DIGITAL INTERFACE

Control Interface

The digital setting codes for the STLC60134S configuration are sent over a serial line (CTRLIN) using

the word clock (CLWD).

The data burst is composed of 16 bits from which the first bit is used as start bit (’0’), the three LSBs be-

ing used to identify the data contained in the 12 remaining bits. Test related data are overruled by the

normal settings if the TEST pin is low.

Table 22. Control Interface Bit Mapping

M

S

B

L

S

B

RX SETTINGS

b

1

5

b

1

4

b

1

3

b

1

2

b

1

1

b

1

0

b

9

b

8

b

7

b

6

b

5

b

4

b

3

b

2

b

1

b

0

0

x

0

0

0

External Gain Control GC1

(init = 0)

0

x

0

0

0

External Gain Control GC0

(init = 0)

0

0

0

0

0

Rx input selected = RXIN0, RXIP0

(init)

0

1

0

0

0

Rx input selected = RXIN1, RXIP1

0

0

0000

00

0

AGC RX Gain setting 0dB

(init)

0

0

0001

00

0

AGC RX Gain setting 1dB

0

x

x

x

x

x

0

0

0

AGC RX Gain setting XdB

0

1

1111

00

0

AGC RX Gain setting 31dB

0

0

0

0

0

0

Normal mode Filter selection see LTNT pin

(init)

0

0

1

0

0

0

In ATU-C conf, force HC2 for RX path, TX grounded

0

1

0

0

0

0

In ATU-C conf, force HC1 for RX path

0

1

1

0

0

0

Normal mode Filter selection see LTNT pin

b

1

5

b

1

4

b

1

3

b

1

2

b

1

1

b

1

0

b

9

b

8

b

7

b

6

b

5

b

4

b

3

b

2

b

1

b

0

TX SETTINGS

0

0

0

0

0

0

0

1

Transmit TX - AGC setting -15dB

(init)

0

0

0

0

1

0

0

1

Transmit TX - AGC setting -14dB

0

x

x

x

x

0

0

1

Transmit TX - AGC setting (X - 15) dB

0

1

1

1

1

0

0

1

Transmit TX - AGC setting 0dB

0

0000

00

1

Not used

(init)

0

0000

00

1

Not used

(init)

0

0000

00

1

Not used

(init)

0

0000

00

1

Not used

(init)

0

x

x

x

0

0

1

General Purpose Output (GPO) setting

(init = 000)

b

1

5

b

1

4

b

1

3

b

1

2

b

1

1

b

1

0

b

9

b

8

b

7

b

6

b

5

b

4

b

3

b

2

b

1

b

0

AFE SETTINGS

0

0

0

1

0

Normal Mode (Digital path)

(init)

0

1

0

1

0

Digital Loopback (digital TX to digital RX - DAC not used)

0

0

0

1

0

Normal Mode (Analog path)

0

1

0

1

0

Analog loopback (RXi to TXi - ADC not used)

0

0

0

1

0

VCO DAC disabled

0

1

0

1

0

VCO DAC enabled

(init)

0

0

0

1

0

HC filter enabled

(init)

0

1

0

1

0

HC filter enabled

1) After initialization, this bit has to be cleared (0) to make the device properly operate.

STLC60134S

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