ml6652 Sirenza Microdevices, ml6652 Datasheet - Page 6

• Manufacturer Part Number: ml6652
• Description: 10/100mbps Ethernet Fiber And Copper Media Converter With Auto-negotiation
• Manufacturer: Sirenza Microdevices

6
Pin No. Signal Name
25
PIN DESCRIPTIONS (continued)
8
1/3 of VCC
2/3 of VCC
PECLQU
Voltage
PECLQU
DUPLEX
VCC
0
DUPLEX Voltage
VCC/2
FOINP/FOINN and
VCC
Quantizer and LED
Quantizer and LED
Quantizer and LED
0
PECL/LVPECL
IOUT/IOUT#
Interfaces at
Driver
Driver
Driver
I / O
I
I
January 2004
TRANSPARENT#
Description
The fiber interface is selected as shown in Table 3.
When using an LED driver and fiber optic receiver, this pin also defines the
maximum supported link distance.
When the 300m maximum link length is selected, the voltage thresholds for
Signal Detect are increased.
Note: The ML6652 fiber interface quantizer sensitivity can be adjusted via
Register 30 bits 5, 6 and 7 to accomodate various cable lengths and signal
intensity.
This input can have one of three levels: VCC, VCC/2 or 0 Volts. This input has
80kΩ resistors internally connected to both VCC and Ground, generating VCC/
2 at the input if left unconnected. Settings defined by the DUPLEX power up
preset pin can be over written by the management interface. At power up the
DUPLEX pin causes the following default values to be written to management
register 30.
Note: this pin is typically read a few microseconds after power-up, if it is tied
to supplies that do not track the ML6652 power improper results will occur.
Use VCCD (pin 19) as the pull up point, do not add decoupling capacitors to
this input pin (without thoroughly understanding your PCB layout dynamics the
safest course is to make short connections and do not add decoupling
capacitors to this input pin).
<30.11> Default
PECLQU
Default
<30.7>
0
1
0
0
1
0
1
10BASE/100BASE
Table 3.
Table 4.
Link Length
Fiber Optic
300m/300m
PCB Traces
2Km/300m
2Km/2Km
Final Datasheet
<30.10> Default
ADVERTFD#
1
0
0
SHORTFO
Default
<30.5>
0
0
0
1
Wavelength LONGWL
850/1300nm
<30.15> Default
1300nm
ADVERTHD#
850nm
NA
0
0
0
Default
<30.6>
DS6652-F-02
0
0
1
0
ML6652