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Part: ML6672
Category:
Communication
-> Network
-> ATM (Asynchronous Transfer Mode)
Description: Atm Utp Transceiver
Company: Micro Linear
Datasheet: Download ML6672 datasheet File size : 123 kB
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Datasheet text preview:
December 1998
ML6672* ATM UTP Transceiver
GENERAL DESCRIPTION
The ML6672 is a complete monolithic transceiver for 155Mbps NRZ encoded data transmission over Category 5 Unshielded Twisted Pair and Shielded Twisted Pair cables. The ML6672 is compliant with the ATM Forum 155Mbps Twisted Pair Specification. The adaptive equalizer in the ML6672 will accurately compensate for line losses of up to 100m of UTP. The part requires only external 1% resistors for accurate equalization. The ML6672 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 ML6672 transmit section accepts ECL 100K compatible NRZ inputs. Several additional functions are provided by the ML6672 to simplify applications. A common-mode reference is provided to set the input DC level for the equalizer and the near-end transformer winding. This terminal may be used as an AC ground for the transformer center-tap or termination resistors. A link status circuit monitors line integrity and provides a proper logic level output signal to interface with the host system. The ML6672 is implemented in a BiCMOS process. A differential signal path throughout minimizes the effects of power supply transients and noise.
FEATURES
s s s s s
Complies with ATM Forum 155Mbps Twisted Pair Specification Transmitter can be externally turned off for true quiet line Receiver includes adaptive equalizer Operates over 100 meters of STP or category 5 UTP Twisted Pair Cable Semi-standard options available
* This Part Is End Of Life As Of August 1, 2000
BLOCK DIAGRAM
TXIN+
Designs 74 for New See ML66 Please
LPBK TXOFF TVCCA TVCCD RTSET RTSET1 RTSET2 TPOUT+ TPOUT SD+ SD LINK STATUS ADAPTIVE CONTROL CAP1 CAP2
TXIN
RXOUT+ MUX RXOUT ADAPTIVE EQUALIZER ADAPTIVE CONTROL REFERENCE TPIN+ TPIN
RSET1 TGNDA TGNDD
RSET2 RTH1 GND RTH2
RRSET1 RRSET
RRSET2 RVCCA RVCCD CMREF
1
ML6672
PIN CONFIGURATION
ML6672 32-Pin PLCC (Q32)
RXOUT RVCCA CMREF TPIN+ RRSET2 TPIN CAP1 CAP2
ML6672 32-Pin TQFP (H32-7)
TGNDA
25 24 TPOUT 23 TPOUT+ 22 RTSET2 21 RTSET1 20 TVCCD 19 TXIN 18 TXIN+ 17 N/C 9 10 11 12 13 14 15 16
4 RXOUT+ 5 RVCCD 6 SD 7 SD+ 8 N/C 9 TGNDD 10 LPBK 11 TXOFF 12 N/C 13
3
2
1
32 31 30 29 RRSET1 28 RRSET2 27 RSET1 26 RSET2 25 RGND 24 RTH1 23 RTH2 22 TVCCA 21 TGNDA RRSET1 1 TPIN 2 TPIN+ 3 CMREF 4 CAP2 5 CAP1 6 RVCCA 7 RXOUT 8
32
31
30
29
28
27
RXOUT+
RVCCD
N/C
TGNDD
LPBK
SD
SD+
TVCCD
TXIN+
TXIN
TPOUT+
RTSET1
RTSET2
PIN DESCRIPTION
NAME FUNCTION NAME FUNCTION
TXIN+, TXIN TPOUT+, TPOUT
LPBK
TXOFF RTSET1, RTSET2
TVCCA, TVCCD
TGNDA, TGNDD SD+, SD
TPIN+, TPIN
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 buffer to a quiet state when asserted low. 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. 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. NRZ encoded data from the receiver filter/ transformer module enters the Receiver through these pins.
TPOUT
RXOUT+, RXOUT CAP1, CAP2
RRSET1, RRSET2
CMREF RVCCA, RVCCD
RGND RSET1, RSET2 RTH1, RTH2
Differential ECL100K compatible outputs provide NRZ encoded data to the PHY. Two external capacitors connected to these pins sets the time constant for the adaptation in the equalizer loop as well as for signal detect response. 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. An external 5kW resistor across these pins sets up an internal reference current. An external resistor connected across these pins sets the internal levels for equalization as well as signal detect. This resistor allows compensation for transmit and magnetics variations. RTH should be set to match the peak-to-peak transmit amplitude. VAMP = 16 x 1.25 x RTH/RSET where VAMP is the peak-to-peak amplitude of the transmit output with zero length cable.
2
TXOFF
14 15 16 17 18 19 20
TVCCA
26
RGND
RSET1
RSET2
RTH1
RTH2
ML6672
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 + 0.3 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°CW
OPERATING CONDITIONS
VCC Supply Voltage ......... 5V ± 5% TA, Ambient Temperature ..... 0°C to +70°C RTSET .... 4KW ± 1% RRSET ........ 9.53KW ± 1% RSET ...... 5KW ± 1% RTH ..... 250W ± 1% CAP1, CAP2 ........ 1.0µF + 5% Receive transformer insertion loss .... < 0.5dB
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, TA = TMIN to TMAX, VCC = 5V ±5%, RTSET = 4.0Ký, RTH = 250ý.
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) Note 5 Note 5 VCC1.025 VCC1.81 VCC0.88 VCC1.62 V V VCC1.165 VCC1.810 0.5 50 10 +10 VCC0.88 VCC1.475 2.2 VCC 1.5 V V 2.0 0.8 V V 67 52 25 6 170 mA mA mA mA mA CONDITIONS MIN TYP MAX UNITS
kW
uA V V uA uA
3
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