3

ATR0841

4818AS–DVD–09/04

Pin Configuration

Figure 2. Pinning QFN24

RFB

RFA

E2

NE2

E3

NE3

IOUTA

GND

RSA

RSB

IOUTB

SELA

24 23 22 21 20 19

7 8

9 10 11 12

18

17

16

15

14

13

1

2

3

4

5

6

Pin Description

Pin

Symbol

Type

Function

1

RFB

Analog

External resistor to ground sets frequency of oscillator B

2

RFA

Analog

External resistor to ground sets frequency of oscillator A

3

E2

Digital

+LVDS control of channel 2

4

NE2

Digital

-LVDS control of channel 2

5

E3

Digital

+LVDS control of channel 3

6

NE3

Digital

-LVDS control of channel 3

7

E4

Digital

+LVDS control of channel 4

8

NE4

Digital

-LVDS control of channel 4

9

ENOSC

Digital

Enables RF oscillator (high active)

10

ENABLE

Digital

Enables output current (high active)

11

VCC

Supply

+5 V power supply

12

VCC

Supply

+5 V power supply

13

SELA

Digital

High: selects IOUTA, RSA, RFA

Low: selects IOUTB, RSB, RFB

14

IOUTB

Analog

Output current source B for laser diode

15

RSB

Analog

External resistor to ground sets swing of oscillator B

16

RSA

Analog

External resistor to ground sets swing of oscillator A

17

GND

Supply

Ground

18

IOUTA

Analog

Output current source A for laser diode

19

VCC

Supply

+5 V power supply

20

VCC

Supply

+5 V power supply

21

IR

Analog

Reference current input read channel (input impedance 500

Ω to ground)

22

I2

Analog

Reference current input channel 2 (input impedance 500

Ω to ground

23

I3

Analog

Reference current input channel 3 (input impedance 500

Ω to ground)

24

I4

Analog

Reference current input channel 4 (input impedance 500

Ω to ground)

Paddle

GND

Supply

Ground