|
|
PDF MAX3982 Data sheet ( Hoja de datos )
| Número de pieza | MAX3982 | |
| Descripción | SFP Copper-Cable Preemphasis Driver | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX3982 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
19-3354; Rev 0; 8/04
SFP Copper-Cable Preemphasis Driver
General Description
The MAX3982 is a single-channel, copper-cable preem-
phasis driver that operates from 1Gbps to 4.25Gbps. It
provides compensation for copper links, such as
4.25Gbps Fibre Channel, allowing spans of up to 15m
with 24AWG. The cable driver provides four selectable
preemphasis levels. The input compensates for up to
10in of FR4 circuit board material at 4.25Gbps.
The MAX3982 also features SFP-compliant loss-of-signal
detection with selectable sensitivity and TX_DISABLE.
Selectable output swing reduces EMI and power con-
sumption. It is packaged in a 3mm x 3mm, 16-pin thin
QFN and operates from 0°C to +85°C temperature range.
Applications
SFP Active Copper-Cable Assemblies
Backplanes
1.0625Gbps, 2.125Gbps, and 4.25Gbps Fibre
Channel
1.25Gbps Ethernet
2.488Gbps STM16
InfiniBand
PCI Express
Features
♦ Drives Up to 15m with 24AWG Cable
♦ Drives Up to 30in of FR4
♦ 0.25W Total Power with +3.3V Supply
♦ Selectable 1600mVP-P or 1200mVP-P Differential
Output Swing
♦ Selectable Output Preemphasis
♦ Fixed Input Equalization
♦ Loss-of-Signal Detection with Selectable
Sensitivity
♦ Transmit Disable
Ordering Information
PART
MAX3982UTE
TEMP
RANGE
0°C to +85°C
PIN-
PACKAGE
16 Thin QFN
PKG
CODE
T1633-4
Pin Configuration appears at end of data sheet.
Typical Application Circuit
DISK
ENCLOSURE
SWITCH OR
SERDES
TX+
TX-
+3.3V
VCC OR
GND
TX_DISABLE VCC
PE0
PE1
LOSLEV MAX3982
0.01µF
OUTLEV
IN+
0.01µF
IN- GND
LOS
OUT+
OUT-
SFP ACTIVE CABLE ASSEMBLY
+3.3V
≤ 15m (24AWG)
UP TO 4.25Gbps
COPPER-CABLE
DIFFERENTIAL 100Ω TWIN-AX
VCC
LOS
0.01µF
4.25Gbps LIMITING
AMPLIFIER
IN+
0.01µF
OUT+
IN- GND OUT-
0.01µF
0.01µF
FABRIC SWITCH
≤ 5V
≥ 4.7kΩ
SWITCH OR
SERDES
RX+
RX-
RX+
RX-
≤ 5V
≥4.7kΩ
0.01µF
OUT+
0.01µF
+3.3V
VCC
0.01µF
IN+
0.01µF
OUT- IN-
4.25Gbps LIMITING
AMPLIFIER
LOS GND
OUT+
OUT-
LOS
+3.3V
VCC IN+
IN-
MAX3982 PE0
PE1
LOSLEV
OUTLEV
TX_DISABLE
GND
0.01µF
0.01µF
VCC OR
GND
TX+
TX-
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
SFP Copper-Cable Preemphasis Driver
SIGNAL
SOURCE
A
TEST SETUP
PC BOARD (FR4)
MAX3982
6 mil IN
OUT 6 mil
B
24AWG 100Ω TWIN-AX
SMA CONNECTORS
OSCILLOSCOPE OR
ERROR DETECTOR
D
1in ≤ L ≤ 12in
L ≤ 1in
MAX3748
6 mil IN
OUT
FR4
4.0 ≤ εR ≤ 4.4
tan δ = 0.022
L = 2in
L ≤ 1in
39Ω
22pF
22pF
39Ω
SMA CONNECTORS
Figure 3. End-to-End Test Setup Using the MAX3748 as a Receiver. Deterministic jitter and eye diagrams measured at point D.
Typical Operating Characteristics
(VCC = +3.3V, TA = +25°C, unless otherwise noted. PRBS7 + 100CID pattern is PRBS 27, 100 zeros, 1010, PRBS 27, 100 ones, 0101.)
