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DS90LV032ATM Datasheet(PDF) 8 Page - Texas Instruments

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Part # DS90LV032ATM
Description  DS90LV032A 3V LVDS Quad CMOS Differential Line Receiver
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DS90LV032ATM Datasheet(HTML) 8 Page - Texas Instruments

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DS90LV032A
SNLS011C – JULY 1999 – REVISED APRIL 2013
www.ti.com
Termination
Use a resistor which best matches the differential impedance of your transmission line. The resistor should be
between 90
Ω and 130Ω. Remember that the current mode outputs need the termination resistor to generate the
differential voltage. LVDS will not work without resistor termination. Typically, connect a single resistor across the
pair at the receiver end.
Surface mount 1% to 2% resistors are best. PCB stubs, component lead, and the distance from the termination
to the receiver inputs should be minimized. The distance between the termination resistor and the receiver
should be <10mm (12mm MAX)
Probing LVDS Transmission Lines
Always use high impedance (> 100k
Ω), low capacitance (< 2 pF) scope probes with a wide bandwidth (1 GHz)
scope. Improper probing will give deceiving results.
Cables and Connectors, General Comments
When choosing cable and connectors for LVDS it is important to remember:
Use controlled impedance media. The cables and connectors you use should have a matched differential
impedance of about 100
Ω. They should not introduce major impedance discontinuities.
Balanced cables (e.g. twisted pair) are usually better than unbalanced cables (ribbon cable, simple coax.) for
noise reduction and signal quality. Balanced cables tend to generate less EMI due to field canceling effects and
also tend to pick up electromagnetic radiation as common-mode (not differential mode) noise which is rejected by
the receiver. For cable distances < 0.5M, most cables can be made to work effectively. For distances 0.5M
≤ d ≤
10M, CAT 3 (category 3) twisted pair cable works well, is readily available and relatively inexpensive.
Fail-Safe Feature
The LVDS receiver is a high gain, high speed device that amplifies a small differential signal (20mV) to CMOS
logic levels. Due to the high gain and tight threshold of the receiver, care should be taken to prevent noise from
appearing as a valid signal.
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.
The footprint of the DS90LV032A is the same as the industry standard 26LS32 Quad Differential (RS-422)
Receiver.
8
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Product Folder Links: DS90LV032A


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