ISL58831 Datasheet, PDF (4/12 Pages) Intersil Corporation – Dual Laser Driver with APC Amplifier and Spread Spectrum Oscillator

Pin Configuration
ISL58831
ISL58831
(24 LD QFN)
TOP VIEW
IIN2 1
RF1 2
IIN3 3
IIN4 4
RF2 5
WEN2 6
SEL1 7
THERMAL
PAD
19 VDDN
18 IOUT1
17 GND
16 SS_MON
15 IOUT2
14 RAMP1
13 RAMP2
Pin Descriptions
PIN
PIN
PIN
NUMBER NAME FUNCTION
PIN DESCRIPTION
1
IIN2
Analog Input pin for IIN2, which current is amplified and output to IOUT1 (add external series resistor when voltage driven).
2
RF1
Analog External resistor to ground sets the oscillator frequency when SEL1 = 1.
3
IIN3
Analog Input pin for IIN3, which current is amplified and output to IOUT1 (add external series resistor when voltage driven).
4
IIN4
Analog Input pin for IIN4, which current is amplified and output to IOUT1 (add external series resistor when voltage driven).
5
RF2
Analog External resistor to ground sets the oscillator frequency when SEL1 = 0.
6
WEN2
Digital WEN2 = 0 applies the current from the IIN2 amplifier to the IOUT pin.
7
SEL1
Digital If SEL1 = 1, IOUT1 and RFREQ1 and RAMP1 are selected, otherwise IOUT2 and RFREQ2 and RAMP2 are selected.
8
WEN3
Digital WEN3 = 0 applies the current from the IIN3 amplifier to the IOUT pin.
9
WEN4
Digital WEN4 = 0 applies the current from the IIN4 amplifier to the IOUT pin.
10 VDDQ Power Supply +5V supply for bias and amplifiers (connect all supplies).
11 OSCEN
Digital OSCEN = 1 powers up the oscillator and oscillator driver and passes specified oscillator current to I_OUT.
12 ENABLE Digital ENABLE = 1 powers up the chip, ENABLE = 0 puts the chip in power-down mode.
13 RAMP2 Analog External resistor to ground sets the oscillator amplitude when SEL1 = 0.
14 RAMP1 Analog External resistor to ground sets the oscillator amplitude when SEL1 = 1.
15
IOUT2
Analog Output current source for ROM laser diode at [82 * I_INR + I_OSC (ac)].
16 SS_MON Analog Modulation rate monitor.
17
GND Power Supply Ground (connect all grounds).
18
IOUT1
Analog Output current source for RW laser diode [100 * (1.65 * I_INR + 2.5 * I_IN2 + 2.0 * I_IN3 + I_IN4) + I_OSC (ac)].
19 VDDN Power Supply +5V supply for output drivers (connect all supplies).
20 VDDN Power Supply +5V supply for output drivers (connect all supplies).
21
PDIN
Analog Connect the photo diode to this pin for the I-V amplifier input; connect the gain resistor and compensation capacitor
between PDIN and VOUT.
22
VOUT
Analog Output voltage from I-V amplifier.
23
VREF
Analog Reference voltage for the I-V amplifier.
24
IINR
Analog Input pin for IINR (IINR2), which current is amplified and output to IOUT1 (IOUT2) (add external series resistor when
voltage driven).
PD Thermal Pad Should be connected to GND.
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FN7440.1
January 28, 2016