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DS1886_V1 Datasheet - Page 87

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A2h Table 04h, Register 80h–A7h: MODULATION or TXCTRL5 LUT
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
Open Loop and APC Loop (Modulation), Dual Closed Loop (TXCTRL5)
7
80h–A7h
2
The digital value for the modulation DAC output or TXCTRL5 register in MAX3710. The MODULATION LUT is a set
of registers assigned to hold the temperature profile for the MODULATION register. The temperature measurement
is used to index the LUT (TINDEX, A2h Table 02h, Register 81h) in 2NC increments from -40NC to +102NC, starting
at 80h. Values recalled from this EEPROM memory table are written into the MODULATION VALUE register (A2h
Table 02h, Register 82h–83h) location, which holds the value until the next temperature conversion. The part can
be placed into a manual mode (MOD LUT EN bit, A2h Table 02h, Register 80h), where MODULATION register is
directly controlled for calibration. If the temperature compensation functionality is not required, then program the
entire table to the desired modulation setting. See the BIAS, MODULATION, SET_2XAPC, TXCTRL5 LUTs section for
more details. The MODULATION VALUE written to the register is determined as follows:
A2h Table 04h, Register A8h–EFh: EMPTY
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
These registers are empty.
A2h Table 04h, Register F0h–F7h: MOD MAX LUT
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
8
F0h–F7h
2
BIT 7
SFP and PON ONU Controller
with Digital LDD Interface
00h
PW2 or (PW1 and RWTBL246) or (PW1 and RBL246)
PW2 or (PW1 and RWTBL246)
Nonvolatile (EE)
6
5
4
2
2
2
MODULATION VALUE = MODULATION LUT + 4 x MOD OFFSET LUT
N/A
N/A
00h
PW2 or (PW1 and RWTBL246) or (PW1 and RBL246)
PW2 or (PW1 and RWTBL246)
Nonvolatile (EE)
7
6
5
2
2
2
DS1886
A2h Table 04h Register Descriptions
3
2
1
2
2
2
4
3
2
2
2
2
0
2
1
2
BIT 0
87

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