MAX3982UTE+ Maxim Integrated Products, MAX3982UTE+ Datasheet - Page 11

• Manufacturer Part Number: MAX3982UTE+
• Description: IC DRIVER SFP CABLE 16-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Driverr

Specifications of MAX3982UTE+

• Number Of Drivers/receivers: 1/0
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 16-TQFN Exposed Pad
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Protocol: -
• Lead Free Status / Rohs Status: Details

Figure 4. Functional Diagram
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.
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, 100
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 1200mV
PC Board Receiver and Cable Driver
P-P
TX_DISABLE
. When OUTLEV is high, the amplitude is
LOSLEV
OUTLEV
V
______________________________________________________________________________________
PE0
PE1
CC1
IN+
IN-
Detailed Description
SFP Copper-Cable Preemphasis Driver
2
V
V
V
CC1
CC2
CC2
V
CC2
40k
10k
40k
10k
LVTTL
V
CC2
LVTTL
LVTTL
LVTTL
CML
MAX3982
balanced
V
V
V
CC1
CC2
CC2
EQUALIZER
FIXED
GND
2
1600mV
dent of up to 0.20UI
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 180mV
LVTTL low, the LOS assert threshold is 85mV
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).
LIMITER
P-P
. Residual jitter of the MAX3982 is indepen-
SIGNAL DETECT
PREEMPHASIS
P-P
Loss-of-Signal (LOS) Output
source jitter.
CML
P-P
. When LOSLEV is
V
OUT+
OUT-
LOS
CC2
TX Disable
P-P
.
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