Product
Folder
Sample &
Buy
Support &
Community
Tools &
Software
Technical
Documents
DS90LV048A
SNLS045C – JULY 1999 – REVISED JULY 2016
DS90LV048A 3-V LVDS Quad CMOS Differential Line Receiver
1 Features
3 Description
•
•
•
•
•
•
•
•
•
•
The DS90LV048A device is a quad CMOS flowthrough differential line receiver designed for
applications requiring ultra-low power dissipation and
high data rates. The device is designed to support
data rates in excess of 400 Mbps (200 MHz) using
Low
Voltage
Differential
Signaling
(LVDS)
technology.
1
•
•
•
•
•
> 400-Mbps (200-MHz) Switching Rates
Flow-Through Pinout Simplifies PCB Layout
150-ps Channel-to-Channel Skew (Typical)
100-ps Differential Skew (Typical)
2.7-ns Maximum Propagation Delay
3.3-V Power Supply Design
High Impedance LVDS Inputs on Power Down
Low Power Design (40 mW at 3.3-V Static)
Interoperable With Existing 5-V LVDS Drivers
Accepts Small Swing (350 mV Typical) Differential
Signal Levels
Supports Input Failsafe
– Open, Short, and Terminated
0 V to −100 mV Threshold Region
Conforms to ANSI/TIA/EIA-644 Standard
Operating Temperature Range: –40°C to +85°C
Available in SOIC and TSSOP Package
2 Applications
•
•
Multifunction Printers
LVDS - LVCMOS Translation
The DS90LV048A accepts low voltage (350 mV
typical) differential input signals and translates them
to 3-V CMOS output levels. The receiver supports a
TRI-STATE function that may be used to multiplex
outputs. The receiver also supports open, shorted,
and terminated (100-Ω) input fail-safe. The receiver
output is HIGH for all fail-safe conditions. The
DS90LV048A has a flow-through pinout for easy PCB
layout.
The EN and EN* inputs are ANDed together and
control the TRI-STATE outputs. The enables are
common to all four receivers. The DS90LV048A and
companion LVDS line driver (for example,
DS90LV047A) provide a new alternative to highpower PECL/ECL devices for high-speed point-topoint interface applications.
Device Information(1)
PART NUMBER
DS90LV048A
PACKAGE
BODY SIZE (NOM)
SOIC (16)
9.90 mm × 3.91 mm
TSSOP (16)
5.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Functional Diagram
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
DS90LV048A
SNLS045C – JULY 1999 – REVISED JULY 2016
www.ti.com
Table of Contents
1
2
3
4
5
6
7
8
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
3
6.1
6.2
6.3
6.4
6.5
6.6
6.7
3
4
4
4
4
5
6
Absolute Maximum Ratings ......................................
ESD Ratings..............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics...........................................
Switching Characteristics ..........................................
Typical Characteristics ..............................................
Parameter Measurement Information .................. 9
Detailed Description ............................................ 10
8.1 Overview ................................................................. 10
8.2 Functional Block Diagram ....................................... 10
8.3 Feature Description................................................. 11
8.4 Device Functional Modes........................................ 11
9
Application and Implementation ........................ 12
9.1 Application Information............................................ 12
9.2 Typical Application ................................................. 12
10 Power Supply Recommendations ..................... 13
11 Layout................................................................... 13
11.1 Layout Guidelines ................................................. 13
11.2 Layout Example .................................................... 14
12 Device and Documentation Support ................. 15
12.1
12.2
12.3
12.4
12.5
12.6
Documentation Support ........................................
Receiving Notification of Documentation Updates
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
15
15
15
15
15
15
13 Mechanical, Packaging, and Orderable
Information ........................................................... 15
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (April 2013) to Revision C
•
Added ESD Ratings table, Thermal Information table, Feature Description section, Device Functional Modes,
Application and Implementation section, Power Supply Recommendations section, Layout section, Device and
Documentation Support section, and Mechanical, Packaging, and Orderable Information section....................................... 1
Changes from Revision A (April 2013) to Revision B
•
2
Page
Page
Changed layout of National Semiconductor Data Sheet to TI format .................................................................................... 8
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
Product Folder Links: DS90LV048A
DS90LV048A
www.ti.com
SNLS045C – JULY 1999 – REVISED JULY 2016
5 Pin Configuration and Functions
D or PW Package
16-Pin SOIC or TSSOP
Top View
Pin Functions
PIN
NAME
NO.
