MAX3984 Ver la hoja de datos (PDF) - Maxim Integrated
Número de pieza
componentes Descripción
Lista de partido
MAX3984 Datasheet PDF : 18 Pages
| |||
1Gbps to 10Gbps Preemphasis Driver with
Receive Equalizer
Pin Description
PIN
1
2
3
4, 8, 9, 16
5
6
7
10
11
12
13
14
NAME
VCC1
IN+
IN-
GND
FUNCTION
Power-Supply Connection for Inputs. Connect to +3.3V.
Positive Data Input, CML. This input is internally terminated with 50.
Negative Data Input, CML. This input is internally terminated with 50.
Circuit Ground
OUT_LEV
Output-Swing Control Input, LVTTL with 20k Internal Pullup. Set to TTL high or open for maximum
output swing, or set to TTL low for reduced swing.
PE1
Output Preemphasis Control Input, LVTTL with 10k Internal Pullup. This pin is the most significant
bit of the 2-bit preemphasis control. Set high or open to assert this pin.
PE0
Output Preemphasis Control Input, LVTTL with 10k Internal Pullup. This pin is the least significant
bit of the 2-bit preemphasis control. Set high or open to assert this pin.
OUT-
OUT+
VCC2
Negative Data Output, CML. This output is terminated with 50 to VCC2.
Positive Data Output, CML. This output is terminated with 50 to VCC2.
Power-Supply Connection for Output. Connect to +3.3V.
TX_DISABLE
Transmitter Disable Input, LVTTL with 10k Internal Pullup. When high or open, differential output is
less than 10mVP-P. Set low for normal operation.
Loss-of-Signal Detect, Open-Collector TTL Output. Requires an external pullup 4.7k (+5.5V
LOS
maximum). This output sinks current when the input signal is above the LOS deassert level. To
disable squelch pull LOS to ground.
Receive Equalization Control Input, LVTTL 40k Internal Pullup. Set to TTL high or open for higher
15
IN_LEV LOS assert/deassert levels and 10in FR-4 compensation. Set to TTL low for lower LOS assert/deassert
levels and to bypass the FR-4 equalization.
—
EP
Exposed Pad. For optimal thermal conductivity, this pad must be soldered to the circuit board
ground.
Detailed Description
The MAX3984 is composed of a receiver, a driver, and
an LOS detector with selectable threshold. Equalization
is provided in the receiver. Selectable preemphasis
and selectable output amplitude are included in the
transmitter. The MAX3984 also includes transmit dis-
able control for the output.
Receiver
Data is fed into the MAX3984 through a CML input stage
and a selectable equalization stage. The fixed equalizer
in the receiver corrects for up to 10in of PCB loss on
FR-4 material at 10Gbps. The fixed equalizer can be
bypassed by setting the IN_LEV pin to a logic-low.
Driver
The driver includes four-state preemphasis to compen-
sate for up to 10m of 24 AWG, 100Ω balanced cable,
or 30in of FR-4. The OUT_LEV pin selects the output
amplitude. When OUT_LEV is low, the peak-to-peak
amplitude is 1000mVP-P. When OUT_LEV is high, the
peak-to-peak amplitude is 1200mVP-P.
Loss of Signal (LOS)
Input LOS detection is provided. This is an open-collec-
tor output and requires an external pullup resistor
(≥ 4.7kΩ). The pullup resistors should be connected
from LOS to a supply in the +3.0V to +5.5V range. The
LOS output is not valid until power-up is complete.
10 ______________________________________________________________________________________
Share Link: 