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ML6674CQ

更新时间：2024-09-18 02:12:47

品牌：MICRO-LINEAR

描述：ATM 155Mbps UTP Transceiver

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概述
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ML6674CQ 概述

ATM 155Mbps UTP Transceiver ATM 155Mbps的双绞线收发器

ML6674CQ 数据手册

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July 1999

ML6674

ATM 155Mbps UTPTransceiver

FEATURES

GENERAL DESCRIPTION

■ Complies with ATM Forum 155Mbps twisted pair

The ML6674 is a complete monolithic transceiver for

155Mbps NRZ encoded data transmission over category

specification

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.

■ Integrated baseline wander correction circuit

■ Integrated adaptive equalization

■ Transmitter can be externally turned off

(high impedence) for true quiet line

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.

■ Operates over 100 meters of STP or category 5 UTP

Twisted Pair Cable

■ 32-pin PLCC and TQFP

The ML6674 transmit section accepts ECL 100K

compatible NRZ inputs.

BLOCK DIAGRAM

RTSET

LPBK

TXOFF

TVCCA

TVCCD

RTSET1

RTSET2

TXIN+

TXIN–

TPOUT+

TPOUT–

SD+

SD–

LINK

STATUS

ADAPTIVE

CONTROL

RXOUT+

RXOUT–

MUX

TPIN+

TPIN–

ADAPTIVE

EQUALIZER

ADAPTIVE

CONTROL REFERENCE

RRSET1

RRSET2

RRSET RVCCA RVCCD CMREF

TGNDA TGNDD

RGND

ML6674

PIN CONFIGURATION

ML6674

32-Pin PCC (Q32)

32-PinTQFP (H32-7)

32 31 30

32 31 30 29 28 27 26 25

RRSET1

TPIN–

TPIN+

CMREF

N/C

TPOUT–

TPOUT+

RTSET2

RTSET1

TVCCD

TXIN–

RXOUT+

RVCCD

SD–

RRSET1

RRSET2

N/C

SD+

N/C

RGND

N/C

TGNDD

LPBK

N/C

RVCCA

RXOUT–

TXIN+

N/C

TXOFF

N/C

TVCCA

TGNDA

10 11 12 13 14 15 16

14 15 16 17 18 19 20

PIN DESCRIPTION

NAME

FUNCTION

NAME

FUNCTION

TX +, TX –

These differential ECL100K compatible

inputs receive NRZ data from the PHY

for transmission.

SD+, SD–

These differential ECL100K

compatible outputs indicate the

presence of a data signal with an

amplitude exceeding a preset

threshold.

TPOUT+,

TPOUT–

Outputs from the NRZ buffer drive

these differential current outputs. The

transmitter filter/transformer module

connects the media to these pins.

TPIN+, TPIN–

NRZ encoded data from the

receiver filter/transformer module

enters the Receiver through these

pins.

LPBK

This TTL input enables transmitter-

Receiver loopback internally when

asserted low.

RXOUT+,

RXOUT–

Differential ECL100K compatible

outputs provide NRZ encoded data

to the PHY.

TXOFF

This TTL input forces the NRZ driver to

a high impedence state when asserted

low and shuts off transmit bias currrent.

RRSET1,

RRSET2

Internal time constants controlling

the equalizer’s transfer function

are set by an external resistor

connected across these pins.

RTSET1,

RTSET2

An external 1% resistor connected

between these pins controls the

transmitter output current amplitude.

= 32 x 1.25V/RTSET

CMREF

This pin provides a DC common

mode reference point for the

receiver inputs.

OUT

TVCCA,

TVCCD

Separate analog and digital

transmitter power supply pins help to

isolate sensitive circuitry from noise

generating digital functions. Both

supplies are nominally +5 volts.

RVCCA,

RVCCD

Analog and digital supply pins are

separated to isolate clean and

noisy circuit functions. Both

supplies are nominally +5 volts.

TGNDA,

TGNDD

Analog and digital transmitter grounds

provide separate return paths for clean

and noisy signals.