I/O
DESCRIPTION
EN
16
I
Receiver enable pin: When EN is low, the receiver is disabled. When EN is high and EN* is low
or open, the receiver is enabled. If both EN and EN* are open circuit, then the receiver is
disabled.
EN*
9
I
Receiver enable pin: When EN* is high, the receiver is disabled. When EN* is low or open and
EN is high, the receiver is enabled. If both EN and EN* are open circuit, then the receiver is
disabled.
GND
12
—
RIN+
2, 3, 6, 7
I
Noninverting receiver input pin
RIN−
1, 4, 5, 8
I
Inverting receiver input pin
ROUT
10, 11, 14,
15
O
VCC
13
—
Ground pin
Receiver output pin
Power supply pin, +3.3V ± 0.3V
6 Specifications
6.1 Absolute Maximum Ratings
See
(1) (2)
MIN
MAX
UNIT
Supply voltage (VCC)
–0.3
4
V
Input voltage (RIN+, RIN−)
–0.3
3.6
V
Enable input voltage (EN, EN*)
–0.3
VCC + 0.3
V
–0.3
VCC + 0.3
V
Output voltage (ROUT)
Maximum package power dissipation
at +25°C
Lead temperature soldering
D0016A package
1025
PW0016A package
866
Derate D0016A
package
above +25°C
8.2
Derate PW0016A
package
above +25°C
6.9
mW/°C
(4 s)
Maximum junction temperature
Storage temperature, Tstg
(1)
(2)
mW
–65
260
°C
150
°C
150
°C
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
Product Folder Links: DS90LV048A
3
DS90LV048A
SNLS045C – JULY 1999 – REVISED JULY 2016
www.ti.com
6.2 ESD Ratings
VALUE
Electrostatic discharge (1)
V(ESD)
(1)
Human-body model (HBM)
±10000
Machine model
±1200
UNIT
V
ESD Rating:
HBM (1.5 kΩ, 100 pF)
EIAJ (0 Ω, 200 pF)
6.3 Recommended Operating Conditions
Supply voltage, VCC
Receiver input voltage
MIN
NOM
MAX
3
3.3
3.6
GND
−40
Operating free air temperature, TA
25
UNIT
V
3
V
85
°C
6.4 Thermal Information
DS90LV048A
THERMAL METRIC
(1)
PW (TSSOP)
UNIT
16 PINS
RθJA
Junction-to-ambient thermal resistance
RθJC(top)
Junction-to-case (top) thermal resistance
RθJB
ψJT
ψJB
(1)
110.2
°C/W
47
°C/W
Junction-to-board thermal resistance
54.7
°C/W
Junction-to-top characterization parameter
6.1
°C/W
Junction-to-board characterization parameter
54.2
°C/W
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
6.5 Electrical Characteristics
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified. (1) (2)
PARAMETER
VTH
Differential input high threshold
VTL
Differential input low threshold
VCMR
Common-mode voltage range
IIN
Input current
TEST CONDITIONS
VCM = +1.2 V, 0.05 V, 2.95 V (3)
VID = 200 mV peak to peak? (4)
VOL
Output low voltage
0.1
10
±1
20
IOH = −0.4 mA, VID = +200 mV
2.7
3.3
IOH = −0.4 mA, input terminated
2.7
3.3
IOH = −0.4 mA, input shorted
2.7
3.3
IOL = 2 mA, VID = −200 mV
(5)
Disabled, VOUT = 0 V or VCC
ROUT
UNIT
mV
mV
2.3
–20
VCC = 0 V
Enabled, VOUT = 0 V
4
0
−35
10
Output TRI-STATE current
(5)
−35
±1
Output short-circuit current
(4)
MAX
±5
IOZ
(2)
(3)
RIN+,
RIN−
VCC = 3.6 V or 0 V
IOS
(1)
−100
TYP
−10
VIN = 0 V
VIN = +3.6 V
Output high voltage
MIN
−10
VIN = +2.8 V
VOH
PIN
V
μA
V
0.05
0.25
V
−15
−47
−100
mA
−10
±1
10
μA
Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground
unless otherwise specified.
