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DS1876 Datasheet(PDF) 17 Page - Maxim Integrated Products

Part # DS1876
Description  SFP Controller with Dual LDD Interface
PDF  69 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS1876 Datasheet(HTML) 17 Page - Maxim Integrated Products

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______________________________________________________________________________________ 17
SFP Controller with Dual LDD Interface
Figure 7. 3-Bit (8-Position) Delta-Sigma Example
Figure 8. DAC OFFSET LUTs
When temperature controlled, the DACs are updated
after each temperature conversion.
The reference input, REFIN, is the supply voltage for the
output buffer of all four DACs. The voltage connected to
REFIN and its decoupling must be able to support the
edge rate requirements of the delta-sigma outputs. In
a typical application, a 0.1FF capacitor should be con-
nected between REFIN and ground.
O
1
2
3
4
5
6
7
DAC OFFSET LUTs (04h/06h)[A2h/B2h]
EIGHT REGISTERS PER DAC
0
255
511
767
1023
EACH OFFSET REGISTER CAN BE INDEPENDENTLY SET BETWEEN
0 AND 1020. 1020 = 4 x FFh. THIS EXAMPLE ILLUSTRATES POSITIVE
AND NEGATVE TEMPCO.
DAC
LUT
BITS
7:0
F8h
DAC
LUT
BITS
7:0
F9h
DAC
LUT
BITS
7:0
FAh
DAC
LUT
BITS
7:0
FBh
DAC
LUT
BITS
7:0
FCh
DAC
LUT
BITS
7:0
FDh
DAC
LUT
BITS
7:0
FEh
DAC
LUT
BITS
7:0
FFh
0
255
511
-40°C
-8°C
+8°C
+24°C +40°C +56°C +70°C +88°C +104°C
767
1023
EACH OFFSET REGISTER CAN BE INDEPENDENTLY
SET BETWEEN 0 AND 1020. 1020 = 4 x FFh. THIS
EXAMPLE ILLUSTRATES POSITIVE TEMPCO.
DAC
LUT
BITS
7:0
F8h
DAC
LUT
BITS
7:0
F9h
DAC
LUT
BITS
7:0
FAh
DAC
LUT
BITS
7:0
FBh
DAC
LUT
BITS
7:0
FCh
DAC
LUT
BITS
7:0
FDh
DAC
LUT
BITS
7:0
FEh
DAC
LUT
BITS
7:0
FFh
DAC OFFSET LUTs (04h/06h)[A2h/B2h]
EIGHT REGISTERS PER DAC
-40°C
-8°C
+8°C
+24°C +40°C +56°C +70°C +88°C +104°C



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