RGND

Receiver ground.

ML6674

Storage Temperature ................................ –65°C to 150°C

Lead Temperature (Soldering, 10 sec) ..................... 260°C

ABSOLUTE MAXIMUM RATINGS

Thermal Resistance (q )

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.

PLCC ............................................................... 60°C/W

TQFP ............................................................... 80°C/W

OPERATING CONDITIONS

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

VCC Supply Voltage .......................................... 5V ± 5%

T , 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, T = T

to T , VCC = 5V ±5%, RTSET = 2.0ký. (Note 1)

MAX

MIN

PARAMETER

DC Characteristics

Supply Current

RVCCD

CONDITIONS

MIN

TYP

MAX

UNITS

RVCCA

TVCCD

TVCCA

RVCCD + RVCCA + TVCCD + TVCCA

TTL Inputs (TXOFF, LPBK)

185

0.8

V_ILInput Low Voltage

V_IHInput High Voltage

2.0

2.2

Differential Inputs (TPIN±, TXIN±)

TPIN+, TPIN–

Common Mode Input Voltage

V_CC

1.5

TPIN+, TPIN–

Differential Input Voltage

TPIN+, TPIN–

Differential Input Resistance

µA

TPIN+, TPIN–

Common Mode Input Current

+10

TXIN+, TXIN–

Input Voltage HIGH (V_IH)

V_CC–1.165

V_CC–1.810

0.5

V_CC–0.88

V_CC–1.475

TXIN+, TXIN–

Input Voltage LOW (V_IL)

TXIN+, TXIN–

Input Current LOW (I_IL)

µA

TXIN+, TXIN–

Input Current HIGH (I_IH)

Differential Outputs (SD±, RXOUT±, TPOUT±)

SD+, SD–, RXOUT+, RXOUT–

Output Voltage HIGH (V_OH

)

Note 3

V_CC–1.025

V_CC–1.81

19.0

V_CC–0.88

V_CC–1.62

21.0

SD+, SD–, RXOUT+, RXOUT–

Output Voltage LOW (V_OL

)

TPOUT+, TPOUT–

Differential Output Current HIGH

V_OUT= V_CC± 0.5, Note 2

ML6674

ELECTRICAL CHARACTERISTICS ^(CONTINUED)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Differential Outputs (SD±, RXOUT±, TPOUT±) (Continued)

TPOUT+, TPOUT–

DifferentialOutput Current LOW

V_OUT= V_CC± 0.5, Note 2

0.1

0.5

TPOUT+, TPOUT–

Output Current Offset

TPOUT+, TPOUT–V_OUT= V_CC

Output Amplitude Error

Note 2

–5.0

–2.0

5.0

TPOUT+, TPOUT–V_OUT= V_CC±1.1V

Output Voltage Compliance

+2.0

AC Characteristics

TPOUT+, TPOUT–

Rise/Fall Time

1.5

2.0

0.5

2.5

TPOUT+, TPOUT–

Output Jitter

RXOUT+, RXOUT–

Rise/Fall Time

RXOUT+, RXOUT–

Output Jitter

2.0

Note 1. Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions.

Note 2. Output current amplitude is determined by I_OUT= 32 x 1.25V/RTSET.

Note 3. Output voltage levels are specified when terminated by 50W to V_CC-2V or equivalent load.

ML6674

FUNCTIONAL DESCRIPTION

The ML6674 transceiver is a physical media dependent

transceiver that allows the transmission and reception of

155 Mbps data over 100 meters over shielded twisted pair

cable or category 5 unshielded twisted pair cable.

high impedance state and no current flows through the

transformer.

ADAPTIVEEQUALIZATION

The transmit section accepts NRZ data, sending the

information on a two pin current driven transmitter. The

transmitted output passes through an external low pass

filter and transformer before entering the connectors to the

STP or UTP cable. The output amplitude of the transmitted

signal is programmable through the external RTSET

resistor.

