19-3955; Rev 4; 4/12
KIT
ATION
EVALU
BLE
AVAILA
27-Bit, 2.5MHz-to-42MHz
DC-Balanced LVDS Serializer
General Description
Features
o
Preemphasis Improves Eye Diagram and Signal
Integrity at the Output
o
Proprietary Data Encoding for DC Balance and
Reduced EMI
o
Control Data Sent During Video Blanking
o
Five Control Data Inputs are Single-Bit-Error
Tolerant
o
Programmable Phase-Shifted LVDS Signaling
Reduces EMI
o
Output Common-Mode Filter Reduces EMI
o
Greater Than 10m STP Cable Drive
o
Wide ±2% Reference Clock Tolerance
o
ISO 10605 and IEC 61000-4-2 Level 4
ESD Protection
o
Separate Input Supply Allows Interface to 1.8V
to 3.3V Logic
o
+3.3V Core Supply
o
Space-Saving LQFP Package
o
-40°C to +85°C and -40°C to +105°C Operating
Temperature Ranges
MAX9247
The MAX9247 digital video parallel-to-serial converter
serializes 27 bits of parallel data into a serial-data stream.
Eighteen bits of video data and 9 bits of control data are
encoded and multiplexed onto the serial interface, reduc-
ing the serial-data rate. The data-enable input determines
when the video or control data is serialized.
The MAX9247 pairs with the MAX9248/MAX9250 dese-
rializers to form a complete digital video serial link.
Interconnect can be controlled-impedance PCB traces or
twisted-pair cable. Proprietary data encoding reduces
EMI and provides DC balance. DC balance allows AC-
coupling, providing isolation between the transmitting
and receiving ends of the interface. The LVDS output is
internally terminated with 100Ω. For operating frequen-
cies less than 35MHz, the MAX9247 can also pair with
the MAX9218 deserializer.
ESD tolerance is specified for ISO 10605 with ±10kV
Contact Discharge and ±30kV Air-Gap Discharge.
The MAX9247 operates from a +3.3V core supply and
features a separate input supply for interfacing to 1.8V
to 3.3V logic levels. This device is available in a 48-lead
LQFP package and is specified from -40°C to +85°C or
-40°C to +105°C.
Ordering Information
PART
MAX9247ECM+
MAX9247ECM/V+
MAX9247GCM+
MAX9247GCM/V+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +105°C
-40°C to +105°C
PIN-PACKAGE
48 LQFP
48 LQFP
48 LQFP
48 LQFP
Applications
Navigation System Displays
In-Vehicle Entertainment Systems
Video Cameras
LCDs
+Denotes
a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
Pin Configuration
RGB_IN9
RGB_IN8
RGB_IN7
RGB_IN6
RGB_IN5
RGB_IN4
RGB_IN3
RGB_IN2
RGB_IN1
RGB_IN0
V
CC
40
39
38
TOP VIEW
48
47
46
45
44
43
42
41
GND
V
CCIN
RGB_IN10
RGB_IN11
RGB_IN12
RGB_IN13
RGB_IN14
RGB_IN15
RGB_IN16
RGB_IN17
CNTL_IN0
CNTL_IN1
1
2
3
4
5
6
7
8
9
10
11
12
+
37
GND
36
35
34
33
32
31
MAX9247
30
29
28
27
26
25
RNG0
RNG1
V
CCLVDS
OUT+
OUT-
LVDSGND
LVDSGND
CMF
PWRDWN
V
CCPLL
PLLGND
PRE
13
14
15
16
17
18
19
20
21
22
23
V
CC
CNTL_IN2
GND
CNTL_IN3
CNTL_IN4
CNTL_IN5
CNTL_IN6
CNTL_IN7
CNTL_IN8
DE_IN
LQFP
________________________________________________________________
Maxim Integrated Products
PCLK_IN
I.C.