All typicals are given for: VCC = 3.3 V, TA = 25°C.
VCC is always higher than RIN+ and RIN− voltage. RIN− and RIN+ are allowed to have a voltage range −0.2 V to VCC− VID/2. However, to
be compliant with AC specifications, the common voltage range is 0.1 V to 2.3 V.
The VCMR range is reduced for larger VID. Example: if VID = 400 mV, the VCMR is 0.2 V to 2.2 V. The fail-safe condition with inputs
shorted is not supported over the common-mode range of 0 V to 2.4 V, but is supported only with inputs shorted and no external
common-mode voltage applied. A VID up to VCC – 0 V may be applied to the RIN+/ RIN− inputs with the Common-Mode voltage set to
VCC/2. Propagation delay and Differential Pulse skew decrease when VID is increased from 200 mV to 400 mV. Skew specifications
apply for 200 mV ≤ VID ≤ 800 mV over the common-mode range.
Output short-circuit current (IOS) is specified as magnitude only; minus sign indicates direction only. Only one output should be shorted
at a time; do not exceed maximum junction temperature specification.
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
Product Folder Links: DS90LV048A
DS90LV048A
www.ti.com
SNLS045C – JULY 1999 – REVISED JULY 2016
Electrical Characteristics (continued)
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified.(1)(2)
PARAMETER
TEST CONDITIONS
VIH
Input high voltage
VIL
Input low voltage
II
Input current
VIN = 0 V or VCC, other Input = VCC or GND
VCL
Input clamp voltage
ICL = −18 mA
ICC
No load supply current
receivers enabled
EN = VCC, inputs open
No load supply current
receivers disabled
EN = GND, inputs open
ICCZ
PIN
MIN
EN,
EN*
TYP
MAX
UNIT
2
VCC
V
GND
0.8
V
10
μA
−10
±5
−1.5
−0.8
V
9
15
mA
1
5
mA
VCC
6.6 Switching Characteristics
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified. (1) (2) (3) (4)
MIN
TYP
MAX
tPHLD
Differential propagation delay high to low
PARAMETER
TEST CONDITIONS
1.2
2
2.7
ns
tPLHD
Differential propagation delay low to high
1.2
1.9
2.7
ns
tSKD1
Differential pulse skew |tPHLD − tPLHD| (5)
0
0.1
0.4
ns
tSKD2
Differential channel-to-channel skew; same
device (3)
0
0.15
0.5
ns
(4)
tSKD3
Differential part-to-part skew
tSKD4
Differential part-to-part skew (6)
tTLH
Rise time
tTHL
Fall time
tPHZ
Disable time high to Z
tPLZ
Disable time low to Z
tPZH
Enable time Z to high
tPZL
Enable time Z to low
fMAX
Maximum operating frequency (7)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
CL = 15 pF
VID = 200 mV
(Figure 15 and Figure 16)
RL = 2 kΩ
CL = 15 pF
(Figure 17 and Figure 18)
All channels switching
200
UNIT
1
ns
1.5
ns
0.5
1
ns
0.35
1
ns
8
14
ns
8
14
ns
9
14
ns
9
14
250
ns
MHz
All typicals are given for: VCC = 3.3 V, TA = 25°C.
Generator waveform for all tests unless otherwise specified: f = 1 MHz, ZO = 50 Ω, tr and tf (0% to 100%) ≤ 3 ns for RIN.
tSKD2, channel-to-channel skew is defined as the difference between the propagation delay of one channel and that of the others on the
same chip with any event on the inputs.
tSKD3, part-to-part skew, is the differential channel-to-channel skew of any event between devices. This specification applies to devices
at the same VCC, and within 5°C of each other within the operating temperature range.
tSKD1 is the magnitude difference in differential propagation delay time between the positive going edge and the negative going edge of
the same channel
tSKD4, part-to-part skew, is the differential channel-to-channel skew of any event between devices. This specification applies to devices
over recommended operating temperature and voltage ranges, and across process distribution. tSKD4 is defined as |Max−Min| differential
propagation delay.
fMAX generator input conditions: tr = tf < 1 ns (0% to 100%), 50% duty cycle, differential (1.05-V to 1.35-V peak to peak). Output criteria:
60 / 40% duty cycle, VOL (maximum 0.4 V), VOH (minimum 2.7 V), Load = 15 pF (stray plus probes).
