Rainbow Electronics MAX3799 - Manual (Page 31)

MAX3799
1Gbps to 14Gbps, SFP+ Multirate Limiting
Amplifier and VCSEL Driver
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REGISTER
FUNCTION/
ADDRESS
REGISTER
NAME
NORMAL
MODE
SETUP
MODE
BIT
NUMBER
/TYPE
BIT NAME
DEFAULT
VALUE
NOTES
R RW 8 SET_IMOD[8] 0 MSB modulation DAC
R RW 7 SET_IMOD[7] 0
R RW 6 SET_IMOD[6] 0
R RW 5 SET_IMOD[5] 1
R RW 4 SET_IMOD[4] 0
R RW 3 SET_IMOD[3] 0
R RW 2 SET_IMOD[2] 1
R RW 1 SET_IMOD[1] 0
Modulation
Current Setting
Register
Address = H0x09
SET_IMOD
Accessible through
REG_ADDR = 12
0 SET_IMOD[0] 0 LSB modulation DAC
R RW 7 IMODMAX[7] 0 MSB modulation limit
R RW 6 IMODMAX[6] 0
R RW 5 IMODMAX[5] 1
R RW 4 IMODMAX[4] 1
R RW 3 IMODMAX[3] 0
R RW 2 IMODMAX[2] 0
R RW 1 IMODMAX[1] 0
Maximum
Modulation
Current Setting
Register
Address = H0x0A
IMODMAX
R RW 0 IMODMAX[0] 0 LSB modulation limit
R RW 7 IBIASMAX[7] 0 MSB bias limit
R RW 6 IBIASMAX[6] 0
R RW 5 IBIASMAX[5] 0
R RW 4 IBIASMAX[4] 1
R RW 3 IBIASMAX[3] 0
R RW 2 IBIASMAX[2] 0
R RW 1 IBIASMAX[1] 1
Maximum Bias
Current Setting
Register
Address = H0x0B
IBIASMAX
R RW 0 IBIASMAX[0] 0 LSB bias limit
R R 7 SET_IMOD[0] 0
LSB of SET_IMOD DAC
register address = H0x09
R R 6 X 0
R R 5 DE_INC 0
Deemphasis increment
0: no update, 1: SET_TXDE
updates
±1 LSB
RW RW 4 MODINC[4] 0
MSB MOD DAC two’s
complement
RW RW 3 MODINC[3] 0
RW RW 2 MODINC[2] 0
RW RW 1 MODINC[1] 0
Modulation
Current Increment
Setting Register
Address = H0x0C
MODINC
RW RW 0 MODINC[0] 0
LSB MOD DAC two’s
complement
Table 7. Register Summary (continued)