MAXIM MAX3274 User Manual
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General Description
The MAX3274 dual-rate Fibre Channel limiting amplifier
is optimized for use in dual-rate 2.125Gbps/1.0625Gbps
Fibre Channel optical receiver systems. An on-chip
selectable fourth-order Bessel Thompson filter offers
15dB (typ) of attenuation at 2GHz to suppress the relaxation oscillation (RO) found in legacy transmitters. The
amplifier accepts a wide range of input voltages and
provides constant-level output voltages with controlled
edge speeds. Receivers using the MAX3275/MAX3277
transimpedance amplifiers (TIA) and the MAX3274 dualrate limiting amplifier can meet the Fibre Channel receiver sensitivity optical modulation amplitude (OMA)
specification of 49mW
P-P
at 2.125Gbps and 31mW
P-P
at
1.0625Gbps. Additional features include a programmable threshold loss-of-signal (LOS) detector, output
squelch, and bandwidth select. The MAX3274 features
current-mode logic (CML) data outputs. The MAX3274 is
available in a 16-pin QFN package, making it ideal for
GBIC and small form-factor receiver modules.
Applications
Fibre Channel GBIC Optical Modules
Dual-Rate Fibre Channel SFF/SFP Optical
Modules
Features
♦ Dual-Rate 1.0625Gbps/2.125Gbps Operation
♦ On-Chip Selectable 4th-Order Filter
♦ Relaxation Oscillation Suppression of Legacy,
CD Laser-Based Transmitters
♦ Available in a 100Ω Output Termination
♦ Programmable Loss-of-Signal (LOS) Threshold
♦ Output Squelch Control
♦ Power-On Reset Minimizes Inrush Current
♦ 4mm
✕
4mm 16-Pin QFN Package
MAX3274
Dual-Rate Fibre Channel Limiting Amplifier
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
TIA
+3.3V
V
CC
RATE SELECT
DESERIALIZER
IN+
RX LOS
IN-
0.1µF
OUT+
OUT-
TH SQUELCH BWSELGND
LOSLOS
4.7kΩ TO 10kΩ
0.1µF
OPTICAL MODULE
RECEIVER SECTION
HOST
SERVER OR SWITCH
HOST V
CC
100Ω
OR 150Ω
+3.3V
MAX3274
0.1µF
0.1µF
MAX3275
Typical Operating Circuit
19-2375; Rev 1; 7/03
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.
Pin Configurations appear at end of data sheet.
MAX3274UGE 0°C to +85°C 16 QFN G1644-1
PART TEMP RANGE PIN-PACKAGE
PKG.
CODE
MAX3274
Dual-Rate Fibre Channel Limiting Amplifier
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= +3.0V to +3.6V, TA= 0°C to +85°C. Typical values are at VCC= +3.3V and TA= +25°C, unless otherwise noted.)
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.
