DS1874T+ Maxim Integrated Products, DS1874T+ Datasheet - Page 86

• 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 07h, Register 80h–A3h: DAC1 LUT
SFP+ Controller with Digital LDD Interface
Table 07h, Register A4h–A7h: RESERVED
86
______________________________________________________________________________________
80h–A3h
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
The DAC1 LUT is a set of registers assigned to hold the PWM profile for DAC1. The values in this table
determine the set point for DAC1. 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 07h. Register 80h
defines the -40°C to -36°C DAC1 value, Register 81h defines -36°C to -32°C DAC1 value, and so on. Values
recalled from this EEPROM memory table are written into the DAC1 VALUE (Table 02h, Registers 84h–85h)
location, which holds the value until the next temperature conversion. The part can be placed into a manual
mode (DAC1 EN bit, Table 02h, Register 80h), where DAC1 can be directly controlled for calibration. If
temperature compensation is not required by the application, program the entire LUT to the desired DAC1 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 RWTBL78) and (PW1 and RTBL78)
PW2 or (PW1 and RWTBL78)
Nonvolatile (EE)
00h
PW2 or (PW1 and RWTBL78) or (PW1 and RTBL78)
PW2 or (PW1 and RWTBL78)
Nonvolatile (EE)
2
5
2
4
2
3
Table 07h Register Descriptions
2
2
2
1
BIT 0
2
0