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
Product Folder Links: DS90LV048A
5
DS90LV048A
SNLS045C – JULY 1999 – REVISED JULY 2016
www.ti.com
6.7 Typical Characteristics
6
Figure 1. Output High Voltage vs Power Supply Voltage
Figure 2. Output Low Voltage vs Power Supply Voltage
Figure 3. Output Short-Circuit Current vs Power Supply
Voltage
Figure 4. Output TRI-STATE Current vs Power Supply
Voltage
Figure 5. Differential Transition Voltage vs Power Supply
Voltage
Figure 6. Power Supply Current vs Ambient Temperature
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
Product Folder Links: DS90LV048A
DS90LV048A
www.ti.com
SNLS045C – JULY 1999 – REVISED JULY 2016
Typical Characteristics (continued)
Figure 7. Differential Propagation Delay vs Power Supply
Voltage
Figure 8. Differential Propagation Delay vs Ambient
Temperature
Figure 9. Differential Propagation Delay vs Differential Input
Voltage
Figure 10. Differential Propagation Delay vs Common-Mode
Voltage
Figure 11. Differential Skew vs Power Supply Voltage
Figure 12. Differential Skew vs Ambient Temperature
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
Product Folder Links: DS90LV048A
7
DS90LV048A
SNLS045C – JULY 1999 – REVISED JULY 2016
www.ti.com
Typical Characteristics (continued)
Figure 13. Transition Time vs Power Supply Voltage
8
Figure 14. Transition Time vs Ambient Temperature
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
Product Folder Links: DS90LV048A
DS90LV048A
www.ti.com
SNLS045C – JULY 1999 – REVISED JULY 2016
7 Parameter Measurement Information
Figure 15. Receiver Propagation Delay and Transition Time Test Circuit
Figure 16. Receiver Propagation Delay and Transition Time Waveforms
CL includes load and test jig capacitance.
S1 = VCC for tPZL and tPLZ measurements.
S1 = GND for tPZH and tPHZ measurements.
Figure 17. Receiver TRI-STATE Delay Test Circuit
Figure 18. Receiver TRI-STATE Delay Waveforms
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
Product Folder Links: DS90LV048A
9
DS90LV048A
SNLS045C – JULY 1999 – REVISED JULY 2016
www.ti.com
8 Detailed Description
8.1 Overview
LVDS drivers and receivers are intended to be primarily used in an uncomplicated point-to-point configuration as
shown in Figure 19. This configuration provides a clean signaling environment for the fast edge rates of the
drivers. The receiver is connected to the driver through a balanced media which may be a standard twisted pair
cable, a parallel pair cable, or simply PCB traces. Typically, the characteristic impedance of the media is in the
range of 100 Ω. A termination resistor of 100 Ω (selected to match the media) is located as close to the receiver
input pins as possible. The termination resistor converts the driver output (current mode) into a voltage that is
detected by the receiver. Other configurations are possible such as a multi-receiver configuration, but the effects
of a mid-stream connector(s), cable stub(s), and other impedance discontinuities as well as ground shifting, noise
margin limits, and total termination loading must be considered.
The DS90LV048A differential line receiver is capable of detecting signals as low as 100 mV, over a ±1-V
common-mode range centered around +1.2 V. This is related to the driver offset voltage which is typically +1.2 V.
The driven signal is centered around this voltage and may shift ±1 V around this center point. The ±1-V shifting
may be the result of a ground potential difference between the ground reference of the driver and the ground
reference of the receiver, the common-mode effects of coupled noise, or a combination of the two. The AC
parameters of both receiver input pins are optimized for a recommended operating input voltage range of 0 V to
+2.4 V (measured from each pin to ground). The device operates for receiver input voltages up to VCC, but
exceeding VCC turns on the ESD protection circuitry, which clamps the bus voltages.