24
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
27-Bit, 2.5MHz-to-42MHz
DC-Balanced LVDS Serializer
MAX9247
ABSOLUTE MAXIMUM RATINGS
V
CC_
to _GND........................................................-0.5V to +4.0V
Any Ground to Any Ground...................................-0.5V to +0.5V
OUT+, OUT-, CMF to LVDSGND...........................-0.5V to +4.0V
OUT+, OUT- Short Circuit to LVDSGND
or V
CCLVDS
.............................................................Continuous
OUT+, OUT- Short Through 0.125µF (or smaller),
25V Series Capacitor..........................................-0.5V to +16V
RGB_IN[17:0], CNTL_IN[8:0], DE_IN,
RNG0, RNG1, PRE, PCLK_IN,
PWRDWN
to GND ...............................-0.5V to (V
CCIN
+ 0.5V)
Continuous Power Dissipation (T
A
= +70°C)
48-Lead LQFP (derate 20.8mW/°C above +70°C)....1666.7mW
ESD Protection
Machine Model (R
D
= 0Ω, C
S
= 200pF)
All Pins to GND ..............................................................±200V
Human Body Model (R
D
= 1.5kΩ, C
S
= 100pF)
All Pins to GND ................................................................±3kV
ISO 10605 (R
D
= 2kΩ, C
S
= 330pF)
Contact Discharge (OUT+, OUT-) to LVDSGND ...........±10kV
Air-Gap Discharge (OUT+, OUT-) to LVDSGND ...........±30kV
IEC 61000-4-2 (R
D
= 330Ω, C
S
= 150pF)
Contact Discharge (OUT+, OUT-) to LVDSGND ...........±10kV
Air-Gap Discharge (OUT+, OUT-) to LVDSGND ...........±15kV
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s)..................................+300°C
Soldering Temperature (reflow) .......................................+260°C
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
CC_
= +3.0V to +3.6V, R
L
= 100Ω ±1%,
PWRDWN
= high, PRE = low, T
A
= -40°C to +105°C, unless otherwise noted. Typical
values are at V
CC_
= +3.3V, T
A
= +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
V
CCIN
= 1.71V to < 3V (Note 3)
V
CCIN
= 3.0V to 3.6V
V
CCIN
= 1.71V to < 3V (Note 3)
V
CCIN
= 3.0V to 3.6V
V
CCIN
= 1.71V
to 3.6V,
PWRDWN
=
high or low
I
CL
= -18mA
Figure 1
Figure 1
Figure 1
Figure 1
V
OUT+
or V
OUT-
= 0V or 3.6V
V
OD
= 0V
V
OUT+
= 0V,
V
OUT-
= 3.6V
V
OUT+
= 3.6V,
V
OUT-
= 0V
-15
±8
5.5
1.125
1.29
250
335
V
IN
= -0.3V to 0V
(MAX9247ECM),
V
IN
= -0.15V to 0V
(MAX9247GCM)
V
IN
= 0V to (V
CCIN
+ 0.3V)
MIN
0.65 x V
CCIN
2
-0.3
-0.3
TYP
MAX
V
CCIN
+ 0.3
0.3 + V
CCIN
0.3 x V
CCIN
+0.8
UNITS
SINGLE-ENDED INPUTS (RGB_IN[17:0], CNTL_IN[8:0], DE_IN, PCLK_IN,
PWRDWN,
RNG_, PRE)
High-Level Input Voltage
Low-Level Input Voltage
V
IH
V
IL
V
V
Input Current
I
IN
-100
+20
µA
-20
+20
-1.5
450
20
1.475
20
+15
15
V
mV
mV
V
mV
mA
mA
Input Clamp Voltage
LVDS OUTPUTS (OUT+, OUT-)
Differential Output Voltage
Change in V
OD
Between
Complementary Output States
Common-Mode Voltage
Change in V
OS
Between
Complementary Output States
Output Short-Circuit Current
Magnitude of Differential
Output Short-Circuit Current
Output High-Impedance
Current
V
CL
V
OD
∆V
OD
V
OS
∆V
OS
I
OS
I
OSD
I
OZ
PWRDWN
= low
or V
CC_
= 0V
-1
+1
µA
2
_______________________________________________________________________________________
27-Bit, 2.5MHz-to-42MHz
DC-Balanced LVDS Serializer
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC_
= +3.0V to +3.6V, R
L
= 100Ω ±1%,
PWRDWN
= high, PRE = low, T
A
= -40°C to +105°C, unless otherwise noted. Typical
values are at V
CC_
= +3.3V, T
A
= +25°C.) (Notes 1, 2)
PARAMETER
Differential Output Resistance
SYMBOL
R
O
2.5MHz
5MHz
R
L
= 100Ω
±1%,
C
L
= 5pF,
continuous 10
transition words
10MHz
20MHz
35MHz
42MHz
Power-Down Supply Current
I
CCZ
(Note 4)
PRE = 0
PRE = 1
PRE = 0
PRE = 1
PRE = 0
PRE = 1
PRE = 0
PRE = 1
PRE = 0
PRE = 1
PRE = 0
PRE = 1
60
50
33
23
18
CONDITIONS
MIN
78
TYP
110
15
MAX
147
25
27
25
27
28
30
39
42
65
69
70
75
50
µA
mA
UNITS
Ω
MAX9247
Worst-Case Supply Current
I
CCW
AC ELECTRICAL CHARACTERISTICS
(V
CC_
= +3.0V to +3.6V, R
L
= 100Ω ±1%, C
L
= 5pF,
PWRDWN
= high, PRE = low, T
A
= -40°C to +105°C, unless otherwise noted.
