MAX3747AEUB+ Maxim Integrated Products, MAX3747AEUB+ Datasheet - Page 9

• Manufacturer Part Number: MAX3747AEUB+
• Description: IC AMP LIMITING SFP 10-UMAX
• Manufacturer: Maxim Integrated Products
• Type: Limiting Amplifierr

Specifications of MAX3747AEUB+

• Applications: Data Quantizer, Optical Receivers
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Input Voltage Range (max): 2 V
• Operating Supply Voltage: 3.3 V
• Supply Current: 36 mA (Typ) @ 3.3 V
• Operating Temperature Range: + 85 C
• Available Set Gain: 61 dB (Typ)
• Mounting Style: SMD/SMT
• Number Of Channels: 1
• Power Dissipation: 552 mW
• Amplifier Type: Low Power
• Supply Voltage Range: 2.97V To 3.63V
• Amplifier Case Style: µMAX
• No. Of Pins: 10
• Termination Type: SMD
• Rohs Compliant: Yes
• Filter Terminals: SMD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
the TH pin to V
V
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.
Figure 5. MAX3747/MAX3747A/MAX3747B LOS Threshold
Circuit
Figure 6. MAX3747/MAX3747A/MAX3747B LOS Output Circuit
REF
(Figure 5). An RMS power detector compares the
CC
R
R
V
TH2
TH1
TH
= (R
_______________________________________________________________________________________
V
and the other connecting from TH to
CC
TH2
V
TH
R
x (V
TH
V
IS V
TH1
REF
REF
Loss-of-Signal Indicator
V
CC
+ R
CC
155Mbps to 3.2Gbps, Low-Power SFP
- V
REFERENCED
TH2
*100kΩ PULLUP (MAX3747B ONLY)
*
CC
≥ 5kΩ
)) / (R
TH1
+ R
TH2
)
ESD
STRUCTURE
LOS
Program the LOS assert threshold according to Figure
5. The combination of R
greater than or equal to 5kΩ, see the Assert/Deassert
vs. V
When AC-coupling is desired, coupling capacitors C
and C
er’s deterministic jitter. Jitter is decreased as the input
low-frequency cutoff (f
For all applications, the recommended value for C
C
to Application Note HFAN-1.1: Choosing AC-Coupling
Capacitors on the Maxim website (www.maxim-ic.com) .
OUT
TH
is 0.1µF, which provides f
OUT
graph in the Typical Operating Characteristics .
Limiting Amplifiers
Program the LOS Assert Threshold
should be selected to minimize the receiv-
Applications Information
Select the Coupling Capacitor
f
IN
= 1 / [2π(50)(C
IN
) is decreased:
TH1
IN
and R
equal to 32kHz. Refer
IN
)]
TH2
should be
IN
and
IN
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