THS6184 Datasheet, PDF (1/4 Pages) Texas Instruments – DUAL-PORT, LOW-POWER DIFFERENTIAL xDSL LINE DRIVER AMPLIFIERS

THS6184
www.ti.com
DUAL-PORT, LOW-POWER DIFFERENTIAL
xDSL LINE DRIVER AMPLIFIERS
SLLS635 – JANUARY 2005
FEATURES
• Trimmed Low-Power Consumption
– 4.2-mA/amp Full Bias Mode ; 4.8 mA Max
– 3.2-mA/amp Mid Bias Mode ; 3.7 mA Max
– 2.15-mA/amp Low Bias Mode ; 2.5 mA Max
– Shutdown Mode and I_ADJ Pin for Variable
Bias
– Stable Down to 1.6-mA/amplifier
• Low Noise
– 2.9-nV/√Hz Voltage Noise
– 5.7-pA/√Hz Inverting Current Noise
– 0.8-pA/√Hz Noninverting Current Noise
• Low MTPR Distortion
– –74 dB with ADSL and ADSL2
– –71 dB with ADSL2+ and –70 dB with
ADSL2++
• –83 dBc THD (1 MHz, 100-Ω Differential)
• High Output Current: >410 mA (25-Ω Load)
• Wide Output Swing: 44 Vpp (±12-V, 200-Ω
Differential)
• Wide Bandwidth: 45 MHz (Gain = +5)
• Wide Power Supply Range: ±2.25 V to ±16.5 V
APPLICATIONS
• Ideal For Power Sensitive, High Density ADSL,
ADSL2, ADSL2+, and ADSL2++ Systems
CODEC
V _IN+
+12 V
+
−
4.99 kW
30.1 W
0.1 mF
DESCRIPTION
The THS6184 is a dual-port, low-power current
feedback differential line driver amplifier system ideal
for xDSL systems. Its extremely low-power dissi-
pation is ideal for ADSL, ADSL2, ADSL2+, and
ADSL2++ systems that must achieve high densities in
ADSL central office rack applications by combining
two ports, or four amplifiers, into one package.
The unique architecture of the THS6184 allows the
trimmed quiescent current to be much lower than
existing line drivers while still achieving high linearity.
Distortion at these low-power levels is good with –73
dBc THD at 1 MHz with the low bias mode of 4.3
mA/port. Fixed and variable multiple-bias settings of
the amplifiers allows for enhanced power savings for
line lengths where the full performance of the ampli-
fier is not required.
The wide output swing of 44-Vpp differentially with
±12-V power supplies coupled with over 410-mA
current drive allow for wide dynamic headroom,
keeping distortion minimized. The THS6184 output
stage incorporates extra catch-diodes to the power
supply to minimize the external protection required in
CO systems. With a low 2.9-nV/√Hz voltage noise
coupled with a low 5.7-pA/√Hz inverting current noise,
the THS6184 increases the sensitivity of the receive
signals allowing for better margins and reach.
Line Power = ADSL2: + 19.8 dBm
ADSL2+: + 20.4 dBm
ADSL2++: + 21.1 dBm
1:1
1.15 kW
0.1 mF
4.99 kW
1 mF
0.1 mF
33 nF
Line:
100 W
CODEC
V _IN−
−
+
−12 V
30.1 W
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-
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.
Copyright © 2005, Texas Instruments Incorporated