EVALUATION KIT AVAILABLE
MAX9248/MAX9250
27-Bit, 5MHz to 42MHz
DC-Balanced LVDS Deserializers
General Description
The MAX9248/MAX9250 digital video serial-to-parallel
converters deserialize a total of 27 bits during data and
control phases. In the data phase, the LVDS serial input
is converted to 18 bits of parallel video data and in the
control phase, the input is converted to 9 bits of parallel
control data. The separate video and control phases take
advantage of video timing to reduce the serial-data rate.
The MAX9248/MAX9250 pair with the MAX9247 serializer
to form a complete digital video transmission system. For
operating frequencies less than 35MHz, the MAX9248/
MAX9250 can also pair with the MAX9217 serializer.
The MAX9248 features spread-spectrum capability, allow-
ing output data and clock to spread over a specified fre-
quency range to reduce EMI. The data and clock outputs
are programmable for a spectrum spread of ±4% or ±2%.
The MAX9250 features output enable input control to
allow data busing.
Proprietary data decoding reduces EMI and provides DC
balance. The DC balance allows AC-coupling, providing
isolation between the transmitting and receiving ends of
the interface. The MAX9248/MAX9250 feature a select-
able rising or falling output latch edge.
ESD tolerance is specified for ISO 10605 with ±10kV
Contact Discharge and ±30kV Air-Gap Discharge.
The MAX9248/MAX9250 operate from a +3.3V ±10%
core supply and feature a separate output supply for
interfacing to 1.8V to 3.3V logic-level inputs. These
devices are available in a 48-lead LQFP package and are
specified from -40°C to +85°C or -40°C to +105°C.
Benefits and Features
●
Programmable ±4% or ±2% Spread-Spectrum
Output for Reduced EMI (MAX9248)
●
Proprietary Data Decoding for DC Balance and
Reduced EMI
●
Control Data Deserialized During Video Blanking
●
Five Control Data Inputs are Single-Bit-Error Tolerant
●
Output Transition Time is Scaled to Operating
Frequency for Reduced EMI
●
Staggered Output Switching Reduces EMI
●
Output Enable Allows Busing of Outputs (MAX9250)
●
Clock Pulse Stretch on Lock
●
Wide ±2% Reference Clock Tolerance
●
Synchronizes to MAX9247 Serializer Without
External Control
●
ISO 10605 and IEC 61000-4-2 Level 4 ESD
Protection
●
Separate Output Supply Allows Interface to 1.8V
to 3.3V Logic
●
+3.3V Core Power Supply
●
Space-Saving LQFP Package
●
-40°C to +85°C and -40°C to +105°C Operating
Temperature Ranges
Applications
●
●
●
●
Navigation System Displays
In-Vehicle Entertainment Systems
Video Cameras
LCD Displays
Ordering Information
appears at end of data sheet.
19-3943; Rev 5; 6/17
MAX9248/MAX9250
27-Bit, 5MHz to 42MHz
DC-Balanced LVDS Deserializers
Absolute Maximum Ratings
V
CC_
to _GND......................................................-0.5V to +4.0V
Any Ground to Any Ground ..................................-0.5V to +0.5V
IN+, IN- to LVDSGND...........................................-0.5V to +4.0V
IN+, IN- Short Circuit to LVDSGND or V
CCLVDS
......Continuous
(R/F, OUTEN, RNG_, REFCLK, SS
PWRDWN)
to GND .............................. -0.5V to (V
CC
+ 0.5V)
(RGB_OUT[17:0], CNTL_OUT[8:0], DE_OUT, PCLK_OUT,
LOCK)
to V
CCOGND
...........................-0.5V to (V
CCO
+ 0.5V)
