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PDF DS25BR120 Data sheet ( Hoja de datos )
| Número de pieza | DS25BR120 | |
| Descripción | 3.125 Gbps LVDS Buffer | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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April 2007
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.
Features
■ 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
Applications
■ Clock and data buffering
■ Metallic cable driving
■ FR-4 driving
Typical Application
© 2007 National Semiconductor Corporation 300054
30005410
www.national.com
1 page  
AC Electrical Characteristics (Note 11)
Over recommended operating supply and temperature ranges unless otherwise specified. (Notes 9, 10)
Symbol
Parameter
Conditions
Min Typ Max Units
LVDS OUTPUT AC SPECIFICATIONS (OUT+, OUT-)
tPHLD Differential Propagation Delay High to Low
tPLHD Differential Propagation Delay Low to High
tSKD1 Pulse Skew |tPLHD − tPHLD| (Note 12)
tSKD2 Part to Part Skew (Note 13)
tLHT Rise Time
tHLT Fall Time
JITTER PERFORMANCE WITH PE = OFF
RL = 100Ω
RL = 100Ω
350 465
350 465
45 100
45 150
80 150
80 150
ps
ps
ps
ps
ps
ps
tRJ1A
tRJ2A
Random Jitter (RMS Value)
No Test Channels
(Note 14)
VID = 350 mV
VCM = 1.2V
Clock (RZ)
PE0 = 0, PE1 = 0
2.5 Gbps
3.125 Gbps
0.5 1
0.5 1
ps
ps
tDJ1A
tDJ2A
Deterministic Jitter (Peak to Peak)
No Test Channels
(Note 15)
VID = 350 mV
VCM = 1.2V
K28.5 (NRZ)
PE0 = 0, PE1 = 0
2.5 Gbps
3.125 Gbps
9 31 ps
16 40 ps
tTJ1A
tTJ2A
Total Jitter (Peak to Peak)
No Test Channels
(Note 16)
VID = 350 mV
VCM = 1.2V
PRBS-23 (NRZ)
PE0 = 0, PE1 = 0
2.5 Gbps
3.125 Gbps
0.05 0.13 UIP-P
0.09 0.16 UIP-P
5 www.national.com
5 Page 
Typical Performance
30005434
Maximum Data Rate as a Function of CAT5e
(Belden 1700A) Length
30005435
Maximum Data Rate as a Function of CAT7
(Siemon Tera) Length
30005436
Maximum Data Rate as a Function of CAT5e
(Belden 1700A) Length
DS25BR120 Used as a Driver
DS25BR110 Used as a Receiver
30005437
Maximum Data Rate as a Function of CAT5e
(Belden 1700A) Length
DS25BR120 Used as a Driver
DS25BR110 Used as a Receiver
30005438
Power Supply Current as a Function of Frequency
11
www.national.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet DS25BR120.PDF ] | |
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