 40 50 60 70 80 90
TEMPERATURE (°C)
_______________________________________________________________________________________
3
Multirate SMPTE SD/HD Cable Driver
with Selectable Slew Rate
Typical Operating Characteristics (continued)
(V
= +3.3V, T = +25°C, R
= 750Ω, unless otherwise noted.)
SET
CC
A
OUTPUT VOLTAGE SWING
vs. TEMPERATURE
OUTPUT VOLTAGE SWING vs. R
OUTPUT RETURN LOSS
SET
1200
900
880
860
840
820
800
780
760
740
720
700
0
-5
USING TYPICAL APPLICATION CIRCUIT
1150
1100
1050
1000
950
-10
-15
-20
-25
-30
-35
-40
LOGIC-HIGH
(V - 0.4V)
CC
900
850
800
LOGIC-LOW
(V - 1.2V)
750
CC
700
650
600
500
600
700
R
800
(Ω)
900
1000
0
10 20 30 40 50 60 70 80 90
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
FREQUENCY (GHz)
TEMPERATURE (°C)
SET
TOTAL INTRINSIC JITTER
vs. TEMPERATURE
TOTAL INTRINSIC JITTER
vs. INPUT VOLTAGE SWING
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
540Mb/s
1.485Gb/s
540Mb/s
1.485Gb/s
270Mb/s
270Mb/s
0
10 20 30 40 50 60 70 80 90
0
400
800
1200
1600
2000
TEMPERATURE (°C)
INPUT VOLTAGE SWING (mV
)
P-P
DUTY-CYCLE DISTORTION
vs. INPUT VOLTAGE SWING
DUTY-CYCLE DISTORTION
vs. TEMPERATURE
30
25
20
15
10
5
30
25
20
15
10
5
0011 PATTERN
0011 PATTERN
270Mb/s
270Mb/s
1.485Gb/s
1.485Gb/s
0
0
0
400
800
1200
1600
2000
0
10 20 30 40 50 60 70 80 90
INPUT VOLTAGE SWING (mV
)
P-P
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Multirate SMPTE SD/HD Cable Driver
with Selectable Slew Rate
Pin Description
PIN
1
NAME
IN+
FUNCTION
Positive Data Input
2
IN-
Negative Data Input
3
GND
Supply Ground
Output-Voltage-Swing Control. Connect a resistor between RSET and V
voltage swing.
to set the output
CC
4
5
6
RSET
V
+3.3V Supply Voltage
CC
Output Slew-Rate Control, LVTTL. Set HIGH for SMPTE 259M/344M rise/fall specifications. Set LOW
for SMPTE 292M rise/fall specifications.
SD/HD
7
8
OUT-
Negative Data Output
Positive Data Output
OUT+
While DC-coupled, the MAX3812 operates properly as
Detailed Description
long as the specified common-mode voltage and differ-
The MAX3812 is a multirate SMPTE cable driver
designed to drive 75Ω coaxial 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 (Figure 2).
ential voltage swings are met. Because of the on-chip
biasing network (Figure 3), 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.
Differential Data Inputs
The 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.
V
CC
V
CC
V
CC
IN+
IN-
RSET
MAX3812
BANDGAP REFERENCE
ESD
STRUCTURES
ESD
STRUCTURES
AND BIASING CIRCUIT
IN+
IN-
OUT+
OUT-
V
CC
5kΩ
10kΩ
10kΩ
SD/HD
10kΩ
Figure 2. Functional Diagram
MAX3812
Figure 3. Differential Input Circuit
_______________________________________________________________________________________
5
Multirate SMPTE SD/HD Cable Driver
with Selectable Slew Rate
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.
MAX3812
V
CC
V
CC
V
CC
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.
40kΩ
5kΩ
SD/HD
Output Voltage Swing Control
The external R
resistor connected between V
and
SET
CC
ESD
STRUCTURES
the RSET pin controls the output voltage swing (Figure 5).
Typically the output voltage swing is set to 800mV
P-P
using a value of 750Ω. For output voltage swings other
than 800mV , see the graph Output Voltage Swing vs.
P-P
Figure 4. Slew-Rate Selection Switch
R
given in the Typical Operating Characteristics.
SET
Using R
values below 500Ω is not recommended.
SET
Slew-Rate Selection Switch
The 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/HD input (Figure 4). The SD/HD pin must be set
high for SMPTE 259M/344M standards and low for
SMPTE 292M standards.
The R
resistor should be placed as close as possible
SET
to the RSET pin and the capacitance at this node should
be minimized.
Applications Information
Layout Considerations
Use controlled-impedance transmission lines to interface
with the MAX3812 high-speed inputs and outputs.
Power-supply decoupling capacitors should be placed
Differential Data Outputs
The MAX3812 differential data outputs are current-mode
logic, CML (Figure 5). Each side of the differential output
as close as possible to the V
connections. To support
CC
will drive 800mV
into a doubly terminated 75Ω trans-
= 750Ω).
P-P
a 75Ω transmission-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.
mission line (R
SET
The cable driver output must have a source impedance
of 75Ω and 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 Circuit is recommended.
6
_______________________________________________________________________________________
Multirate SMPTE SD/HD Cable Driver
with Selectable Slew Rate
V
CC
V
CC
MAX3812
OUT+
OUT-
ESD
STRUCTURES
ESD
STRUCTURES
V
CC
V
CC
R
SET
V
CC
RSET
BANDGAP
REFERENCE
ESD
STRUCTURES
Figure 5. Differential Output and Biasing Circuit
Chip Information
TRANSISTOR COUNT: 926
PROCESS: SiGe Bipolar
_______________________________________________________________________________________
7
Multirate SMPTE SD/HD Cable Driver
with Selectable Slew Rate
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
INCHES
MILLIMETERS
DIM
A
MIN
MAX
0.069
0.010
0.019
0.010
MIN
1.35
0.10
0.35
0.19
MAX
1.75
0.25
0.49
0.25
0.053
0.004
0.014
0.007
N
A1
B
C
e
0.050 BSC
1.27 BSC
E
0.150
0.228
0.016
0.157
0.244
0.050
3.80
5.80
0.40
4.00
6.20
1.27
E
H
H
L
VARIATIONS:
INCHES
1
MILLIMETERS
DIM
D
MIN
MAX
0.197
0.344
0.394
MIN
4.80
8.55
9.80
MAX
5.00
N
8
MS012
AA
TOP VIEW
0.189
0.337
0.386
D
8.75 14
10.00 16
AB
D
AC
D
C
A
B
0∞-8∞
e
A1
L
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, .150" SOIC
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0041
B
1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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