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MAX3747AEUB+T

P1-P3P4-P6P7-P9P10-P11
19-0281; Rev 2; 8/12
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
155Mbps to 3.2Gbps, Low-Power SFP
Limiting Amplifiers
EVALUATION KIT AVAILABLE
MAX3747A/MAX3747B
Typical Application Circuit
General Description
The MAX3747A/MAX3747B multirate limiting amplifiers
function as data quantizers for OC-3 through OC-48 syn-
chronous optical network (SONET), Fibre-Channel, and
Gigabit Ethernet optical receivers. They are pin-for-pin
compatible with the SY88993V from Micrel
Semiconductor, Inc. The amplifiers accept a wide range
of input voltages and provide constant-level, current-
mode logic (CML) output voltages with controlled edge
speeds. The MAX3747A/MAX3747B output voltages are
800mV
P-P
. The MAX3747B has enhanced LOS operation
under overload conditions.
The MAX3747A/MAX3747B limiting amplifiers feature a
programmable loss-of-signal detect (LOS) and an
optional disable function (DISABLE) that can be com-
bined to implement squelch.
The MAX3747A/MAX3747B are available in a 3mm, 10-
pin µMAX® package ideal for small form-
factor receivers.
Applications
Gigabit Ethernet SFP/SFF Optical Transceiver Modules
1G/2G Fibre-Channel SFP/SFF Optical Transceiver
Modules
Multirate OC-3 to OC-48 FEC SFP/SFF Optical
Transceiver Modules
10G LX4 Transceiver Modules
Features
o Pin Compatible with Micrel SY88993V
o 155Mbps to 3.2Gbps Operation
o > 57dB of Gain
o < 10
-
12
BER with 2mV
P-P
Input Amplitude
o 18mA Supply Current
o Chatter-Free LOS with Programmable Threshold
o Output DISABLE Function
o PECL-Compatible Inputs
Ordering Information
MAX3745
SUPPLY FILTER
V
CC
MAX4004
DS1859
V
CC
3-INPUT
DIAGNOSTIC
MONITOR
SFP OPTICAL RECEIVER
5-PIN TO-HEADER
HOST BOARD
HOST FILTER
SERDES
50Ω
50Ω
MAX3747A
MAX3747B
V
REF
TH GND LOS DISABLE
IN-
IN+
OUT-
OUT+
V
CC
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
50Ω 50Ω
R
TH1
R
TH2
R
TH1
+ R
TH2
≥ 5kΩ
V
CC_
RX
V
CC_
HOST
LOS
4.7kΩ TO 10kΩ
PART TEMP RANGE PIN-PACKAGE
MAX3747AEUB+ -40°C to +85°C 10 µMAX
MAX3747BEUB+ -40°C to +85°C 10 µMAX
Pin Configuration appears at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
MAX3747A/MAX3747B
155Mbps to 3.2Gbps, Low-Power SFP
Limiting Amplifiers
2
Maxim Integrated
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +2.97V to +3.63V, CML output load is 50Ω to V
CC
, T
A
= -40°C to +85°C. Typical values are at V
CC
= +3.3V and T
A
= +25°C,
unless otherwise specified.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Power-Supply Voltage (V
CC
) .................................-0.5V to +4.5V
Voltage at IN+, IN- ..........................(V
CC
- 2.4V) to (V
CC
+ 0.5V)
Voltage at DISABLE, LOS, TH, V
REF
..........-0.5V to (V
CC
+ 0.5V)
Current into LOS ...................................................-1mA to +9mA
Current into V
REF
..................................................................2mA
Differential Input Voltage (IN+ - IN-) .....................................2.5V
Continuous Current at CML Outputs
(OUT+, OUT-) ..............................................-25mA to +25mA
Continuous Power Dissipation (T
A
= +70°C)
10-Pin µMAX (derate 6.9mW/°C above +70°C) ...........552mW
Operating Junction Temperature Range (T
J
) .......-55°C to +150°C
Storage Ambient Temperature Range (T
S
)...........-55°C to +150°C
Lead Temperature (soldering, 10s)......................................+300°C
Soldering Temperature (reflow)............................................+260°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
POWER SUPPLY
M AX 3747A i ncl ud i ng the C M L outp ut cur r ent 36 41
M AX 3747B i ncl ud i ng the C M L outp ut cur r ent 38 43