The DS90LV048A has a flow-through pinout that allows for easy PCB layout. The LVDS signals on one side of
the device easily allows for matching electrical lengths of the differential pair trace lines between the driver and
the receiver as well as allowing the trace lines to be close together to couple noise as common-mode. Noise
isolation is achieved with the LVDS signals on one side of the device and the TTL signals on the other side.
8.2 Functional Block Diagram
10
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
Product Folder Links: DS90LV048A
DS90LV048A
www.ti.com
SNLS045C – JULY 1999 – REVISED JULY 2016
8.3 Feature Description
8.3.1 Fail-Safe Feature
The LVDS receiver is a high-gain, high-speed device that amplifies a small differential signal (20 mV) to CMOS
logic levels. Due to the high gain and tight threshold of the receiver, take care to prevent noise from appearing as
a valid signal.
The internal fail-safe circuitry of the receiver is designed to source or 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 DS90LV048A is a quad receiver device, and if an application requires only 1, 2, or 3
receivers, the unused channel(s) inputs must be left OPEN. Do not tie unused receiver inputs to ground or
any other voltages. The input is biased by internal high value pullup and pulldown resistors to set the output
to a HIGH state. This internal circuitry ensures 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 is again 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 10 mV of differential noise, the receiver may see the noise as
a valid signal and switch. To ensure that any noise is seen as common-mode and not differential, a balanced
interconnect should be used. Twisted pair cable offers better balance than flat ribbon cable.
3. Shorted Inputs. If a fault condition occurs that shorts the receiver inputs together, thus resulting in a 0-V
differential input voltage, the receiver output remains in a HIGH state. Shorted input fail-safe is not supported
across the common-mode range of the device (GND to 2.4 V). It is only supported with inputs shorted and no
external common-mode voltage applied.
External lower value pullup and pulldown resistors (for a stronger bias) may be used to boost fail-safe in the
presence of higher noise levels. The pullup and pulldown resistors must be in the 5-kΩ to 15-kΩ range to
minimize loading and waveform distortion to the driver. The common-mode bias point must be set to
approximately 1.2 V (less than 1.75 V) to be compatible with the internal circuitry.
Additional information on fail-safe biasing of LVDS devices may be found in AN-1194 Failsafe Biasing of LVDS
Interfaces (SNLA051).
8.4 Device Functional Modes
Table 1 lists the functional modes of the DS90LV048A.
Table 1. Truth Table
ENABLES
EN
H
EN*
L or Open
All other combinations of ENABLE inputs
INPUT
OUTPUT
RIN+ − RIN−
ROUT
VID ≥ 0 V
H
VID ≤ −0.1 V
L
Full Fail-safe
OPEN/SHORT or
Terminated
H
X
Z
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
Product Folder Links: DS90LV048A
11
DS90LV048A
SNLS045C – JULY 1999 – REVISED JULY 2016
www.ti.com
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The DS90LV048A has a flow-through pinout that allows for easy PCB layout. The LVDS signals on one side of
the device easily allows for matching electrical lengths of the differential pair trace lines between the driver and
the receiver as well as allowing the trace lines to be close together to couple noise as common-mode. Noise
isolation is achieved with the LVDS signals on one side of the device and the TTL signals on the other side.
9.2 Typical Application
Figure 19. Balanced System Point-to-Point Application
9.2.1 Design Requirements
When using LVDS devices, it is important to remember to specify controlled impedance PCB traces, cable
assemblies, and connectors. All components of the transmission media must have a matched differential
impedance of about 100 Ω. They must not introduce major impedance discontinuities.
Balanced cables (for example, twisted pair) are usually better than unbalanced cables (ribbon cable) 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
LVDS receiver.
For cable distances < 0.5 M, most cables can be made to work effectively. For distances 0.5 M ≤ d ≤ 10 M,
CAT5 (Category 5) twisted pair cable works well, is readily available, and relatively inexpensive.
