max9211eum Maxim Integrated Products, Inc., max9211eum Datasheet - Page 13

• Manufacturer Part Number: max9211eum
• Description: Programmable Dc-balanced 21-bit Serializers
• Manufacturer: Maxim Integrated Products, Inc.

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
MAX9211
MAX9213
MAX9215
R
R
R
R
SERIALIZER INSTEAD OF DESERIALIZER.
O
O
O
O
SURFACE-MOUNT CAPACITORS
HIGH-FREQUENCY CERAMIC
TxOUT
TxCLK OUT
Programmable DC-Balanced
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 pulldown on MAX9211/MAX9215
and a pullup on the MAX9209/MAX9213.
The MAX9209/MAX9211/MAX9213/MAX9215 have pro-
grammable DC balance/non-DC balance. See Table 1
for DCB/NC default settings and operating modes.
100
100
100
100
R
R
R
R
RxCLK IN
T
T
T
T
=
=
=
=
RxIN
21-Bit Serializers
DCB/NC Pin Default Conditions
3:21 DESERIALIZER
MAX9210
MAX9212
MAX9214
MAX9216
1:(9 - 2)
1:(9 - 2)
1:(9 - 2)
5V Tolerant Inputs
PLL
7
7
7
RxOUT
PWRDWN
RxCLK OUT
13