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1: 1

CODEC

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CODEC

V IN−

30.1 W

0.1 mF

1 mF

33 nF

Line:

100 W

30.1 W

0.1 mF

4.99 kW

4.99 kW

1.15 kW

0.1 mF

Line Power =

ADSL2: + 19.8 dBm

ADSL2+: + 20.4 dBm

ADSL2++: + 21.1 dBm

+12 V

−12 V

THS6184

SLLS635 – JANUARY 2005

DUAL-PORT, LOW-POWER DIFFERENTIAL

xDSL LINE DRIVER AMPLIFIERS

•

Trimmed Low-Power Consumption

The THS6184 is a dual-port, low-power current

feedback differential line driver amplifier system ideal

– 4.2-mA/amp Full Bias Mode ; 4.8 mA Max

for xDSL systems. Its extremely low-power dissi-

– 3.2-mA/amp Mid Bias Mode ; 3.7 mA Max

pation is ideal for ADSL, ADSL2, ADSL2+, and

– 2.15-mA/amp Low Bias Mode ; 2.5 mA Max

ADSL2++ systems that must achieve high densities in

ADSL central office rack applications by combining

two ports, or four amplifiers, into one package.

Bias

– Stable Down to 1.6-mA/amplifier

The unique architecture of the THS6184 allows the

trimmed quiescent current to be much lower than

•

Low Noise

existing line drivers while still achieving high linearity.

– 2.9-nV/

√Hz Voltage Noise

Distortion at these low-power levels is good with –73

– 5.7-pA/

√Hz Inverting Current Noise

dBc THD at 1 MHz with the low bias mode of 4.3

mA/port. Fixed and variable multiple-bias settings of

– 0.8-pA/

√Hz Noninverting Current Noise

the amplifiers allows for enhanced power savings for

•

Low MTPR Distortion

line lengths where the full performance of the ampli-

– –74 dB with ADSL and ADSL2

fier is not required.

– –71 dB with ADSL2+ and –70 dB with

The wide output swing of 44-Vpp differentially with

ADSL2++

±12-V power supplies coupled with over 410-mA

•

–83 dBc THD (1 MHz, 100-

Ω Differential)

current drive allow for wide dynamic headroom,

keeping distortion minimized. The THS6184 output

•

High Output Current: >410 mA (25-

Ω Load)

stage incorporates extra catch-diodes to the power

•

Wide Output Swing: 44 Vpp (

±12-V, 200-Ω

supply to minimize the external protection required in

Differential)

CO systems. With a low 2.9-nV/

√Hz voltage noise

•

Wide Bandwidth: 45 MHz (Gain = +5)

coupled with a low 5.7-pA/

√Hz inverting current noise,

the THS6184 increases the sensitivity of the receive

•

Wide Power Supply Range:

±2.25 V to ±16.5 V

signals allowing for better margins and reach.

•

Ideal For Power Sensitive, High Density ADSL,

ADSL2, ADSL2+, and ADSL2++ Systems

Figure 1. Typical Line Driver Circuit Using One Port of THS6184

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PowerPAD is a trademark of Texas Instruments.

PRODUCT PREVIEW information concerns products in the forma-

Copyright © 2005, Texas Instruments Incorporated

tive or design phase of development. Characteristic data and other

specifications are design goals. Texas Instruments reserves the

right to change or discontinue these products without notice.