MAX9247ECM+ Maxim Integrated Products, MAX9247ECM+ Datasheet - Page 15

• Manufacturer Part Number: MAX9247ECM+
• Description: IC SERIALIZER LVDS 48-LQFP
• Manufacturer: Maxim Integrated Products

Specifications of MAX9247ECM+

• Function: Serializer
• Data Rate: 840Mbps
• Input Type: Serial
• Output Type: LVDS
• Number Of Inputs: 18
• Number Of Outputs: 1
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2) Wait for at least t
3) Power up the MAX9248
The MAX9247 has isolated on-chip power domains. The
digital core supply (V
(V
The PLL has separate power and ground (V
PLLGND) and the LVDS input also has separate power
and ground (V
isolated by diode connections. Bypass each V
V
mount ceramic 0.1µF and 0.001µF capacitors in parallel
as close to the device as possible, with the smallest value
capacitor closest to the supply pin.
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.
Figure 16. IEC 61000-4-2 Contact Discharge ESD Test Circuit
Figure 17. Human Body ESD Test Circuit
CCPLL
CCIN
to get activity on the link
VOLTAGE
SOURCE
VOLTAGE
SOURCE
HIGH-
) are isolated but have a common ground (GND).
HIGH-
, and V
DC
Power-Supply Circuits and Bypassing
DC
CHARGE-CURRENT-
CHARGE-CURRENT-
LIMIT RESISTOR
CCLVDS
LIMIT RESISTOR
CCLVDS
______________________________________________________________________________________
150pF
1MΩ
100pF
CC
C
LOCK
C
S
and LVDSGND). The grounds are
S
pin with high-frequency, surface-
) and single-ended input supply
Cables and Connectors
RESISTANCE
of MAX9247 (or 17100 x t
DISCHARGE
STORAGE
CAPACITOR
RESISTANCE
DISCHARGE
STORAGE
CAPACITOR
330Ω
1.5kΩ
R
R
D
D
LVDS Output
DEVICE
CCPLL
UNDER
CC
DEVICE
TEST
UNDER
TEST
DC-Balanced LVDS Serializer
, V
CCIN
and
T
)
,
27-Bit, 2.5MHz-to-42MHz
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 PCB with separate lay-
ers for power, ground, and signals is recommended.
The MAX9247 ESD tolerance is rated for IEC 61000-4-
2, Human Body Model, Machine Model, and ISO 10605
standards. IEC 61000-4-2 and ISO 10605 specify ESD
tolerance for electronic systems. The IEC 61000-4-2
discharge components are C
330Ω (Figure 16). 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
17). For the Human Body Model, all pins are rated for
±3kV Contact Discharge. The ISO 10605 discharge
components are C
18). For ISO 10605, the LVDS outputs are rated for
±10kV contact and ±30kV air discharge. The Machine
Model discharge components are C
R
Figure 18. ISO 10605 Contact Discharge ESD Test Circuit
Figure 19. Machine Model ESD Test Circuit
D
= 0Ω (Figure 19).
VOLTAGE
SOURCE
VOLTAGE
SOURCE
HIGH-
HIGH-
DC
DC
CHARGE-CURRENT-
CHARGE-CURRENT-
LIMIT RESISTOR
LIMIT RESISTOR
S
330pF
S
200pF
= 100pF and R
C
= 330pF and R
C
S
S
RESISTANCE
DISCHARGE
STORAGE
CAPACITOR
RESISTANCE
DISCHARGE
STORAGE
CAPACITOR
2kΩ
R
0Ω
R
D
D
S
= 150pF and R
ESD Protection
D
Board Layout
D
= 1.5kΩ (Figure
S
= 2kΩ (Figure
= 200pF and
DEVICE
UNDER
DEVICE
UNDER
TEST
TEST
D
15
=