Table 3. Pin Functions.

N.

Name

Function

PCB connection

Supply

ANALOG INTERFACE

24

VRAP

positive voltage reference ADC

Decoupling network AVDD3

25

VREF

ground reference ADC

Decoupling network AVDD3

26

VRAN

negative voltage reference ADC

Decoupling network AVDD3

31

TXP

pre driver output

Line driver input

AVDD4

32

TXN

pre driver output

Line driver input

AVDD4

38

AGND

virtual analog ground (AVDD/2 = 1.65V)

Decoupling network AVDD5

44

VCOC

VCODAC time constant capacitor

VCODAC cap.

AVDD5

45

GC0

External gain control output LSB

AVDD5

46

GC1

External gain control output MSB

AVDD5

47

RXN0

analog receive negative input Gain 0

Echo filter output

AVDD5

48

RXP0

analog receive positive input Gain 0

Echo filter output

AVDD5

49

RXN1

analog receive negative input Gain 1 (most sensitive input)

Echo filter output

AVDD5

50

RXP1

analog receive positive input Gain 1 (most sensitive input)

Echo filter output

AVDD5

53

IREF

current reference TX DAC/DACE

Decoupling network AVDD2

55

IVCO

current reference VCO DAC

VCO bias network

AVDD1

56

VCXO

VXCO control current

VCXO filter

AVDD1

59

XTALI

XTAL oscillator input pin

Crystal + varicap

AVDD1

60

XTALO

XTAL oscillator output pin

Crystal + varicap

AVDD1

DIGITAL INTERFACE

1

TX1

digital transmit input, parallel data

DVDD2

2

TX0

digital transmit input, parallel data

DVDD2

7

CTRLIN

serial data input (settings)

Async Interface

DVDD2

9

CLKM

master clock output, f = 35.328MHz

Load = CL<30pF

DVDD2

10

CLNIB

nibble clock output, f = 17.664MHz (OSR = 2) or ground (OSR = 4)

Load = CL<30pF

DVDD2

11

CLWD

word clock output, f = 8.832/4.416MHz

Load = CL<30pF

DVDD2

12

RX3

digital receive output, parallel data

Load = CL<30pF

DVDD2

13

RX2

digital receive output, parallel data

Load = CL<30pF

DVDD2

14

RX1

digital receive output, parallel data

Load = CL<30pF

DVDD2

15

RX0

digital receive output, parallel data

Load = CL<30pF

DVDD2

18

PDOWN

power down select, ”1” = power down

Power down input

DVDD2

19

LTNT

ATU-R / ATU-C select pin

mode MSB

VDD in ATU-C mode DVDD2

20

RESETN

reset pin (active low)

RC- reset

DVDD2

22

GP0

General purpose output 0 (on AVDD 1)

Echo filter output

AVDD

33

GP1

General purpose output 1 (on AVDD 1)

Echo filter output

AVDD

43

GP2

General purpose output 2 (on AVDD 1)

Echo filter output

AVDD

63

TX3

digital transmit input, parallel data

Load = CL<30pF

DVDD2

64

TX2

digital transmit input, parallel data

Load = CL<30pF

DVDD2

21

RES

RESERVED

Must be connected

to DVSS (input)

36,

37, 39,

40, 57

RES

RESERVED

Must be connected

to AVSS (input)

SUPPLY VOLTAGES

8

DVSS1

DVSS

16

DVDD1

Digital I/O supply voltage

DVDD

17

DVDD2

digital internal supply voltage

DVDD

23

AVSS3

AVSS

27

AVDD3

ADC supply voltage

AVDD

STLC60134S

4/22