DS1874T+ Maxim Integrated Products, DS1874T+ Datasheet - Page 67

• 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 02h, Register B9h: COMP RANGING
B9h
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
The upper nibble of this byte controls the full-scale range of the quick-trip monitoring for BIAS. The lower nibble of
this byte controls the full-scale range for the quick-trip monitoring of the APC reference as well as the closed-loop
monitoring of APC.
SFP+ Controller with Digital LDD Interface
RESERVED
BITS 6:4
BITS 2:0
BIT 7
BIT 7
BIT 3
______________________________________________________________________________________
RESERVED (Default = 0)
BIAS[2:0]: BIAS Full-Scale Ranging. 3-bit value to select the FS comparison voltage for BIAS found
on MON1. Default is 000b and creates an FS of 1.25V.
RESERVED (Default = 0)
APC[2:0]: APC Full-Scale Ranging. 3-bit value to select the FS comparison voltage for MON2 with
the APC. Default is 000b and creates an FS of 2.5V.
BIAS
BIAS[2:0]
APC[2:0]
2
000b
001b
010b
011b
100b
101b
110b
111b
000b
001b
010b
011b
100b
101b
110b
111b
00h
PW2
PW2
Nonvolatile (SEE)
BIAS
1
% of 1.25V
% of 2.50V
100.00
100.00
BIAS
80.04
66.73
50.10
40.12
33.46
28.70
25.13
80.04
66.73
50.10
40.12
33.46
28.70
25.13
0
RESERVED
FS Voltage
FS Voltage
1.0005
0.8341
0.6263
0.5015
0.4183
0.3588
0.3141
2.0010
1.6683
1.2525
1.0030
0.8365
0.7175
0.6283
1.250
2.500
APC
2
APC
1
APC
BIT 0
0
67