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MAX3747AEUB Datasheet(PDF) 9 Page - Maxim Integrated Products

Part # MAX3747AEUB
Description  155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX3747AEUB Datasheet(HTML) 9 Page - Maxim Integrated Products

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155Mbps to 3.2Gbps, Low-Power SFP
Limiting Amplifiers
_______________________________________________________________________________________
9
Loss-of-Signal Indicator
The MAX3747/MAX3747A are equipped with LOS cir-
cuitry that indicates when the input signal is below a pro-
grammable 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 VCC and the other connecting from TH
to VREF (Figure 5). An RMS power detector compares
the 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 programmed threshold, approximately 2dB of hys-
teresis 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.
Applications Information
Program the LOS Assert Threshold
Program the LOS assert threshold according to Figure
5. The combination of R1 and R2 should be greater
than or equal to 5k
Ω, see the Assert/Deassert vs. VTH
graph in the Typical Operating Characteristics.
Select the Coupling Capacitor
When AC-coupling is desired, coupling capacitors CIN
and COUT should be selected to minimize the receiv-
er’s deterministic jitter. Jitter is decreased as the input
low-frequency cutoff (fIN) is decreased:
fIN = 1 / [2
π(50)(CIN)]
For all applications, the recommended value for CIN and
COUT is 0.1µF, which provides fIN equal to 32kHz. Refer
to Application Note HFAN-1.1: Choosing AC-Coupling
Capacitors on the Maxim website (www.maxim-ic.com).
EMI Performance
The MAX3747/MAX3747A have been designed for bet-
ter EMI performance. To help reduce EMI, special care
has been taken to produce symmetrical signal outputs.
Chip Information
TRANSISTOR COUNT: 443
PROCESS: SiGe Bipolar
TH
VREF
R2
R1
VCC
VTH = (R1 x (VREF - VCC)) / (R2 + R1)
VTH IS VCC REFERENCED
R1 + R2
≥ 5kΩ
Figure 5. MAX3747/MAX3747A LOS Threshold Circuit
ESD
STRUCTURE
VCC
LOS
Figure 6. MAX3747/MAX3747A LOS Output Circuit
1
2
3
4
5
10
9
8
7
6
VCC
OUT+
OUT-
LOS
VREF
IN-
IN+
DISABLE
MAX3747
MAX3747A
µMAX
TOP VIEW
GND
TH
Pin Configuration


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