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MAX3946_10 데이터 시트보기 (PDF) - Maxim Integrated

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MAX3946_10 1.0625Gbps to 11.3Gbps, SFP+ Laser Driver with Laser Impedance Mismatch Tolerance MaximIC
Maxim Integrated MaximIC
MAX3946_10 Datasheet PDF : 28 Pages
First Prev 21 22 23 24 25 26 27 28
1.0625Gbps to 11.3Gbps, SFP+ Laser Driver
with Laser Impedance Mismatch Tolerance
Programming Pulse-Width Control
The eye crossing at the Tx output can be adjusted using
the SET_PWCTRL register. Table 5 shows these set-
tings. The sign of the number specifies the direction of
pulse-width distortion. The code of 1111 corresponds to
a balanced state for differential output. The pulse-width
distortion is bidirectional around the balanced state (see
the Typical Operating Characteristics section).
Table 5. Eye-Crossing Settings for
SET_PWCTRL
SET_PWCTRL[3:0]
1000
1001
1010
1011
1100
1101
1110
1111
PWD
-7
-6
-5
-4
-3
-2
-1
0
SET_PWCTRL[3:0]
0111
0110
0101
0100
0011
0010
0001
0000
PWD
8
7
6
5
4
3
2
1
Applications Information
Laser Safety and IEC 825
Using the MAX3946 laser driver alone does not ensure
that a transmitter design is compliant with IEC 825. The
entire transmitter circuit and component selections must
be considered. Each user must determine the level of
fault tolerance required by the application, recognizing
that Maxim products are neither designed nor authorized
for use as components in systems intended for surgical
implant into the body, for applications intended to sup-
port or sustain life, or for any other application in which
the failure of a Maxim product could create a situation
where personal injury or death could occur.
Table 6. Register Summary
REGISTER
FUNCTION/
ADDRESS
REGISTER
NAME
NORMAL
MODE
R
R
SETUP
MODE
RW
RW
BIT
NUMBER/
TYPE
5
4
Transmitter
R
RW
3
Control Register
Address =
TXCTRL
R
RW
2
H0x05
R
RW
1
R
RW
0
R
R
7 (sticky)
R
R
6 (sticky)
R
Transmitter
Status Register 1
Address =
TXSTAT1
R
H0x06
R
R
R
4 (sticky)
R
3 (sticky)
R
2 (sticky)
R
1 (sticky)
R
R
0 (sticky)
BIT NAME
TXDE_MD[1]
TXDE_MD[0]
TXEQ_EN
SOFTRES
TX_POL
TX_EN
FST[7]
FST[6]
FST[4]
FST[3]
FST[2]
FST[1]
TX_FAULT
DEFAULT
VALUE
NOTES
0
MSB deemphasis mode
0
LSB deemphasis mode
0
Input equalization
0: disabled, 1: enabled
0
Global digital reset
1
Tx polarity
0: inverse, 1: normal
1
Tx control
0: disabled, 1: enabled
X
TX_PORàTX_VCC low-
limit violation
X
BMON open/shorted to
VCC
X
BMAX current exceeded
or open/short to ground
X
VTOUT+/- common-mode
low-limit
X
VTOUT+/- low-limit violation
X
BIAS open or shorted to
ground
Copy of FAULT signal
X
in case POR bits 6 to 1
reset to 0
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