DS1874T+ Maxim Integrated Products, DS1874T+ Datasheet - Page 85

• Manufacturer Part Number: DS1874T+
• Description: IC CTLR SFP+ ANLG LDD 28-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Laser Diode Controllerr

Specifications of DS1874T+

• Number Of Channels: 1
• Voltage - Supply: 2.85 V ~ 3.9 V
• Current - Supply: 2.5mA
• Operating Temperature: -40°C ~ 95°C
• Package / Case: 28-WFQFN Exposed Pad
• Mounting Type: Surface Mount
• Number Of Outputs: 5
• Duty Cycle (max): 50 %
• Output Voltage: 0 V to 3.9 V
• Mounting Style: SMD/SMT
• Switching Frequency: 0 KHz to 400 KHz
• Operating Supply Voltage: 2.85 V to 3.9 V
• Supply Current: 2.5 mA to 10 mA
• Maximum Operating Temperature: + 95 C
• Fall Time: 300 ns
• Minimum Operating Temperature: - 40 C
• Rise Time: 300 ns
• Synchronous Pin: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 90-1874T+000

Table 06h, Register 80h–A3h: APC LUT
Table 06h, Register A4h–A7h: RESERVED
80h–A3h
SFP+ Controller with Digital LDD Interface
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
The APC LUT is a set of registers assigned to hold the temperature profile for the APC reference DAC. The
values in this table combined with the APC bits in the COMP RANGING register (Table 02h, Register B9h)
determine the set point for the APC loop. The temperature measurement is used to index the LUT (TINDEX, Table
02h, Register 81h) in 4°C increments from -40°C to +100°C, starting at Register 80h in Table 06h. Register 80h
defines the -40°C to -36°C APC reference value, Register 81h defines the -36°C to -32°C APC reference value,
and so on. Values recalled from this EEPROM memory table are written into the APC DAC (Table 02h, Register
CDh) location that holds the value until the next temperature conversion. The DS1874 can be placed into a
manual mode (APC EN bit, Table 02h, Register 80h), where the APC DAC can be directly controlled for
calibration. If TE temperature compensation is not required by the application, program the entire LUT to the
desired APC set point.
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
These registers are reserved.
BIT 7
______________________________________________________________________________________
2
7
2
6
00h
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
PW2 or (PW1 and RWTBL246)
Nonvolatile (EE)
00h
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
PW2 or (PW1 and RWTBL246)
Nonvolatile (EE)
2
5
2
4
2
3
Table 06h Register Descriptions
2
2
2
1
BIT 0
2
0
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