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Part: ML6674CQ
Category:
Description: Atm 155Mbps Utp Transceiver
Company: Micro Linear
Datasheet: Download ML6674CQ datasheet File size : 123 kB
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July 1999
ML6674 ATM 155Mbps UTP Transceiver
GENERAL DESCRIPTION
The ML6674 is a complete monolithic transceiver for 155Mbps NRZ encoded data transmission over category 5 unshielded twisted pair (UTP) and shielded twisted pair (STP) cables. The ML6674 is compliant with the ATM 155Mbps Twisted Pair Specification. The ML6674 includes the baseline restoration function and adaptive equalization which will accurately compensate for line losses exceeding 100m of UTP. The ML6674 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. An ECL 100K compatible buffer at the output interfaces directly with ATM physical interface chips. The ML6674 transmit section accepts ECL 100K compatible NRZ inputs.
F E AT U R E S
s
Complies with ATM Forum 155Mbps twisted pair specification Integrated baseline wander correction circuit Integrated adaptive equalization Transmitter can be externally turned off (high impedence) for true quiet line Operates over 100 meters of STP or category 5 UTP Twisted Pair Cable 32-pin PLCC and TQFP
s s s
s
s
BLOCK DIAGRAM
LPBK
TXOFF
TVCCA
TVCCD RTSET1
RTSET RTSET2
TXIN+ TXIN
TPOUT+ TPOUT
SD+ SD
LINK STATUS ADAPTIVE CONTROL
RXOUT+ MUX RXOUT ADAPTIVE EQUALIZER ADAPTIVE CONTROL REFERENCE TPIN+ TPIN
RRSET1 TGNDA TGNDD RGND RRSET
RRSET2 RVCCA RVCCD CMREF
1
ML6674
PIN CONFIGURATION
ML6674 32-Pin PCC (Q32)
RXOUT RVCCA CMREF TPIN+ RRSET2 TPIN N/C N/C
ML6674 32-Pin TQFP (H32-7)
TGNDA
25 24 23 22 21 20 19 18 9 10 11 12 13 14 15 16 17 TPOUT TPOUT+ RTSET2 RTSET1 TVCCD TXIN TXIN+ 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
RVCCD
SD
N/C
TGNDD
LPBK
RXOUT+
TXIN+
TXIN
TVCCD
RTSET1
RTSET2
TPOUT+
PIN DESCRIPTION
NAME FUNCTION NAME FUNCTION
TXIN+, TXIN
These differential ECL100K compatible inputs receive NRZ data from the PHY for transmission. Outputs from the NRZ buffer 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. This TTL input forces the NRZ driver to a high impedence state when asserted low and shuts off transmit bias currrent. An external 1% resistor connected between these pins controls the transmitter output current amplitude. IOUT = 32 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. Analog and digital transmitter grounds provide separate return paths for clean and noisy signals.
TPOUT
SD+, SD
TPOUT+, TPOUT
These differential ECL100K compatible outputs indicate the presence of a data signal with an amplitude exceeding a preset threshold. NRZ encoded data from the receiver filter/transformer module enters the Receiver through these pins. Differential ECL100K compatible outputs provide NRZ 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.
TPIN+, TPIN
LPBK
TXOFF
RXOUT+, RXOUT RRSET1, RRSET2
RTSET1, RTSET2
CMREF
TVCCA, TVCCD
RVCCA, RVCCD
TGNDA, TGNDD
RGND
2
TXOFF
SD+
14 15 16 17 18 19 20
TVCCA
26
RGND
N/C
N/C
N/C
N/C
ML6674
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are limits beyond which the life of the integrated circuit may be impaired. All voltages unless otherwise specified are measured with respect to ground. VCC Supply Voltage Range ......... GND 0.3V to 6V Input Voltage Range Digital Inputs ............ GND 0.3V to VCC + 0.3V Output Current TPOUT+/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 (qJA) PLCC ...... 60°C/W TQFP ...... 80°C/W
OPERATING CONDITIONS
VCC Supply Voltage ......... 5V ± 5% TA, Ambient Temperature ....... 0°C to 70°C RTSET .... 2kW ± 1% RRSET ........ 9.53kW ± 1% Receive transformer insertion loss ............ < 0.5dB
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, TA = TMIN to TMAX, VCC = 5V ±5%, RTSET = 2.0ký. (Note 1)
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 (I IL) 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) TPOUT+, TPOUT Differential Output Current HIGH Note 3 Note 3 VOUT = VCC ± 0.5, Note 2 VCC1.025 VCC1.81 19.0 VCC0.88 VCC1.62 21.0 V V mA VCC1.165 VCC1.810 0.5 50 10 +10 VCC0.88 VCC1.475 2.2 VCC 1.5 V V kW µA V V µA µA 2.0 0.8 V V 74 65 14 6 185 mA mA mA mA mA CONDITIONS MIN TYP MAX UNITS
3
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