During transmission of data over UTP (unshielded twisted

pair), distortion and ISI are caused by dispersion in the

cable. Equalization is used to overcome this signal

corruption. However, the distortion is frequency

dependent and cable length dependent. Therefore, in most

practical cases, the TP port characteristic is unknown and

it is impractical to tune the equalizer specifically to each

individual port. Hence, adaptive equalizer is used in the

TP-PMD to ensue proper compensation of the received

signal.

The receive section accepts NRZ coded data after it

passes through an isolation transformer and band limiting

filter. The adaptive equalizer is used to compensate for

the amplitude and phase distortion incurred from the

cable. The adaptive control section determines the signal

amplitude (and therefore the cable length) and adjusts the

equalizer accordingly. As the input signal amplitude

diminishes, the amount of equalization increases until it

reaches its maximum (Figure 1).

By using adaptive equalizer, the receiver automatically

compensates different length of cable without over

equalizing or under equalizing the line. The ML6674

monitors the amplitude of the received signal to

determine the cable length and adjust the equalizer

accordingly. The input signal level is inversely

proportional to the cable length. Therefore, as the signal

level decreases, the amount of equalization is increased

to compensate for the line loss.

The receiver also includes the Baseline Wander correction

circuitry. The circuit will compensate and track the DC

baseline wander caused by DC imbalance of the received

data. A 10pF capacitor can be connected between TPIN+

and TPIN– to improve Bit Error Rate.

ML6672COMPATIBILITY

The ML6674 implements the Baseline Wander correction

circuit, in addition to providing the functionality of the

existing ML6672 device. The ML6674 is plug-compatible

with the ML6672 with the following notes:

The adaptive control block governs both the equalization

level as well as the signal detection status. Signal detect

is asserted when the equalizer control loop settles, or

when loop back is asserted. When the input signal is

small, the equalization will be at its maximum.

•

In the ML6674 design, the RTSET resistor must be

2.0kW

After the signal has been equalized, it is fed through the

loopback multiplexer onto the RXOUT± pins.

•

In the ML6674 design, the following passive

components used in the ML6672 design may be

eliminated from the ML6674 design

Figure 1 shows a typical gain vs frequency plot of the

adaptive equalizer for 0, 25, 50, 75 and 100 meter

category 5 cable lengths.

—

RSET resistor

RTH resistor

CAP1 capacitor

CAP2 capacitor

TRANSMISSION

PECL level scrambled NRZ data is received by the

ML6674 and the current driven transmitter then sent the

data to the filter/transformer module. The transmit

amplitude is controlled by one external resistor, RTSET.

32 × 1.25V

I_OUT

RTSET

For ATM UTP applications the transmit amplitude is 1V

peak to peak. The termination at the transmitter output is

50ý. Therefore the transmit current I

Thus,

= 1/50 = 20 mA.

OUT

32 × 1.25V

RTSET =

= 2kΩ

20mA

1 x 10

The transmitter may be disabled via the TXOFF pin. When

this pin is pulled low, the transmitter’s output goes to a

Figure 1. Equalization Range

ML6674

+5.0V

+5.0V +5.0V

+5.0V

0.1µF

2.0K 1%

0.1µF

RTSET1

RVCCD TVCCD TVCCA

RTSET2

RVCCA

TPOUT+

TXIN+

FROM PHY

TXIN–

TRANSFORMER

FILTER

MODULE

TO MIC

NOTE 1

TO PHY

SD+

SD–

TPOUT–

TPIN+

ML6674 ATM UTP

TRANSCEIVER

RXOUT+

RXOUT–

CMREF

TO PHY

10pF

TRANSFORMER

FILTER

FROM MIC

MODULE

TPIN–

TGNDD TGNDA

LPBK

RGND

RRSET1 RRSET2

9.53K 1%

TXOFF

0.1µF

FOR THE TRANSFORMER

CM CHOKE, USE:

FROM PHY

XFMRS INC. XF3506SIP

BEL FUSE 0558-5999-00

VALOR PT4172

PULSE PE-68508

Application Example of ML6674 Configured for 1.0V Transmit Amplitude on C5 UTP.

