Data Sheet

ADN4600

Rev. C | Page 19 of 28

High Current Setting and Output Level Shift

In low voltage applications, users must pay careful attention to

both the differential and common-mode signal levels (see Figure 30

and Table 13). Failure to understand the implications of signal

level and choice of ac or dc coupling will almost certainly lead

to transistor saturation and poor transmitter performance.

TxHeadroom

There is a TxHeadroom register (I2C Register Address 0x23)

that allows configuration of the individual transmitters for

extra headroom at the output for high current applications. The

bits in this register are active high (default). There is one bit for

each transmitter of the device (see Table 17). Setting this bit

high puts the respective transmitter in a configuration for extra

headroom, and setting this bit low does not provide extra

headroom.

VTTO

VH

VOCM

dVOCM

VOD

VL

VEE

VODPP = 2 × VOD

Figure 30. Simplified Output Voltage Levels Diagram

Signal Levels and Common-Mode Shift for DC- and AC-Coupled Outputs

Table 13. Signal Levels and Common-Mode Shift for DC- and AC-Coupled Outputs

Output Levels and Output Compliance

AC-Coupled Transmitter

DC-Coupled Transmitter

TxHeadroom = 0

TxHeadroom = 1

VOD

(mV)

ITOT

(mA)

VD

Peak

(mV)

PE

Boost

PE

(dB)

dVOCM

(mV)

VH

(V)

VL

(V)

VH

Peak

(V)

VL

Peak

(V)

dVOCM

(mV)

VH

(V)

VL

(V)

VH

Peak

(V)

VL

Peak

(V)

Min

VL

(V)

Max

VCC − VL

(V)

Min

VCC

(V)

Min

VL

(V)

Max

VCC − VL

(V)

Min

VCC (V)

VTTO and VCC = 3.3 V

200

8

200

1.00

0.00

200

3.2

3

3.2

3

100

3.3

3.1

3.3

3.1

2.225 1.1

1.8

2

1.2

2

200

12

300

1.50

3.52

300

3.1

2.9

3.15 2.85 150

3.25 3.05 3.3

3

2.225 1.1

1.8

2

1.2

2

200

16

400

2.00

6.02

400

3

2.8

3.1

2.7

200

3.2

3

3.3

2.9

2.225 1.1

1.8

2

1.2

2

200

20

500

2.50

7.96

500

2.9

2.7

3.05 2.55 250

3.15 2.95 3.3

2.8

2.225 1.1

1.8

2

1.2

2

200

24

600

3.00

9.54

600

2.8

2.6

3

2.4

300

3.1

2.9

3.3

2.7

2.225 1.1

1.8

2

1.2

2

200

28

700

3.50

10.88 700

2.7

2.5

2.95 2.25 350

3.05 2.85 3.3

2.6

2.225 1.1

1.9

2

1.2

2.2

200

32

800

4.00

12.04 800

2.6

2.4

2.9

2.1

400

3

2.8

3.3

2.5

2.225 1.1

1.9

2

1.2

2.2

300

12

300

1.00

0.00

300

3.15 2.85 3.15 2.85 150

3.3

3

3.3

3

2.225 1.1

1.8

2

1.2

2

300

16

400

1.33

2.50

400

3.05 2.75 3.1

2.7

200

3.25 2.95 3.3

2.9

2.225 1.1

1.8

2

1.2

2

300

20

500

1.67

4.44

500

2.95 2.65 3.05 2.55 250

3.2

2.9

3.3

2.8

2.225 1.1

1.8

2

1.2

2

300

24

600

2.00

6.02

600

2.85 2.55 3

2.4

300

3.15 2.85 3.3

2.7

2.225 1.1

1.8

2

1.2

2

300

28

700

2.33

7.36

700

2.75 2.45 2.95 2.25 350

3.1

2.8

3.3

2.6

2.225 1.1

1.8

2

1.2

2

300

32

800

2.67

8.52

800

2.65 2.35 2.9

2.1

400

3.05 2.75 3.3

2.5

2.225 1.1

1.9

2

1.2

2.2

300

36

900

3.00

9.54

900

2.55 2.25 2.85 1.95 450

3

2.7

3.3

2.4

2.225 1.1

1.9

2

1.2

2.2

400

16

400

1.00

0.00

400

3.1

2.7

3.1

2.7

200

3.3

2.9

3.3

2.9

2.225 1.1

1.8

2

1.2

2

400

20

500

1.25

1.94

500

3

2.6

3.05 2.55 250

3.25 2.85 3.3

2.8

2.225 1.1

1.8

2

1.2

2

400

24

600

1.50

3.52

600

2.9

2.5

3

2.4

300

3.2

2.8

3.3

2.7

2.225 1.1

1.8

2

1.2

2

400

28

700

1.75

4.86

700

2.8

2.4

2.95 2.25 350

3.15 2.75 3.3

2.6

2.225 1.1

1.8

2

1.2

2

400

32

800

2.00

6.02

800

2.7

2.3

2.9

2.1

400

3.1

2.7

3.3

2.5

2.225 1.1

1.8

2

1.2

2

400

36

900

2.25

7.04

900

2.6

2.2

2.85 1.95 450

3.05 2.65 3.3

2.4

2.225 1.1

1.9

2

1.2

2.2

400

40

1000 2.50

7.96

1000 2.5

2.1

2.8

1.8

500

3

2.6

3.3

2.3

2.225 1.1

1.9

2

1.2

2.2

600

24

600

1.00

0.00

600

3

2.4

3

2.4

300

3.3

2.7

3.3

2.7

2.1

1.1

1.9

2

1.2

2.2

600

28

700

1.17

1.34

700

2.9

2.3

2.95 2.25 350

3.25 2.65 3.3

2.6

2.225 1.1

1.9

2

1.2

2.2

600

32

800

1.33

2.50

800

2.8

2.2

2.9

2.1

400

3.2

2.6

3.3

2.5

2.225 1.1

1.9

2

1.2

2.2

600

36

900

1.50

3.52

900

2.7

2.1

2.85 1.95 450

3.15 2.55 3.3

2.4

2.225 1.1

1.9

2

1.2

2.2

600

40

1000 1.67

4.44

1000 2.6

2

2.8

1.8

500

3.1

2.5

3.3

2.3

2.225 1.1

1.9

2

1.2

2.2

600

44

1200 1.83

5.26

1100 2.5

1.9

2.75 1.65 550

3.05 2.45 3.3

2.2

2.1

1.1

1.9

2

1.2

2.2

600

48

1400 2.00

6.02

1200 2.4

1.8

2.7

1.5

600

3

2.4

3.3

2.1

2.1

1.1

1.9

2

1.2

2.2