MAX3982 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – SFP Copper-Cable Preemphasis Driver

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 1600mV_P-P or 1200mV_P-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+
+3.3V
VCC
0.01µF
IN+
0.01µF
TX+
OUT-
IN-
TX-
MAX3982 _PE0
LOS
PE1
VCC OR
LOSLEV
GND
OUTLEV
TX_DISABLE
GND
________________________________________________________________ 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.