Continuous Power Dissipation (T
A
= +70°C)
48-Lead LQFP (derate 21.7mW/°C above +70°C) ....1739mW
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 ............................................................±2kV
ISO 10605 (R
D
= 2kΩ, C
S
= 330pF)
Contact Discharge (IN+, IN-) to GND ............................±10kV
Air-Gap Discharge (IN+, IN-) to GND ............................±30kV
IEC 61000-4-2 (R
D
= 330Ω, C
S
= 150pF)
Contact Discharge (IN+, IN-) to GND ............................±10kV
Air-Gap Discharge (IN+, IN-) to GND ............................±15kV
Storage Temperature Range ............................ -65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) ................................. +300°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,
PWRDWN
= high, differential input voltage │V
ID
│ = 0.05V to 1.2V, input common-mode voltage
V
CM
= │V
ID
/2│ to V
CC
- │V
ID
/2│, T
A
= -40°C to +105°C, unless otherwise noted. Typical values are at V
CC_
= +3.3V, │V
ID
│ = 0.2V,
V
CM
= 1.2V, T
A
= +25°C.) (Notes 1, 2)
PARAMETER
High-Level Input Voltage
Low-Level Input Voltage
SYMBOL
V
IH
V
IL
V
IN
= -0.3V to 0
(MAX9248/MAX9250ECM),
V
IN
= -0.15V to 0
(MAX9248/MAX9250GCM),
V
IN
= 0 to (V
CC
+ 0.3V)
Input Clamp Voltage
SINGLE-ENDED OUTPUTS (RGB_OUT[17:0], CNTL_OUT[8:0], DE_OUT, PCLK_OUT,
LOCK)
I
OH
= -100µA
High-Level Output Voltage
V
OH
I
OH
= -2mA, RNG1 = high
I
OH
= -2mA, RNG1 = low
I
OL
= 100µA
Low-Level Output Voltage
High-Impedance Output
Current
Output Short-Circuit Current
V
OL
I
OL
= 2mA, RNG1 = high
I
OL
= 2mA, RNG1 = low
I
OZ
I
OS
PWRDWN
= low or OUTEN = low,
V
O
= -0.3V to (V
CCO
+ 0.3V)
RNG1 = high, V
O
= 0
RNG1 = low, V
O
= 0
-10
-10
-7
V
CCO
- 0.1
V
CCO
- 0.35
V
CCO
- 0.4
0.1
0.3
0.35
+10
-50
-40
µA
mA
V
V
V
CL
I
CL
= -18mA
CONDITIONS
MIN
2.0
-0.3
TYP
MAX
V
CC
+ 0.3
+0.8
UNITS
V
V
SINGLE-ENDED INPUTS (R/F,
OUTEN, RNG0, RNG1, REFCLK,
PWRDWN,
SS)
Input Current
I
IN
PWRDWN
=
high or low
-100
+20
µA
-20
+20
-1.5
V
www.maximintegrated.com
Maxim Integrated
│
2
MAX9248/MAX9250
27-Bit, 5MHz to 42MHz
DC-Balanced LVDS Deserializers
Electrical Characteristics (continued)
(V
CC_
= +3.0V to +3.6V,
PWRDWN
= high, differential input voltage │V
ID
│ = 0.05V to 1.2V, input common-mode voltage
V
CM
= │V
ID
/2│ to V
CC
- │V
ID
/2│, T
A
= -40°C to +105°C, unless otherwise noted. Typical values are at V
CC_
= +3.3V, │V
ID
│ = 0.2V,
V
CM
= 1.2V, T
A
= +25°C.) (Notes 1, 2)
PARAMETER
LVDS INPUT (IN+, IN-)
Differential Input High
Threshold
Differential Input Low Threshold
Input Current
V
TH
V
TL
I
IN+
, I
IN-
(Note 3)
(Note 3)
PWRDWN
= high or low (Note 3)
PWRDWN
=
high or low
Input Bias Resistor (Note 3)
R
IB
V
CC
_ =
0 or open,
PWRDWN
= 0 or open,
Figure 1
MAX9248/MAX9250ECM
MAX9248/MAX9250GCM
MAX9248/MAX9250ECM
-50
-40
42
42
42
60
60
60
+40
78
88
78
kΩ
50
mV
mV
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX9248/MAX9250GCM
42
-60
60
88
+60
µA
Power-Off Input Current
POWER SUPPLY
I
INO+
, I
INO-
V
CC
_ = 0 or open,
PWRDWN
= 0 or open (Note 3)
5MHz
10MHz
10MHz
20MHz
20MHz
42MHz
5MHz
10MHz
10MHz
20MHz
20MHz
35MHz
42MHz
MAX9250
C
L
= 8pF,
worst-case
pattern,
Figure 2
Worst-Case Supply Current
MAX9248
C
L
= 8pF,
worst-case
pattern,
Figure 2
RNG1 = low
RNG0 = high
