MAX3747_07 [MAXIM]

155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers; 155Mbps至3.2Gbps速率,低功耗SFP限幅放大器
MAX3747_07
型号: MAX3747_07
厂家: MAXIM INTEGRATED PRODUCTS    MAXIM INTEGRATED PRODUCTS
描述:

155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers
155Mbps至3.2Gbps速率,低功耗SFP限幅放大器

放大器
文件: 总10页 (文件大小:299K)
中文:  中文翻译
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19-3297; Rev 1; 10/07  
155Mbps to 3.2Gbps, Low-Power SFP  
Limiting Amplifiers  
/MAX347B  
General Description  
Features  
The MAX3747/MAX3747A/MAX3747B multirate limiting  
amplifiers function as data quantizers for OC-3 through  
OC-48 synchronous 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.  
Pin Compatible with Micrel SY88993V  
155Mbps to 3.2Gbps Operation  
> 57dB of Gain  
-
12  
< 10  
BER with 2mV  
Input Amplitude  
P-P  
18mA Supply Current  
Chatter-Free LOS with Programmable Threshold  
Output DISABLE Function  
The MAX3747 output voltage level is 500mV  
and the  
P-P  
MAX3747A/MAX3747B output voltages are 800mV  
.
P-P  
The MAX3747B has enhanced LOS operation under over-  
load conditions.  
PECL-Compatible Inputs  
The MAX3747/MAX3747A/MAX3747B limiting amplifiers  
feature a programmable loss-of-signal detect (LOS)  
and an optional disable function (DISABLE) that can be  
combined to implement squelch.  
Ordering Information  
PIN-  
PACKAGE  
PKG  
CODE  
PART  
TEMP RANGE  
The MAX3747/MAX3747A/MAX3747B are available in a  
3mm, 10-pin µMAX® package ideal for small form-  
factor receivers.  
MAX3747EUB  
MAX3747AEUB  
MAX3747BEUB  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
10 µMAX  
10 µMAX  
10 µMAX  
U10C-4  
U10C-4  
U10C-4  
Applications  
Gigabit Ethernet SFP/SFF Optical Transceiver Modules  
1G/2G Fibre-Channel SFP/SFF Optical Transceiver  
Modules  
µMAX is a registered trademark of Maxim Integrated Products, Inc.  
Multirate OC-3 to OC-48 FEC SFP/SFF Optical  
Transceiver Modules  
Pin Configuration appears at end of data sheet.  
