max9126euet Maxim Integrated Products, Inc., max9126euet Datasheet - Page 6

• Manufacturer Part Number: max9126euet
• Description: Quad Lvds Line Receivers With Integrated Termination
• Manufacturer: Maxim Integrated Products, Inc.

The LVDS interface standard is a signaling method
intended for point-to-point communication over a con-
trolled-impedance medium as defined by the ANSI
TIA/EIA-644 and IEEE 1596.3 standards. The LVDS
standard uses a lower voltage swing than other com-
mon communication standards, achieving higher data
rates with reduced power consumption while reducing
EMI emissions and system susceptibility to noise.
The MAX9125/MAX9126 are 500Mbps, four-channel
LVDS receivers intended for high-speed, point-to-point,
low-power applications. Each channel accepts an
LVDS input and translates it to an LVTTL/LVCMOS out-
put. The receiver is capable of detecting differential
signals as low as 100mV and as high as 1V within an
Quad LVDS Line Receivers with
Integrated Termination
Table 1. Input/Output Function Table
Figure 1. Inputs with Internal Fail-Safe Circuitry
6
_______________________________________________________________________________________
All other combinations of ENABLE inputs
EN
L
IN_+
IN_-
ENABLES
R
R
IN1
IN1
Detailed Description
R
IN2
V
CC
V
CC
MAX9125
- 0.3V
EN
H
V
V
MAX9125
MAX9126
ID
ID
≥ +100mV
≤ -100mV
OUT_
IN_+
IN_-
input voltage range of 0 to 2.4V. The 250mV to 400mV
differential output of an LVDS driver is nominally cen-
tered around a +1.2V offset. This offset, coupled with
the receiver’s 0 to 2.4V input voltage range, allows an
approximate ±1V shift in the signal (as seen by the
receiver). This allows for a difference in ground refer-
ences of the transmitter and the receiver, the common-
mode effects of coupled noise, or both. The LVDS
standards specify an input voltage range of 0 to 2.4V
referenced to receiver ground.
The MAX9126 has an integrated termination resistor
internally connected across each receiver input. The
internal termination saves board space, eases layout,
and reduces “stub length” compared to an external ter-
mination resistor. In other words, the transmission line
is terminated on the IC.
R
DIFF
R
R
IN1
IN1
(IN_+) - (IN_-)
R
IN2
INPUTS
V
CC
X
Open, undriven short, or
undriven 100Ω parallel
termination
Open or undriven short
V
MAX9126
CC
- 0.3V
OUT_
OUTPUT
OUT_
Z
H
H
L