RNG1 = high
RNG0 = low
RNG1 = high
RNG0 = high
RNG1 = low
RNG0 = high
RNG1 = high
RNG0 = low
RNG1 = high
RNG0 = high
28
49
33
59
45
89
40
70
49
87
68
100
120
50
µA
Power-Down Supply Current
I
CCZ
(Note 4)
www.maximintegrated.com
Maxim Integrated
│
3
MAX9248/MAX9250
27-Bit, 5MHz to 42MHz
DC-Balanced LVDS Deserializers
AC Electrical Characteristics
(V
CC_
= +3.0V to +3.6V, C
L
= 8pF,
PWRDWN
= high, differential input voltage │V
ID
│ = 0.1V to 1.2V, input common-mode voltage
V
CM
= │V
ID
/2│ to V
CC
- │V
ID
/2│, T
A
= -40°C to +105°C, unless otherwise noted. Typical values are at V
CC_
= +3.3V, │V
ID
│ = 0.2V,
V
CM
= 1.2V, T
A
= +25°C.) (Notes 3, 5)
PARAMETER
SYMBOL
CONDITIONS
MAX9248/MAX9250ECM
MAX9248/MAX9250GCM
MAX9248/MAX9250ECM
MAX9248/MAX9250GCM
REFCLK to serializer PCLK_IN,
worst-case output pattern (Figure
2)
20% to 80%
MAX9248/
MAX9250ECM
MAX9248/
MAX9250GCM
MAX9248/
MAX9250ECM
MAX9248/
MAX9250GCM
MAX9248/
MAX9250ECM
MAX9248/
MAX9250ECM
MAX9248/
MAX9250GCM
MIN
23.8
28.6
5
5
-2.0
40
50
TYP
MAX
200
200
42.0
35.0
+2.0
60
6
UNITS
REFCLK TIMING REQUIREMENTS
Period
Frequency
Frequency Variation
Duty Cycle
Transition Time
SWITCHING CHARACTERISTICS
2.2
2.2
2.8
2.8
1.9
2.3
2.3
0.4 x
t
T
0.4 x
t
T
0.35
x t
T
0.35
x t
T
0.45 x
t
T
0.45 x
t
T
0.4 x
t
T
0.4 x
t
T
33,600 x t
T
16,928 x t
T
4.6
4.9
ns
5.2
6.1
4.0
4.3
5.2
0.6 x
t
T
0.6 x
t
T
ns
ns
ns
ns
ns
ns
t
t
f
CLK
Δf
CLK
DC
t
TRAN
ns
MHz
%
%
ns
RNG1 = high
Output Rise Time
t
R
Figure 3
RNG1 = low
RNG1 = high
Output Fall Time
t
R
Figure 3
RNG1 = low
PCLK_OUT High Time
PCLK_OUT Low Time
Data Valid Before PCLK_OUT
Data Valid After PCLK_OUT
PLL Lock to REFCLK
t
HIGH
t
LOW
t
DVB
t
DVA
t
PLLREF
Figure 4
Figure 4
Figure 5
Figure 5
MAX9248,
Figure 8
MAX9250,
Figure 7
www.maximintegrated.com
Maxim Integrated
│
4
MAX9248/MAX9250
27-Bit, 5MHz to 42MHz
DC-Balanced LVDS Deserializers
AC Electrical Characteristics (continued)
(V
CC_
= +3.0V to +3.6V, C
L
= 8pF,
PWRDWN
= high, differential input voltage │V
ID
│ = 0.1V to 1.2V, input common-mode voltage
V
CM
= │V
ID
/2│ to V
CC
- │V
ID
/2│, T
A
= -40°C to +105°C, unless otherwise noted. Typical values are at V
CC_
= +3.3V, │V
ID
│ = 0.2V,
V
CM
= 1.2V, T
A
= +25°C.) (Notes 3, 5)
PARAMETER
SYMBOL
SS = high,
Figure 11
Spread-Spectrum Output
Frequency (MAX9248)
f
PCLK_OUT
SS = low,
Figure 11
Spread-Spectrum Modulation
Frequency
Power-Down Delay
SS Change Delay
Output Enable Time
Output Disable Time
CONDITIONS
Maximum output
frequency
Minimum output
frequency
Maximum output
frequency
Minimum output
frequency
MIN
TYP
MAX
UNITS
f
REFCLK
f
REFCLK
f
REFCLK
+ 3.6% + 4.0% + 4.4%
f
REFCLK
f
REFCLK
f
REFCLK
- 4.4%
- 4.0%
- 3.6%
f
REFCLK
f
REFCLK
f
REFCLK
+ 1.8% + 2.0% + 2.2%
f
REFCLK
f
REFCLK
f
REFCLK
- 2.2%
- 2.0%
- 1.8%
f
REFCLK
+ 3.6%
MHz
f
SSM
t
PDD
t
ΔSSPLL
t
OE
t
OZ
Figure 11
Figures 7, 8
MAX9248,
Figure 17
MAX9250,
Figure 8
MAX9250,
Figure 9
kHz
100
ns
ns
ns
ns
32,800 x t
T
10
10
30
30
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
TH
and V
TL
.
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
CC
- 0.3V.
PWRDWN
is ≤ 0.3V, REFCLK is static.
Note 5:
C
L
includes probe and test jig capacitance.
www.maximintegrated.com
Maxim Integrated
│
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
