MAX3991UTG+T【PDF 1/12 页】IC DATA RECOVERY W/AMP 24-TQFN

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General Description

The MAX3991 is a 10Gbps clock and data recovery

(CDR) with limiting amplifier IC for XFP optical receivers.

The MAX3991 and the MAX3992 (CDR with equalizer)

form a signal conditioner chipset for use in XFP trans-

ceiver modules. The chipset is XFI compliant and offers

multirate operation for data rates from 9.95Gbps to

11.1Gbps.

The MAX3991 has 7mVP-P input sensitivity (BER

≤ 10-12),

which allows direct connection to a transimpedance

amplifier without the use of a stand-alone limiting amplifi-

er. The phase-locked loop (PLL) is optimized for jitter tol-

erance and provides 0.6UI of high-frequency tolerance

in SONET, Ethernet, and Fibre-Channel applications. The

MAX3991 output provides 27% margin to the XFP eye

mask specification.

An AC-based power detector toggles the loss-of-signal

(LOS) output when the input signal swing is below the

user-programmed assert threshold. An external refer-

ence clock, with frequency equal to 1/64 or 1/16 of the

serial data rate is used to aid in frequency acquisition. A

loss-of-lock (LOL) indicator is provided to indicate the

lock status of the receiver PLL.

The MAX3991 is available in a 4mm x 4mm, 24-pin QFN

package. It consumes 350mW from a single +3.3V supply

and operates over the 0°C to +85°C temperature range.

Applications

9.95Gbps to 11.1Gbps Optical XFP Modules

SONET OC-192/SDH STM-64 XFP Transceivers

10.3Gbps/11.1Gbps Ethernet XFP Transceivers

10.5Gbps Fibre-Channel XFP Transceivers

10Gbps DWDM Transceivers

Features

Multirate Operation from 9.95Gbps to 11.1Gbps

7mVP-P Input Sensitivity (BER ≤ 10-12)

0.6UIP-P Total High-Frequency Jitter Tolerance

Low-Output Jitter Generation: 7mUIRMS

Low-Output Deterministic Jitter: 4.6psP-P

XFI-Compliant Output Interface

LOS Indicator with Programmable Threshold

LOL Indicator

Power Dissipation: 350mW

MAX3991

10Gbps Clock and Data Recovery

with Limiting Amplifier

________________________________________________________________ Maxim Integrated Products

19-3486; Rev 1; 11/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX3991UTG

0°C to +85°C

24 QFN

T2444-4

MAX3991UTG+*

0°C to +85°C

24 QFN

T2444-4

VCC

GND

SDI+

SDI-

GND

VCC

GND

SDO+

SDO-

GND

VCC

SCLKO+

SCLKO-

FCTL2

POL

CFIL

VTH

FCTL1

REFCLK-

REFCLK+

LOS

LOL

MAX3991

4mm x 4mm QFN*

*THE EXPOSED PAD MUST BE CONNECTED TO CIRCUIT-BOARD GROUND FOR

PROPER THERMAL AND ELECTRICAL PERFORMANCE.

TOP VIEW

Pin Configuration

Typical Application Circuit appears at end of data sheet.

*Future product—contact factory for availability.

+Denotes lead-free package.

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