MAX9209 Maxim, MAX9209 Datasheet - Page 13

• Manufacturer Part Number: MAX9209
• Description: The MAX9209/MAX9213 serialize 21 bits of LVTTL/LVCMOS parallel input data to three LVDS outputs
• Manufacturer: Maxim

Figure 14. Two Capacitors per Link, AC-Coupled, DC-Balanced Mode
Common-mode voltage differences may be due to
ground potential variation or common-mode noise. If
there is more than ±1V of difference, the receiver is not
guaranteed to read the input signal correctly and may
cause bit errors. AC-coupling filters low-frequency
ground shifts and common-mode noise and passes
high-frequency data. A common-mode voltage differ-
ence up to the voltage rating of the coupling capacitor
(minus half the differential swing) is tolerated. DC-bal-
anced coding of the data is required to maintain the dif-
ferential signal amplitude and limit jitter on an
AC-coupled link. A capacitor in series with each output
of the LVDS driver is sufficient for AC-coupling. However,
PWRDWN
TxCLK IN
TxIN
7
7
7
______________________________________________________________________________________
(7 + 2):1
(7 + 2):1
(7 + 2):1
PLL
21:3 SERIALIZER
MAX9209
MAX9213
R
R
R
R
SERIALIZER INSTEAD OF DESERIALIZER.
O
O
O
O
SURFACE-MOUNT CAPACITORS
HIGH-FREQUENCY CERAMIC
Programmable DC-Balanced
TxOUT
TxCLK OUT
CAN ALSO BE PLACED AT
two capacitors—one at the serializer output and one at
the deserializer input—provide protection in case either
end of the cable is shorted to a high voltage.
All signal and control inputs except DCB/NC are 5V tol-
erant and are internally pulled down to GND. The
DCB/NC pin has a pullup on the MAX9209/MAX9213.
The MAX9209/MAX9213 have programmable DC bal-
ance/non-DC balance. See Table 1 for DCB/NC default
settings and operating modes.
100Ω
100Ω
100Ω
100Ω
R
R
R
R
RxCLK IN
T
T
T
T
=
=
=
=
RxIN
21-Bit Serializers
DCB/NC Pin Default Conditions
3:21 DESERIALIZER
MAX9210
MAX9214
1:(9 - 2)
1:(9 - 2)
1:(9 - 2)
5V Tolerant Inputs
PLL
7
7
7
RxOUT
PWRDWN
RxCLK OUT
13