ML4665 Datasheet, PDF (3/13 Pages) Micro Linear Corporation – Low Cost Single Chip 10BASE-FL Transceiver

PIN DESCRIPTION
PIN NAME
1
LBDIS
FUNCTION
Loopback disable. When this pin is
tied to V_CC, the AUI transmit pair
data is not looped back to the AUI
receive pair. The ML4665 will now
operate in the full duplex mode.
When tied to GND or left floating,
the AUI transmit pair data is looped
back to the AUI receive pair, except
during collision. The ML4665 will
now operate in the half duplex
mode.
2
COL+ Gated 10MHz oscillation used to
3
COL– indicate a collision or jabber.
Balanced differential line driver
outputs that meet AUI specifications.
4
Rx+
Manchester encoded receive data
5
Rx–
output to the local device. Balanced
differential line driver outputs that
meet AUI specifications.
6
V_CC
+5 volt power input.
7
Tx+
Balanced differential line receiver
8
Tx–
inputs that meet AUI specifications.
These inputs may be transformer or
capacitively coupled. The Tx input
pins are internally DC biased for AC
coupling.
9
RTSET Sets the current driven output of the
transmitter.
10 RRSET A 1% 61.9kΩ resistor tied from this
pin to V_CC sets the biasing currents
for internal nodes.
ML4665
PIN NAME
FUNCTION
11 LMON Link Monitor “Low Light” LED status
output. This pin is pulled low when
the voltage on the V_IN+, V_IN– inputs
exceed the minimum threshold and
there are transitions on V_IN+, V_IN–
indicating an idle signal or active
data. If either the voltage on the
V_IN+, V_IN– inputs fall below the
minimum threshold or transitions
cease on V_IN+, V_IN–, LMON will go
high. Active low LED driver, open
collector.
12 V_CCTx
+5 volt supply for fiber optic LED
driver.
13 TxOUT
Fiber optic LED driver output.
14 GND
Ground Reference.
15 C_TIMER A capacitor from this pin to V_CC
determines the Link Monitor
response time.
16
V_DC
17 AGND
An external capacitor on this pin
integrates an error signal which
nulls the offset of the input
amplifier. If the DC feedback loop
is not being used, this pin should
be connected to V_REF.
Analog Filtered Ground.
18
V_IN–
This input pin should be
capacitively coupled to the input
source or to filtered AV_CC. (The
input resistance is approximately
1.3kΩ.)
19
V_IN+
This input pin should be
capacitively coupled to the input
source or to filtered AV_CC. (The
input resistance is approximately
1.3kΩ.)
20
AV_CC
Analog Filtered +5 volts.
3