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Part: ML6673
Category:
Communication
-> Network
-> Ethernet/DS1/E1 (T1/E1)
Description: Fast Ethernet/fddi Tp-pmd Transceiver
Company: Micro Linear
Datasheet: Download ML6673 datasheet File size : 123 kB
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Datasheet text preview:
December 1998
ML6673 Fast Ethernet/FDDI TP-PMD Transceiver
GENERAL DESCRIPTION
The ML6673 is a complete monolithic transceiver for 125 Mbaud MLT-3 encoded data transmission over Category 5 unshielded twisted pair and shielded twisted pair cables. The ML6673 integrates the baseline restoration function defined in the TP-PMD standard. The adaptive equalizer in the ML6673 will accurately compensate for line losses exceeding the IEEE 802.3u limit of 100m of UTP. The ML6673 receive section consists of an equalizing filter with a feedback loop for controlling effective line compensation. The feedback loop contains a filter and detection block for determining the proper control signal. The ML6673 also contains data comparators with precisely controlled slicing thresholds and an MLT-3 to NRZI translator. The ML6673 transmit section accepts ECL 100K compatible NRZ inputs and converts them to differential current mode MLT-3 signals. Transmit amplitude is controlled by a single external resistor.
FEATURES
s s
Compliant with IEEE 802.3u Fast Ethernet (100BASE-TX) standard
Compliant with ANSI X3T12 FDDI over copper (TP-PMD) standard s Integrated baseline wander correction circuit s Transmitter converts NRZI ECL signals to MLT-3 current driven outputs s Transmitter can be externally turned off (high impedence) for true quiet line Receiver includes adaptive equalizer and MLT-3 to NRZI decoder s Operates over 100 meters of STP or category 5 UTP Twisted Pair Cable set by the IEEE 802.3u standards s 32-pin PLCC and TQFP
s
BLOCK DIAGRAM
LPBK
TXOFF
TVCCA
TVCCD RTSET1
RTSET RTSET2
TXIN+ TXIN NRZI TO MLT-3
TPOUT+ TPOUT BASELINE WANDER CORRECTION
SD+ SD
LINK STATUS ADAPTIVE CONTROL
RXOUT+ MUX RXOUT MLT-3 TO NRZI ADAPTIVE EQUALIZER TPIN+ TPIN
RRSET1 TGNDA TGNDD GND RRSET
RRSET2 RVCCA RVCCD CMREF
1
ML6673
PIN CONFIGURATION
ML6673 32-Pin PCC (Q32)
RXOUT RVCCA CMREF TPIN+ RRSET2 TPIN N/C N/C
ML6673 32-Pin TQFP (H32-7)
TGNDA TVCCA RGND
N/C
N/C
N/C
4 RXOUT+ RVCCD SD SD+ N/C TGNDD LPBK TXOFF N/C 5 6 7 8 9 10 11 12 13
3
2
1
32 31 30 29 28 27 26 25 24 23 22 21 RRSET1 RRSET2 N/C N/C RGND N/C N/C TVCCA TGNDA RRSET1 TPIN TPIN+ CMREF N/C N/C RVCCA RXOUT 1 2 3 4 5 6 7 8
32
31
30
29
28
27
N/C
26
25 24 23 22 21 20 19 18 TPOUT TPOUT+ RTSET2 RTSET1 TVCCD TXIN TXIN+ N/C
9
RXOUT+
10
RVCCD
11
SD
12
SD+
13
N/C
14
TGNDD
15
LPBK
16
TXOFF
17
14 15 16 17 18 19 20
TVCCD TXIN+ TXIN RTSET1 RTSET2 TPOUT+ TPOUT
PIN DESCRIPTION
NAME FUNCTION NAME FUNCTION
TXIN+, TXIN
TPOUT+, TPOUT LPBK
TXOFF
RTSET1, RTSET2
TVCCA, TVCCD
These differential ECL100K compatible inputs receive NRZI data from the PHY for transmission. Outputs from the NRZI-MLT3 state machine drive these differential current outputs. The transmitter filter/transformer module connects the media to these pins. This TTL input enables transmitterreceiver loopback internally when asserted low. When LPBK is asserted, signal detect is asserted. This TTL input forces the NRZI-MLT3 state machine to a high impedence state when asserted low and shuts off transmit bias current. An external 1% resistor connected between these pins controls the transmitter output current amplitude. IOUT = 64 x 1.25V/RTSET Separate analog and digital transmitter power supply pins help to isolate sensitive circuitry from noise generating digital functions. Both supplies are nominally +5 volts.
TGNDA, TGNDD SD+, SD
TPIN+, TPIN
RXOUT+, RXOUT RRSET1, RRSET2
CMREF RVCCA, RVCCD
RGND
Analog and digital transmitter grounds provide separate return paths for clean and noisy signals. These differential ECL100K compatible outputs indicate the presence of a data signal with an amplitude exceeding a preset threshold. MLT-3 encoded data from the receiver filter/transformer module enters the receiver through these pins. Differential ECL100K compatible outputs provide NRZI encoded data to the PHY. Internal time constants controlling the equalizer 's transfer function are set by an external resistor connected across these pins. This pin provides a DC common mode reference point for the receiver inputs. Analog and digital supply pins are separated to isolate clean and noisy circuit functions. Both supplies are nominally +5 volts. Receiver ground.
2
ML6673
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. VCC Supply Voltage Range .......... GND 0.3V to 6V Input Voltage Range Digital Inputs ...... GND 0.3V to VCC +0.3V Output Current TPOUT± , SD±, RXOUT± .. 50mA All other outputs ....... 10mA Junction Temperature ............ 150°C Storage Temperature ........ 65°C to 150°C Lead Temperature (Soldering, 10 sec) ............ 260°C Thermal Resistance (JA) PLCC ...... 60°C/W TQFP ...... 80°C/W
OPERATING CONDITIONS
VCC Supply Voltage ........... 5V ± 5% TA, Ambient Temperature ...... 0°C to 70°C RTSET ...... 2k ±1% RRSET .......... 9.53k ±1% Receive Transformer Insertion Loss ............ < 0.5dB
ELECTRICAL CHARACTERISTICS
PARAMETER DC Characteristics Supply Current RVCCD RVCCA TVCCD TVCCA RVCCD + RVCCA + TVCCD + TVCCA TTL Inputs (TXOFF, LPBK) VIL Input Low Voltage VIH Input High Voltage Differential Inputs (TPIN±, TXIN±) TPIN+, TPIN Common Mode Input Voltage TPIN+, TPIN Differential Input Voltage TPIN+, TPIN Differential Input Resistance TPIN+, TPIN Common Mode Input Current TXIN+, TXIN Input Voltage HIGH (VIH) TXIN+, TXIN Input Voltage LOW (VIL) TXIN+, TXIN Input Current LOW (IIL) TXIN+, TXIN Input Current HIGH (IIH) Differential Outputs (SD±, RXOUT±, TPOUT±) SD+, SD, RXOUT+, RXOUT Output Voltage HIGH (VOH) SD+, SD, RXOUT+, RXOUT Output Voltage LOW (VOL)
Unless otherwise specified, TA = TMIN to TMAX, VCC = 5V ±5%, RTSET = 2k. (Note 1)
CONDITIONS MIN TYP MAX UNITS
74 65 24 6 195
mA mA mA mA mA
0.8 2.0
V V
2.2
VCC 1.5
V V
10.0K +10 VCC1.165 VCC1.810 0.5 50 VCC0.88 VCC1.475
µA V V µA µA
Note 3 Note 3
VCC1.025 VCC1.81
VCC0.88 VCC1.62
V V
3
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