DS1874T+ Maxim Integrated Products, DS1874T+ Datasheet - Page 87

• 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 08h, Register 80h–A3h: DAC2 LUT
Table 08h, Register A4h–A7h: RESERVED
Auxiliary Memory A0h, Register 00h–FFh: EEPROM
80h–A3h
00h–FFh
SFP+ Controller with Digital LDD Interface
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
The DAC2 LUT is set of registers assigned to hold the PWM profile for DAC2. The values in this table determine
the set point for DAC2. 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 08h. Register 80h defines the
-40°C to -36°C DAC2 value, Register 81h defines -36°C to -32°C DAC2 value, and so on. Values recalled from
this EEPROM memory table are written into the DAC2 VALUE (Table 02h, Registers 86h–87h) location that holds
the value until the next temperature conversion. The DS1874 can be placed into a manual mode (DAC2 EN bit,
Table 02h, Register 80h), where DAC2 can be directly controlled for calibration. If temperature compensation is
not required by the application, program the entire LUT to the desired DAC2 set point.
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
These registers are reserved.
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
Accessible with the slave address A0h.
BIT 7
BIT 7
______________________________________________________________________________________
2
2
7
7
2
2
6
6
00h
PW2 or (PW1 and RWTBL78) or (PW1 and RTBL78)
PW2 or (PW1 and RWTBL78)
Nonvolatile (EE)
00h
PW2 or (PW1 and WAUXA) or (PW1 and WAUXAU)
PW2 or (PW1 and WAUXA)
Nonvolatile (EE)
00h
PW2 or (PW1 and RWTBL78) or (PW1 and RTBL78)
PW2 or (PW1 and RWTBL78)
Nonvolatile (EE)
2
2
5
5
2
2
4
4
Auxiliary Memory A0h Register Descriptions
2
2
3
3
Table 08h Register Descriptions
2
2
2
2
2
2
1
1
BIT 0
BIT 0
2
2
0
0
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