ISL58831 Datasheet, PDF (8/12 Pages) Intersil Corporation – Dual Laser Driver with APC Amplifier and Spread Spectrum Oscillator

Timing Diagram
ISL58831
ENA
OSEN
WEN2
WEN3
WEN4
t_en
t_r2
t_f2
t_on
t_off
t_dis
I_OUT1
FIGURE 3. TIMING DIAGRAM
Typical Performance Curves
7
60
6
55
5
50
4
45
3
40
2
35
1
250
350
450
550
650
FREQUENCY (MHz)
FIGURE 4. FREQUENCY CONTROL
30
200
300
400
500
600
FREQUENCY (MHz)
FIGURE 5. I_CC vs FREQUENCY (EXCLUDING I_OUT)
140
R_FREQ = 5kΩ
120
R_FREQ = 2.5kΩ
100
80
60
40
R_FREQ = 1.65kΩ
20
0
0
1
2
3
4
5
R_AMP (kΩ)
FIGURE 6. AMPLITUDE CONTROL
The ISL58831 oscillator frequency is controlled by the current
being sourced at the R_FREQ pin. For a typical part, Equation 1
(accurate to better than 5MHz at any frequency) should be used
to determine the frequency of operation:
FREQ_{MHz} = -5.9672  10^-10  R_{F3 REQ} +
1.5839  10^-5  R_{F2 REQ} – 0.1596  R_FREQ + 841.34
(EQ. 1)
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8
FN7440.1
January 28, 2016