9.2.2 Detailed Design Procedure
9.2.2.1 Probing LVDS Transmission Lines
Always use high impedance (> 100kΩ), low capacitance (< 2 pF) scope probes with a wide bandwidth (1 GHz)
scope. Improper probing gives deceiving results.
9.2.2.2 Threshold
The LVDS Standard (ANSI/TIA/EIA-644) specifies a maximum threshold of ±100 mV for the LVDS receiver. The
DS90LV048A supports an enhanced threshold region of −100 mV to 0 V. This is useful for fail-safe biasing. The
threshold region is shown in the Voltage Transfer Curve (VTC) in Figure 20. The typical DS90LV048A LVDS
receiver switches at about −35 mV.
NOTE
With VID = 0 V, the output is in a HIGH state. With an external fail-safe bias of +25 mV
applied, the typical differential noise margin is now the difference from the switch point to
the bias point.
In the following example, this would be 60 mV of Differential Noise Margin (+25 mV − (−35 mV)). With the
enhanced threshold region of −100 mV to 0 V, this small external fail-safe biasing of +25 mV (with respect to
12
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
Product Folder Links: DS90LV048A
DS90LV048A
www.ti.com
SNLS045C – JULY 1999 – REVISED JULY 2016
Typical Application (continued)
0 V) gives a DNM of a comfortable 60 mV. With the standard threshold region of ±100 mV, the external fail-safe
biasing would need to be +25 mV with respect to +100 mV or +125 mV, giving a DNM of 160 mV which is
stronger fail-safe biasing than is necessary for the DS90LV048A. If more DNM is required, then a stronger failsafe bias point can be set by changing resistor values.
Figure 20. VTC of the DS90LV048A LVDS Receiver
9.2.3 Application Curve
Figure 21. Power Supply Current vs Frequency
10 Power Supply Recommendations
Although the DS90LV047A draws very little power while at rest, its overall power consumption increases due to a
dynamic current component. The DS90LV048A power supply connection must take this additional current
consumption into consideration for maximum power requirements.
11 Layout
11.1 Layout Guidelines
•
•
•
Use at least 4 PCB layers (top to bottom): LVDS signals, ground, power, and TTL signals.
Isolate TTL signals from LVDS signals, otherwise the TTL may couple onto the LVDS lines. Best practice is to
put TTL and LVDS signals on different layers which are isolated by a power/ground plane(s).
Keep drivers and receivers as close to the (LVDS port side) connectors as possible.
11.1.1 Power Decoupling Recommendations
Bypass capacitors must be used on power pins. Use high-frequency ceramic (surface mount is recommended)
0.1-μF and 0.001-μF capacitors in parallel at the power supply pin with the smallest value capacitor closest to the
device supply pin. Additional scattered capacitors over the printed-circuit board improves decoupling. Multiple
vias must be used to connect the decoupling capacitors to the power planes. A 10-μF (35-V) or greater solid
tantalum capacitor must be connected at the power entry point on the printed-circuit board between the supply
and ground.
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
Product Folder Links: DS90LV048A
13
DS90LV048A
SNLS045C – JULY 1999 – REVISED JULY 2016
www.ti.com
Layout Guidelines (continued)
11.1.2 Differential Traces
Use controlled impedance traces that match the differential impedance of your transmission medium (that is,
cable) and termination resistor. Run the differential pair trace lines as close together as possible as soon as they
leave the IC (stubs must be < 10 mm long). This helps eliminate reflections and ensure noise is coupled as
common-mode. In fact, we have seen that differential signals which are 1 mm apart radiate far less noise than
traces 3 mm apart because magnetic field cancellation is much better with the closer traces. In addition, noise
induced on the differential lines is much more likely to appear as common-mode which is rejected by the
receiver.
Match electrical lengths between traces to reduce skew. Skew between the signals of a pair means a phase
difference between signals, which destroys the magnetic field cancellation benefits of differential signals and
EMI, results. Remember the velocity of propagation, v = c/Er where c (the speed of light) = 0.2997 mm/ps or
0.0118 in/ps.