Supply Voltage (VCC) ............................................-0.5V to +6.0V
Continuous CML Output Current
(OUT+, OUT-) ...............................................-25mA to +25mA
CML Input Voltage (IN+, IN-) .....................-0.5V to (V
CC
+ 0.5V)
Differential Input Voltage (IN+, IN-).....................................2V
P-P
TTL Input Voltage
(BWSEL, SQUELCH, TEST)....................-0.5V to (V
CC
+ 0.5V)
Voltage at TH ................................................-0.5V to V
CC
+ 0.5V
Current into TH...................................................................5.0mA
Open Collector (LOS, LOS)...................................-0.5V to +5.5V
Operating Ambient Temperature Range .............-40°C to +85°C
Storage Ambient Temperature Range...............-55°C to +100°C
1
Supply Current 78 99 mA
Data Rate
BWSEL Response Time (Note 2) 10 µs
Input Range V
Random Jitter
Total Jitter
LOS, LOS Transition Time 10% to 90% rise/fall time (Notes 2, 7) 5 350 ns
LOS, LOS Response Time Figure 1 (Note 2) 1 20 µs
LOS, LOS Hysteresis
LOS Assert (V
LOS Assert (V
Squelch Input Current 100 µA
Single-Ended Input Resistance R
Data Input VSWR f < 2GHz (Note 2) 2.5
Differential Output Resistance R
CML Output Voltage V
Data Output Levels SQUELCH = 1, VIN < V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
BWSEL = 0 1.0625
BWSEL = 1 2.125
-3dB, BWSEL = 0 (Note 1) 0.77 0.89 1.0
-15dB, BWSEL = 0 (Note 1) 2.0Small-Signal Bandwidth
-3dB, BWSEL = 1 (Note 1) 1.7
(Notes 2, 3) 10 1200 mV
IN
BWSEL = 0, 10mV ≤ input ≤ 20mV (Notes 2, 4) 44 60
BWS E L = 0, 20m V < i np ut ≤ 1200m V ( N otes 2, 4) 37 44Deterministic Jitter
BWS E L = 1, 10m V ≤ i np ut ≤ 1200m V ( N otes 2, 4) 10 20
BWSEL = 0 (Notes 2, 5) 5.1
BWSEL = 1 (Notes 2, 5) 2.8
BWSEL = 0 (Note 6) 117
BWSEL = 1 (Note 6) 49
20 ✕ log (V
DEASSERT/VASSERT
(Note 8)
= 30mV
V
TH
) Range 330Ω < RTH < 2.0kΩ (Notes 2, 8) 8 30 mV
LOS
) Error 330Ω < RTH < 2.0kΩ (Notes 2, 8) -30 +30 %
LOS
IN+, IN- to V
IN
OUT+ to OUT- (MAX3274) 80 100 120 Ω
OUT
SQUELCH = 0 (Note 4) 900 1200 1600
OUT
SQUELCH = 1, VIN < V
P-P
CC
), VTH = 6mV
P-P
28
(Notes 2, 8) 4 8
40 50 60 Ω
(Note 4) 30
TH
(Note 4) V
TH
CC
- 0.
V
CC
Gbps
GHz
P-P
ps
P-P
ps
RMS
ps
P-P
dB
mV
P-P
V
MAX3274
Dual-Rate Fibre Channel Limiting Amplifier
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VCC= +3.0V to +3.6V, TA= 0°C to +85°C. Typical values are at VCC= +3.3V and TA= +25°C, unless otherwise noted.)
Note 1: Measured with a ≤-50dBm input signal on a network analyzer.
Note 2: Specifications are guaranteed by design and characterization.
Note 3: Using 2
7
- 1 PRBS pattern. The input bandwidth is limited to 0.75 ✕(selected data rate) by a 4th-order Bessel Thompson filter.
Note 4: Using a K28.5 pattern at the selected bit rate. Measured differentially into a matched external load.
Note 5: Using a K28.7 or equivalent pattern at the selected bit rate. Measured over the entire input voltage range.
Note 6: Total jitter is estimated as TJ = DJ + 14 x RJ, where DJ is the peak-to-peak deterministic jitter, and RJ is the RMS random jitter.
Note 7: LOS (open collector) is connected to a +5.5V supply through a 4.7kΩ external resistor.
Note 8: Using K28.7 or equivalent pattern at selected bit rate.
Note 9: Total jitter, deterministic jitter, LOS hysteresis, LOS assert performance verified.
Data Output Edge Speed
LOS Current Sink
LOS Current Sink
LOS, LOS Output Low Voltage LOS, LOS sink current = 1mA 0.5 V
Supply Noise Tolerance
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
20% to 80%, BWSEL = 0 (Notes 2, 5) 170 220
20% to 80%, BWSEL = 1 (Notes 2, 5) 105 140
LOS asserted 1.0 mA
LOS not asserted, V
+5.5V
LOS not asserted 1.0 mA
LOS asserted, V
10kHz ≤ f < 1MHz (Note 9) 40
1MHz ≤ f < 50MHz (Note 9) 20
= 0, 4.7kΩ pullup to
CC
= 0, 4.7kΩ pullup to +5.5V 0 10 µA
CC
010µA
ps
mV
P-P
P-P
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