ISL58831

4

FN7440.1

January 28, 2016

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Pin Configuration

ISL58831

(24 LD QFN)

TOP VIEW

19

18

17

16

15

14

13

1

2

3

4

5

6

7

IIN2

RF1

IIN3

IIN4

RF2

WEN2

SEL1

VDDN

IOUT1

GND

SS_MON

IOUT2

RAMP1

RAMP2

THERMAL

PAD

Pin Descriptions

PIN

NUMBER

PIN

NAME

PIN

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

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

16

SS_MON

Analog

Modulation rate monitor.

17

GND

Power Supply Ground (connect all grounds).

18

IOUT1

Analog

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.