Do not rely solely on the autoroute function for differential traces. Carefully review dimensions to match
differential impedance and provide isolation for the differential lines. Minimize the number or vias and other
discontinuities on the line.
Avoid 90° turns (these cause impedance discontinuities). Use arcs or 45° bevels.
Within a pair of traces, the distance between the two traces should be minimized to maintain common-mode
rejection of the receivers. On the printed-circuit board, this distance must remain constant to avoid discontinuities
in differential impedance. Minor violations at connection points are allowable.
11.1.3 Termination
Use a termination resistor that best matches the differential impedance or your transmission line. The resistor
must be between 90 Ω and 130 Ω. Remember that the current mode outputs need the termination resistor to
generate the differential voltage. LVDS does not work without resistor termination. Typically, connecting a single
resistor across the pair at the receiver end will suffice.
Surface mount 1% to 2% resistors are best. PCB stubs, component lead, and the distance from the termination
to the receiver inputs must be minimized. The distance between the termination resistor and the receiver must be
< 10 mm (12 mm maximum).
11.2 Layout Example
DS90LV048A
DS90LV047A
LVCMOS
Inputs
DOUT1-
16
1
RIN1-
EN
16
DIN1
DOUT1+
15
2
RIN1+
ROUT1
15
3
DIN2
DOUT2+
14
3
RIN2+
ROUT2
14
4
VCC
DOUT2-
13
4
RIN2-
VCC
13
5
GND
DOUT3-
12
5
RIN3-
GND
12
11
6
RIN3+
ROUT3
11
7
RIN4+
ROUT4
10
8
RIN4-
EN*
9
1
EN
2
Series Termination (optional)
LVCMOS
Outputs
Decoupling Cap
Decoupling Cap
6
DIN3
DOUT3+
7
DIN4
DOUT4+
10
8
EN*
DOUT4-
9
Series Termination (optional)
Input Termination
(Required)
Figure 22. Layout Recommendation
14
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
Product Folder Links: DS90LV048A
DS90LV048A
www.ti.com
SNLS045C – JULY 1999 – REVISED JULY 2016
12 Device and Documentation Support
12.1 Documentation Support
12.1.1 Related Documentation
For related documentation, see the following:
• LVDS Owner's Manual (SNLA187)
• AN-808 Long Transmission Lines and Data Signal Quality (SNLA028)
• AN-977 LVDS Signal Quality: Jitter Measurements Using Eye Patterns Test Report #1SNLA166)
• AN-971 An Overview of LVDS Technology (SNLA165)
• AN-916 A Practical Guide to Cable Selection (SNLA219)
• AN-805 Calculating Power Dissipation for Differential Line Drivers (SNOA233)
• AN-903 A Comparison of Differential Termination Techniques (SNLA034)
• AN-1194 Failsafe Biasing of LVDS Interfaces (SNLA051)
12.2 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
12.3 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
12.4 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
12.5 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
12.6 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
13 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
Product Folder Links: DS90LV048A
15
PACKAGE OPTION ADDENDUM
www.ti.com
30-Sep-2021
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
DS90LV048ATM
NRND
SOIC
D
16
48
Non-RoHS
& Green
Call TI
Level-1-235C-UNLIM
-40 to 85
DS90LV048A
TM
DS90LV048ATM/NOPB
ACTIVE
SOIC
D
16
48
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 85
DS90LV048A
TM
DS90LV048ATMTC
NRND
TSSOP
PW
16
92
Non-RoHS
& Green
Call TI
Level-1-260C-UNLIM
-40 to 85
DS90LV
048AT
DS90LV048ATMTC/NOPB
ACTIVE
TSSOP
PW
16
92
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 85
DS90LV
048AT
DS90LV048ATMTCX
NRND
TSSOP
PW
16
2500
Non-RoHS
& Green
Call TI
Level-1-260C-UNLIM
-40 to 85
DS90LV
048AT
DS90LV048ATMTCX/NOPB
ACTIVE
TSSOP
PW
16
2500
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 85
DS90LV
048AT
DS90LV048ATMX/NOPB
ACTIVE
SOIC
D
16
2500
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 85
DS90LV048A
TM
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
工商网监
湘ICP备2023018690号