MAX3747A excluding the CML output
current
18 24
Supply Current (Note 2) I
CC
MAX3747B excluding the CML output
current
20 26
mA
Power-Supply Noise Rejection PSNR f < 2MHz 30 dB
INPUT SPECIFICATION
Input Sensitivity V
IN-MIN
(Note 3) 4 mV
P
-
P
Input Overload V
IN-MAX
(Note 3) 1200 mV
P
-
P
OUTPUT SPECIFICATION
Output Resistance R
OUT
(Note 4) 42 50 58 Ω
Differential Output Return Loss DUT is powered on, f < 3GHz 15 dB
CML Differential Output Voltage
MAX3747A/MAX3747B
4mV
P-P
≤ V
IN
≤ 1200mV
P-P
600 800 1000 mV
P
-
P
Differential Output Signal When
Disabled
AC-coupled outputs, V
IN-MAX
applied to the
input (Note 4)
15 mV
P
-
P
Data-Output Transition Time 20% to 80% (Note 4) 70 120 ps
TRANSFER CHARACTERISTIC
K28.5 pattern at 3.2Gbps 13.2 19
PRBS 2
23
- 1 equivalent pattern at 2.7Gbps
(Note 6)
14 25
K28.5 pattern at 2.1Gbps 12 17
Deterministic Jitter (Notes 4, 5) DJ
P RBS 2
2 3
- 1 eq ui val ent p atter n at 155M b p s
(Note 6)
85 150
ps
P
-
P
Random Jitter V
IN
= 4mV
P-P
(Notes 4, 7) 3.5 5 ps
RMS
MAX3747A/MAX3747B
155Mbps to 3.2Gbps, Low-Power SFP
Limiting Amplifiers
3
Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.97V to +3.63V, CML output load is 50Ω to V
CC
, T
A
= -40°C to +85°C. Typical values are at V
CC
= +3.3V and T
A
= +25°C,
unless otherwise specified.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input-Referred Noise V
IN
= 4mV
P-P
(Note 4) 120 150 µV
RMS
Low-Frequency Cutoff 6.4 kHz
LOS Hysteresis 10log(V
DEASSERT
/ V
ASSERT
) (Note 4) 1.25 dB
MAX3747A (Notes 4, 8)
LOS Assert/Deassert Time
MAX3747B (Notes 4, 8, 9)
2.3 40.0 µs
Low LOS Assert Level V
TH
= -1.3V (Notes 4, 10) 2.5 4.1 5.9 mV
P
-
P
Low LOS Deassert Level V
TH
= -1.3V (Notes 4, 10) 6.2 9.3 mV
P
-
P
Medium LOS Assert Level V
TH
= -0.68V (Notes 4, 10) 22.0 29.0 36.0 mV
P
-
P
Medium LOS Deassert Level V
TH
= -0.68V (Notes 4, 10) 44.8 62.0 mV
P
-
P
High LOS Assert Level V
TH
= -0.114V (Notes 4, 10) 36.0 53.7 63.6 mV
P
-
P
High LOS Deassert Level V
TH
= -0.114V (Notes 4, 10) 86.0 115 mV
P
-
P
TTL/CMOS I/O
V
REF
Voltage V
REF
V
CC
-
1.35
V
CC
-
1.3V
V
CC
-
1.19
V
LOS Output High Voltage V
OH
R
LOS
= 4.7kΩ to 10kΩ to V
CC_HOST
(3V) 2.4 V
LOS Output Low Voltage V
OL
R
LOS
= 4.7kΩ to 10kΩ to V
CC_HOST
(3.6V) 0.4 V
DISABLE Input High V
IH
2.0 V
DISABLE Input Low V
IL
0.8 V
DISABLE Input Current R
LOS
= 4.7kΩ to 10kΩ to V
CC_HOST
10 µA
Note 1: The data-input transition time is controlled by a 4th-order Bessel filter with f
-3dB
= 0.75 x 2.667GHz for all data rates of
2.667Gbps and below. The f
-3db
= 0.75 x 3.2GHz for a data rate of 3.2Gbps.
Note 2: Supply current is measured with unterminated outputs or with AC-coupled output termination (see Figure 1).
Note 3: Between sensitivity and overload, all AC specifications are met and the output is 0.95 x limited output amplitude.
Note 4: Guaranteed by design and characterization.
Note 5: The deterministic jitter (DJ) caused by the input filter is not included in the DJ generation specification.
Note 6: The PRBS 2
23
- 1 equivalent pattern consists of a K28.5 pattern plus 240 ones plus K28.5 pattern plus 240 zeros.
Note 7: Random jitter was measured without using a filter at the input.
Note 8: The signal at the input is switched between two amplitudes, Signal_ON and Signal_OFF, as shown in Figure 2A.
Note 9: The signal at the input is switched between 1.2V
P-P
and Signal_OFF as shown in Figure 2B.
Note 10: V
TH
is the voltage at pin 5 referenced to V
CC
(see Figure 5).
P1-P3P4-P6P7-P9P10-P11

MAX3747AEUB+T

Mfr. #:
Buy MAX3747AEUB+T
Manufacturer:
Maxim Integrated
Description:
Limiting Amplifiers 155-3.2Gbps SFP
Lifecycle:
New from this manufacturer.
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