10G LX4 Transceiver Modules  
Typical Application Circuit  
SFP OPTICAL RECEIVER  
HOST BOARD  
3-INPUT  
DIAGNOSTIC  
MONITOR  
SUPPLY FILTER  
HOST FILTER  
RX  
V
CC  
V
CC_  
DS1859  
MAX4004  
V
CC  
MAX3747  
MAX3747A  
MAX3747B  
0.1μF  
0.1μF  
0.1μF  
0.1μF  
IN+  
IN-  
OUT+  
OUT-  
50Ω  
SERDES  
MAX3745  
50Ω  
5-PIN TO-HEADER  
V
TH  
GND LOS DISABLE  
REF  
50Ω  
50Ω  
4.7kΩ TO 10kΩ  
V HOST  
CC_  
LOS  
R
R
TH1  
0.1μF  
0.1μF  
TH2  
R
TH1  
+ R 5kΩ  
TH2  
V
CC  
________________________________________________________________ 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.  
155Mbps to 3.2Gbps, Low-Power SFP  
Limiting Amplifiers  
ABSOLUTE MAXIMUM RATINGS  
Power-Supply Voltage (V ).................................-0.5V to +4.5V  
Continuous Current at CML Outputs  
CC  
Voltage at IN+, IN- ..........................(V  
- 2.4V) to (V  
+ 0.5V)  
+ 0.5V)  
(OUT+, OUT-) ..............................................-25mA to +25mA  
CC  
CC  
CC  
Voltage at DISABLE, LOS, TH, V  
..........-0.5V to (V  
Continuous Power Dissipation (T = +70°C)  
REF  
A
Current into LOS ...................................................-1mA to +9mA  
Current into V ..................................................................2mA  
Differential Input Voltage (IN+ - IN-) .....................................2.5V  
10-Pin µMAX (derate 6.9mW/°C above +70°C) ...........552mW  
Operating Junction Temperature Range (T ) .......-55°C to +150°C  
REF  
J
Storage Ambient Temperature Range (T )...........-55°C to +150°C  
S
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  
(V  
CC  
= +2.97V to +3.63V, CML output load is 50Ω to V , T = -40°C to +85°C. Typical values are at V  
= +3.3V and T = +25°C,  
CC A  
CC  
A
unless otherwise specified.) (Note 1)  
PARAMETER  
SYMBOL  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
POWER SUPPLY  
MAX3747 including the CML output current  
MAX3747A including the CML output current  
MAX3747B including the CML output current  
30  
36  
38  
35  
41  
43  
Supply Current (Note 2)  
I
mA  
dB  
CC  
MAX3747/MAX3747A excluding the CML  
output current  
18  
24  
26  
MAX3747B excluding the CML output  
current  
20  
30  
Power-Supply Noise Rejection  
INPUT SPECIFICATION  
Input Sensitivity  
PSNR  
f < 2MHz  
V
(Note 3)  
(Note 3)  
4
mV  
P-P  
IN-MIN  
Input Overload  
V
1200  
42  
mV  
P-P  
IN-MAX  
/MAX347B  
OUTPUT SPECIFICATION  
Output Resistance  
R
50  
15  
58  
OUT  
Differential Output Return Loss  
DUT is powered on, f < 3GHz  
MAX3747A/MAX3747B  
dB  
600  
400  
800  
500  
1000  
600  
15  
4mV  
V 1200mV  
IN P-P  
CML Differential Output Voltage  
mV  
P-P  
P-P  
MAX3747 4mV  
V 1200mV  
IN P-P  
P-P  
Differential Output Signal When  
Disabled  
AC-coupled outputs, V  
the input (Note 4)  
applied to  
IN-MAX  
mV  
P-P  
Data-Output Transition Time  
20% to 80% (Note 4)  
70  
120  
ps  
TRANSFER CHARACTERISTIC  
K28.5 pattern at 3.2Gbps  
23  
13.2  
14  
19  
25  
17  
150  
5
PRBS 2 - 1 equivalent pattern at 2.7Gbps  
(Note 6)  
Deterministic Jitter (Notes 4, 5)  
Random Jitter  
DJ  
ps  
P-P  
K28.5 pattern at 2.1Gbps  
12  
23  
PRBS 2 - 1 equivalent pattern at 155Mbps  
85  
(Note 6)  
V
= 4mV  
(Notes 4, 7)  
3.5  
ps  
RMS  
IN  
P-P  
2
_______________________________________________________________________________________  
155Mbps to 3.2Gbps, Low-Power SFP  
Limiting Amplifiers  
/MAX347B  
ELECTRICAL CHARACTERISTICS (continued)  
(V  
CC  
= +2.97V to +3.63V, CML output load is 50Ω to V , T = -40°C to +85°C. Typical values are at V  
= +3.3V and T = +25°C,  
CC A  
CC  
A
unless otherwise specified.) (Note 1)  
PARAMETER  
Input-Referred Noise  
Low-Frequency Cutoff  
LOS Hysteresis  
SYMBOL  
CONDITIONS  
MIN  
TYP  
120  
6.4  
MAX  
UNITS  
μV  
V
= 4mV  
(Note 4)  
150  
IN  
P-P  
RMS  
kHz  
10log(V  
/ V  
) (Note 4)  
ASSERT  
1.25  
2.3  
dB  
DEASSERT  
MAX3747/MAX3747A (Notes 4, 8)  
MAX3747B (Notes 4, 8, 9)  
LOS Assert/Deassert Time  
40.0  
μs  
Low LOS Assert Level  
Low LOS Deassert Level  
Medium LOS Assert Level  
Medium LOS Deassert Level  
High LOS Assert Level  
High LOS Deassert Level  
TTL/CMOS I/O  
V
TH  
V
TH  
V
TH  
V
TH  
V
TH  
V
TH  
= -1.3V (Notes 4, 10)  
= -1.3V (Notes 4, 10)  
= -0.68V (Notes 4, 10)  
= -0.68V (Notes 4, 10)  
= -0.114V (Notes 4, 10)  
= -0.114V (Notes 4, 10)  
2.5  
4.1  
6.2  
5.9  
9.3  
mV  
P-P  
P-P  
P-P  
P-P  
P-P  
P-P  
mV  
mV  
mV  
mV  
mV  
22.0  
36.0  
29.0  
44.8  
53.7  
86.0  
31.0  
57.0  
63.6  
115  
V
1.35  
-
V
1.3V  
-
V
1.19  
-
CC  
CC  
CC  
V
REF  
Voltage  
V
REF  
V
LOS Output High Voltage  
LOS Output Low Voltage  
DISABLE Input High  
V
R
R
= 4.7kto 10kto V  
= 4.7kto 10kto V  
(3V)  
2.4  
2.0  
V
V
OH  
LOS  
CC_HOST  
V
(3.6V)  
0.4  
OL  
LOS  
CC_HOST  
V
V
IH  
DISABLE Input Low  
V
0.8  
10  
V
IL  
DISABLE Input Current  
R
LOS  
= 4.7kto 10kto V  
μA  
CC_HOST  
Note 1: The data-input transition time is controlled by a 4th-order Bessel filter with f  
= 0.75 x 2.667GHz for all data rates of  
-3dB  
2.667Gbps and below. The f  
= 0.75 x 3.2GHz for a data rate of 3.2Gbps.  
-3db  
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.  
23  
Note 6: The PRBS 2 - 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  
and Signal_OFF as shown in Figure 2B.  
(see Figure 5).  
P-P  
Note 10: V is the voltage at pin 5 referenced to V  
TH  
CC  
_______________________________________________________________________________________  
3
155Mbps to 3.2Gbps, Low-Power SFP  
Limiting Amplifiers  
V
CC  
I
CC  
(SUPPLY  
CURRENT)  
I
OUT  
(CML OUTPUT  
CURRENT)  
50Ω  
50Ω  
MAX3747  
MAX3747A  
MAX3747B  
Figure 1. Power-Supply Current Measurement  
V
V
IN  
IN  
SIGNAL_ON = 1.2V (OVERLOAD)  
P-P  
SIGNAL_ON  
/MAX347B  
1dB  
6dB  
MAXIMUM DEASSERT LEVEL FOR A GIVEN V  
MAXIMUM DEASSERT LEVEL FOR A GIVEN R /R RATIO  
TH1 TH2  
TH  
MAXIMUM POWER-DETECT WINDOW  
MAXIMUM POWER-DETECT WINDOW  
6dB  
MINIMUM ASSERT LEVEL FOR A GIVEN V  
MINIMUM ASSERT LEVEL FOR A GIVEN R /R RATIO  
TH1 TH2  
TH  
SIGNAL_OFF  
SIGNAL_OFF  
0V  
TIME  
0V  
TIME  
Figure 2A. LOS Deassert Threshold—Set 1dB Below Receiver  
Sensitivity  
Figure 2B. LOS Deassert Threshold—Operating at Input  
Overload  
4
_______________________________________________________________________________________  
155Mbps to 3.2Gbps, Low-Power SFP  
Limiting Amplifiers  
/MAX347B  
Typical Operating Characteristics  
(V  
CC  
= +3.3V, T = +25°C, unless otherwise noted.)  
A
OUTPUT EYE DIAGRAM  
(MINIMUM INPUT)  
OUTPUT EYE DIAGRAM  
(MAXIMUM INPUT)  
OUTPUT EYE DIAGRAM  
(MINIMUM INPUT)  
MAX3747/MAX3747A/MAX3747B toc03  
MAX3747/MAX3747A/MAX3747B toc01  
MAX3747/MAX3747A/MAX3747B toc02  
23  
23  
23  
3.2Gbps, 2 - 1 PRBS, 4mV  
3.2Gbps, 2 - 1 PRBS, 1200mV  
2.7Gbps, 2 - 1 PRBS, 4mV  
P-P  
P-P  
P-P  
60mV/div  
60mV/div  
60mV/div  
50ps/div  
50ps/div  
70ps/div  
SUPPLY CURRENT vs. TEMPERATURE  
(EXCLUDES OUTPUT CURRENT)  
OUTPUT EYE DIAGRAM  
(MAXIMUM INPUT)  
°
MAX3747/MAX3747A/MAX3747B toc05  
OUTPUT EYE DIAGRAM AT +100 C  
MAX3747/MAX3747A/MAX3747B toc04  
50  
45  
40  
35  
30  
25  
20  
15  
10  
23  
2.125Gbps, CJTPAT, 50mV  
P-P  
2.7Gbps, 2 - 1 PRBS, 1200mV  
P-P  
60mV/div  
60mV/div  
80ps/div  
-40 -30 -20 -10  
0 10 20 30 40 50 60 70 80  
70ps/div  
°
TEMPERATURE ( C)  
TRANSFER FUNCTION  
(OUTPUT VOLTAGE vs. INPUT VOLTAGE)  
RANDOM JITTER vs. TEMPERATURE  
RANDOM JITTER vs. INPUT AMPLITUDE  
3.0  
2.7  
2.4  
2.1  
1.8  
1.5  
1.2  
0.9  
0.6  
5
4
3
2
1
0
1000  
900  
800  
700  
600  
500  
400  
300  
200  
100  
0
V
= 50mV , FREQ = 2.7Gbps  
P-P  
3.2Gbps  
IN  
MAX3747AMAX3747B  
MAX3747  
0.3  
0
-40 -30 -20 -10  
0 10 20 30 40 50 60 70 80  
1
10  
100  
1000  
10,000  
0
1
2
3
4
5
°
TEMPERATURE ( C)  
DIFFERENTIAL INPUT AMPLITUDE (mV  
)
DIFFERENTIAL INPUT (mV  
)
P-P  
P-P  
_______________________________________________________________________________________  
5
155Mbps to 3.2Gbps, Low-Power SFP  
Limiting Amplifiers  
Typical Operating Characteristics (continued)  
(V  
CC  
= +3.3V, T = +25°C, unless otherwise noted.)  
A
DETERMINISTIC JITTER  
vs. INPUT AMPLITUDE  
DETERMINISTIC JITTER  
vs. TEMPERATURE  
BIT-ERROR RATIO vs. INPUT VOLTAGE  
25  
20  
15  
10  
5
40  
35  
30  
25  
20  
15  
10  
5
3.2Gbps, K28.5 PATTERN  
FREQ = 3.2Gbps  
PATTERN = K28.5  
13,000  
MAXIM  
MAX3747  
12,000  
11,000  
10,000  
9000  
8000  
7000  
6000  
5000  
4000  
3000  
2000  
1000  
1
V
IN  
= 5mV  
P-P  
MICREL  
SY88993V  
V
IN  
= 500mV  
P-P  
0
0
0
1
2
3
4
5
6
7
8
9
10  
1
10  
100  
1000  
10,000  
-40 -30-20 -10  
0
10 20 30 40 50 60 70 80  
°
DIFFERENTIAL INPUT AMPLITUDE (mV  
)
DIFFERENTIAL INPUT AMPLITUDE (mV  
)
P-P  
TEMPERATURE ( C)  
P-P  
LOS ASSERT/DEASSERT TIMES vs. INPUT  
AMPLITUDE (LOW R /R SETTINGS)  
LOS ASSERT/DEASSERT TIMES vs. INPUT  
AMPLITUDE (HIGH R /R SETTINGS)  
ASSERT/DEASSERT vs. V  
TH  
TH1 TH2  
TH1 TH2  
40  
35  
30  
25  
20  
15  
10  
5
40  
35  
30  
25  
20  
15  
10  
5
120  
110  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
V (V) = VOLTAGE AT PIN 5 (V)  
TH  
MAX3747B  
MAX3747B  
WITH RESPECT TO V  
CC  
DEASSERT  
LOS ASSERT  
LOS DEASSERT  
LOS ASSERT  
LOS DEASSERT  
ASSERT  
/MAX347B  
0
0
0
200 400 600 800 1000 1200 1400  
INPUT AMPLITUDE (mV  
0
200 400 600 800 1000 1200 1400  
INPUT AMPLITUDE (mV  
-1.4 -1.2 -1.0 -0.8 -0.6 -0.4 -0.2  
(V)  
0
)
)
P-P  
V
TH  
P-P  
OUTPUT RETURN vs. FREQUENCY (SDD22)  
(INPUT SIGNAL LEVEL = -60dBm)  
INPUT RETURN vs. FREQUENCY (SDD11)  
(INPUT SIGNAL LEVEL = -60dBm)  
ASSERT/DEASSERT vs. TEMPERATURE  
40  
35  
30  
25  
20  
15  
10  
5
30  
20  
30  
20  
V
= -1.1V, FREQ = 2.7Gbps  
TH  
23  
PATTERN = PRBS 2 - 1  
10  
10  
0
0
DEASSERT  
ASSERT  
-10  
-20  
-30  
-10  
-20  
-30  
-40 -30 -20 -10  
0 10 20 30 40 50 60 70 80  
100  
1000  
10,000  
100  
1000  
10,000  
°
TEMPERATURE ( C)  
FREQUENCY (MHz)  
FREQUENCY (MHz)  
6
_______________________________________________________________________________________  
155Mbps to 3.2Gbps, Low-Power SFP  
Limiting Amplifiers  
/MAX347B  
Pin Description  
MAX3747/  
MAX3747A/  
MAX3747B  
MICREL  
SY8893V  
PIN  
FUNCTION  
NAME  
NAME  
Disable Function Pin. The data outputs are held static when this pin is asserted  
high, transistor-to-transistor logic (TTL). The data outputs are enabled when this pin  
is held low. LOS functions remain active when outputs are disabled. For normal  
operation connect to GND.  
1
DISABLE  
EN  
2
3
4
IN+  
IN-  
DIN  
Noninverted Input Signal  
DIN  
Inverted Input Signal  
V
REF  
V
REF  
Reference Voltage for LOS Threshold Setting  
Loss-of-Signal Level Set. A voltage on this pin created by a two-resistor divider sets  
the threshold level. Connect one resistor from this pin to V and another from this  
CC  
5
6
TH  
LOSLVL  
GND  
pin to V  
(see Figure 5).  
REF  
GND  
Ground  
Loss of Signal. Open collector for the MAX3747 and MAX3747A; internal 100k  
pullup to V for the MAX3747B. LOS is high when the level of the input signal  
CC  
drops below the preset threshold set by the TH input. LOS is deasserted low when  
the signal level is above the threshold.  
7
LOS  
LOS  
OUT-  
8
9
DOUT  
Inverted Data Output, CML  
Noninverted Data Output, CML  
Positive Power Supply  
OUT+  
DOUT  
10  
V
CC  
V
CC  
Detailed Description  
The limiting amplifiers consist of a multistage amplifier,  
offset-correction circuitry, an output buffer, and loss-of-  
signal detect circuitry (see the Functional Diagram).  
V
CC  
MAX3747  
MAX3747A  
MAX3747B  
Input Stage  
The input stage is shown in Figure 3. It provides 50Ω ter-  
mination to V  
for each input signal, IN+ and IN-. The  
REF  
MAX3747/MAX3747A/MAX3747B should be AC-coupled.  
ESD  
STRUCTURES  
Multistage Amplifier  
The high-bandwidth multistage amplifier provides  
approximately 57dB of gain for the MAX3747 and 61dB  
of gain for the MAX3747A/MAX3747B.  
Offset Correction Loop  
The MAX3747/MAX3747A/MAX3747B are susceptible to  
DC offsets in the signal path because they have high gain.  
In communication systems using NRZ data with a 50%  
duty cycle, pulse-width distortion present in the signal or  
generated in the transimpedance amplifier appears as an  
input offset and is reduced by the offset correction loop.  
50Ω  
50Ω  
V
REF  
Figure 3. Differential Input Stage  
The offset correction loop sets a low-frequency cutoff of  
3.2kHz.  
_______________________________________________________________________________________  
7
155Mbps to 3.2Gbps, Low-Power SFP  
Limiting Amplifiers  
Functional Diagram  
V
CC  
MAX3747  
MAX3747A  
MAX3747B  
50Ω  
50Ω  
DIGITAL  
OFFSET  
CORRECTION  
OUT+  
OUT-  
IN+  
IN-  
DISABLE  
50Ω  
50Ω  
V
REF  
V
SIGNAL DETECT  
TH LOS  
REF  
V
REF  
R
TH1  
R
TH2  
R
TH1  
+ R 5kΩ  
TH2  
V
CC  
/MAX347B  
CML Output Buffer  
V
CC  
The CML outputs of the MAX3747/MAX3747A/  
MAX3747B limiting amplifiers provide high tolerance to  
impedance mismatches and inductive connectors. The  
output current is approximately 10mA for the MAX3747  
and 16mA for the MAX3747A/MAX3747B. Connecting  
50Ω  
50Ω  
OUT+  
OUT-  
the DISABLE pin to V  
disables the output. If the LOS  
CC  
pin is connected to the DISABLE pin, the outputs OUT+  
and OUT- are at a static voltage (squelch) whenever  
the input signal level drops below the LOS threshold.  
The output buffer can be AC- or DC-coupled to the  
load (Figure 4).  
DISABLE  
DATA  
Q3 Q4  
Q1  
Q2  
ESD  
STRUCTURES  
The MAX3747 output is 500mV  
and the MAX3747A/  
P-P  
.
DISABLE  
DISABLE  
MAX3747B output is 800mV  
P-P  
Figure 4. CML Output Buffer  
8
_______________________________________________________________________________________  
155Mbps to 3.2Gbps, Low-Power SFP  
Limiting Amplifiers  
/MAX347B  
Loss-of-Signal Indicator  
Applications Information  
Program the LOS Assert Threshold  
Program the LOS assert threshold according to Figure  
The MAX3747/MAX3747A/MAX3747B are equipped with  
LOS circuitry that indicates when the input signal is below  
a programmable threshold, set by a voltage on the TH pin  
(see the Typical Operating Characteristics). The voltage  
on the TH pin is set by two resistors, one connecting from  
5. The combination of R  
and R  
should be  
TH2  
TH1  
greater than or equal to 5kΩ, see the Assert/Deassert  
vs. V graph in the Typical Operating Characteristics.  
TH  
the TH pin to V  
and the other connecting from TH to  
(Figure 5). An RMS power detector compares the  
CC  
V
REF  
Select the Coupling Capacitor  
input signal amplitude with this threshold and feeds the  
signal-detect information to the LOS output, which is open  
collector. To prevent LOS chatter in the region of the pro-  
grammed threshold, approximately 2dB of hysteresis is  
built into the LOS assert/deassert function. Once asserted,  
LOS is not deasserted until the input amplitude rises to the  
required level. Figure 6 shows the LOS output circuit.  
When AC-coupling is desired, coupling capacitors C  
IN  
and C  
should be selected to minimize the receiv-  
OUT  
er’s deterministic jitter. Jitter is decreased as the input  
low-frequency cutoff (f ) is decreased:  
IN  
f
IN  
= 1 / [2π(50)(C )]  
IN  
For all applications, the recommended value for C and  
IN  
C
OUT  
is 0.1µF, which provides f equal to 32kHz. Refer  
IN  
to Application Note HFAN-1.1: Choosing AC-Coupling  
Capacitors on the Maxim website (www.maxim-ic.com).  
V
CC  
R
R
TH2  
TH1  
TH  
V
REF  
V
= (R x (V - V )) / (R + R  
)
TH  
TH2  
REF  
CC  
TH1  
TH2  
V
IS V REFERENCED  
CC  
TH  
R
TH1  
+ R 5kΩ  
TH2  
Figure 5. MAX3747/MAX3747A/MAX3747B LOS Threshold  
Circuit  
V
CC  
*
LOS  
ESD  
STRUCTURE  
*100kΩ PULLUP (MAX3747B ONLY)  
Figure 6. MAX3747/MAX3747A/MAX3747B LOS Output Circuit  
_______________________________________________________________________________________  
9
155Mbps to 3.2Gbps, Low-Power SFP  
Limiting Amplifiers  
Pin Configuration  
Chip Information  
TRANSISTOR COUNT: 447  
PROCESS: SiGe Bipolar  
TOP VIEW  
DISABLE  
IN+  
1
2
3
4
5
10  
9
V
CC  
Package Information  
OUT+  
OUT-  
LOS  
For the latest package outline information, go to  
MAX3747  
MAX3747A  
MAX3747B  
IN-  
8
www.maxim-ic.com/packages.  
V
7
REF  
TH  
PACKAGE TYPE  
DOCUMENT NO.  
21-0061  
6
GND  
10 µMAX  
μMAX  
Revision History  
Pages changed at Rev 1: 1 to 10 (added MAX3747B)  
/MAX347B  
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.  
10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600  
© 2007 Maxim Integrated Products  
is a registered trademark of Maxim Integrated Products.  
SPRINGER  

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