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PDF MAX3746 Data sheet ( Hoja de datos )
| Número de pieza | MAX3746 | |
| Descripción | Limiting Amplifier | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3386; Rev 2; 6/07
Low-Power, 622Mbps to 3.2Gbps
Limiting Amplifier
General Description
The MAX3746 multirate limiting amplifier functions as a
data quantizer for SONET, Fibre-Channel, and Gigabit
Ethernet optical receivers. The amplifier accepts a wide
range of input voltages and provides selectable-level,
current-mode logic (CML) output voltages with con-
trolled edge speeds. A received-signal-strength indica-
tor (RSSI) is available when the MAX3746 is
DC-coupled to the MAX3744/MAX3724 SFP transim-
pedance amplifier (TIA). A receiver consisting of the
MAX3744/MAX3724 and the MAX3746 can provide up
to 19dB RSSI dynamic range. Additional features
include a programmable loss-of-signal (LOS) detect, an
optional disable function (DISABLE), and an
output-signal polarity reversal (OUTPOL). Output dis-
able can be used to implement squelch.
The combination of the MAX3746 and the MAX3744/
MAX3724 allows for the implementation of all the small-
form-factor SFF-8472 digital diagnostic specifications
using a standard 4-pin TO-46 header.
The MAX3746 is pin-for-pin compatible with the
MAX3748A limiting amplifier and consumes 30% less
power. The MAX3746 is packaged in a 3mm x 3mm,
16-pin QFN package.
Applications
Gigabit Ethernet SFF/SFP Transceiver Modules
Fibre-Channel SFF/SFP Transceiver Modules
Multirate OC-12 to OC48-FEC SFF/SFP
Transceiver Modules
Features
♦ SFP Reference Design Available
♦ Low 115mW Power Consumption
♦ 16-Pin QFN Package with 3mm x 3mm Footprint
♦ 70ps Rise and Fall Time
♦ Loss-of-Signal with Programmable Threshold
♦ RSSI Interface (with MAX3744/MAX3724 TIA)
♦ Output Disable
♦ Polarity Select
♦ 8.4psP-P Deterministic Jitter (3.2Gbps)
♦ Improved EMI Performance
♦ Selectable CML Output levels
♦ Pin Compatible with MAX3748A
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG CODE
MAX3746ETE -40°C to +85°C 16 Thin QFN T1633F-3
MAX3746HETE* -40°C to +85°C 16 Thin QFN T1633F-3
*The MAX3746HETE is a hybrid lead-free package. See the
Detailed Description section for more information.
Pin Configuration appears at end of data sheet.
Typical Operating Circuits continued at end of data sheet.
Typical Operating Circuits
4-PIN TO HEADER
SFP OPTICAL RECEIVER
OUTPOL
VCC
SUPPLY FILTER
HOST BOARD
HOST FILTER
VCC_RX
MAX3744 TIA
DS1859
3-INPUT DIAGNOSTIC
MONITOR
R1
3kΩ
IN+
IN-
MAX3746
RSSI TH
GND
RTH = 14kΩ
C1
0.1μF
OUT+
OUT-
0.1μF
0.1μF
DISABLE LOS
50Ω
SERDES
50Ω
4.7kΩ TO 10kΩ
2.97V TO 3.6V
LOS
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
Low-Power, 622Mbps to 3.2Gbps
Limiting Amplifier
Typical Operating Characteristics (continued)
(VCC = +3.3V, TA = +25°C, unless otherwise noted.)
RANDOM JITTER
vs. INPUT AMPLITUDE
10
9
8
7
6
5
4
3
2
1
0
0 5 10 15 20 25 30 35 40
DIFFERENTIAL INPUT (mVP-P)
BIT-ERROR RATIO
vs. INPUT VOLTAGE
1200
1000
800
600
400
200
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (mVP-P)
DETERMINISTIC JITTER
vs. INPUT COMMON-MODE VOLTAGE
(2.7Gbps, K28.5)
24
22
20
18
16
14
12
10
-1.0 -0.9 -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0
COMMON-MODE VOLTAGE (VCC + X)
OUTPUT EYE DIAGRAM
(MINIMUM INPUT)
MAX3746 toc07
3.2Gbps, K28.5, 4mVP-P
OUTPUT EYE DIAGRAM
(MAXIMUM INPUT)
MAX3746 toc08
3.2Gbps, K28.5, 1200mVP-P
OUTPUT EYE DIAGRAM
(MINIMUM INPUT)
MAX3746 toc09
2.7Gbps, 223 - 1 PRBS, 4mVP-P
50ps/div
50ps/div
100ps/div
OUTPUT EYE DIAGRAM
(MAXIMUM INPUT)
MAX3746 toc10
2.7Gbps, 223 - 1 PRBS, 1200mVP-P
OUTPUT EYE DIAGRAM AT +100°C
(MINIMUM INPUT)
MAX3746 toc11
2.7Gbps, 223 - 1 PRBS, 4mVP-P
ASSERT/DEASSERT LEVELS vs. RTH
120
100
80 DEASSERT
60
40
20 ASSERT
50ps/div
50ps/div
0
0 10 20 30
RTH (kΩ)
_______________________________________________________________________________________ 5
5 Page 
Low-Power, 622Mbps to 3.2Gbps
Limiting Amplifier
Typical Operating Circuits (continued)
VCC (+3.3V OR APD
REFERENCE VOLTAGE)
MAX4004
PIN OR
APD
MAX3744 TIA
DS1859
3-INPUT DIAGNOSTIC
MONITOR
SFP OPTICAL RECEIVER
VCC (+3.3V)
5-PIN TO HEADER
OUTPOL
CIN
0.1μF
IN+
VCC
SUPPLY FILTER
OUT+
COUT
0.1μF
IN-
CIN
0.1μF
MAX3746
RSSI TH
OUT-
COUT
0.1μF
GND DISABLE LOS
RTH = 14kΩ
HOST BOARD
HOST FILTER
VCC_RX
50Ω
SERDES
50Ω
4.7kΩ TO 10kΩ
2.97V TO 3.6V
LOS
Pin Configuration
GND N.C. N.C. RSSI
16 15 14 13
VCC1 1
12 VCC2
IN+ 2
IN- 3
MAX3746
11 OUT+
10 OUT-
VCC1 4
9 OUTPOL
5678
TH DISABLE LOS GND
3mm x 3mm QFN
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX3746.PDF ] | |
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