DS25BR120TSD/NOPB National Semiconductor, DS25BR120TSD/NOPB Datasheet

IC BUFFER LVDS 3.125GBPS 8-LLP

DS25BR120TSD/NOPB

Manufacturer Part Number
DS25BR120TSD/NOPB
Description
IC BUFFER LVDS 3.125GBPS 8-LLP
Manufacturer
National Semiconductor
Type
Bufferr
Datasheet

Specifications of DS25BR120TSD/NOPB

Tx/rx Type
LVDS
Delay Time
465ps
Capacitance - Input
1.7pF
Voltage - Supply
3 V ~ 3.6 V
Current - Supply
106mA
Mounting Type
Surface Mount
Package / Case
8-LLP
Device Type
Differential Buffer
Supply Current Max
43mA
Peak-to-peak Jitter Max
65ps
Signaling Rate
3.125Gbps
Signal Input Type
LVDS
Output Level Type
LVDS
Supply Voltage Range
3V To 3.6V
Rohs Compliant
Yes
Supply Current
43mA
Driver Case Style
LLP
No. Of Pins
8
Operating Temperature Range
-40°C To +85°C
Msl
MSL 3 - 168 Hours
Amplifier Output
Fully Differential
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
DS25BR120TSDTR

Available stocks

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Part Number
Manufacturer
Quantity
Price
Part Number:
DS25BR120TSD/NOPB
Manufacturer:
NSC
Quantity:
2 283
Part Number:
DS25BR120TSD/NOPB
Manufacturer:
TI/德州仪器
Quantity:
20 000
Part Number:
DS25BR120TSD/NOPB
0
© 2007 National Semiconductor Corporation
DS25BR120
3.125 Gbps LVDS Buffer with Transmit Pre-Emphasis
General Description
The DS25BR120 is a single channel 3.125 Gbps LVDS buffer
optimized for high-speed signal transmission over lossy FR-4
printed circuit board backplanes and balanced metallic ca-
bles. Fully differential signal paths ensure exceptional signal
integrity and noise immunity.
The DS25BR120 features four levels of pre-emphasis (PE)
for use as an optimized driver device. Other LVDS devices
with similar IO characteristics include the following products.
The DS25BR110 features four levels of equalization for use
as an optimized receiver device, while the DS25BR100 fea-
tures both pre-emphasis and equalization for use as an opti-
mized repeater device. The DS25BR150 is a buffer/repeater
with the lowest power consumption and does not feature
transmit pre-emphasis nor receive equalization.
Wide input common mode range allows the receiver to accept
signals with LVDS, CML and LVPECL levels; the output levels
are LVDS. A very small package footprint requires minimal
space on the board while the flow-through pinout allows easy
board layout. The differential inputs and outputs are internally
terminated with a 100Ω resistor to lower device input and out-
put return losses, reduce component count and further mini-
mize board space.
Typical Application
300054
Features
Applications
DC - 3.125 Gbps low jitter, high noise immunity, low power
operation
Four levels of transmit pre-emphasis drive lossy
backplanes and cables
On-chip 100Ω input and output termination minimizes
insertion and return losses, reduces component count and
minimizes board space
7 kV ESD on LVDS I/O pins protects adjoining
components
Small 3 mm x 3 mm 8-LLP space saving package
Clock and data buffering
Metallic cable driving
FR-4 driving
30005410
November 6, 2007
www.national.com

Related parts for DS25BR120TSD/NOPB

DS25BR120TSD/NOPB Summary of contents

Page 1

... Typical Application © 2007 National Semiconductor Corporation Features ■ 3.125 Gbps low jitter, high noise immunity, low power operation ■ ...

Page 2

Block Diagram Pin Diagram Pin Descriptions Pin Name Pin Name PE1 1 IN+ 2 IN- 3 PE0 OUT- 6 OUT+ 7 VCC 8 GND DAP Pre-Emphasis Truth Table PE1 Ordering Codes and Configurations ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ( LVCMOS Input Voltage (PE0, PE1) LVDS Input Voltage (IN+, IN−) LVDS Differential Input Voltage ((IN+) - (IN−)) LVDS Output Voltage (OUT+, OUT−) LVDS Differential Output Voltage ((OUT+) - (OUT− ...

Page 4

Symbol Parameter LVDS INPUT DC SPECIFICATIONS (IN+, IN-) V Input Differential Voltage ID V Differential Input High Threshold TH V Differential Input Low Threshold TL V Common Mode Voltage Range CMR I Input Current IN C Input Capacitance IN R ...

Page 5

AC Electrical Characteristics Over recommended operating supply and temperature ranges unless otherwise specified. (Notes 9, 10) Symbol Parameter LVDS OUTPUT AC SPECIFICATIONS (OUT+, OUT-) t Differential Propagation Delay High to Low PHLD t Differential Propagation Delay Low to High PLHD ...

Page 6

Symbol Parameter JITTER PERFORMANCE WITH PE = LOW (Figures 5 and 6) t RJ1B Random Jitter (RMS Value) t RJ2B Test Channel A (Note 14) t DJ1B Deterministic Jitter (Peak to Peak) t DJ2B Test Channel A (Note 15) t ...

Page 7

DC Test Circuits AC Test Circuits and Timing Diagrams FIGURE 1. Differential Driver DC Test Circuit FIGURE 2. Differential Driver AC Test Circuit FIGURE 3. Propagation Delay Timing Diagram FIGURE 4. LVDS Output Transition Times 7 30005420 30005421 30005422 30005423 ...

Page 8

Pre-Emphasis Test Circuits Test Channel Loss Characteristics The test channel was fabricated with Polyclad PCL-FR-370-Laminate/PCL-FRP-370 Prepreg materials (Dielectric constant of 3.7 and Loss Tangent of 0.02). The edge coupled differential striplines have the following geometries: Trace Width ( ...

Page 9

Device Operation INPUT INTERFACING The DS25BR120 accepts differential signals and allows simple coupling. With a wide common mode range, the DS25BR120 can be DC-coupled with all common differential drivers (i.e. LVPECL, LVDS, CML). The following three figures ...

Page 10

OUTPUT INTERFACING The DS25BR120 outputs signals compliant to the LVDS standard. It can be DC-coupled to most common differential receivers. The following figure illustrates typical DC-coupled interface to common differential receivers and assumes that the receivers have high impedance inputs. ...

Page 11

Typical Performance Maximum Data Rate as a Function of CAT5e (Belden 1700A) Length Maximum Data Rate as a Function of CAT5e (Belden 1700A) Length DS25BR120 Used as a Driver DS25BR110 Used as a Receiver Power Supply Current as a Function ...

Page 12

A 2.5 Gbps NRZ PRBS-7 After 40" Differential FR-4 Stripline V:125 mV / DIV, H: DIV A 3.125 Gbps NRZ PRBS-7 After 40" Differential FR-4 Stripline V:125 mV / DIV, H: DIV www.national.com 30005430 An Equalized ...

Page 13

Physical Dimensions inches (millimeters) unless otherwise noted (See AN-1187 for PCB Design and Assembly Recommendations) Order Number DS25BR120TSD NS Package Number SDA08A 13 www.national.com ...

Page 14

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...

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