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19-2717; Rev 6; 6/11
EVAALVUAAILTAIOBNLEKIT
Compact 155Mbps to 4.25Gbps
Limiting Amplifier
General Description
The MAX3748 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 constant-level
current-mode logic (CML) output voltages with con-
trolled edge speeds.
A received-signal-strength indicator (RSSI) is available
when the MAX3748 is combined with the MAX3744 SFP
transimpedance amplifier (TIA). A receiver consisting of
the MAX3744 and the MAX3748 can provide up to
19dB RSSI dynamic range. Additional features include
a programmable loss-of-signal (LOS) detect, an option-
al disable function (DISABLE), and an output signal
polarity reversal (OUTPOL). Output disable can be
used to implement squelch.
The combination of the MAX3748 and the MAX3744
allows for the implementation of all the small-form-factor
SFF-8472 digital diagnostic specifications using a stan-
dard 4-pin TO-46 header. The MAX3748 is packaged in
a 3mm x 3mm, 16-pin thin QFN package with an
exposed pad.
Applications
Gigabit Ethernet SFF/SFP Transceiver Modules
Fibre Channel SFF/SFP Transceiver Modules
Multirate OC-3 to OC-48-FEC SFF/SFP
Transceiver Modules
Features
SFP Reference Design Available
16-Pin TQFN Package with 3mm x 3mm Footprint
Single 3.3V Supply Voltage
86ps Rise and Fall Time
Loss of Signal with Programmable Threshold
RSSI Interface (with MAX3744 TIA)
Output Disable
Polarity Select
8.7psP-P Deterministic Jitter (4.25Gbps)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX3748HETE#G16* -40°C to +85°C 16 TQFN-EP**
MAX3748ETE
-40°C to +85°C 16 TQFN-EP**
H = hybrid lead-free package. *See Detailed Description for
more information. The MAX3748H is the MAX3748 in a hybrid
lead-free package.
#Denotes a RoHS-compliant device that may include lead that
is exempt under the RoHS requirements.
**EP = Exposed pad.
Functional Diagram and Pin Configuration appear at end of
data sheet.
Typical Operating Circuits
SFP OPTICAL RECEIVER
HOST BOARD
4-PIN TO HEADER
MAX3744 TIA
OUTPOL
IN+
IN-
0.1μF
SUPPLY FILTER
VCC CAZ1 CAZ2
0.1μF
OUT+
0.1μF
OUT-
HOST FILTER
VCC_RX
50Ω
SERDES
50Ω
DS1858
3-INPUT DIAGNOSTIC
MONITOR
R1
3kΩ
MAX3748
RSSI TH
C1
0.1μF
RTH
GND
DISABLE LOS
4.7kΩ TO 10kΩ
VCC_HOST
LOS
Typical Operating Circuits continued at end of data sheet.
________________________________________________________________ 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.

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Compact 155Mbps to 4.25Gbps
Limiting Amplifier
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage (VCC) .................................-0.5V to +6.0V
Voltage at IN+, IN- ..........................(VCC - 2.4V) to (VCC + 0.5V)
Voltage at DISABLE, OUTPOL, RSSI,
CAZ1, CAZ2, LOS, TH............................-0.5V to (VCC + 0.5V)
Current into LOS ...................................................-1mA to +9mA
Differential Input Voltage (IN+ - IN-) .....................................2.5V
Continuous Current at CML Outputs
(OUT+, OUT-) ...............................................-25mA to +25mA
Continuous Power Dissipation (TA = +70°C)
TQFN (derate 17.7mW above +70°C)..............................1.4W
Operating Junction Temperature Range (TJ) ....-55°C to +150°C
Storage Ambient Temperature Range (Ts)........-55°C to +150°C
Lead Temperature (soldering, 10s) .................................+260°C
Soldering Temperature (reflow)
TQFN............................................................................+240°C
Hybrid TQFN ................................................................+250°C
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.
ELECTRICAL CHARACTERISTICS
(VCC = 2.97V to 3.63V, ambient temperature = -40°C to +85°C, CML output load is 50Ω to VCC, CAZ = 0.1µF, typical values are at
+25°C, VCC = 3.3V, unless otherwise specified. The data input transition time is controlled by a 4th-order Bessel filter with f-3dB =
0.75 2.667GHz for all data rates of 2.667Gbps and below, and with f-3dB = 0.75 data rate for data rates > 3.2Gbps.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Single-Ended Input Resistance
Input Return Loss
Single ended to VCC
42 50 58

