3

4851BS–DVD–06/05

ATR0849

2.

Pin Configuration

Figure 2-1.

Pinning QFN24

RFB

RFA

NER

E2

NE2

E3

IOUTA

RSB

GND

RSA

IOUTB

ENABLE

18

17

16

15

14

13

1

2

3

4

5

6

24 23 22 21 20 19

78

9 10 11 12

Table 2-1.

Pin Description

Pin

Symbol

Type

Function

1

RFB

Analog

External resistor to GND sets frequency of oscillator B

2

RFA

Analog

External resistor to GND sets frequency of oscillator A

3

NER

Digital

Digital control of read channel (channel 1), active low

4

E2

Digital

Digital control of channel 2

5

NE2

Digital

Digital control of channel 2

6

E3

Digital

Digital control of channel 3

7

NE3

Digital

Digital control of channel 3

8

E4

Digital

Digital control of channel 4

9

NE4

Digital

Digital control of channel 4

10

ENOSC

Digital

Digital control of RF oscillator

11

VCC

Supply

+5V power supply

12

VCC

Supply

+5V power supply

13

ENABLE

Digital

Enables output current, active high

14

IOUTB

Analog

Output current source B for laser diode

15

RSA

Analog

External resistor to GND sets swing of oscillator A

16

GND

Supply

Ground, power supply

17

RSB

Analog

External resistor to GND sets swing of oscillator B

18

IOUTA

Analog

Output current source A for laser diode

19

SELA

Digital

High: selects IOUTA, RSA, RFA

Low: selects IOUTB, RSB, RFB

20

VCC

Supply

+5V power supply

21

IR

Analog

Input current, bias voltage approximately GND

22

I2

Analog

Input current, bias voltage approximately GND

23

I3

Analog

Input current, bias voltage approximately GND

24

I4

Analog

Input current, bias voltage approximately GND

Paddle

GND

Supply

Ground, negative power supply