ISL58792 Datasheet, PDF (12/16 Pages) Intersil Corporation – Laser Diode Driver with Serial Control and Write Current DAC

ISL58792
Typical Performance Curves (Continued)
300
250
I_BLUE vs V_HEAD vs P_{MAX CODE}
(Reg 1-21 = 88h) (VSO = 4.5V)
(R_SET = 620)
3FFh
200
300h
150
200h
100
50
100h
80h
00
1
2
3
4
40h
5
6
V_HEADROOM (V)
FIGURE 3. I_BLUE WRITE CURRENT vs V_HEADROOM vs PMAX
250
200
150
1.622mA
100
1.228mA
0.836mA
50
0mA
0.441mA
0
0
1
2
3
4
5
6
7
V_HEADROOM (V)
FIGURE 4. I_BLUE READ vs V_HEADROOM vs I_APC,
(REG 1-21 = 88h) (V_SO = 5.0V), (R_SET = 620)
1400
1200
R_FREQ = 3900
TEMP = +25°C
1000
800
TEMP = +125°C
600
VSO = 5.0V
400
CR0 - Bit6 = 0
200
0
32 64 96 128 160 192 224 256
HFM DAC (dec)
FIGURE 5. HFM CONTROL vs TEMPERATURES
1400
1200
1000
CR0 - bit6 = 0
HFMFREQUENCY, INT RFREQ, MHz (COUNTER)
800
R_FREQ = 4700
600
400
200
0
0
32 64 96 128 160 192 224 256
HFM DAC (dec)
FIGURE 6. HFM CONTROL; VSO = 5.0V
90
80
HFMON = 80
70
HFMON = FF
60
50
40
HFMON = 01
HFMON = 40
30 _{0 100 200 300 400 500 600 700 800 900 1G}
HFM FREQ (Hz)
FIGURE 7. HFM OSCILLATOR CURRENT CONSUMPTION
3.0
2.5
00h TO 78h
2.0
80h TO F0h
1.5
1.0
0.5
80h TO F8h ATE
0.0
-0.5
-1.0 _{HFMFreq = 400MHz}
-1.5
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
SS SETTING (DEC)
FIGURE 8. I_BLUE SS SHIFT vs SS SETTING @ 400MHz
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FN7580.3
December 14, 2015