AD8019AR-EVAL View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD8019AR-EVAL

DSL Line Driver with Power-Down

Analog Devices 

AD8019

Generating DMT Signals

4

At this time, DMT-modulated waveforms are not typically

menu-selectable items contained within arbitrary waveform

3

generators. Even using (AWG) software to generate DMT sig-

nals, AWGs that are available today may not deliver DMT

2

signals sufficient in performance with regard to MTPR due to

limitations in the D/A converters and output drivers used by

1

AWG manufacturers. Similar to evaluating single-tone distor-

tion performance of an amplifier, MTPR evaluation requires a

0

DMT signal generator capable of delivering MTPR performance

better than that of the driver under evaluation. Generating

–1

DMT signals can be accomplished using a Tektronics AWG

2021 equipped with Option 4, (12-/24-bit, TTL Digital Data

–2

Out), digitally coupled to Analog Devices’ AD9754, a 14-bit

TxDAC®, buffered by an AD8002 amplifier configured as a

differential driver. Note that the DMT waveforms, available on

the Analog Devices website, www.analog.com, or similar. WFM

files are needed to produce the necessary digital data required to

E drive the TxDAC from the optional TTL Digital Data output of

the TEK AWG2021.

+12V

–3

–0.25 –0.20 –0.15 –0.10 –0.05 0

0.05 0.10 0.15 0.20

TIME – ms

Figure 5. DMT Signal in the Time Domain

T 0.1␮F

100⍀

0.1␮F

10␮F

10k⍀

E 6V

VIN

0.1␮F

L 0.1␮F

10k⍀

O 0.1␮F

100⍀

301⍀

50⍀

50⍀

301⍀

R1

17.3⍀

POUT

16dBm

R2

17.3⍀

RL = 100⍀ LINE

POWER

13dBm

1:1.7

TRANSFORMER

Figure 6. Recommended Application Circuit for Single +12 V Supply

BS 0.1␮F

100⍀

O10k⍀

+12V

0.1␮F

10␮F

301⍀

R1

12.4⍀

50⍀

VIN

0.1␮F

POUT

16dBm

50⍀

RL = 100⍀ LINE

POWER

13dBm

10k⍀

301⍀

R2

12.4⍀

0.1␮F

100⍀

1:1

TRANSFORMER

–12V

0.1␮F

10␮F

Figure 7. Recommended Application Circuit for ±12 V Supply

TxDAC is a registered trademark of Analog Devices, Inc.

–14–

REV. 0

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