Typical values are at V
CC_
= +3.3V, T
A
= +25°C.) (Note 3)
PARAMETER
PCLK_IN TIMING REQUIREMENTS
Clock Period
Clock Frequency
Clock Frequency Difference from
Deserializer Reference Clock
Clock Duty Cycle
Clock Transition Time
SWITCHING CHARACTERISTICS
Output Rise Time
Output Fall Time
Input Setup Time
Input Hold Time
t
RISE
t
FALL
t
SET
t
HOLD
20% to 80%,
V
OD
≥
250mV, Figure 3
80% to 20%,
V
OD
≥
250mV, Figure 3
Figure 4
Figure 4
PRE = low
PRE = high
PRE = low
PRE = high
3
3
280
240
280
240
370
320
370
320
ps
ps
ns
ns
t
T
f
CLK
∆f
CLK
DC
t
R
, t
F
t
HIGH
/t
T
or t
LOW
/t
T
, Figure 2
Figure 2
Figure 2
MAX9247ECM
MAX9247GCM
MAX9247ECM
MAX9247GCM
23.8
28.6
2.5
2.5
-2
35
50
400.0
400.0
42.0
35.0
+2
65
2.5
ns
MHz
%
%
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
_______________________________________________________________________________________
3
27-Bit, 2.5MHz-to-42MHz
DC-Balanced LVDS Serializer
MAX9247
AC ELECTRICAL CHARACTERISTICS (continued)
(V
CC_
= +3.0V to +3.6V, R
L
= 100Ω±1%, C
L
= 5pF,
PWRDWN
= high, PRE = low, T
A
= -40°C to +105°C, unless otherwise noted.
Typical values are at V
CC_
= +3.3V, T
A
= +25°C.) (Note 3)
PARAMETER
Serializer Delay
PLL Lock Time
Power-Down Delay
Peak-to-Peak Output Jitter
SYMBOL
t
SD
t
LOCK
t
PD
t
JITT
Figure 5
Figure 6
Figure 7
Measured with PRBS input pattern at
840Mbps data rate
840Mbps data rate,
CMF open, Figure 8
840Mbps data rate,
CMF 0.1µF to ground, Figure 8
22
12
CONDITIONS
MIN
3.10 x
t
T
+ 2.0
TYP
MAX
3.10 x
t
T
+ 8.0
17,100 x
t
T
1
150
70
mV
50
UNITS
ns
ns
µs
ps
Peak-to-Peak Output Offset
Voltage
V
OS(P-P)
Note 1:
Current into a pin is defined as positive. Current out of a pin is defined as negative. All voltages are referenced to ground,
except V
OD
,
∆V
OD
, and
∆V
OS
.
Note 2:
Maximum and minimum limits over temperature are guaranteed by design and characterization. Devices are production
tested at T
A
= +25°C.
Note 3:
Parameters are guaranteed by design and characterization and are not production tested. Limits are set at ±6 sigma.
Note 4:
All LVTTL/LVCMOS inputs, except
PWRDWN
at
≤
0.3V or
≥
V
CCIN
- 0.3V.
PWRDWN
is
≤
0.3V.
4
_______________________________________________________________________________________
27-Bit, 2.5MHz-to-42MHz
DC-Balanced LVDS Serializer
Typical Operating Characteristics
(V
CC_
= +3.3V, R
L
= 100Ω, T
A
= +25°C, unless otherwise noted.)
WORST-CASE PATTERN
SUPPLY CURRENT vs. FREQUENCY
MAX9247 toc01
MAX9247
EYE DIAGRAM WITHOUT PREEMPHASIS
MAX9247 toc02
EYE DIAGRAM WITH PREEMPHASIS
PRE = HIGH
f
REFCLK
= 42MHz
2 METER CAT5 CABLE
100Ω TERMINATION
GND
MAX9247 toc03
70
60
SUPPLY CURRENT (mA)
50
40
WITH PREEMPHASIS
PRE = LOW
f
REFCLK
= 42MHz
2 METER CAT5 CABLE
100Ω TERMINATION
100mV/div
30
20
10
0
0
10
20
30
40
FREQUENCY (MHz)
WITHOUT PREEMPHASIS
GND
100mV/div
200ps/div
200ps/div
BIT-ERROR RATE vs. CABLE LENGTH
MAX9247 toc04
CABLE LENGTH
vs. FREQUENCY BIT-ERROR RATE < 10
-9
40
35
FREQUENCY (MHz)
30
25
20
15
10
5
MAX9247 toc05
1.00E-14
CAT5 CABLE
45
1.00E-13
BIT-ERROR RATE
1.00E-12
1.00E-11
f
REFCLK
= 42MHz
840Mbps DATA RATE
FOR CABLE LENGTH < 10m
BER < 10
-12
0
2
4
6
8
10
12
1.00E-10
CAT5 CABLE LENGTH (m)
0
2
4
6
8
10 12 14 16 18 20
CABLE LENGTH (m)
_______________________________________________________________________________________
5
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