MAX3991UTG+ Maxim Integrated Products, MAX3991UTG+ Datasheet

IC DATA RECOVERY W/AMP 24-TQFN

MAX3991UTG+

Manufacturer Part Number
MAX3991UTG+
Description
IC DATA RECOVERY W/AMP 24-TQFN
Manufacturer
Maxim Integrated Products
Type
Clock and Data Recovery (CDR)r
Datasheet

Specifications of MAX3991UTG+

Input
CML
Output
CML
Frequency - Max
693MHz
Voltage - Supply
3 V ~ 3.6 V
Operating Temperature
0°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-TQFN Exposed Pad
Frequency-max
693MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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 7mV
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.
19-3486; Rev 1; 11/05
Typical Application Circuit appears at end of data sheet.
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.
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
________________________________________________________________ Maxim Integrated Products
P-P
General Description
input sensitivity (BER ≤ 10
10Gbps Clock and Data Recovery
Applications
-12
),
♦ Multirate Operation from 9.95Gbps to 11.1Gbps
♦ 7mV
♦ 0.6UI
♦ Low-Output Jitter Generation: 7mUI
♦ Low-Output Deterministic Jitter: 4.6ps
♦ XFI-Compliant Output Interface
♦ LOS Indicator with Programmable Threshold
♦ LOL Indicator
♦ Power Dissipation: 350mW
with Limiting Amplifier
*Future product—contact factory for availability.
+Denotes lead-free package.
MAX3991UTG
MAX3991UTG+*
*THE EXPOSED PAD MUST BE CONNECTED TO CIRCUIT-BOARD GROUND FOR
PROPER THERMAL AND ELECTRICAL PERFORMANCE.
TOP VIEW
PART
P-P
P-P
SDI+
GND
GND
SDI-
V
V
CC
CC
Input Sensitivity (BER ≤ 10
Total High-Frequency Jitter Tolerance
1
2
3
4
5
6
24
7
TEMP RANGE
0°C to +85°C
0°C to +85°C
4mm x 4mm QFN*
23
8
Ordering Information
MAX3991
22
9
Pin Configuration
21
10
11
20
PIN-
PACKAGE
24 QFN
24 QFN
19
12
-12
RMS
18
17
16
15
14
13
)
Features
P-P
V
GND
SDO+
SDO-
GND
V
CC
CC
T2444-4
T2444-4
CODE
PKG
1

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MAX3991UTG+ Summary of contents

Page 1

... XFI-Compliant Output Interface ♦ LOS Indicator with Programmable Threshold ♦ LOL Indicator ♦ Power Dissipation: 350mW PART MAX3991UTG MAX3991UTG+* *Future product—contact factory for availability. +Denotes lead-free package. Applications TOP VIEW *THE EXPOSED PAD MUST BE CONNECTED TO CIRCUIT-BOARD GROUND FOR PROPER THERMAL AND ELECTRICAL PERFORMANCE. ...

Page 2

Clock and Data Recovery with Limiting Amplifier ABSOLUTE MAXIMUM RATINGS Supply Voltage, V ..............................................-0.5V to +4.0V CC Input Voltage Levels (SDI+, SDI-, REFCLK+, REFCLK-) ....................................(V CC CML Output Voltage (SDO+, SDO-, SCLKO+, SLCKO-) ......................................(V CC Stresses beyond those listed ...

Page 3

ELECTRICAL CHARACTERISTICS (continued) (See Table 1 for operating conditions. Typical values at V PARAMETER JITTER SPECIFICATION Jitter Peaking Jitter Transfer Bandwidth Sinusoidal Jitter Tolerance Jitter Generation Serial Data Output Deterministic Jitter PLL ACQUISITION/LOCK SPECIFICATION Acquisition Time LOL Assert Time Maximum ...

Page 4

Clock and Data Recovery with Limiting Amplifier ELECTRICAL CHARACTERISTICS (continued) (See Table 1 for operating conditions. Typical values at V Note 1: Measured with 100mV differential amplitude. P-P Note 2: Guaranteed by design and characterization. Note 3: Measured from ...

Page 5

Figure 1. RX LOL Assert and PLL Acquisition Time DATA INPUT POWER LOS ASSERT TIME LOS LOL Figure 2. LOS Assert/Deassert Time _______________________________________________________________________________________ 10Gbps Clock and Data Recovery with Limiting Amplifier ∆f/f REFCLK 651ppm 500ppm LOL ASSERT TIME LOL *ASSERT ...

Page 6

Clock and Data Recovery with Limiting Amplifier (V = 3.3V +25°C, unless otherwise noted MAX3991 OUPTUT AFTER XFP CONNECTOR 31 (INPUT = 9.95328Gbps PATTERN, 10mV MAX3991 toc01 20ps/div SUPPLY-INDUCED OUTPUT JITTER 0.07 0.06 ...

Page 7

T = +25°C, unless otherwise noted SDD22 vs. FREQUENCY XFI -5 -10 -15 -20 -25 -30 -35 -40 100M 1G 10G FREQUENCY (mHz) PIN NAME 1, 6, 11, 13 +3.3V ...

Page 8

Clock and Data Recovery with Limiting Amplifier PIN NAME Positive Reference Clock Input, Digital. The REFCLK inputs are designed to be AC-coupled to the reference clock source. REFCLK± have a 200Ω differential impedance. See the Detailed Description 21 REFCLK+ ...

Page 9

The integrated PLL recovers a synchronous clock, which is used to retime the input data. Connect a 0.047µF capacitor between CFIL and V PLL dampening. The external reference connected to REFCLK aids in frequency acquisition. Because the ref- erence clock ...

Page 10

Clock and Data Recovery with Limiting Amplifier 50Ω REFERENCE CLOCK 50Ω TRANSCEIVER TERMINATION Figure 5. Reference Clock Termination Table 3. Functional Control FCTL1 FCTL2 DESCRIPTION Normal operation, serial clock output 0 0 disabled Standby power-down mode. 0 ...

Page 11

VCC 50Ω 50Ω GND Figure 7. CML Output Model (SDI+) - (SDI-) (SDO+) - (SDO-) POL = VCC (SDO+) - (SDO-) POL = GND Figure 8. Polarity (POL) Function ______________________________________________________________________________________ 10Gbps Clock and Data Recovery with Limiting Amplifier SDO+ SDO- ...

Page 12

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products V CC 0.047µ ...

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