ISL58781 Datasheet, PDF (11/15 Pages) Intersil Corporation – Laser Diode Driver with Serial Control and Write Current DAC

ISL58781
Typical Performance Curves (Continued)
300
250
I_BLUE vs V_HEAD vs P_{MAX CO}
(Reg 1-21 = 88h) (VSO = 4.5V)
(R_SET = 620)
3FFh
200
300h
150
200h
100
50
100h
80h
00
1
2
3
4
5
V_HEADROOM (V)
FIGURE 3. I_BLUE WRITE CURRENT vs V_DS vs
I_{PMAX_BIAS}
40h
6
250
200
150
1.622mA
100
1.228mA
0.836mA
50
0mA
0.441mA
00
1
2
3
4
5
6
7
V_HEADROOM (V)
FIGURE 4. I_BLUE READ vs V_HEADROOM vs I_APC,
(REG 1-212 = 88h) (V_SO = 5.0V)
(R_SET = 620)
1200
R_FREQ = 4700
1000
800
600
CR0 - 6 = 0b
400
200
CR0 - 6 = 1b
0
0x00
0x40
0x80
0xC0
HFMFREQ CODE
FIGURE 5. HFM CONTROL
0xFF
1200
1000
800
R_FREQ = 3900
CR0 - 6 = 0b
600
400
200
0
0x00
0x40
0x80
0xC0
HFMFREQ CODE
FIGURE 6. HFM CONTROL; VSO = 4.5V;
TEMP = +125°C
0xFF
90
80
HFMON = 80
70 ^{HFMON = FF}
60
50
40
30 ₀
HFMON = 01 ^{HFMON = 40}
100 200 300 400 500 600 700 800 900 1G
CHCLK FREQ (MHz)
FIGURE 7. HFM OSCILLATOR CURRENT
CONSUMPTION
10
50mA + 30mA_P-P
1.0
50mA
0.1 _0.1
1M
10M
100M
FREQUENCY (Hz)
FIGURE 8. I_OUTx NOISE vs FREQUENCY
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FN6909.3
December 3, 2015