MAX3747EUB+T Maxim Integrated Products, MAX3747EUB+T Datasheet - Page 7

• Manufacturer Part Number: MAX3747EUB+T
• Description: IC AMP LIMITING SFP 10-UMAX
• Manufacturer: Maxim Integrated Products
• Type: Limiting Amplifierr

Specifications of MAX3747EUB+T

• Applications: Data Quantizer, Optical Receivers
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The limiting amplifiers consist of a multistage amplifier,
offset-correction circuitry, an output buffer, and loss-of-
signal detect circuitry (see the Functional Diagram ).
The input stage is shown in Figure 3. It provides 50Ω ter-
mination to V
MAX3747/MAX3747A/MAX3747B should be AC-coupled.
The high-bandwidth multistage amplifier provides
approximately 57dB of gain for the MAX3747 and 61dB
of gain for the MAX3747A/MAX3747B.
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.
The offset correction loop sets a low-frequency cutoff of
3.2kHz.
PIN
10
1
2
3
4
5
6
7
8
9
REF
MAX3747A/
MAX3747B
MAX3747/
DISABLE
NAME
OUT+
for each input signal, IN+ and IN-. The
OUT-
V
GND
LOS
IN+
V
_______________________________________________________________________________________
IN-
TH
REF
CC
Detailed Description
155Mbps to 3.2Gbps, Low-Power SFP
Offset Correction Loop
SY8893V
MICREL
LOSLVL
Multistage Amplifier
NAME
DOUT
DOUT
V
GND
LOS
DIN
V
DIN
EN
REF
CC
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.
Noninverted Input Signal
Inverted Input Signal
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
pin to V
Ground
Loss of Signal. Open collector for the MAX3747 and MAX3747A; internal 100k
pullup to V
drops below the preset threshold set by the TH input. LOS is deasserted low when
the signal level is above the threshold.
Inverted Data Output, CML
Noninverted Data Output, CML
Positive Power Supply
Input Stage
REF
CC
(see Figure 5).
for the MAX3747B. LOS is high when the level of the input signal
Figure 3. Differential Input Stage
STRUCTURES
50Ω
Limiting Amplifiers
ESD
50Ω
FUNCTION
V
REF
MAX3747A
MAX3747B
MAX3747
Pin Description
CC
and another from this
V
CC
7