AD8153_15 datasheet(21/24 Pages) AD | Single Buffered Mux/Demux Switch

Part No.	AD8153

Description	Single Buffered Mux/Demux Switch

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Manufacturer	AD [Analog Devices]

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AD8153

Rev. 0 | Page 21 of 24

OUTPUT COMPLIANCE

Figure 40 is a graphical depiction of the single-ended waveform

at the output of the AD8153. The common-mode level (VOCM)

and the amplitude (VOSE) of this waveform are a function of the

output tail current (IT), the output termination supply voltage

(VTTO), the topology of the far-end receiver, and whether ac- or

dc-coupling is used. Keep in mind that the output tail current

varies with the pre-emphasis level. The user must ensure that

the high (VH) and low (VL) voltage excursions at the output are

within the single-ended absolute voltage range limits as

specified in Table 1. Failure to understand the implications of

output signal levels and the choice of ac- or dc-coupling may

lead to transistor saturation and poor transmitter performance.

Table 9 shows an example calculation of the output levels for the

typical case, where VCC = VTTO = 3.3 V, with 50 Ω far-end

terminations to a 3.3 V supply.

VOCM

VH

VL

VOSE-DC VOSE-BOOST

VTTO

~320ps

Figure 40. Single-Ended Output Waveform

Table 9. Output Voltage Levels

DC-Coupled

AC-Coupled

PE Setting

IT (mA)

VOSE-DC (mV p-p)

VOSE-BOOST (mV p-p)

VOCM (V)

VH (V)

VL (V)

VOCM (V)

VH (V)

VL (V)

0

16

400

3.1

3.3

2.9

3.1

2.7

1

20

400

500

3.05

3.3

2.8

3.05

2.55

2

24

400

600

3

3.3

2.7

3

2.4

3

28

400

700

2.95

3.3

2.6

2.95

2.25

Table 10. Symbol Definitions

Symbol

Formula

Definition

VOSE-DC

Ω

×

=

25

0

PE

T

I

Single-ended output voltage swing after settling

VOSE-BOOST

Ω

×25

T

I

Boosted single-ended output voltage swing

VOCM (dc-coupled)

Ω

×

−

25

2

T

TTO

I

V

Common-mode voltage when the output is dc-coupled

VOCM (ac-coupled)

Ω

×

−

50

2

T

TTO

I

V

Common-mode voltage when the output is ac-coupled

VH

VOCM + VOSE-BOOST/2

High single-ended output voltage excursion

VL

VOCM - VOSE-BOOST/2

Low single-ended output voltage excursion

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