max9247etmt Maxim Integrated Products, Inc., max9247etmt Datasheet - Page 15

• Manufacturer Part Number: max9247etmt
• Description: Max9247 27-bit, 2.5mhz-to-42mhz Dc-balanced Lvds Serializer
• Manufacturer: Maxim Integrated Products, Inc.

The LVDS output is a current source. The voltage swing
is proportional to the termination resistance. The output
is rated for a differential load of 100Ω ±1%.
Interconnect for LVDS typically has a differential imped-
ance of 100Ω. Use cables and connectors that have
matched differential impedance to minimize impedance
discontinuities.
Twisted-pair and shielded twisted-pair cables offer
superior signal quality compared to ribbon cable and
tend to generate less EMI due to magnetic field cancel-
ing effects. Balanced cables pick up noise as common
mode, which is rejected by the LVDS receiver.
Separate the LVTTL/LVCMOS inputs and LVDS output to
prevent crosstalk. A four-layer PC board with separate
layers for power, ground, and signals is recommended.
The MAX9247 ESD tolerance is rated for IEC 61000-4-
2, Human Body Model and ISO 10605 standards. IEC
61000-4-2 and ISO 10605 specify ESD tolerance for
electronic systems. The IEC 61000-4-2 discharge com-
ponents are C
Figure 16. IEC 61000-4-2 Contact Discharge ESD Test Circuit
VOLTAGE
SOURCE
HIGH-
DC
CHARGE-CURRENT-
LIMIT RESISTOR
S
= 150pF and R
______________________________________________________________________________________
150pF
C
S
Cables and Connectors
RESISTANCE
DISCHARGE
STORAGE
CAPACITOR
330Ω
R
D
D
= 330Ω (Figure 16).
ESD Protection
Board Layout
LVDS Output
DEVICE
UNDER
TEST
DC-Balanced LVDS Serializer
27-Bit, 2.5MHz-to-42MHz
For IEC 61000-4-2, the LVDS outputs are rated for ±8kV
Contact Discharge and ±15kV Air-Gap Discharge. The
Human Body Model discharge components are C
100pF and R
Body Model, all pins are rated for ±3kV Contact
Discharge. The ISO 10605 discharge components are
C
the LVDS outputs are rated for ±10kV contact and
±30kV air discharge.
Figure 17. Human Body ESD Test Circuit
Figure 18. ISO 10605 Contact Discharge ESD Test Circuit
PROCESS: CMOS
S
= 330pF and R
VOLTAGE
SOURCE
VOLTAGE
SOURCE
HIGH-
HIGH-
DC
DC
CHARGE-CURRENT-
CHARGE-CURRENT-
D
LIMIT RESISTOR
LIMIT RESISTOR
= 1.5kΩ (Figure 17). For the Human
D
1MΩ
330pF
100pF
= 2kΩ (Figure 18). For ISO 10605,
C
C
S
S
RESISTANCE
DISCHARGE
RESISTANCE
DISCHARGE
STORAGE
CAPACITOR
Chip Information
STORAGE
CAPACITOR
1.5kΩ
2kΩ
R
R
D
D
DEVICE
UNDER
DEVICE
UNDER
TEST
TEST
S
15
=