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MAX3946_10 データシートの表示(PDF) - Maxim Integrated

部品番号コンポーネント説明メーカー
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
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1.0625Gbps to 11.3Gbps, SFP+ Laser Driver
with Laser Impedance Mismatch Tolerance
Bit #
Name
Default Value
Modulation Current Setting Register (SET_IMOD)
7
6
5
4
3
2
1
0
ADDRESS
SET_IMOD SET_IMOD SET_IMOD SET_IMOD SET_IMOD SET_IMOD SET_IMOD SET_IMOD
[8] (MSB)
[7]
[6]
[5]
[4]
[3]
[2]
[1]
H0x09
0
0
0
0
0
1
0
0
Bits 7 to 0: SET_IMOD[8:1]. The modulation current DAC is controlled by a total of 9 bits. The SET_IMOD[8:1] bits
are used to set the modulation current with even denominations from 0 to 510 bits. The LSB (SET_IMOD[0]) is con-
trolled by the MODINC register and is used to set the odd denominations in the SET_IMOD[8:0]. Any direct write to
SET_IMOD[8:1] resets the LSB.
Bit #
Name
Default Value
Maximum Modulation Current Setting Register (IMODMAX)
7
6
5
4
3
2
1
0
ADDRESS
IMODMAX IMODMAX IMODMAX IMODMAX IMODMAX IMODMAX IMODMAX IMODMAX
[7] (MSB)
[6]
[5]
[4]
[3]
[2]
[1]
[0] (LSB)
H0x0A
0
0
1
0
0
0
0
0
Bits 7 to 0: IMODMAX[7:0]. The IMODMAX register is an 8-bit register that can be used to limit the maximum modula-
tion current. IMODMAX[7:0] is continuously compared to SET_IMOD[8:1]. Any attempt to modify SET_IMOD[8:1] above
IMODMAX[7:0] is ignored and flags a warning at IMODERR.
Bit #
Name
Default Value
Maximum Bias Current Setting Register (IBIASMAX)
7
IBIASMAX
[7] (MSB)
0
6
IBIASMAX
[6]
0
5
IBIASMAX
[5]
1
4
IBIASMAX
[4]
0
3
IBIASMAX
[3]
0
2
IBIASMAX
[2]
0
1
IBIASMAX
[1]
0
0
IBIASMAX
[0] (LSB)
0
ADDRESS
H0x0B
Bits 7 to 0: IBIASMAX[7:0]. The IBIASMAX register is an 8-bit register that can be used to limit the maximum bias
current. IBIASMAX[7:0] is continuously compared to SET_IBIAS[8:1]. Any attempt to modify SET_IBIAS[8:1] above
IBIASMAX[7:0] is ignored and flags a warning at IBIASERR.
Bit #
7
6
Name
SET_IMOD
[0] (LSB)
X
Default Value
0
0
Modulation Current Increment Setting Register (MODINC)
5
4
3
2
1
0
ADDRESS
MODINC MODINC MODINC MODINC MODINC
X
[4] (MSB)
[3]
[2]
[1]
[0] (LSB) H0x0C
0
0
0
0
0
0
Bit 7: SET_IMOD[0]. This is the LSB of the SET_IMOD[8:0] bits. This bit can only be updated by the use of MODINC[4:0].
Bits 4 to 0: MODINC[4:0]. This string of bits is used to increment or decrement the modulation current. When written
to, the SET_IMOD[8:0] bits are updated. MODINC[4:0] are a two’s complement string.
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