DS25BR110TSDX National Semiconductor, DS25BR110TSDX Datasheet

DS25BR110TSDX

Manufacturer Part Number
DS25BR110TSDX
Description
Manufacturer
National Semiconductor
Datasheet

Specifications of DS25BR110TSDX

Number Of Elements
1
Input Type
CMOS
Operating Supply Voltage (typ)
3.3V
Differential Input High Threshold Voltage
100mV
Diff. Input Low Threshold Volt
-100mV
Output Type
Repeater
Differential Output Voltage
450mV
Transmission Data Rate
390.625MBps
Propagation Delay Time
0.465ns
Power Dissipation
2.08W
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Number Of Receivers
1
Number Of Drivers
1
Lead Free Status / RoHS Status
Not Compliant
© 2007 National Semiconductor Corporation
DS25BR110
3.125 Gbps LVDS Buffer with Receive Equalization
General Description
The DS25BR110 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. A fully differential signal path ensures exceptional signal
integrity and noise immunity.
The DS25BR110 features four levels of receive equalization
(EQ), making it ideal for use as a receiver device. Other LVDS
devices with similar IO characteristics include the following
products. The DS25BR120 features four levels of pre-em-
phasis for use as an optimized driver device, while the
DS25BR100 features both pre-emphasis and equalization for
use as an optimized 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 min-
imize board space.
Typical Application
300053
Features
Applications
DC - 3.125 Gbps low jitter, high noise immunity, low power
operation
Four levels of receive equalization reduce ISI jitter
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 equalization
FR-4 equalization
30005310
November 6, 2007
www.national.com

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DS25BR110TSDX 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 EQ0 1 IN+ 2 IN- 3 EQ1 OUT- 6 OUT+ 7 VCC 8 GND DAP Control Pins (EQ0 and EQ1) Truth Tables EQ1 ...

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 (EQ0, EQ1) 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 EQ = LOW (Figures 5 and RJ1B Random Jitter (RMS Value) t RJ2B Test Channel D (Note 14) t DJ1B Deterministic Jitter (Peak to Peak) t DJ2B Test Channel D (Note 15) ...

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 30005320 30005321 30005322 30005323 ...

Page 8

Equalization 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 DS25BR110 accepts differential signals and allows simple coupling. With a wide common mode range, the DS25BR110 can be DC-coupled with all common differential drivers (i.e. LVPECL, LVDS, CML). The following three figures ...

Page 10

OUTPUT INTERFACING The DS25BR110 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 CAT7 (Siemon Tera) Length Maximum Data Rate as a Function of CAT5e (Belden 1700A) Length DS25BR120 Used as a Driver ...

Page 12

A 2.5 Gbps NRZ PRBS-7 After 70" Differential FR-4 Stripline V:100 mV / DIV, H: DIV A 3.125 Gbps NRZ PRBS-7 After 70" Differential FR-4 Stripline V:100 mV / DIV, H: DIV Total Jitter as a ...

Page 13

Total Jitter as a Function of Data Rate Total Jitter as a Function of Input Amplitude Total Jitter as a Function of Input Amplitude 30005343 Total Jitter as a Function of Data Rate Total Jitter as a Function of Input ...

Page 14

Physical Dimensions (See AN-1187 for PCB Design and Assembly Recommendations) www.national.com inches (millimeters) unless otherwise noted Order Number DS25BR110TSD NS Package Number SDA08A 14 ...

Page 15

Notes 15 www.national.com ...

Page 16

... 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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