P-P

Note 1. Split 100K ECL terminations are 82W and 130W to VCC and GND respectively.

Note 2. Recommended power supply bypass capacitors are 0.1µF with optional 10µF tantalum in parallel.

Note 3. Transformer turns ratio is 1:1.

Note 4. LPBK and TXOFF inputs are active LOW.

ML6674

PHYSICAL DIMENSIONS ^{inches (millimeters)}

Package: Q32

32-Pin PLCC

0.485 - 0.495

(12.32 - 12.57)

0.098 - 0.112

(2.49 - 2.85)

0.450 - 0.456

(11.43 - 11.58)

PIN 1 ID

0.042 - 0.048

(1.07 - 1.22)

0.490 - 0.530

(12.45 - 13.46)

0.550 - 0.556 0.585 - 0.595

(13.97 - 14.12) (14.86 - 15.11)

0.025 - 0.045

(0.63 - 1.14)

(RADIUS)

0.019 - 0.021

(0.48 - 0.51)

0.050 BSC

(1.27 BSC)

0.026 - 0.032

(0.66 - 0.81)

0.165 - 0.180

(4.06 - 4.57)

0.148 - 0.156

(3.76 - 3.96)

0.013 - 0.021

(0.33 - 0.53)

0.390 - 0.430

(9.90 - 10.92)

SEATING PLANE

Package: H32-7

32-Pin (7 x 7 x 1mm) TQFP

0.354 BSC

(9.00 BSC)

0º - 8º

0.276 BSC

(7.00 BSC)

0.003 - 0.008

(0.09 - 0.20)

PIN 1 ID

0.276 BSC

(7.00 BSC)

0.354 BSC

(9.00 BSC)

0.018 - 0.030

(0.45 - 0.75)

SEATING PLANE

0.048 MAX

(1.20 MAX)

0.032 BSC

(0.8 BSC)

0.012 - 0.018

(0.29 - 0.45)

0.037 - 0.041

(0.95 - 1.05)

ML6674

ORDERING INFORMATION

PART NUMBER

ML6674CQ

TEMPERATURE RANGE

0°C to 70°C

PACKAGE

32-Pin PLCC (Q32)

32-Pin TQFP (H32-7)

ML6674CH

0°C to 70°C

Micro Linear Corporation

2092 Concourse Drive

San Jose, CA 95131

Tel: 408/433-5200

Fax: 408/432-0295

www.microlinear.com

is a registered trademark of Micro Linear Corporation. All other

trademarks are the property of their respective owners.

Products described herein may be covered by one or more of the following U.S. patents: 4,897,611;

4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; 5,546,017;

5,559,470; 5,565,761; 5,592,128; 5,594,376; 5,652,479; 5,661,427; 5,663,874; 5,672,959; 5,689,167;

5,714,897; 5,717,798; 5,742,151; 5,747,977; 5,754,012; 5,757,174; 5,767,653; 5,777,514; 5,793,168;

5,798,635; 5,804,950; 5,808,455; 5,811,999; 5,818,207; 5,818,669; 5,825,165; 5,825,223; 5,838,723;

5.844,378; 5,844,941. Japan: 2,598,946; 2,619,299; 2,704,176; 2,821,714. Other patents are pending.

Micro Linear makes no representations or warranties with respect to the accuracy, utility, or completeness

of the contents of this publication and reserves the right to makes changes to specifications and product

descriptions at any time without notice. No license, express or implied, by estoppel or otherwise, to any

patents or other intellectual property rights is granted by this document. The circuits contained in this

document are offered as possible applications only. Particular uses or applications may invalidate some of

the specifications and/or product descriptions contained herein. The customer is urged to perform its own

engineering review before deciding on a particular application. Micro Linear assumes no liability

whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of Micro Linear

products including liability or warranties relating to merchantability, fitness for a particular purpose, or

infringement of any intellectual property right. Micro Linear products are not designed for use in medical,

life saving, or life sustaining applications.

DS6674-01

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