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DS90LV031AQML Datasheet(PDF) 8 Page - Texas Instruments

Part No. DS90LV031AQML
Description  3V LVDS Quad CMOS Differential Line Driver
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DS90LV031AQML Datasheet(HTML) 8 Page - Texas Instruments

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DS90LV031AQML
SNLS204A – NOVEMBER 2011 – REVISED APRIL 2013
www.ti.com
The receiver's internal fail-safe circuitry is designed to source/sink a small amount of current, providing fail-safe
protection (a stable known state of HIGH output voltage) for floating, terminated or shorted receiver inputs.
1. Open Input Pins. The DS90LV032A is a quad receiver device, and if an application requires only 1, 2 or 3
receivers, the unused channel(s) inputs should be left OPEN. Do not tie unused receiver inputs to ground or
any other voltages. The input is biased by internal high value pull up and pull down resistors to set the output
to a HIGH state. This internal circuitry will ensure a HIGH, stable output state for open inputs.
2. Terminated Input. If the driver is disconnected (cable unplugged), or if the driver is in a TRI-STATE or
power-off condition, the receiver output will again be in a HIGH state, even with the end of cable 100
Ω
termination resistor across the input pins. The unplugged cable can become a floating antenna which can
pick up noise. If the cable picks up more than 10mV of differential noise, the receiver may see the noise as a
valid signal and switch. To insure that any noise is seen as common-mode and not differential, a balanced
interconnect should be used. Twisted pair cable will offer better balance than flat ribbon cable.
3. Shorted Inputs. If a fault condition occurs that shorts the receiver inputs together, thus resulting in a 0V
differential input voltage, the receiver output will remain in a HIGH state. Shorted input fail-safe is not
supported across the common-mode range of the device (GND to 2.4V). It is only supported with inputs
shorted and no external common-mode voltage applied.
External lower value pull up and pull down resistors (for a stronger bias) may be used to boost fail-safe in the
presence of higher noise levels. The pull up and pull down resistors should be in the 5k
Ω to 15kΩ range to
minimize loading and waveform distortion to the driver. The common-mode bias point should be set to
approximately 1.2V (less than 1.75V) to be compatible with the internal circuitry.
Figure 7. Driver Output Levels
Pin Descriptions
Pin No.
Name
Description
1, 7, 9, 15
DI
Driver input pin, TTL/CMOS compatible
2, 6, 10, 14
DO+
Non-inverting driver output pin, LVDS levels
3, 5, 11, 13
DO
Inverting driver output pin, LVDS levels
4
En
Active high enable pin, OR-ed with En*
12
En*
Active low enable pin, OR-ed with En
16
VCC
Power supply pin, +3.3V ± 0.3V
8
Gnd
Ground pin
8
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Product Folder Links: DS90LV031AQML


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