TRANSIENT RESPONSE
MAX3982 toc01
4.25Gbps K28.7 PATTERN
OUTLEV = HIGH
A
B
C
D
D
C
B
A
A = 2dB, PE = 00
B = 4dB, PE = 01
C = 8dB, PE = 10
D = 14dB, PE = 11
END-TO-END DETERMINISTIC JITTER
vs. CABLE LENGTH AT 4.25Gbps
1.0
4.25Gbps PRBS7 + 100CID PE[1,0] = 00
0.9
0.8 12in FR4 AT INPUT PE[1,0] = 01
0.7 USING MAX3748 AS
RECEIVER, AS SHOWN
0.6 IN FIGURE 3
0.5 PE[1,0] = 10
0.4 PE[1,0] = 11
0.3
0.2
0.1
0
0 5 10 15 20
CABLE LENGTH (m)
END-TO-END DETERMINISTIC JITTER
vs. CABLE LENGTH AT 2.125Gbps
1.0
2.125Gbps PRBS7 + 100CID
0.9
12in FR4 AT INPUT
0.8 USING MAX3748 AS RECEIVER,
0.7 AS SHOWN IN FIGURE 3
PE[1,0] = 00
0.6
0.5 PE[1,0] = 01
0.4 PE[1,0] = 10
0.3
PE[1,0] = 11
0.2
0.1
0
0 5 10 15 20
CABLE LENGTH (m)
_______________________________________________________________________________________ 5
5 Page 
SFP Copper-Cable Preemphasis Driver
VCC2
VCC2
10kΩ
PE0 2
PE1
LVTTL
MAX3982
2
VCC1
LIMITER
IN+ FIXED
CML EQUALIZER
IN-
LOSLEV
TX_DISABLE
OUTLEV
VCC1
40kΩ
VCC2
10kΩ
VCC2
40kΩ
LVTTL
VCC1
LVTTL
VCC2
LVTTL
VCC2
PREEMPHASIS CML
SIGNAL DETECT
VCC2
OUT+
OUT-
LOS
Figure 4. Functional Diagram
GND
Detailed Description
The MAX3982 comprises a PC board receiver, a cable
driver, and a loss-of-signal detector with adjustable
threshold (Figure 4). Equalization is provided in the
receiver. Selectable preemphasis and selectable output
amplitude are included in the transmitter. The MAX3982
also includes transmit disable control for the output.
PC Board Receiver and Cable Driver
Data is fed into the MAX3982 through a CML input
stage and fixed equalization stage. The fixed equalizer
in the receiver corrects for up to 10in of PC board loss
on FR4 material at 4.25Gbps.
The cable driver includes four-state preemphasis to
compensate for up to 15m of 24AWG, 100Ω balanced
cable. Table 1 is provided for easy translation between
preemphasis expressions. The OUTLEV pin selects the
output amplitude. When OUTLEV is low, the amplitude
is 1200mVP-P. When OUTLEV is high, the amplitude is
1600mVP-P. Residual jitter of the MAX3982 is indepen-
dent of up to 0.20UIP-P source jitter.
Loss-of-Signal (LOS) Output
Loss-of-signal detection is provided on the data input.
Pullup resistors should be connected from LOS to a
supply in the range of +3.0V to +5.5V. The LOS output
is not valid until power-up is complete. Typical LOS
response time is 100ns.
The LOS assert and deassert levels are set by the
LOSLEV pin. When LOSLEV is LVTTL high or open, the
LOS assert threshold is 180mVP-P. When LOSLEV is
LVTTL low, the LOS assert threshold is 85mVP-P.
TX Disable
Transmit disable is provided to turn off the output when
desired. The TX_DISABLE pin can be connected to
LOS to automatically squelch the output when the
incoming signal is below the threshold set by LOSLEV
(see the Autodetect section).
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX3982.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX398 | Precision / 8-Channel/Dual 4-Channel / Low-Voltage / CMOS Analog Multiplexers |  Maxim Integrated |
| MAX3980 | 3.125Gbps Xaui Quad Equalizer | Maxim Integrated Products |
| MAX3981 | XAUI Quad Cable Equalizer | Maxim Integrated Products |
| MAX3982 | SFP Copper-Cable Preemphasis Driver | Maxim Integrated Products |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |