MAX3645 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – +2.97V to +5.5V, 125Mbps to 200Mbps Limiting Amplifier with Loss-of-Signal Detector

19-3026; Rev 0; 10/03
+2.97V to +5.5V, 125Mbps to 200Mbps Limiting
Amplifier with Loss-of-Signal Detector
General Description
The MAX3645 limiting amplifier functions as a data
quantizer and is pin compatible with the Mindspeed
MC2045-2 and MC2045-2Y postamplifiers. The amplifi-
er accepts a wide range of input voltages and provides
constant-level positive emitter-coupled logic (PECL)
output voltages with controlled edge speeds.
The MAX3645 features an integrated power detector
with complementary PECL loss-of-signal (LOS) outputs
that indicate when the input power level drops below a
programmable threshold. An optional squelch function
holds the data outputs at static levels during a
LOS condition.
The MAX3645 operates from a single +3.3V or +5.0V
power supply over a -40°C to +85°C temperature
range. It is available in 16-pin SO and 16-pin QSOP
packages.
Applications
SONET 155Mbps Transceivers
Fast Ethernet Receivers
FDDI 125Mbps Receivers
FTTx Receivers
ESCON Receivers
Features
o Pin Compatible with the Mindspeed
MC2045-2/MC2045-2Y
o 500µV Input Sensitivity (BER = 10^-12)
o Compatible with 4B/5B Data Coding
o Programmable LOS Threshold
o Stable LOS Threshold Over Supply Range
o Output Disable Function and Automatic Squelch
o Single +3.3V or +5.0V Power Supply
o 18mA Supply Current
Ordering Information
PART
MAX3645ESE
MAX3645EEE
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 SO
16 QSOP
Pin Configuration
TOP VIEW
CAZ2 ₁
CAZ1 2
GNDA 3
DIN+ 4
DIN- 5
V_CCA 6
CSD 7
DIS 8
MAX3645
16 TH
15 N.C.
14 V_CCE
13 DOUT+
12 DOUT-
11 GNDE
10 LOS
9 LOS
SO/QSOP
Typical Application Circuit
V_CC
V_CC
PIN K
MAX3644*
IN
GND
*FUTURE PRODUCT
OUT+
OUT-
0.1µF
0.1µF
V_CC
C_AZ
V_CC
0.1µF
C_SD
1nF
CSD ^VCCA CAZ1 CAZ2 ^VCCE
N.C.
DIN+
DOUT+
DIN-
GNDA
MAX3645
TH DIS LOS
DOUT-
LOS
GNDE
R_TH
100Ω
50Ω
V_CC - 2V
50Ω
50Ω
50Ω
V_CC - 2V
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