Differential, f < 3GHz, DUT is powered on
13
dB
Input Sensitivity
VIN-MIN (Note 1)
5 mVP-P
Input Overload
VIN-MAX (Note 1)
1200
mVP-P
Single-Ended Output Resistance
Single ended to VCC
42 50 58

Output Return Loss
Differential, f < 3GHz, DUT is powered on
10
dB
Differential Output Voltage
600 780 1200 mVP-P
Differential Output Signal when
Disabled
Outputs AC-coupled, VIN-MAX applied to
input (Note 2)
10 mVP-P
K28.5 pattern at 4.25Gbps
8.7 25
Deterministic Jitter
(Notes 2, 3)
K28.5 pattern at 3.2Gbps
DJ 223- 1 PRBS equivalent pattern at 2.7Gbps
(Note 4)
8.5 25
9.3 30 psP-P
K28.5 pattern at 2.1Gbps
223- 1 PRBS equivalent pattern at 155Mbps
7.8 25
25 50
Random Jitter
(Note 5)
Data Output Transition Time
Input-Referred Noise
Low-Frequency Cutoff
Power-Supply Current
Power-Supply Noise Rejection
Input = 5mVP-P
Input = 10mVP-P
20% to 80%, 4.25Gbps
3.1875GHz Bessel input filter
VIN = 20mVP-P
20% to 80% (Note 2)
ICC
PSNR
CAZ = open
CAZ = 0.1μF
(Note 6)
LOS disabled
f < 2MHz
6.5
psRMS
3
60
ps
86 115
185 μVRMS
70
kHz
0.8
32 49
mA
37
26 dB
2 _______________________________________________________________________________________

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Compact 155Mbps to 4.25Gbps
Limiting Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.97V to 3.63V, ambient temperature = -40°C to +85°C, CML output load is 50Ω to VCC, CAZ = 0.1µF, typical values are at
+25°C, VCC = 3.3V, unless otherwise specified. The data input transition time is controlled by a 4th-order Bessel filter with f-3dB =
0.75 2.667GHz for all data rates of 2.667Gbps and below, and with f-3dB = 0.75 data rate for data rates > 3.2Gbps.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
LOSS OF SIGNAL at 4.25Gbps K28.5 pattern (Note 2)
LOS Hysteresis
10log (VDEASSERT/VASSERT)
LOS Assert/Deassert Time
(Note 8)
LOS Assert
RTH = 280k
LOS Deassert
LOSS OF SIGNAL at 2.5Gbps (Notes 2, 7)
RTH = 280k
LOS Hysteresis
10log (VDEASSERT/VASSERT)
LOS Assert/Deassert Time
(Note 8)
Low LOS Assert Level
Low LOS Deassert Level
Medium LOS Assert Level
RTH = 20k
RTH = 20k
RTH = 280
Medium LOS Deassert Level
High LOS Assert Level
High LOS Deassert Level
LOSS OF SIGNAL at 155Mbps (Note 7)
RTH = 280
RTH = 80
RTH = 80
LOS Hysteresis
LOS Assert/Deassert Time
10log (VDEASSERT/VASSERT)
(Note 8)
Low LOS Assert Level
Low LOS Deassert Level
Medium LOS Assert Level
Medium LOS Deassert Level
High LOS Assert Level
High LOS Deassert Level
RSSI
RTH = 20k
RTH = 20k
RTH = 280
RTH = 280
RTH = 80
RTH = 80
RSSI Current Gain (Note 9)
Input-Referred RSSI Current
Stability
ARSSI
ARSSI = IRSSI/ICM_RSSI
IRSSI/ARSSI
(Note 10)
ICM_INPUT < 6.6mA
ICM_INPUT > 6.6mA
TTL/CMOS I/O
LOS Output High Voltage
LOS Output Low Voltage
VOH
VOL
RLOS = 4.7k to10k to VCC_host (3V)
RLOS = 4.7k to10k to VCC_host (3.6V)
LOS Output Current
RLOS = 4.7k to10k to VCC_host (3.3V);
IC is powered down
1.25
2
2.2
18.5
28
dB
100 μs
mVP-P
mVP-P
1.25
2
2.8
10.3
22.8
2.2
4.1
6.7
15.2
25
38.3
65.2
100
11.6
38.6
99.3
dB
μs
mVP-P
mVP-P
mVP-P
mVP-P
mVP-P
mVP-P
2.1
20
3.5
5.6
13.3
21.2
33.3
55.5
dB
μs
mVP-P
mVP-P
mVP-P
mVP-P
mVP-P
mVP-P
0.03
-31 +33
-73 +90
μA
2.4 V
0.4 V
40 μA
DISABLE Input High
DISABLE Input Low
DISABLE Input Current
VIH
VIL
RLOS = 4.7k to 10k to VCC_host
2.0
V
0.8 V
10 μA
Note 1: Between sensitivity and overload, all AC specifications are met.
Note 2: Guaranteed by design and characterization.
Note 3: The deterministic jitter caused by this filter is not included in the DJ generation specifications (input).
_______________________________________________________________________________________ 3

