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參數(shù)資料
| 型號(hào)： | MAX9178ETE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | Quad LVDS Line Driver with High-ESD Tolerance and Flow-Through Pinout |
| 中文描述： | QUAD LINE DRIVER, QCC16 |
| 封裝： | 4 X 4 MM, 0.80 MM HEIGHT, MO-220, TQFN-16 |
| 文件頁(yè)數(shù)： | 9/14頁(yè) |
| 文件大小： | 319K |
| 代理商： | MAX9178ETE |
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Detailed Description
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 common
communication standards, achieving higher data rates
with reduced power consumption, while reducing EMI
emissions and system susceptibility to noise.
The MAX9178 is a 400Mbps quad differential LVDS dri-
ver that is designed for high-speed, point-to-point, and
low-power applications. This device accepts LVTTL/
LVCMOS input levels and translates them to LVDS out-
put signals.
The MAX9178 generates a 2.5mA to 4.5mA output cur-
rent using a current-steering configuration. This current-
steering approach induces less ground bounce and no
shoot-through current, enhancing noise margin and sys-
tem speed performance. The driver outputs are short-
circuit current limited, and enter a high-impedance state
when the device is not powered or is disabled.
The current-steering architecture of the MAX9178 requires
a resistive load to terminate the signal and complete the
transmission loop. Because the device switches current
and not voltage, the actual output voltage swing is
determined by the value of the termination resistor at
the input of an LVDS receiver. Logic states are deter-
mined by the direction of current flow through the termi-
nation resistor. With a typical 3.7mA output current, the
MAX9178 produces an output voltage of 370mV when
driving a 100
load.
Termination
The termination resistors should match the differential
impedance of the transmission line. Output voltage levels
depend upon the value of the termination resistor. The
MAX9178 is optimized for point-to-point interface with 100
termination resistors at the receiver inputs. Termination
resistance values may range between 90
and 132
,
depending on the characteristic impedance of the transmis-
sion medium. Table 1 lists the I/O functions.
Termination Detection
The MAX9178 has a limited-capability termination
detection circuit at each output that drives the output
high when the output termination is removed (or is not
present at power-up), and starts the output switching
when a termination is connected. These circuits pre-
vent EMI and crosstalk that occur (due to reflections) if
an unterminated line is driven.
Bench testing with CAT-5E unshielded twisted-pair
cable showed the termination detection working for the
cable lengths and frequencies listed in Table 2. Other
combinations of cable length and frequency are possible.
The termination detection worked with 30m of CAT-5 at
3MHz and with alternating 3MHz and 9MHz. The termi-
nation detection is prevented from working at various
cable lengths, switching frequencies, and data patterns
by reflections that discharge the detection circuit.
Applications Information
Power-Supply Bypassing
Bypass V
CC
with high-frequency, surface-mount
ceramic 0.1μF and 0.001μF capacitors in parallel as
close to the device as possible, with the smaller valued
capacitor closest to V
CC
.
Differential Traces
Output trace characteristics affect the performance of
the MAX9178. Use controlled-impedance traces to
match trace impedance to the transmission medium.
Eliminate reflections and ensure that noise couples as
common mode by running the differential trace pairs
close together. Reduce skew by matching the electrical
length of the traces. Excessive skew can result in a
degradation of magnetic field cancellation.
M
Quad LVDS Line Driver with High-ESD
Tolerance and Flow-Through Pinout
_______________________________________________________________________________________
9
ENABLES
EN
INPUTS
IN_
L
H
OUTPUTS
OUT_+
L
H
EN
OUTPUT
LOAD
OUT_-
H
L
H
L or
open
Connected
All other
combinations of
enable inputs
X
X
Z
Z
Z = High impedance.
X = Don’t care.
Table 1. Input/Output Function Table
CONDITIONS
CABLE
LENGTH (m)
TYPICAL
SWITCHING
FREQUENCY
(MHz)
1
10.75
2
8.5
100
cable termination,
5pF load (each output to
ground), 10% to 90%
duty cycle
4
7.8
Table 2. Cable Lengths and Frequencies
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX9178EUE | Quad LVDS Line Driver with High-ESD Tolerance and Flow-Through Pinout |
| MAX9179ETE | Quad LVDS Receiver with Hysteresis |
| MAX9179EUE | Quad LVDS Receiver with Hysteresis |
| MAX9180EXT-T | 400Mbps, Low-Jitter, Low-Noise LVDS Repeater in an SC70 Package |
| MAX9205EVKIT | Evaluation Kit for the MAX9205/MAX9206/MAX9207/MAX9208 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9178ETE-T | 功能描述:LVDS 接口集成電路 RoHS:否 制造商:Texas Instruments 激勵(lì)器數(shù)量:4 接收機(jī)數(shù)量:4 數(shù)據(jù)速率:155.5 Mbps 工作電源電壓:5 V 最大功率耗散:1025 mW 最大工作溫度:+ 85 C 封裝 / 箱體:SOIC-16 Narrow 封裝:Reel |
| MAX9178EUE | 功能描述:LVDS 接口集成電路 RoHS:否 制造商:Texas Instruments 激勵(lì)器數(shù)量:4 接收機(jī)數(shù)量:4 數(shù)據(jù)速率:155.5 Mbps 工作電源電壓:5 V 最大功率耗散:1025 mW 最大工作溫度:+ 85 C 封裝 / 箱體:SOIC-16 Narrow 封裝:Reel |
| MAX9178EUE-T | 功能描述:LVDS 接口集成電路 RoHS:否 制造商:Texas Instruments 激勵(lì)器數(shù)量:4 接收機(jī)數(shù)量:4 數(shù)據(jù)速率:155.5 Mbps 工作電源電壓:5 V 最大功率耗散:1025 mW 最大工作溫度:+ 85 C 封裝 / 箱體:SOIC-16 Narrow 封裝:Reel |
| MAX9179 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Quad LVDS Receiver with Hysteresis |
| MAX9179AEUE | 制造商:Maxim Integrated Products 功能描述:QUAD LVDS RECEIVER WITH HYSTERESIS - Rail/Tube |
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