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Compact 155Mbps to 4.25Gbps
Limiting Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.97V to 3.63V, ambient temperature = -40°C to +85°C, CML output load is 50Ω to VCC, CAZ = 0.1µF, typical values are at
+25°C, VCC = 3.3V, unless otherwise specified. The data input transition time is controlled by a 4th-order Bessel filter with f-3dB =
0.75 2.667GHz for all data rates of 2.667Gbps and below, and with f-3dB = 0.75 data rate for data rates > 3.2Gbps.)
Note 4: 223 - 1 PRBS pattern was substituted by K28.5 pattern to determine the high-speed portion of the deterministic jitter. The
low-speed portion of the DJ (baseline wander) was obtained by measuring the eye width difference between outputs gen-
erated using K28.5 and 223 - 1 PRBS patterns.
Note 5: Random jitter was measured without using a filter at the input.
Note 6: The supply current measurement excludes the CML output currents by connecting the CML outputs to a separate VCC
(see Figure 1).
Note 7: Unless otherwise specified, the pattern for all LOS detect specifications is 223 - 1 PRBS.
Note 8: The signal at the input is switched between two amplitudes, Signal_ON and Signal_OFF, as shown in Figure 2.
Note 9: ICM_INPUT is the input common mode. IRSSI is the current at the RSSI output.
Note 10: Stability is defined as variation over temperature and power supply with respect to the typical gain of the part.
4 _______________________________________________________________________________________

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Compact 155Mbps to 4.25Gbps
Limiting Amplifier
(TA = +25°C and VCC = 3.3V, unless otherwise specified.)
Typical Operating Characteristics
SUPPLY CURRENT
vs. TEMPERATURE
100
90
80
70
60
50
40
30
20
10
0
-40-30-20-10 0 10 20 30 40 50 60 70 80 90 100
TEMPERATURE (°C)
RANDOM JITTER
vs. INPUT AMPLITUDE
10
9
8
7
6
5
4
3
2
1
0
0 10 20 30 40
DIFFERENTIAL INPUT AMPLITUDE (mVP-P)
900
800
700
600
500
400
300
200
100
0
1
TRANSFER FUNCTION
OUTPUT VOLTAGE vs. INPUT VOLTAGE
2345
DIFFERENTIAL INPUT (mVP-P)
6
BIT-ERROR RATIO vs. INPUT VOLTAGE
1200
1000
800
600
400
200
0
2.0
2.5 3.0 3.5 4.0 4.5
INPUT VOLTAGE (mVP-P)
5.0
RANDOM JITTER vs. TEMPERATURE
(INPUT LEVEL 10mVP-P)
10
9
8
7
6
5
4
3
2
1
0
-40-30-20-10 0 10 20 30 40 50 60 70 80 90 100
TEMPERATURE (°C)
DETERMINISTIC JITTER vs. INPUT
COMMON-MODE VOLTAGE (VCC TO VCC - 0.8V)
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)
MAX3748 toc07
3.2Gbps, 223 - 1 PRBS, 5mVP-P
OUTPUT EYE DIAGRAM (MAXIMUM INPUT)
MAX3748 toc08
3.2Gbps, 223 - 1 PRBS, 1200mVP-P
OUTPUT EYE DIAGRAM (MINIMUM INPUT)
MAX3748 toc09
2.7Gbps, 223 - 1 PRBS, 5mVP-P
100mV/div
100mV/div
100mV/div
50ps/div
50ps/div
100ps/div
_______________________________________________________________________________________ 5